SKF Taconite Seals

One global design for split housings for extremely

contaminated and wet applications

Features Benefits
• Cartridge Taconite Seal of machined • Excellent exclusion of contaminants
cast iron or steel • Improved water ingress prevention
• Three and four axial labyrinth stages (including high pressure washing)
• Internal V-ring seal to exclude contami- • Longer bearing and seal service life
nants and enable grease to purge • Reduced grease consumption
• Rotating labyrinth ring faces bearing • Reduced environmental impact
housing to deflect and fling away water • Compact design
• Short installed axial length • Easier installation and alignment
• The rotating labyrinth ring is sealed to the • Compatible with new and older housings 1)
shaft by an O-ring in its bore
• 3 grub/set screws (at 120°) to center the
seal on the shaft
• ± 0.5° misalignment capability
• Circumferential groove to aid alignment
and assembly
• Fits SKF metric SE, SNL, SNL 30, 31 and
32 series 1)
• Fits SKF inch SAF, SAF B, SAW, SAFD and
SDAF housings 1)

1) Seals for shaft diameters, d1 ≥ 340 mm (12 15/16 in.) are “bolt on” design.
The housings must have a machined face to accommodate the seal.
 Superior protection and easier alignment
Heavy-duty industries The SKF Taconite Seal consists of two rings (one stationary and one rotating) which form a
• Mining very narrow labyrinth between the two rings. The rotating labyrinth ring carries a V-ring
• Mineral processing seal that seals against the stationary labyrinth ring. The V-ring seal blocks contaminants
• Cement from entering the bearing housing and aids the purging of contamination and old grease
• Pulp and Paper when the seal is re-greased.
• Metals
• Marine • Multi-stage axial labyrinth cartridge seal – includes two labyrinth rings, an internal low
friction V-ring seal and provision for grease purging
Typical applications • Purging and re-greasing of labyrinths – via a grease fitting on the stationary labyrinth ring
• Conveyor pulleys
• Flinger action – the rotating labyrinth ring flings water away from the seal
• Grinding mill pinion housings
• Bucket elevators • In-groove or bolt-on seal designs – for SKF split housings. Seals can be customized for
• Hoists and winches use with competitor housings
• Jack shafts • Compact, space-saving design – shorter axial width compared to other seals
• Pulverizers
• Inch or metric sizes – a wide product range to fit housings with different shaft sizes,
• Fans
from 50 mm (1 15/16 in.) to 450 mm (18 in.) as standard. Contact SKF if larger sizes
are needed.
• V-ring seal and O-rings – made of Acrylonitrile-butadiene rubber (NBR)
• Easy alignment – circumferential groove on the outer diameter surface of the stationary
labyrinth ring aids assembly and alignment. Grub/set screws in the rotating labyrinth ring
firmly secure it to the shaft.
• Worldwide availability – SKF can meet the needs of multinational producers and
just-in-time delivery programmes

Grease fittings for re-greasing

Safety warning
All rotating machinery requires
adequate fixed safety guards,
including the exposed rotating
labyrinth ring of SKF Taconite Seals.
If manual purging of the labyrinths is
used, provisions must be made for
the safe purge/re-greasing of the
labyrinths by extending the grease
supply fittings to the outside of the
safety guards.
For shaft diameters from 50–140 mm (1 15/16–5 7/16 in.) labyrinths "Bolt-on" SKF Taconite Seal has four labyrinth stages
have three stages; for shaft diameters 150 mm (5 15/16 in.) and larger,
labyrinths have four stages

Housing with SKF Taconite Seal – “in-groove” Housing with SKF Taconite Seal – "bolt-on" –
Fits into the seal groove of SKF split housings. The SKF housings do not optional for larger sizes
require modification to accommodate the new “in-groove” SKF Taconite The optional SKF Taconite Seal for larger sizes (from size 68) is flanged
Seal. “In-groove” seals have three or four stage labyrinths, depending for bolting to the housing. The SKF housing can be delivered from the
on size. factory with the necessary machining or, with existing housings, can
be modified by a local SKF Solution Factory to accommodate the
new SKF Taconite Seal in the larger sizes.

The ultimate SKF three-barrier solution

For optimum performance in extremely dirty and wet applications,
especially where high-pressure washdowns of the machinery are
common, SKF recommends the ultimate three-barrier solution:

• SKF housing with SKF Taconite Seals – primary barrier:

prevents ingress of solid and liquid contaminants, even during
high-pressure washdowns

