ASME B18!3!6M 1986 Metric Series Socket Set Screws
ASME B18!3!6M 1986 Metric Series Socket Set Screws
ASME B18!3!6M 1986 Metric Series Socket Set Screws
com
nystandards
.a
w
w
w
/
:/
p
t
t
h
A AN M E R I C A NN A T I O N ASLT A N D A R D
SPONSORED A N D P U B L I S H E D B Y
OF
T H EA M E R I C A NS O C I E T Y
United Engineering Center
M E C H A N I C A LE N G I N E E R S
3 4 5 East 47th
Street
New
York,
N. Y. 1001 7
rds.com
nystanda
.a
w
w
w
/
:/
p
t
t
h
This Standard will be revised when the Society approves the issuanceof a new edition.
There will be no addenda or written interpretations of the requirements of this Standard
issued to this Edition.
This code or standard was developed under procedures accredited as meeting the criteria for
American National Standards. The Consensus Committee that approved the codeor standard was
balanced t o assure that individuals from competent and concerned interests haveanhad
opportunity
to participate. The proposed code or standard was made available for public review and comment
whichprovides an opportunityforadditionalpublicinputfromindustry,
academia, regulatory
agencies, and the public-at-large.
ASME does not "approve," "rate," or "endorse" any item, construction, proprietary device, or
activity.
ASME does not take any position with respect to the validity of any patent rights asserted in
connection with any items mentioned in this document, and
does not undertake t o insure anyone
utilizing a standard
against liability for infringement of
any applicable Letters Patent, nor assume any
such liability. Usersof a codeor standard are expressly advised that determination of the validity of
any such patent rights,
and the riskof infringement of such rights, is entirely their own responsibility.
Participation by federal agency representativek)or person(s) affiliated with industry is not to
be
interpreted as government or industry endorsement of this codeor standard.
ASME accepts responsibility for only those interpretations issued in accordance with governing
ASMEproceduresandpolicieswhichprecludetheissuance
of interpretations by individual
volunteers.
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
FOREWORD
(This Foreword is not part of ASME/ANSI B18.3.6M-1986.)
iii
ards.com
nystand
.a
w
w
w
/
:/
p
t
t
h
iv
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
OFFICERS
J. B. Levy, Chairman
H. W. Ellison, Vice Chairman
E. Schwartz. Vice Chairman
R. W. McGinnis, Secretary
COMMITTEE PERSONNEL
AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS
E. R. Friesth, Don E. Williams Co., Rock Island, Illinois
AMERICAN SOCIETY OF MECHANICAL ENGINEERS
A. R. Machell, Webster, New York
K. E. McCullough, SPS Technologies Inc., Jenkintown, Pennsylvania
ards.com
nystand
.a
w
w
w
/
:/
p
t
t
h
PERSONNEL OF SUBCOMMITTEE 3
vi
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
CONTENTS
Foreword ...............................................................
StandardsCommitteeRaster
...............................................
iii
v
General ............................................................
Dimensional Characteristics ..........................................
Materials. Processing. and Mechanical Properties. .......................
1
2
Figure
..................................................
Tables
3
4
5
Appendices
I
I1
I11
vii
4
5
6
7
8
11
12
15
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
ASME/ANSI B18.3.6M-I986
fications, when such plating or modificationis not accomplished under his control or direction.
1 GENERAL
1 .I Scope
1.I .I
This Standard contains
complete general and
dimensional requirements for metric series socket set
screws ofnominal sizes from 1.6 mm to 24 mm recognized as American National Standard. Also included
are appendices covering formulas fordimensions (Appendix I), part numbering system and preferred sizes
for government use (Appendix 11), and threaddimensions (Appendix 111).
1.6 Terminology
1.7 Designation
Metric socket set screws conforming to this Standard shall be designated by the following data in the
sequence shown:
(a) Specification (ASME/ANSI document) number followed by a dash;
(b) Nominal size of screw;
(c) Thread pitch, preceded by X ;
(6)Nominal screw length, preceded by x ;
(e) Drive;Unlessspecifiedotherwise,hexagon
socket will be supplied.
u> Point style and product name. Product- name
may be abbreviated SS. Point may be pt.
