APPLICATIONS

Self-Locking Nut

Industry Co., Ltd.

 HARDLOCK Nut (HLN)
● Safety is Power! The Worlds Strongest Self-locking Nut!
● From Industrial Machinery, Mining Equipment to Bridges and Railways,
HARDLOCK NUT
　100% corresponding to the needs of a variety of fields.

The Globally Recognized HARDLOCK Nut

Utilizing the wedge principle used in ancient Japanese architecture, the HLN is the
ultimate self-locking nut which perfectly succeeds to integrate the nuts with the bolt.
[MAIN FEATURES]
■ Self-locking Effect Recognized by the World!
H ARDLOCK Nut also passed the
United States NAS (National Aerospace
Standard) Aviation Standards.
■ Enables Torque and Axial Force Control!
Controlling axial force with proper
torque wherever it is used.
■ Reusable!
 ll metal with little abrasion, sustains
A
a high self-locking effect.
■ Excellent and Simple Workability!
 asy installation with commercially
E
available tools.
■ Provides Substantial Cost Savings!
Allows significant reduction in total cost by
reducing maintenance costs, labor costs etc.

Self-locking Design
The design is based on the traditional Japanese "Wedge" principle!
HARDLOCK NUT consists of two nuts, the (1) nut
Principle 1 “Convex Nut”(fixing nut) has a truncated protrusion
Wedge arranged off-center on the upper part, the (2) nut
“Concave Nut”(locking nut) is designed with a
concentric conical depression for locking the two nuts
together. By tightening the concave nut onto the
convex nut, a strong perpendicular load will be applied
to the bolt from both sides.
Strike the wedge with a hammer
❷
❷

Source of the
a
locking effect!

Push the wedge with a nut ❶

Due to the strong locking force created by the Wedge of the

2 HARDLOCK NUT, no matter if it is exposed to severe
Integrate the wedge with the nut vibrations and/or impacts the HARDLOCK NUT will stay intact

1 Industry Co., Ltd.

Installation Procedure
1 2 3

Install the Convex Nut (Fixing Nut) to the fitting U s e a t i gh t e n i n g t o o l ( S p a n n e r , T o r q u e At this point, the Convex Nut has exactly the
member manually, by hand. Wrench etc.) to tighten the Convex Nut to the same strength as a general-purpose nut.
appropriate torque required for the application.

4 5 6

Install the Concave Nut onto the Convex Nut by Use a torque wrench to tighten the Concave Nut After installing, a gap may occur due to the bolts tolerance
hand. make sure that the space between the 2 to the torque value set by HARDLOCK Industry class. However, if tightened correctly by following the installation
nuts is about 1 thread pitch. Co., Ltd. Or about 1 turn with a spanner. procedure, the HLN will produce a sufficient locking effect.

Attention
Torque and Axial Force Control is only possible with the HARDLOCK Nut!
HARDLOCK Nut is not affected by external vibration impact whatsoever, and allows torque and axial
force control under very severe conditions.
The Concave Nut will completely lock the Convex nut in the state and maintain the torque and axial
force which it was initially installed with even if their value was low.　
① Superior Self-locking effect ② Torque & Axial force control ③ Re-usability. The ultimate self-locking
nut with these features is only the HARDLOCK Nut.

Testing
Impact Vibration Test Complying to NAS 3350/3354 Junker Test
TEST SAMPLE CONDITIONS 14
Spring washer + Single
Size nut
M12x1.75 20
Double nuts 30 No loosening
Material
Nylon nut SS400 60 Test aborted
12
Finish
Tongued washer +Trivalent
Single nut Chromate
90 VibraƟon Time
Split pin + Castle 40
Torque nut Nm 360 • Test Sample
1020 sec (17 10
HARDLOCK NUT 1300 Size : M10xP1.5
Bolt Clamp Load (kN)

min) Material : Low carbon Steel /

Vibration frequency 1,780c.p.m Class4
Loosening 8 Initial Preload : 13 kN
Vibration stroke 11mm Time
Impact stroke 19mm 360 sec • Vibration Strokes : ± 0.75 HARDLOCK NUT
Accelerated vibration 19.5Ga 6
Velocity : 20 Hz
Loosening Cycles : 1000 cycles Single nut (SN)
Loosening Loosening Time
Loosening 4
Time Time 90 sec Double nuts
Time
30 sec 60 sec
20 sec
2 Spring washer+SN
Spring washer Double nuts Nylon nut Tongued Split pin + HARDLOCK
Nylon nut
+ Single nut washer + Castle nut NUT
Single nut 0
0 200 400 600 800 1000