• Grease barrier – secondary barrier: grease fill in bearing

housing cavity

• Upgraded sealed SKF Explorer spherical roller bearings –

final barrier: excludes contaminants during initial installation and
in operation
Grease filling and purging SKF Taconite Seal designation system and
The SKF Taconite Seal is supplied with a grease fitting for the selection guide
re-greasing of the labyrinth. This purges the labyrinth of
contamination and helps block the entrance of contaminants. All SKF Taconite Seals have the designation prefix TK. The seals can
be ordered in metric or inch dimensions. An SKF Taconite Seal can
The seal can be greased three ways: be ordered as an individual item for metric or inch dimensions or
• Manually with a grease gun as part of a kit with the SAF, SAF B, SAW, SAFD and SDAF inch
• SKF SYSTEM 24 housings. († table 1)
• SKF Automated Lubrication System (ALS) Designation for metric sizes consist of the prefix TK and the
housing size. Designation for inch sizes consists of prefix TK and
To fill and purge SKF Taconite Seals, the grease used to lubricate the number from table 1. For non-standard sizes, contact SKF
the bearing, or one that is compatible with it, should normally be application engineering service.
used. Where a sealed SKF spherical roller bearing is used, SKF
recommends SKF LGEP 2 grease, which is the original factory fill Examples for ordering SKF Taconite Seals only:
grease in sealed spherical roller bearings with VT143 suffix. Metric housing, adapter sleeve: TK.. eg. TK 524
For lubrication with SKF SYSTEM24, use LGWA 2 grease. Inch housing, adapter sleeve: TK.. eg. TK-115V

Depending on their compatibility with the grease used to lubricate

SKF Taconite Seals in inch sizes will be available starting end of 2015
the bearing, other SKF greases can also be used – according to
operating requirements:

• SKF LGHB 2 – higher ambient temperature applications

• SKF LGWM 1 – cold climates to -30 °C (-22 °F)
• SKF LGGB 2 – biodegradable grease
 Table 1

SKF Taconite Seal general data

D d

Metric sizes Inch sizes

Principal dimensions Designation1) Recommended Principal dimensions Designation2) Recommended
relubrication rate relubrication rate

d D b d D b

mm grams/hr in. grams/hr

50 125 40 TK 511 0,03 1 15/16 4.9 1.6 TK-24 V 0,03

55 130 40 TK 512 0,03 2 3/16 5.3 1.6 TK-29 V 0,03
60 135 40 TK 513 0,03 2 7/16 5.5 1.6 TK-37 V 0,03
65 140 40 TK 515 0,03 2 11/16 6.1 1.7 TK-44 V 0,04
70 155 43 TK 516 0,04 2 15/16 6.3 1.7 TK-184 V 0,04
75 160 43 TK 517 0,04 3 3/16 6.5 1.7 TK-188 V 0,04
80 165 44 TK 518 0,04 3 7/16 7.3 1.8 TK-79 V 0,05
85 180 45 TK 519 0,05 3 15/16 7.7 1.8 TK-109 V 0,05
90 185 45 TK 520 0,05 4 3/16 8.1 1.8 TK-113 V 0,05
100 195 45 TK 522 0,05 4 7/16 8.5 1.8 TK-117 V 0,06
110 205 45 TK 524 0,05 4 15/16 8.9 1.9 TK-122 V 0,06
115 215 45 TK 526 0,06 5 3/16 9.3 1.9 TK-125 V 0,07
125 225 47 TK 528 0,06 5 7/16 9.6 1.9 TK-130 V 0,07
135 235 47 TK 530 0,07 5 15/16 11 2.4 TK-140 V 0,09
140 245 47 TK 532 0,07 6 7/16 11.4 2.4 TK-148 V 0,11
150 280 60 TK 34 0,09 6 15/16 11.8 2.4 TK-155 V 0,11
160 290 60 TK 36 0,11 7 3/16 12.6 2.4 TK-159 V 0,15
170 300 60 TK 38 0,11 7 15/16 13.4 2.4 TK-167 V 0,16
180 320 60 TK 40 0,15 8 15/16 14.2 2.4 TK-552 V 0,17
200 340 60 TK 44 0,16 9 7/16 15 2.4 TK-553 V 0,18
220 360 60 TK 48 0,17 9 15/16 15.7 2.4 TK-607 V 0,19
240 380 60 TK 52 0,18 10 7/16 15.7 2.4 TK-973 V 0,19
260 400 60 TK 56 0,19 10 15/16 16.5 2.4 TK-858 V 0,21
280 420 60 TK 60 0,21 11 7/16 17.3 2.4 TK-861 V 0,21
300 440 60 TK 64 0,21 11 15/16 17.3 2.4 TK-859 V 0,21
320 440, 5103) 65 TK 68, TK 68B3) 0,33 12 7/16 20.1 2.6 TK 865 V 0,33
340 470, 5353) 65 TK 72, TK 72B3) 0,34 12 15/16 21.1 2.6 TK-869 V 0,34
360 490, 5553) 67 TK 76, TK 76B3) 0,36 13 7/16 21.1 2.6 TK-872 V 0,34
380 510, 5753) 67 TK 80, TK 80B3) 0,37 13 15/16 21.9 2.6 TK-875 V 0,36
400 530, 5753) 67 TK 84, TK 84B3) 0,37 15 22.6 2.6 TK-847 V 0,37
410 540, 6253) 70 TK 88, TK 88B3) 0,39 15 3/4 22.6 2.8 TK-969 V 0,37
430 565, 6353) 72 TK 92, TK 92B3) 0,39 16 1/2 24.6 2.8 TK-958 V 0,39
450 585, 6603) 72 TK 96, TK 96B3) 0,39 17 25 2.8 TK-838 V 0,39
18 26 2.8 TK-888 V 0,39