(g) Material and property class. Alloy steel screws
shall be as specified in ASTM F 912M. Corrosionresistant steel screws shall be as specified in ASTM F
880M (see para. 3.1).
(h) Protective finish, if required (see para. 3.1).
Examples:
Socket set screws produced to this Standard will interchange functionally with screws conforming to the
dimensions presently documented in international
standards on hexagonsocket set screws with flat
point, cone point, dog point, and cup Ipoint:
S 0 4026,
I S 0 4027, I S 0 4028, and I S 0 4029-1977, respectively.
1.3 Dimensions
All dimensions in this Standard are given in millimeters (mm) and apply before plating unless stated
otherwise.
1.4 Options
Number
I \
Drive,
or Name,Abbreviation
t;:.pq
B18.3.6M-6 x 1 x SHexSocketCupPointSocketSetScrew,
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
ASME/ANSI B18.3.6M-1986
For users who need a definitive part numbering system, one is suggested in Appendix 11.
2 DIMENSIONAL CHARACTERISTICS
The following requirements supplement the dimensional data presented in Tables 1, 2, and 3 and shall
apply to the respective features of set screws.
FIG. 1
SOCKETEDGE DETAIL
2.1 Face
2.2 Sockets
2.2.1 Socket Size. Hexagon sockets shall be of
nominal size Jspecified in Table ,and
1 shall conform
to the dimensions given in Table 3, with gaging in accordance with para. 2.2.3.
Spline sockets shall be of nominal size M a s specified in Table 1, and shall conform to the dimensions
given in Table 4,with gaging in accordance with para.
2.2.3.
2.2.2 Key Engagement. For screws of nominal
lengths exceeding those listed in Table ,the
1 minimum
key engagement T for thelongest length shown shall
apply. They represent the minimum key engagement
depth necessary to develop the full functional capability ofkeys conforming to ANSI B18.3.2M7 Metric
Series Hexagon Keys and Bits.Compliancewith
minimum depth requirements shall be determined by
gaging in accordance with para. 2.2.3.
ards.com
nystand
.a
w
w
w
/
:/
p
t
t
h
ASMElANSl 818.3.6M-1986
Point (Table 2)
Nominal
Size
or Basic
Screw
Diameter
1.6
Thread
Pitch
0.35
'exagor
Socket
Size
Nom.
0.7
2.5
0.4
0.45
Spline
Socket
Size
Nom.
Cup and
Fiat
Points
Nominal
Screw
Lengths
0.5
0.7
1.3
1.5
See
para.
0.8
-spi.
iex
Hex.
Spl.
Ts
Th
Ts
Th
Th
Min.
-#in.
Min
- --
0.84
0.84
1.22
3.6
3.8
1 .o
1.25
0.6
1.5
2
2.5
3
4
3.6
0.6
0.7
0.7
2
2.5
0.7
1.1
1.5
1.8
--
1.52
2
2.5
3
4
Min.
Spl.
Ts
Min.
Min.
.. .
Nominal
Size
or Basic
Screw
Diameter
Thread
Pitch
Hexagon
Socket
Size
Spline
Socket
Size
Nom.
Nom.
Nominal
Screw
Lengths
0.9
2.5
2.2.1
Cone and
Hex.
1.5
2
2.5
3
T
Minimum Key Engagement
2.44
2.5
3
4
5
6
0.8
1.o
1.2
1.5
2.82
1.8
I .o
i .2!
--
0.7
0.7
1.6
1.8
1 .O
1.2
1.5
-0.7
1.o
1.o
1.o
3.7
1.o
1.3
1.8
- -0.6
1.1
1.5
2.1
2.1
0.6
1.1
1.2
1.2
1.2
3.7
1.o
1.5
2.1
0.6
0.7 0.6
0.7 0.7
1.25
0.7
0.6
0.7
0.7
0.7
1.2
1.5
0.7
0.6
0.7
0.7
1.3
1.8
2.3
2.3
1.2
2.0
2.7
2.7
2.7
1.3
1.8
2.0
2.o
1.2
2.o
2.3
2.3
2.3
- -
2.2.1
1.0
1.5
2.0
2.3
0.7
0.7
0.7
0.6
. ...