Number of Cycles

Total Cost Comparison (Certain Railway Company)

Cost ΈIndexΉ
5
3 year labor cost
4 2 year labor cost
3 1 year labor cost
2.45
2 1.6 Material cost
1.5
1 1
0
Single nut +
Single nut +
Plain washer Double nuts
Spring HARDLOCK
washer + NUT
Plain washer

Industry Co., Ltd. 2

 COMPANY OUTLINE

COMPANY NAME HARDLOCK INDUSTRY CO., LTD.

ESTABLISHED April, 1974

PAID IN CAPITAL JPY 10 million

ANNUAL TURNOVER JPY 1.5 billion

DIRECTOR Katsuhiko Wakabayashi

NUMBER OF EMPLOYEES 70

HEAD OFFICE 1-6-24, Kawamata, Higashi-Osaka, Osaka, Japan 577-0063

TOKYO BRANCH 3F, Higashi-Ueno Sanwa Building, 2-5-9, Higashi Ueno,

Taito, Japan 110-0015

OVERSEAS DISTRIBUTORS 6 countries

MAIN LINES OF BUSINESS Manufacture and sale of the self-locking products.

HLN : HARDLOCK NUT

HLB : HARDLOCK BEARING NUT
HLS : HARDLOCK SET SCREW
* All products patented

CERTIFICATE JIS Q9100 : 2009 (AS 9100)

ISO 9001 : 2008 (JIS Q 9001 : 2008)

MAIN USERS 【Domestic】

East Japan Railway Company
Central Japan Railway Company
West Japan Railway Company
Kawasaki Heavy Industries, Ltd.
Mitsubishi Heavy Industries, Ltd.
Hitachi, Ltd.
TOSHIBA CORPORATION
IHI Corporation
NIPPON STEEL ＆ SUMITOMO METAL CORPORATION
JFE Steel Corporation
Kobe Steel,Ltd.

【Overseas】
China Railway High-speed (China)
Network Rail (UK)
Taiwan High Speed Rail (Taiwan)
Queensland Rail (Australia)
Hyundai Rotem (Korea)
POSCO (Korea)
HOERBIGER (Austria)
Vale (Brasil)
Anglo American (Brasil)
Samarco (Brasil)

3 Industry Co., Ltd.

 COMPANY HISTORY

Apr. 1974 HARDLOCK Industry Co., Ltd. was established in Nagata, Joto-ku, Osaka.
Manufacturing and Sales of the HARDLOCK Nut was commenced.

Oct. 1980 A UK Market distributor for the HARDLOCK Industry Co., Ltd. was established.

Apr. 1985 The HARDLOCK Nut was adopted in the Tokaido Shinkansen 100-series cars.

Jun. 1992 HARDLOCK Industry Co., Ltd. was requested by Hitachi Ltd. to manufacture
HARDLOCK Nuts for adopting in their heavy electrical machinery in a certified
nuclear power plant.

Oct, 2000 Due to demands for the HARDLOCK Nut overseas, the foreign trade department
was established.

Mar. 2003 4 million units of HARDLOCK Nut was adopted in various locations in the
Taiwan high-speed rail.

Sept. 2003 Distributor for the Korean market was established in Seoul.

Oct. 2003 HARDLOCK Industry Co., Ltd. acquired certification for rail tracks in the UK
railway of Network Rail.

Nov. 2003 Acquired certification ISO9001: 2000 from the German Organization TÜV.

Dec. 2003 Acquired certification for railway in Queensland and Victoria, Australia.
(Certification Number : C0054)

Jul. 2005 Announce research thesis on HARDLOCK Nut locking effect at ASME PVP 2005.

Dec. 2006 BBC channel 1 introduces the effectiveness of HARDLOCK Nut loosening in a program
on railway accidents, leading to increased use in the railway industry.

