Metric Size, Steel
Clamping Screws
GN 251
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GN 251


RoHS Compliant

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GN 251
Specification
Information

Type AK--
Body: Steel, black oxide finish
Hex head of screw hardened
Type BK--
Body: Steel, nickel plated finish

Polyurethane disc, 90 Shore hardness

Hex nut (both versions): Steel, zinc plated, blue passivated

GN 251 Clamping Screws have a hardened round head to handle greater clamping forces. A hex jam nut is supplied for locking the screw in place.
BK type with Polyurethane disk functions as a dampening element or to protect surfaces.

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Dimensions in:

millimeters
(inches)

Part Number
d
Thread
l1
Stud Length
e
k
l2
max.
s
A/F
AK Type
BK Type
--
M3 x .5
10
6.4
(.26)
2
(.08)
1.5
(.06)
5.5
(.22)
--
15
--
20
--
25
--
30
--
M4 x .7
10
8.1
(.31)
2.8
(.11)
2.1
(.08)
7
(.28)
15
20
25
30
35
40
--
M5 x .8
10
9.2
(.37)
3.5
(.14)
2.4
(.10)
8
(.31)
15
20
25
30
35
40
--
50
--
M6 x 1.0
15
11.5
(.45)
4
(.16)
3
(.12)
10
(.39)
20
25
30
35
40
50
Part Number
d
Thread
l1
Stud Length
e
k
l2
max.
s
A/F
AK Type
BK Type
--
M8 x 1.25
15
15
(.59)
5.5
(.22)
4
(.16)
13
(.51)
20
25
30
35
40
50
--
60
--
70
--
80
--
M10 x 1.5
20
19.5
(.77)
7
(.28)
5
(.20)
17
(.67)
30
35
40
50
--
60
--
70
--
80
--
M12 x 1.75
30
22
(.87)
8
(.31)
5
(.20)
19
(.75)
--
35
--
40
--
50
--
60
--
70
--
80
--
M16 x 2.0
50
27.5
(1.08)
10
(.39)
6
(.24)
24
(.94)
--
60
--
70
--
80