0.9
1.o
1.o
... . . .
.. .
2.1
1.0
1.0
1.5
1.5
2.0 2.0
2.0 2.3
._ .
1.25
1.75
16
20
2.5
10
12
Hex.
Th
Ts
Th
Ts
Th
bin. Min.
4
5
6
8
1.8
1.8
2.5 2.5
3.0
3.0
3.0 3.0
1.8
8
10
Win.
Min. Min.
Spl.
Ts
Win.
. . . . . . . . . ...
...
...
...
4.0
4.0
5.49
6
8
10
12
2.0
3.6
5.0
5.0
2.0
3.6
5.0
5.0
6.38
8
10
12
16
3.0
4.5
6.0
3.0
4.5
6.0
6.0
10
12
16
20
3.0
4.8
8.0
3.0
4.8
8.0
8.0
9.45
11.53
15.1 1
-- 2.2.1
Spl.
1.8 . . .
2.3
2.5 2.5
4.0
3.5
4.0
4.0
(ex.
1.5
2.0
3.0
3.0
12
Spl.
1.5
2.0
3.0
4.65
1.5
lex.
1.8
2.7
1.o
1.2
1.2
-_
2.2.2
10
Half Dog
Points
1.8
2.7
3.0
3.68
. I .
2.0
2.3
2.3
2.0
1.7
2.5
2.0
2.3
2.7
1.o
1.5
2.0
2.0
GENERAL NOTE:
For additional requirements, refer to Table 2 and Sections 2 and 3.
.. ... ... . . .
1.2 . . . .&.
1.2
1.7
2.0
2.7
. .. ...
. . . ..
0.7 . .
1.0 0.9
1.0
1.2
1.0
1.8
0.7
1.0
1.2
2.0
1.2
--3
4
5
6
8
0.7
0.7
0.7
1.6
Cone and
Oval
Points
2.2.1
12
16
20
25
16
20
25
30
6.0
8.0
...
2.3
3.5
4.0
1.8
3.0
4.0
1.8
3.0
4.0
. . . . . . . . . ...
3.0
4.0
5.0
3.0
2.5
2.5
4.0 4.0
4.0
5.0 5.0
5.0
. . . . . . ... ...
3.8
5.0
6.0
3.8
5.0
6.0
3.5
5.0
6.0
3.5
5.0
6.0
. . . . . . ... ...
3.0
6.0
8.0
3.0
6.0
8.0
... . . . . . .
3.0
6.0
8.0
3.0
6.0
8.0
... ...
5.0 5.0
6.0 6.0 5.0
5.0
9.0 9.0 6.0 8.0 8.0 8.0
0.0 10.0 10.0 10.0 10.0 10.0
__
... ...
5.0 5.0
... ...
7.0 6.0 6.0
8.0 8.0 7.c
12.0 12.0 10.c 10.0 10.0 10.0
12.0 12.0
12.0
12.0 12.0 12.c
2.2.2
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
ASMElANSl B18.3.6M-1986
Slight flat
permissable
_-----
______
or rounding
permissible
Oval Point
Slight fillet
permissible,
- 1
Type II
-__--
Type I
Slight chamfer or
radius permissible
Half Dog Point
Cone Point
Type 111
TABLE 2
D
Nominal
Size
or Basic
Screw
Diameter
1.6
2
2.5
3
4
Cup Point
Diameter
for Types
I and 111
Max. Min.
c2
Cup Point
Diameter
for Types
II, IV, and V
Flat
Point
Diameter
Oval
Point
Radius
Max.
Min. Max.
Min. Max.