Sept. 2011 Received JISQ 9100 : 2009 certification for Quality Management Systems
in the aerospace and defense industries.

Mar. 2014 The HARDLOCK Nut was officially adopted by Vale S.A. in Brasil to increase safety and
workability in the Mining and Earth Moving industry.

Kings Place 90 York Way

London
N1 9AG
Tel: +44 (0) 207 557 9283
Fax:+44 (0) 207 557 9131

Michael Moore
Staytite Limited
Staytite House
Coronation Road
Cressex Business Park
High Wycombe
HP12 3RP

11th September 2008

Dear Michael

Re: M20 Hardlock Nuts for Fixed Stretcher Bars

In July 2008 Network Rail identified Hardlock nuts as a high performance fastening system
to be used on revised full depth stretcher bars which will be used extensively throughout the
UK rail network. This has followed on from the successful use of M30 Hardlock nuts on
adjustable stretcher bars which have been in widespread use since October 2003.

Staytite Limited worked with Network Rail to advise, design and supply a modified
Hardlock nut to meet our requirements.

The revised specification of this new M20 Hardlock nut required a taller, inner, male nut to
better accommodate standards tools without the risk of slipping and rounding the corners
of nuts in restricted locations such as a connection through the web of a switch rail. This was
also important if components subsequently had to be dismantled during routine
maintenance allowing the inner, male nut to be securely held while removing the outer,
female nut without risk of damage. The outer female nut was also modified to incorporate a
small flange on the underside of the nut to prevent a socket when applied to this outer nut
from accidentally engaging with the inner male nut ensuring that the required torque can be
easily applied to the outer female nut during installation.

Staytite provided advice and guidance in a prompt and professional way enabling the
selection of a revised fastening system to be progressed within set timescales to the
satisfaction of all parties involved.

Yours sincerely

Brian Whitney

Principal Rail Management Engineer

Network Rail

Network Rail Infrastructure Ltd Registered Office Kings Place 90 York Way London N1 9AG Registered in England and Wales No. 2904587 www.networkrail.co.uk

Industry Co., Ltd. 4

  A P P L I C AT I O N S

1 ENERGY / POWER


[MAIN APPLICATIONS]
◦Wind Power
　Power Generator・Decelerator 
Cable Racks in Turbine Towers Etc.
◦Solar Power
　Solar Panel Mounting Etc.
◦Thermal Power Generation
　Desulfurization Equipment
Hopper Liner Stops・Bucket Conveyors Etc.
◦Nuclear Power
　Power Plant Instrumentation・Piping
Reactor Filtration Machine
Nuclear Reactor Control Mounting Etc.

Wind Turbine Tower

Wind Turbine Tower Internal Piping

Thermal Power Plant

Dam

Solar Panel Mounting Solar Power

Nuclear Power Plant Piping in Power Plant

5 Industry Co., Ltd.

 A P P L I C AT I O N S

2 
MINING & EARTH MOVING

【MAIN APPLICATIONS】
◦Processing Machinery
　Vibrating Screen
Breaker
Conveyer System
Grid Car
◦Heavy Machinery
　Off-Road Truck
Dozer
Bucket Wheel Excavator
◦Freight Railway
　Wagon
Wagon Rotator
Fishplate
Crossing

Pendulum securing

Coupling fastening

Caterpillar treads securing

Bucket securing Tire securing

Industry Co., Ltd. 6

  A P P L I C AT I O N S

3 RAILWAY (ROLLING STOCK)



[MAIN APPLICATIONS]
◦Shinkansen (Bullet Train) /
Conventional Trains / Monorail
　Various Equipment Mounting for Trains
Various Control Device Mounting
Bearing Box
Tight Coupler
Disc Break
Drive Unit Coupling Portion
Suspension / Hydraulic Damper Portion
Automatic Door Unit Etc.