1) SE, SNL, SNL 30, 31 & 32

2) SAF, SAW, SAFD & SDAF
3) The higher D is valid for optional "Bolt-on" SKF Taconite Seal
Grease for lubrication To relubricate SKF Taconite Seals, SKF recommends using SKF LGEP 2 grease

Other compatible grease such as those listed below can also be used according to operating requirements
SKF LGHB 2 higher ambient temperature applications
SKF LGWM 1 cold climates to –30 °C (–22 °F)
SKF LGGB 2 biodegradable grease

For inch seals that are not shown in the table, go to www.SKF.com/group/products/bearing-units-housings/bearing-housings to find optional sizes.
Case Study 1 – Conveyor pulley Case Study 3 – Grinding mill pinion
Conveyor pulley bearings The non-drive end spherical
mounted in competitor split roller bearing on an ultra-fine
plummer block housings with grinding mill at a gold mine
taconite seals in an iron ore ship suffered failure every 15
loading facility were suffering months. Analysis showed the
regular premature failures with cause of failure to always be the
an MTBF* of only 12 months. same: water ingress into the
Investigation showed the cause to be gross iron contamination of housing. When the non-drive end bearing failed, both it and the
the bearing grease inside the housings with samples showing a drive side bearing were replaced as a precautionary measure,
content of 5 000 to 140 000 ppm. The existing seals were replaced increasing maintenance costs. The SKF ultimate three-barrier
with SKF Taconite Seals and the levels of contamination of the bearing solution (SKF housings, SKF Taconite Seals and upgraded sealed
grease inside the housings dropped dramatically. Samples taken at SKF Explorer spherical roller bearings) was installed in May of 2012.
6 months showed only 10 - 60 ppm of iron and bearing MTBF was The bearings are still in service with very satisfactory performance.
extended beyond that of the pulley lagging.

Case Study 2 – Conveyor pulley Case Study 4 – Conveyor pulley

Open spherical roller bearings Open spherical roller bearings
mounted in split plummer block mounted in competitor split
housings fitted with competitor plummer block housings with
taconite seals supporting taconite seals supporting
conveyor pulleys were suffering conveyor pulleys were suffering
premature failures with an premature failures with an
MTBF of approximately 18 MTBF between 3 and 12
months. Analysis showed the cause of failure to be extremely months. Analysis showed the cause of failure to be contamination of
contaminated bearing grease. The ultimate SKF three-barrier solution the bearing grease. Since the ultimate SKF three-barrier solution
(SKF housings, SKF Taconite Seals and upgraded sealed SKF Explorer (SKF housings, SKF Taconite Seals and upgraded sealed SKF
spherical roller bearings) was installed to address the problem. MTBF Explorer spherical roller bearings) was installed, there have been
is now expected to be in excess of 5 years. no further failures.

*MTBF – Mean Time Between Failure

The Power of Knowledge Engineering These competence areas include bearings and
Combining products, people, and application- units, seals, lubrication systems, mechatronics,
Seals
Bearings
and units
Lubrication
systems
specific knowledge, SKF delivers innovative and a wide range of services, from 3-D computer
solutions to equipment manufacturers and pro- modelling to cloud-based condition monitoring
duction facilities in every major industry world- and asset management services.
wide. Having expertise in multiple competence SKF’s global footprint provides SKF customers
Mechatronics Services
areas supports SKF Life Cycle Management, a with uniform quality standards and worldwide
proven approach to improving equipment reliabil- product availability. Our local presence provides
ity, optimizing operational and energy efficiency direct access to the experience, knowledge and
and reducing total cost of ownership. ingenuity of SKF people.

SKF BeyondZero is more than our climate strategy our customers the SKF BeyondZero portfolio of
for a sustainable environment: it is our mantra; a products and services with enhanced environ-
way of thinking, innovating and acting. mental performance characteristics.
For us, SKF BeyondZero means that we will For inclusion in the SKF BeyondZero portfolio,
® SKF and SKF SYSTEM 24 are registered trademarks of the SKF Group. reduce the negative environmental impact from a product, service or solution must deliver signifi-
© SKF Group 2015 our own operations and at the same time, increase cant environmental benefits without serious
The contents of this publication are the copyright of the publisher and maythe positive
not be environmental
reproduced contriprior
(even extracts) unless bution bypermis-
written offering environmental trade-offs.
sion is granted. Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be
accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein.
PUB BU/P2 15116 EN · February 2015
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