0.80 0.55
1.00 0.75
1.20 0.95
1.40 1.15
2.00 1.75
0.80 0.64
1.00 0.82
1.25 1.05
1.50 1.28
2.00 1.75
0.80 0.5E
1.00 0.7E
1.50 1.2E
2.00 1.7E
2.50 2.2E
5
6
8
10
2.50 2.25
3.00 2.75
5.00 4.70
6.00 5.70
2.50
3.00
4.00
5.00
3.50
4.00
5.50
7.00
12
16
20
24
8.00 7.64
10.00 9.64
13.57
16.00 15.57
See para.
2.22
2.68
3.65
4.6C
1.60
2.28
2.65
3.2C
3.7C
5.2C
6.64
2.5.5
Min.
1.20
1.50
1.88
2.25
3.00
4.55 3.75
5.30 4.50
6.80 6.00
8.30 7.50
2.5.2
9.00
12.00
15.00
18.00
and Over;
118 deg. for
Shorter Lengths
1.90
3
3
3.80
4
5
Length
Max.
Min. Max.
Min. Max.
0.16
0.20
0.25
0.30
0.40
0.80
1.00
1.50
2.00
2.50
0.55
0.75
1.25
1.75
2.25
0.53
0.64
0.78
0.92
1.20
0.40
0.50
0.63
0.75
1.oo
3.50
4.00
5.50
2.50
7.00
3.20
3.70
1.2
5.20
1.6
12
6.64
1.37
1.74
2.28
2.82
1.25
1.'50
2.00
2.50
0.50
1.50
2.00
16
12.80 20
15.80 25
30
3.00
4.00
5.00
Diameter
Point
6
8
2.5.3
GENERAL NOTE:
0
40
0
0
10
2.0
2.4
3.2
Min.
--
2.5.4
6.00
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
ASME/ANSI B18.3.6M-1986
k ~4Width of
2.3 Length
overcut
Up to 12; incl.
Over 12 to 50, incl.
Over 50
Nominal
Socket
Size
Dimensions
Across Flats
+0.3
k0.5
+0.8
c
2.4 Threads
Dimensions
Across Corners
Max.
Min.
0.7
0.9
1.3
1.5
0.724
0.902
1.295
1.545
0.71 1
0.889
1.270
1 .520
0.803
1.003
1.427
1.730
2
2.5
3
2.045
2.560
3.071
2.020
2.520
3.020
2.300
2.870
3.440
4
5
6
8
4.084
5.084
6.095
8.1 15
4.020
5.020
6.020
8.025
4.580
5;720
6.860
9.1 50
10
12
10.127
12.146
10.025
12.032
Min.
11.500
13.800
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
ASMElANSl B18.3.6M-1986
r"t
- 1 N P -
[Note
Details of
TABLE 4
Nom.
Spline
Socket
Size
Number
of
Teeth
Socket
Major
Diameter
Socket
Minor
Diameter
Width
of
Tooth
Max.
Min.
Max.
Min.
Max.
Min.
0.84
1.22
1.52
2.44
4
6
6
6
0.889
1.270
1.575
2.489
0.864
1.245
1.549
2.464
0.660
1.041
1.295
2.083
0.648
1.016
1.270
2.032
0.305
0.279
0.356
0.559
0.292
0.254
0.330
0.533
2.82
3.68
4.65
5.49
6
6
6
6
2.921
3.785
4.775
5.61 3
2.870
3.734
4.724
5.563
2.489
3.251
4.140
4.826
2.438
3.200
4.089
4.775
0.635
0.81 3
0.991
1.270
0.584
0.762
0.940
1.219
6.38
9.45
11-53
15.11
6
6
6
6
6.502
9.652
11.760
15.342
6.452
9.576
11.684
15.265
5.613
8.103
9.804
12.929
5.563
8.026
9.728
12.852
1 .524
2.337
2.845
3.505
1.473
2.261
2.769
3.404
NOTES:
(1) The tabulated dimensionsrepresent direct metric conversions of the equivalent inch
size spline
sockets shown in ASME/ANSI 818.3, Socket Cap, Shoulder, and Set Screws (Inch Series).