Shinkansen E5 Series (Bullet Train)

Taiwan Shinkansen 700T (Bullet Train) UK Express 395 Series

Shinkansen N700 (Bullet Train) New Transport System

Tight Coupler Bearing Box

Shinkansen Equipment Mounting

Various Mounting for Carriage Section Disc Break

7 Industry Co., Ltd.

 A P P L I C AT I O N S

4 
RAILWAY (INFRASTRUCTURE)

[MAIN APPLICATIONS]
◦Railway (Power) ◦Railway (Track)
　Steel Column Flange Stop 　Rail Joint / Insulation Seam Bolt
Stationary Beam 　Splinter with Various Bolts
Overhead Line Bracket・Band 　Rail Fastening Device 
Etc. 　Derailment Prevention Guard 
◦Railway (Signal) 　Etc.
　Automatic Train Stop (ATS) ◦Railway (Construction)
Impedance Bond 　Railway Station Equipment
Railroad Switch Moving Portion 　Station Building Roof 
Control Equipment Box in Terminal 　Shinkansen / Conventional
Etc. Line Soundproof Wall Etc.

Steel Column Flange Stop Beam and Movable Bracket Band Stop Automatic Train Stop (ATS)

Impedance Bond Terminal Attachment Derailment Preventive Guard

Rail Joint Fish Plate Railroad Switch Moving Portion

Industry Co., Ltd. 8

  A P P L I C AT I O N S

5 BRIDGE


[MAIN APPLICATIONS]
　Bridge Ancillary Equipment Joint Portion
　Piping Flange Portion
　Inspection Passage
　Long-span Bridge Illumination Equipment 
　Maintenance Vehicle Equipment for Inspection
　Information Board
　Pedestrian Bridge
　Falling Objects Prevention Equipment
　General Road Equipment

Water Supply Plumbing (Akashi Kaikyo Bridge)

Long-span Bridge Ancillary Equipment Joint Long-span Bridge Road Equipment

9 Industry Co., Ltd.

 A P P L I C AT I O N S

6 
HIGHWAY

[MAIN APPLICATIONS]
　Road Joints
Soundproof Wall Joint
Sound-absorbing Panels 
Illuminating Equipment and Base Plate
Direction Board 
Jet Fan in Tunnels
Grating Joint
Guard Rail Joint
ETC (Electronic Toll Collection) Board・Information Board
Storm Drain Cover Securing

Various Soundproof Walls

Lighting Columns Anchor Portion (Metropolitan Expressway)

Aluminum Highway Fence (Second Tomei Expressway) Sound-Absorbing Panels

Industry Co., Ltd. 10

  A P P L I C AT I O N S

7 VEHICLES


[MAIN APPLICATIONS]
◦Specially Equipped ◦Amusement Ride
Vehicle 　Roller Coaster Wheel Axis
　Engine Transmission Rail Joint
Damper & Trunnion Coaster Sheet Joint
Frame Bracket Mounting  ◦Transport Equipment
Etc.
　Forklift Wheel Axis Portion
◦Buggy Etc.
　Wheel Axle Sprocket Stopper 
Engine starter Etc.
◦Ship
　Internal Combustion Engine System
Inboard Hydraulic Tube Flange
Etc.
Specially Equipped Vehicle

Frame Mounting

Sprocket Stopper

Buggy

Ship Engine LNG Ship

Concrete Pump Truck

Guide Roller Wheel Axis Stopper Forklift

11 Industry Co., Ltd.

 A P P L I C AT I O N S

8 MACHINERY


[MAIN APPLICATIONS]
　Cement Mill (Liner Stopper) 
Concrete Mixer (Decelerator)
Power Cylinder (Drive Shaft Stopper)
Excavator (Drill Drive Shaft Stopper) 
Rock Drilling Machine (Hydraulic Breaker Stopper) 
Agitator (Impeller Stopper)
Large Hydraulic Press (Cylinder Unit, Etc.)
Compressor (Axis Stopper) 
Pump (Impeller Stopper)
Tapping Machine (Ball Screw)
Injection Molding Machine
Steel Making Machinery 
(Straightening Roll Stopper) 
Conveyor Rollers 
Industrial Robot Arm Portion
Die-casting Machine 
(Core Pin Stopper)
Etc.

