Unbrako Metric Socket Set Screws Dimensions Chart
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METRIC SOCKET SET SCREWS
Knurled Cup Point and Plain Cup Point
Dimensions
Threads: ANSI B 1.13M, ISO 261, ISO 262
NOTES
(coarse series only)
1. Material: ASTM F912M
Grade: 45H
2. Hardness: Rockwell C45-53
Applicable or Similar Specifications: ANSI B 18.3.6M,
3. Angle: The cup angle is 135 maximum for screw
ISO 4029, DIN 916, DIN 915, DIN 914, DIN 913
lengths equal to or smaller than screw diameter. For
longer lengths, the cup angle will be 124 maximum
4. Thread Class: 4g 6g
KNURLED CUP POINT
PLAIN CUP POINT
LENGTH TOLERANCE
nominal screw diameter
M1.6 thru M24
nominal
screw length
tolerance on lgth., mm
Up to 12 mm, incl.
±0.3
Over 12 to 50 mm, incl.
±0.5
Over 50 mm
±0.8
DIMENSIONS
APPLICATION DATA
L
recommended*
J max.
nom.
D
K
W
min. preferred
seating torque
thread
size
pitch
max.
plain cup
knurled cup
max.
plain cup
knurled cup
nom.
N-m
in-lbs.
MICROSIZE – Plain Cup Only
M1.6
0.35
1.0
0.80
–
–
2.0
–
0.7
0.09
0.8
M2
0.40
1.32
1.00
–
–
2.5
–
0.9
0.21
1.8
M2.5
0.45
1.75
1.25
–
–
3.0
–
1.3
0.57
5.0
STANDARD SIZE – Knurled Cup Point Supplied Unless Plain Cup Point Is Specified
M3
0.5
2.10
1.50
1.40
2.06
3.0
3.0
1.5
0.92
8.0
M4
0.7
2.75
2.00
2.10
2.74
3.0
3.0
2.0
2.2
19.0
M5
0.8
3.70
2.50
2.50
3.48
4.0
4.0
2.5
4.0
35.0
M6
1.0
4.35
3.00
3.30
4.14
4.0
5.0
3.0
7.2
64
M8
1.25
6.00
5.00
5.00
5.62
5.0
6.0
4.0
17.0
150.0
M10
1.5
7.40
6.00
6.00
7.12
6.0
8.0
5.0
33.0
290
M12
1.75
8.60
8.00
8.00
8.58
8.0
10.0
6.0
54.0
480
M16
2.0
12.35
10.00
10.00
11.86
12.0
14.0
8.0
134
1190
M20
2.5
16.00
14.00
14.00
14.83
16.0
18.0
10.0
237
2100
M24
3.0
18.95
16.00
16.00
17.80
20.0
20.0
12.0
440
3860
All dimensions in millimeters.
*Not applicable to screws with a length equal to or less than the diameter. See Note, page 1.
44
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