Therefore, the spline keys and bits shown therein
are applicable for wrenching the corresponding
size metric spline sockets.
(2) Where spline sockets are chamfered, the depth of chamfer
shall not exceed 10% of the nominal
socket size for sizes up toand including1.52 and 7.5% for larger sizes. For chamfered sockets, it
is permissible for the NOTGO socket gage t o enter t o the depth of chamfer.
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
ASME/ANSI B18.3.6M-1986
Standard handle
GO
4.020
Mark
hexagon
Truncate
t o dimension
NOT GO
---
4.084
with size
( A min.)
with Mark
size
(E max.)
Truncate hexagon
to dimension
5 deg. chamfer
optional
GO Member
Optional
Construction
for Small Sizes
Construction
TABLE 5
Nominal
Socket
Size
Small for
Sizes
I
Flats
NOT GO Member
GO Gage
Width Across
GO Gage
Width Across
Corners
GO
Gage
length
Usable
NOT GO
length
Width
Max.
.Min.
Max.
Min.
Min.
Min.
0.7
0.9
1.3
1.5
2.0
0.714
0.892
1.273
1.523
2.023
0.71 1
0.889
1.270
1.520
2.020
0.803
1.003
1.427
1.730
2.300
0.798
0.998
1.422
1.725
2.295
1.5
2.4
4.7
5.0
5.0
2.5
3.0
4.0
5.0
2.525
3.025
4.025
5.025
2.520
3.020
4.020
5.020
2.870
3.440
4.580
5.720
2.865
3.435
4.575
5.71 5
6.0
8.0
10.0
12.0
6.025
8.030
10.030
12.037
6.020
8.025
10.025
12.032
6.860
9.150
11.500
13.800
6.855
9.345
11.495
13.795
Thickness
Max.
Min.
Max.
Min.
1.5
2.4
4.7
5.0
5.0
0.724
0.902
1.295
1.545
2.045
0.721
0.899
1.293
1.542
2.042
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
2.560
3.071
4.084
5.084
2.555
3.066
4.079
5.079
1.80
2.30
1.75
2.25
8.0
8.0
12.0
12.0
12.0
16.0
20.0
24.0
6.095
8.115
10.127
12.146
6.090
8.1 10
10.122
12.141
2.80
3.80
4.80
5.75
2.75
3.75
4.75
5.70
...
...
...
...
...
...
...
...
...
...
...
.,.
. ~.
.,.
Width Across
Corners
Max.
Min.
0.782
0.980
1.397
1.68
2.23
0.770
0.968
1.384
1.66
2.21
2.79
3.35
2.77
3.33
...
...
...
...
...
..*
...
...
...
...
...
...
GENERAL NOTES:
(a) Gages shall be made from steel, hardened and temperedt o a hardness of HRC 60 minimum. They shall be thermally stabilizedand
given suitable surface treatmentt o obtain maximum abrasion resistance.
(b) The form of hexagonal gage members shall be within the tolerance zone specified. See ANSI Y14.5M, Engineering Drawing and
Related Documentation Practices, Dimensioning andTolerancing.
(c) The surface roughness on hexagonal flats shall be 0.2 pm [arithmetical average) maximum. See ANWASME 646.1, Surface
Texture.
(d) The gage handles shall conform t o ANSI 847.1, Gage Blanks.
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
ASME/ANSI B18.3.6M-1986
SOCKET
SERIES
SET SCREWS
METRIC
Standard handle
GO member
NOT GO member
Details
- - - - - --
GO Gage
Members
- ----4 Spline
6 Spline
TABLE 6
~~
GO Gage
Space
Width
Gage
Length
Length
NOT GO
Gage
Diameter
Nominal
Socket
Size
Number
of
Splines
0.84
1.22
1.52
2.44
Minor
Diameter
Major
Diameter
Max.
Min.
Max.
Min.
Max.
Min.
Min.
Min.