Injection Molding Machine

Steel Making Machinery (Straightening Roll Stopper)

ライナー止め

Excavator

Cement Mill
Hydraulic Breaker Tie Rod Stopper

Compressor Pump Impeller Stopper

Industry Co., Ltd. 12

  A P P L I C AT I O N S

9 Construction


[MAIN APPLICATIONS]
　High-rise Building Bonding Portion
High-rise Building Ancillary Equipment
High-rise Building Curtain Wall Portion
Exterior Wall (Panel) Mounting
Turnbuckle
Dome Steel Frame Joint
Stone Wall Pitching 
Facility Roofing
Top Light Fastening
Sanitation & Electrical Equipment Etc.

High-Rise Building Exterior Wall & Curtain Wall Tokyo Sky Tree

Metal Frame Joint

Yurikamome Station Roof Osaka Station Renewal

13 Industry Co., Ltd.

 A P P L I C AT I O N S

10
[MAIN APPLICATIONS]
PYLONS


◦Communication Towers
　Steel Tower Connecting Portion
General Ancillary Equipment
Digital Frame Mounting
Etc.
◦Transmission Tower
　Steel Tower Connection Portion
Pipe Jumper Part
Insulators Fastening Portion
Etc.

Transmission Tower Communication Tower

Joint (Angle/Pipe) Joint (Angle/Pipe)

Transmission Line Tower Pipe Jumper

Communication Tower Digital Frame Portion

Industry Co., Ltd. 14

 Improvement Case PRODUCTS

1. Car & Motorcycle 2. Specially Equipped Vehicle

▲Engine Transmission ▲Trunnion Portion

SUV Specially equipped

HLN HLB
Engine Transmission vehicle trunnion fixing
Before Before
●Double bearing nuts were used as a countermeasure
●F langed Nuts were utilized in the engine trans-
for loosening
missions of SUVs
●T he double bearing nuts were tightened by the
●Loosening of nuts occurred frequently when starting
“double nut method” . However, loosening occurred
the engine and many SUVs had to be recalled.
due to the variation in tightening force.

After After
●B y switching from Flanged Nuts to HARDLOCK ●B y adopting the HARDLOCK Bearing Nut, the
Nuts the loosening problem was resolved. workability was improved and the loosening problem
●B y u t i l i z i n g H A R D L O C K N u t t h e l o o s e n i n g was solved.
occurring when starting the engine were also ●By switching to HARDLOCK Nut, the maintenance
resolved. costs were significantly reduced

Major Loosening Cause Major Loosening Cause

●Loosening due to cyclic ●Loosening due to cyclic

stress in the rotational stress in the rotational
direction of the bolts axis direction of the bolt axis

15 Industry Co., Ltd.

Improvement Case PRODUCTS

3. Cagriculture
 onstruction machinery and
machinery 4. Robot

▲Hydraulic Breaker Industrial Robot▲

Industrial Robot
HLN Hydraulic Breaker HLB
Arm Joint
Before Before
●Prevailing torque type self-locking nuts where used were
●Loosening caused by severe impact vibration from
in the arm portion, but iron powder produced by the
crushing operations at mines and large quarries
friction between the nut and shaft caused poor movability.
occurred on a regular basis. Double nuts were used
and carried out a high-torque fastening and dropout ●Torque control was difficult with prevailing torque
type self-locking nuts and there was a problem with
prevention measures, but the problem was not solved.
variety in axial force.

After After
●B y switching to HARDLOCK Bearing Nut the
●B y introducing HARDLOCK Nut, axial force problem with shaft damage was resolved.
management by proper torque and loosening ●Axial force management by proper torque combined
prevention was achieved with elimination of loosening improved the product
performance of the industrial robots.

Major Loosening Cause Major Loosening Cause

●Loosening due to cyclic stress ●Loosening due to cyclic

in the direction perpendicular stress in the rotational
of the bolts axis direction of the bolt axis

Industry Co., Ltd. 16

 Improvement Case PRODUCTS

5. Conveyance Equipment 6. Iron & Steel

▲Rail Fastening Portion ▲Mill Roll

Indoor Overhead / Steelwork

HLN HLB
Bridge Cranes Equipment Lines
Before Before
●P revailing torque nuts where used for indoor ●To prevent loosening at steelwork equipment lines, the
overhead cranes. However, due to excessive shafts has key grooves and is fastened with both toothed
vibration loads they became loose on a regular basis. washers and nuts as well as welding in some instances.
●In recent years, steelwork facilities are continuing
●Due to the everyday loosening, re-tightening works with a fire-free work environment. Therefore, welding
etc., maintenance cost was increased immensely. and such other procedures have been minimalized.

