Metric Size, Steel
Heavy Duty Washers
GN 6339

RoHS Compliant

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DIN 6340
Specification
Information

Washer body: Steel, 42CrMoS4V, Material-No. 1.7227, case hardened to tensile strength Rm = 1220 - 1400 N/mm2, fine machined and fine ground
Type BT - Blackened finish
Type GO - GEOMET 500 coating (integrated aluminum/zinc)
Available in high and low types


The effect of a washer on the quality of a threaded connection is often underestimated. GN 6339 washers provide a high quality connection. High static clamping force can be achieved without loss of tension.
At a specified preloaded clamping force, it is often possible to use thinner bolts. This can result in a better ratio between clamping distance and bolt diameter, minimizing the danger of failure.
The case-hardened, smooth bolt head/screw contact face results in a lower and more constant friction co-efficient, even when continuous clamping and releasing is required.
GN 6339 washers are suitable only for machine construction bolts of classes 8.8 / 10.9 / 12.9, and not for DIN 6916 steel bolts.
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High Type

Dimensions in:

millimeters
(inches)

Part Number d1 H13
d2 h13 s
+/- .2 mm
d3 H13 f
+/- .2 mm
High Type
Fits
Metric Bolt Size
Type BT Type GO
6M17FBCK
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6M17FBC/G5
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6.3
17
3
7
1
M6
8M21FBCK
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8M21FBC/G5
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8.4
21
4
9.5
1.5
M8
10M25FBCK
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10M25FBC/G5
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10.4
25
4
11.5
1.5
M10
12M30FBCK
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12M30FBC/G5
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12.5
30
6
14
2
M12
14M36FBCK
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14M36FBC/G5
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14.5
36
6
16
2
M14
16M40FBCK
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16M40FBC/G5
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16.5
40
6
18
2
M16
18M44FBCK
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18M44FBC/G5
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18.5
44
8
21
2.5
M18
20M44FBCK
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20M44FBC/G5
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20.5
44
8
23
2.5
M20
22M50FBCK
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22M50FBC/G5
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22.5
50
8
25
2.5
M22
24M50FBCK
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24M50FBC/G5
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24.5
50
10
27
3.5
M24
27M60FBCK
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27M60FBC/G5
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28
60
10
31
3.5
M27
30M68FBCK
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30M68FBC/G5
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31
68
10
34
3.5
M30
 
Low Type

Dimensions in:

millimeters
(inches)

Part Number d1 H13 d2 h13 s
+/- .2 mm
d3 H13 f
+/- .2 mm
Low Type
Fits
Metric Bolt Size
Type BT Type GO
6M12FBDK
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6M12FBD/G5
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6.3
12
2.5
7
.6
M6
8M16FBDK
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8M16FBD/G5
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8.4
16
2.5
9.5
.75
M8
10M20FBDK
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10M20FBD/G5
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10.4
20
3
11.5
.75
M10
12M24FBDK
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12M24FBD/G5
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12.5
24
3.5
14
1
M12
14M28FBDK
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14M28FBD/G5
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14.5
28
3.5
16
1
M14
16M30FBDK
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16M30FBD/G5
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16.5
30
4
18
1
M16
18M34FBDK
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18M34FBD/G5
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18.5
34
5
21
1.5
M18
20M37FBDK
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20M37FBD/G5
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20.5
37
5
23
1.5
M20
22M40FBDK
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22M40FBD/G5
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22.5
40
5
25
1.5
M22
24M44FBDK
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24M44FBD/G5
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24.5
44
5
27
1.5
M24
27M50FBDK
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27M50FBD/G5
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28
50
6
31
1.5
M27
30M56FBDK
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30M56FBD/G5
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31
56
6
34
1.5
M30
36M66FBDK
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36M66FBD/G5
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37
66
7
40
2
M36