4
6
6
6
0.856
1.237
1.542
2.456
0.851
1.232
1.537
2.451
0.640
1,008
1.262
2.024
0.635
1.003
1.257
2.01 9
0.318
0.292
0.368
0.572
0.31 3
0.287
0.363
0.567
1.5
1.5
1.5
2.5
2,82
3.68
4.65
5.49
6
6
6
6
2.863
3.726
4.71 7
5.555
2.858
3.721
4.7.1 2
5.550
2.431
3.193
4.082
4.768
2..426
3.188
4.077
4.763
0.648
0.826
1.003
1.283
0.643
0.821
0.998
1.278
6.38
9.45
11.53
15.11
6
6
6
6
6.444
9.568
11.676
15.258
6.439
9.563
11.671
18.253
5.555
8.019
9.721
12.845
5.550
8.01 4
9.71 6
12!840
1.537
2.350
2.858
3.518
1.532
2.345
2.853
3.51 3
Max.
Min.
3..0
3.0
3.0
5.0
0.662
1.043
1.297
2.085
0.660
1.041
1.295
2.083
3.0
4.0
5.0
5.5
6.0
8.0
10.0
11.0
2.491
3.253
4.142
4.828
2.489
3.251
4.140
4.826
6.0
9.0
11.0
13.0
12.0
18.0
22.0
26.0
5.61 5
8.105
9.806
12.931
5.613
8.103
9.804
12.929
GENERAL NOTES:
(a) Gages shall be made from steel, hardened and tempered to a hardness of HRC 60 minimum. They shall be thermally stabilizedand
given suitable surface treatmentt o obtain maximum abrasion resistance.
(b) The form of hexagonal gage members shall be within the tolerance
zone specified. See ANSI Y14.5M, Engineering Drawing and
Related.Documentation Practices; Dimensioning and Tolerancing.
(c) The surface roughness on hexagonal flats shall be 0.2 prn (arithmetical average) maximum. See ANSI/ASME B46.1, Surface
Texture.
(d) The gage handles shall conform to ANSI 847.1, Gage Blanks.
NOTE:
(1 The tabulated dimensionsrepresent direct metric conversions of the equivalent inch
size spline socket gages shown in ASME/ANSI
B18.3, Socket Cap, Shoulder and Set Screws (Inch
Series). Therefore, the spline socket gages shown thereinare applicable to gaging of the correspondingsize metric spline sockets.
rds.com
nystanda
.a
w
w
w
/
:/
p
t
t
h
ASMElANSl 818.3.6M-1986
2.5.4 Half Dog Points. Half dog points shallconform to the following limitations on concentricity and
squareness.
(a) Concentricity. The axis of half dog points shall
be concentric with the axis of the threadwithin a total
indicator reading equivalent to 6% of the nominal
screw diameter, but shall in no case exceed 0.25 mm
for nominal sizes up to and including 16 mm, nor 0.5
mm for larger sizes.
(b)Squareness. The planeof the end of the half dog
point shall beperpendicular to the axis of the thread
within 2deg.
Socket set screws shall conform to the following requirements pertaining to materials, processing, mechanicaland physical properties,andtestingand
sampling procedures.
3.1 Materials
various manufacturers with variations in configuration as depicted in Types I through V of the illustrations for Table 2. Where a particular point type is
required by a customer, the manufacturer shall have
the optionof supplying any of the types shown.
3.1.2 Corrosion-Resistant Steel. Corrosionresistant steel metric socket screws shall be fabricated
from austenitic corrosion-resistant steel, and physical
properties of screws, fabrication processes, and testing requirements shall conform to ASTM Specification F MOM, Stainless Steel Socket Set Screws. Unless
specified otherwise, the propertyclass shall be A1-70.
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
APPENDIX I
FORMULAS FOR DIMENSIONS
(This Appendix is not part of ASME/ANSI B18.3.6M-1986,and isincluded here
for information purposes only,)
R (min.)
larger'
R (min.) = 0.750
=
1.
Tolerances from International Standard, System of Limits and
Fits, Part 1: General, Tolerances and Deviations, IS0 R286-1962.