After After
●When using HARDLOCK Bearing nuts, it eliminates the
●By changing to HARDLOCK Nuts, loosening in the need to use toothed washers, key grooves and welding
fastening portions of the cranes was eliminated. procedures, significantly improving the workability.
●A s a result, stable operations and reduction in ●Eliminating the need for welding procedures, the
maintenance work lead to significant cost savings. HARDLOCK products creates a safe, fire-free work
environment.

Major Loosening Cause Major Loosening Causes

●Loosening due to cyclic ●Loosening due to cyclic stress in the

rotational direction of the bolt axis
stress in the direction
●Loosening due to cyclic stress in the
perpendicular of the bolt axis direction perpendicular of the bolt axis

17 Industry Co., Ltd.

Improvement Case PRODUCTS

7. Industrial machinery 8. Fluid Equipment

▲Die-cast Machine ◀Impeller

Die-Casting Core
HLS HLN Impeller Pump
Pin Stopper
Before Before
●Conventionally, spot welding, bolt fastening method of ●Vibration in the pump due to high speed rotation in
plates and nesting method were used to prevent the the impeller shaft cased loosening.
core pin to recede from the pressure during molding. ●Castellated nuts and other self-locking components
●Reduced die strength and work time was a problem with were used, but this did not completely resolve
the conventional pin retraction prevention measures. loosening.

After After
●B y switching to HARDLOCK Set Screw, preventing ●A fter switching to HARDLOCK Nut vibration
retraction of the core pin was achieved by only tightening loosening due to high speed rotation was completely
the HARDLOCK Set Screw, no other measurements were eliminated, as well as significant decrease in
necessary. It also contributed to reduce molding costs.
periodic maintenance costs.
●Prior to switching to HARDLOCK Set Screws it took more than 12
hours to replace the core pin, but after switching to HARDLOCK ●Switching to HARDLOCK Nut also prolonged the
Set Screw, the same work was reduced to approximately 3 hours. product life.

Major Loosening Cause Major Loosening Cause

●Loosening due to cyclic ●Loosening due to cyclic

stress in the direction of stress in the rotational
the bolt axis direction of the bolt axis

Industry Co., Ltd. 18

 Improvement Case PRODUCTS

9. Heavy Electrical Plant 10. Watercraft

▼Piping Support ▼Ship Engine

Nuclear Power Ship Internal

HLN HLN
Plant Reactor Core Combustion Engine
Before Before
●Double nuts were used in the fixed stand of the ●Double nuts where used on the internal combustion
reactor core and piping supports in the power plant. engines of the ship, loosening due to thermal expansion
Retightening work and maintenance were required and severe vibration occurred on a daily basis.
on a daily basis due to frequent loosening.
●Since nuclear power plants are large in size and places ●Retightening work had to be made frequently and
where nuts are used are plenty, huge amounts of an enormous amount of time and cost was spent
maintenance cost and maintenance time was necessary. on maintenance.

After After
●HARDLOCK Nut demonstrated superior self-locking ●B y switching to HARDLOCK Nut with special
performance and prevention of loosening. coating, Loosening due to vibration and/or thermal
●S afety in the nuclear power plant facilities expansion was eliminated.
increased, time spent on maintenance and ●Significant reduction in maintenance cost as well
maintenance cost was reduced immensely. as retightening work.

