Inch and Metric Size, Steel or Stainless Steel
Grub Screw and Thrust Pad Assemblies
GN 638
GN 638-NI
GN 638-NV

GN 638


RoHS Compliant

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Specification
Information

Grub screw:
GN 638--Steel, black oxide finish
GN 638-NI and GN 638-NV--Stainless steel, European standard No. 1.4305 (American standard 303)
Thrust pad:
GN 638 and GN 638-NI--Matte black technopolymer plastic (Polyacetal POM)
GN 638-NV--Stainless steel, European standard No. 1.4305 (American standard 303)
O-ring (GN 638-NV only): FPM Rubber (Viton®)

GN 638 grub screw and thrust pad assemblies are a low cost solution for clamping operations or for load bearing purposes.
Another good feature is a smaller size ball diameter than the trunk of the threaded stud. As a result, the studs can be screwed into position from the ball side. The thrust pad can easily be hammered onto the ball end of the screw, and also easily dismantled.
Static load capacity has been determined by a series of tests but are approximate. For these tests the loads were placed vertically and centrally over the stud. At the measured load of 3500 N there was no remaining deformation visible on the thrust pad nor was there any breakage.
A combination of these assemblies with any handle component will give useful clamping options.
GN 638 and GN 638-NI temperature resistant to 80°C (175°F), GN 638-NV temperature resistant to 200°C (390°F)
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Inch Table

Dimensions in:

,inches
(millimeters)

Part Number
d2
Thread
l1
Stud Length
d1
l2
A/F
Static Load [N]
GN 638
Steel Screw
and Plastic Pad
1/4-20
1.02
.59
(15)
.30
(7.6)
.13
(3.2)
3500
1.42
1.81
5/16-18
.79
.59
(15)
.30
(7.6)
.13
(3.2)
3500
1.38
1.77
2.28
3/8-16
1.34
.71
(18)
.36
(9.2)
.19
(4.8)
3500
1.73
2.24
2.91
Part Number
d2
Thread
l1
Grub Screw Length
d1
l2
A/F
Static Load [N]
GN 638
Steel Screw
and Plastic Pad
3/8-16
1.34
83
(21)
.39
(10)
.19
(4.8)
3500
1.73
2.24
2.91
1/2-13
1.34
83
(21)
.39
(10)
.19
(4.8)
3500
2.24
2.91
3.70
3/8-16
1.34
.98
(25)
.41
(10.5)
.19
(4.8)
3500
1.73
2.24
2.91
1/2-13
1.34
.98
(25)
.41
(10.5)
.19
(4.8)
3500
2.24
2.91
3.70
Part Number
d2
Thread
l1
Grub Screw Length
d1
l2
A/F
Static Load [N]
GN 638
Steel Screw
and Plastic Pad
3/8-16
1.34
1.26
(32)
.43
(11)
.19
(4.8)
3500
1.73
2.24
2.91
1/2-13
1.34
1.26
(32)
.43
(11)
.19
(4.8)
3500
2.24
2.91
3.70
3/8-16
1.34
1.57
(40)
.51
(13)
.19
(4.8)
3500
1.73
2.24
2.91
1/2-13
1.34
1.57
(40)
.51
(13)
.19
(4.8)
3500
2.24
2.91
3.70
 
Metric Table

Dimensions in:

,millimeters
(inches)

Part Number
d2
Thread
l1
Stud Length
d1
l2
A/F
Static Load [N]
GN 638
Steel Screw
and Plastic Pad
GN 638-NI
Stainless Steel Screw and Plastic Pad
GN 638-NV
All Stainless Steel Screw and Pad
--
M6 x 1
26
15
(.59)
7.6
(.30)
3
(.12)
3500
--
36
--
46
--
M8 x 1.25
20
15
(.59)
7.6
(.30)
4
(.16)
3500
--
35
--
45
--
58
--
M8 x 1.25
20
18
(.71)
9.2
(.36)
4
(.16)
3500
--
35
--
45
--
58
--
M10 x 1.5
34
18
(.71)
9.2
(.36)
5
(.20)
3500
--
44
--
57
--
74
Part Number
d2
Thread
l1
Grub Screw Length
d1
l2
A/F
Static Load [N]
GN 638
Steel Screw
and Plastic Pad
GN 638-NI
Stainless Steel Screw and Plastic Pad
GN 638-NV
All Stainless Steel Screw and Pad
M8 x 1.25
20
21
(.83)
10
(.39)
4
(.16)
3500
35
45
58
M10 x 1.5
34
21
(.83)
10
(.39)
5
(.20)
3500
44
57
74
M12 x 1.75
34
21
(.83)
10
(.39)
6
(.24)
3500
57
74
94
M8 x 1.25
20
25
(.98)
10.5
(.41)
4
(.16)
3500
35
45
58
Part Number
d2
Thread
l1
Grub Screw Length
d1
l2
A/F
Static Load [N]
GN 638
Steel Screw
and Plastic Pad
GN 638-NI
Stainless Steel Screw and Plastic Pad
GN 638-NV
All Stainless Steel Screw and Pad
M10 x 1.5
34
25
(.98)
10.5
(.41)
5
(.20)
3500
44
57
74
M12 x 1.75
34
25
(.98)
10.5
(.41)
6
(.24)
3500
57
74
94
M8 x 1.25
20
32
(1.26)
11
(.43)
4
(.16)
3500
35
45
58
M10 x 1.5
34
32
(1.26)
11
(.43)
5
(.20)
3500
44
57
74
Part Number
d2
Thread
l1
Grub Screw Length
d1
l2
A/F
Static Load [N]
GN 638
Steel Screw
and Plastic Pad
GN 638-NI
Stainless Steel Screw and Plastic Pad
GN 638-NV
All Stainless Steel Screw and Pad
M12 x 1.75
34
32
(1.26)
11
(.43)
6
(.24)
3500
57
74
94
M8 x 1.25
20
40
(1.57)
13
(.51)
4
(.16)
3500
35
45
58
M10 x 1.5
34
40
(1.57)
13
(.51)
5
(.20)
3500
44
57
74
M12 x 1.75
34
40
(1.57)
13
(.51)
6
(.24)
3500
57
74
94