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
APPENDIX II
GOW%NMENT STANDARD 1T:EMS.AND PART NUMBERINGSYSTEM
!This Appendix is not part of ASME/ANSI 818.3.6M-1986, and is included here
for information purposes only.)
NOTE: The government encourages thegeneral use of this Appendix to achieve maximum parts standardization.
This Appendix establishes standard items-forGovernment application,selected from thepossible variations of items within the scope of this Standard, and
provides a part numbering system for identification
and application in engineering documents.
The following variations are standard:
(a) Diameter/Thread Pitch and Length Combinations - as specified in Table 11-1
(b) Material (Alloy Steel, or Corrosion-Resistant
Steel, Property Class A1-70) - as coded in PartNumbering System
(c) Finish (Cadmium-Plating for Alloy.Steel;
Cleaning, Descaling, and Passivation for-CorrosionResistant Steel) - as coded in Part Numbering System
(4 Point - Cup, Cone, or Flat Style
(e) Special Features - self locking if specified
U, Socket Type - hexagon
The part number shallconsist of the following element codes in the order shown:
NOTE: The PartNumbering System may also be used for nonstandard diameter and length combinations.
12
cup
K - Cone
c -
1Oths of mm
Optional Feature
N
None
L - Self-locking*
rI - 5
1Oths of mm
Socket Type
H - Hexagon
1
Code
EXAMPLE: B1836A040025CNH indicates a set screw, hexagon socket (metric) made of cadmium plated alloy steel, 4 mm in diameter, 2.5 mm in length,
with cup point style, and no special feature.
NOTE: THE GOVERNMENT ENCOURAGES THE GENERAL USEOF THIS SYSTEM TO ACHIEVE MAXIMUM PARTS STANDARDIZATION.
dards.com
n
a
t
s
y
n
.a
w
w
http://w
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
TABLE 11-1
Nominal
Length
1.5
2
2.5
3
5
6
8
10
12
16
METRIC HEXAGON SOCKET SET SCREW - STANDARD SIZES FOR GOVERNMENT USE
Nominal Diameter and Thread Pitch
3 x 0.5
2 x 0.4
020015
030020
5 x 0.8
4 x 0.7
040025
6 x 1
10 x 1.5
8 x 1.25
020040
030050
050030
060040
080050
040060
050 100
14
060100
080100
100060
100120
12.x 1.75
120080
120160
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
APPENDIX 111
DIMENSIONS OF METRIC THREADS FOR SOCKET SCREW PRODUCTS
(This Appendix is not part of ASMElANSlB18.3.6M-1986, and is includedhere
for information purposesonly.)
I
Nominal
Size
or Basic
Thread
Diameter
Pitch
Max.
11
1.6
2
2.5
3
4
0.35
0.4
0.45
0.5
0.7
1.576
1.976
2.476
2.976
3.976
Major Diameter
69 49
Pitch Diameter
Min.
Max.
1.496
1.886
2.380
2.874
3.838
1.349
1.716
2.184
2.651
3.521
Allowance
9
1.314
1.679
2.143
2.607
3.467
(l)r
Tolerance Class[Note
4969
Major
. Diameter
Root Diameter
6h
Radius
Min.
0.024
0.024
0.024
0.050
0.050
0.050
0.024
0.088
Pitch
4h
Max.
1.600
2.000
2.500
3.000
4.000
1.373
1.740
2.208
0.062
0.024
2.675
3.545
NOTES:
(1) Applies to unplated or uncoated screws and plated or coated screws before plating or coating.
(2) Applies t o plated or coated screws after platingor coating.
15
GO Gage
Minor
Max.
Diameter
1.221
1.567
2.01 3
2.459
3.242
.com
nystandards
.a
w
w
w
/
:/
p
t
t
h
........................................................
....................................................
......................................................
.............................................................
........................................................
................................................
..........................................................
.........................................................
..............................................
........................................
..................................................................
.................................................................
........
..........................................
.............................................................
............................................................
.....................
MOO111