Major Loosening Causes Major Loosening Causes

●Loosening due to micro-motion ●Loosening due to micro-motion abrasion

abrasion ●Loosening due to cyclic stress in the
●Loosening due to thermal direction perpendicular to the bolt axis
causes ●Loosening due to thermal expansion

19 Industry Co., Ltd.

Improvement Case PRODUCTS

11. Highway / Roads 12. Bridge　

▲Road Plates

◀Pier Cover Plate

Mounting

Road Plates D Runway expansion

HLN HLN
Fastening Portion D Runway Expansion
Before Before
●Countermeasures such as welding and insertion of cushioning ●During the construction of the titanium panel on
materials to reduce vibration in the road plates were carried artificial grounds rear surface of the offshore airport,
out. However, due to poor welding and replacement of prevailing torque self-locking nuts were studied.
cushioning material work, both options were unsatisfactory. ●Since the prevailing torque type self-locking nuts caused scratches on
●A nother serious problem was the noise control due to the bolt (peeling off the plating), rust occurrence was a serious problem
collision of the road plats when vehicles passed over them. and concerns regarding safety and corrosion resistance arose.

After After
●By switching to HARDLOCK Nut in the connection ●B y switching from prevailing torque type self-locking nuts to HARDLOCK
portion of the road plates, problems such as loosening Nuts, problems related to bolt damage and corrosion were eliminated.
were eliminated. ●Loosening due to severe vibration in the pier cover plates
●A dditionally, the noise generated when vehicles during landing and take-off of aircrafts were eliminated,
pass over the road plates was eliminated and HARDLOCK Nut also corresponded to the 100 year warranty
overall costs were reduced. requested by the Ministry of Land, Infrastructure and Transport.

Major Loosening Cause Improvement Case

●Loosening due to cyclic ●Loosening due to micro-motion

abrasion
stress in the direction
●Loosening due to cyclic stress
perpendicular to the bolt axis in the direction of the bolt axis

Industry Co., Ltd. 20

 Improvement Case PRODUCTS

13. Architecture

and
Construction Equipment 14. Electrical Equipment

◀Exterior Wall ◀Distribution Boards

Mounting

Exterior Wall of
HLN HLN Distribution Board
High-rise Buildings
Before Before
●A luminum curtain walls where mounted on the ●Double nuts or spring washer were used, loosening
exterior walls of high-rise buildings with metallic due to vibration caused during product transportation
fastener, but due to the high torque required to was a regular occurrence.
tighten the metallic fasteners, it caused expansion of ●Loosening after installation due to micro-vibration
the aluminum which would cause a specific sound. during operation occurred on a daily basis.

After After
●B y switching to HARDLOCK Nut, due to proper
●By switching to HARDLOCK Nut, axial force control torque control, loosening during transportation and/
due to proper torque was achieved and the sound or operation was eliminated.
phenomenon was eliminated. ●Significant savings in labor was achieved due to
eliminating re-tightening work.

Major Loosening Causes Major Loosening Cause

●Loosening due to cyclic stress

in the direction perpendicular ●Loosening due to micro-motion
to the bolts axis abrasion
●Loosening due to thermal causes

21 Industry Co., Ltd.

 Improvement Case PRODUCTS

17. Playground
 / Amusement
Park Equipment 18. Railway（1）

▼Shinkansen Tight Coupler

▲Guide Roller Portion

Roller Coaster Shinkansen (Bullet Train)

HLB HLN
Wheel Axis Stopper Tight Coupler
Before Before
●R oller coasters and many other attractions use
●In high speed rail cars, repeated impact of the rail
double nuts or split pins for their application.
coupling causes the nut to loosen and may even risk
However, due to the hole in the shaft required for
detachment. Damage to friction ring also causes the
the split pin, the shafts strength is reduced and
nut to loosen.
could end up breaking.

After After
●By switching to HARDLOCK Nut, due to successful ●By using the HARDLOCK Nut, even under repeated
axial force control the maintenance cost was impact, loosening is prevented and detachment does
reduced significantly. not occur. Breakage of the friction ring is eliminated
●Additionally, no hole was required in the shaft and by using the HARDLOCK Nut and has been adopted
the problem with weaken shaft was eliminated. by many rail car manufacturers.

Major Loosening Causes Major Loosening Causes

●Loosening due to cyclic stress in the ●Loosening due to cyclic stress in the
rotational direction of the bolt axis direction of the bolt axis
●Loosening due to cyclic stress in ●Loosening due to cyclic stress in the
the direction of the bolt axis direction perpendicular of the bolt axis

23 Industry Co., Ltd.

 Improvement Case PRODUCTS

17. Playground
 / Amusement
Park Equipment 18. Railway（1）

▼Shinkansen Tight Coupler

▲Guide Roller Portion

Roller Coaster Shinkansen (Bullet Train)

HLB HLN
Wheel Axis Stopper Tight Coupler
Before Before
●R oller coasters and many other attractions use
●In high speed rail cars, repeated impact of the rail
double nuts or split pins for their application.
coupling causes the nut to loosen and may even risk
However, due to the hole in the shaft required for
detachment. Damage to friction ring also causes the
the split pin, the shafts strength is reduced and
nut to loosen.
could end up breaking.

After After
●By switching to HARDLOCK Nut, due to successful ●By using the HARDLOCK Nut, even under repeated
axial force control the maintenance cost was impact, loosening is prevented and detachment does
reduced significantly. not occur. Breakage of the friction ring is eliminated
●Additionally, no hole was required in the shaft and by using the HARDLOCK Nut and has been adopted
the problem with weaken shaft was eliminated. by many rail car manufacturers.

Major Loosening Causes Major Loosening Causes

●Loosening due to cyclic stress in the ●Loosening due to cyclic stress in the
rotational direction of the bolt axis direction of the bolt axis
●Loosening due to cyclic stress in ●Loosening due to cyclic stress in the
the direction of the bolt axis direction perpendicular of the bolt axis

23 Industry Co., Ltd.

Improvement Case PRODUCTS

19. Railway（2） 20. Detached Housing

▲Railroad Switch

▲Steel Frame joint

Railroad Switch Light-gauge steel frame

HLN HLN
Switch Adjuster joints for Detached housing
Before Before
●When a train passes, a force of 500G is applied to the
switch, and even specially shaped double nuts used on ●C onventionally, based on the Building Standards
the movable parts can become loose on a daily basis. Law, Single Nuts and Spring Washers was going
●While the switch (movable part) is essential to maintain to be used in the Light-gauge Steel Joint as a
the track gauge, it is extremely difficult to maintain the countermeasure for loosening.
gauge of the track while preventing loosening.

After After
●By using the HARDLOCK Nut, the maintenance cost associated
with inspection and re-tightening was successfully reduced. ●A f t e r t h e G r e a t E a s t J a p a n E a r t h q u a k e i n
●The HARDLOCK Nut successfully maintained the gauge 2011, the HARDLOCK Nut usage increased
of the track and prevents loosening simultaneously. As a significantly in the Smart House Building Frame
result, the HARDLOCK Nut has been adopted by all railway Joints to further improve safety
companies in Japan.

Major Loosening Causes Major Loosening Causes

●Loosening due to cyclic stress in the ●Loosening due to cyclic stress in the
direction of the bolt axis direction of the bolt axis
●Loosening due to cyclic stress in the ●Loosening due to cyclic stress in the
direction perpendicular of the bolt axis direction perpendicular of the bolt axis

Industry Co., Ltd. 24

 Improvement Case PRODUCTS

21. MINING EQUIPMENT

Pendulum Fastening for Vibration Screens

Before
●Conventinally, General Hex Nuts were used for fastening the Pendulum portion on the Vibration Screens.
●However, due to severe vibration, re-torquing work was performed at least once every 45 days.

After
●By switching to HARDLOCK Nut, re-torquing work was reduced to only once in over a years time.
●The plants operating rate and productivity was dramatically improved, along with a significant reduction in maintenance
and labor costs

Major Loosening Cause

●Loosening due to cyclic stress in the direction perpendicular of the

bolts axis

25 Industry Co., Ltd.

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Presentation for Aviation Affiliated Companies in

Seattle, USA

JIS Q 9100 Certification "Quality Management Visit at the Boeing 787 Gallery
Systems - Requirements for Organization in
Aerospace and Defense Sector"

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Safety is Power

Industry Co., Ltd.

Head Office : 1-6-24, Kawamata, Higashi-Osaka, Osaka, Japan 577-0063
TEL : +81-6-6784-1131 FAX : +81-6-6784-1161
Tokyo Office : 2-5-9, Higashi-Ueno, Taito, Tokyo, Japan 110-0015
TEL : +81-3-3833-1491 FAX : +81-3-3833-1438
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