Metric Size, Aluminum
Torque Limiting Knurled Knobs
With Steel Hub
GN 3663
GN 420
RoHS Compliant

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GN 420
Specification
Information
Knob body: Aluminum, black anodized finish
Torque mechanism: Steel, blackened finish
Other components: Steel, hardened
Cover cap: Plastic, light gray matte finish

 

GN 3663 torque limiting knobs are used when manually applied torque is to be limited.
When turned clockwise, the torque mechanical system of the knurled knob triggers an "over-engagement" as soon as the specified torque is reached. When tightening, this insures that maximum permissible torque is not exceeded. When turned counter-clockwise, loosening the knob mechanism, the mechanical system locks so that the torque is not limited. Torque necessary for release will always be transmitted properly.
After removal of cover and loosening of the countersunk screw, threaded or plain bore insert can be dismantled.
Versions with inch size threaded or plain bores available upon request.
For version with threaded stud see GN 3663.

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Dimensions in:

millimeters
(inches)

Part Number
d1
d2
Tapped
d3
H7 Bore
d5
d6
h1
h2
t
Torque
+/- 10%
in Nm
27
(1.06)
M3 x .5
--
10
(.39)
19
(.75)
35
(1.38)
9.5
(.37)
7
(.28)
.7
3663-27-M3-1
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1.0
3663-27-M3-1.5
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1.5
--
B5
.7
3663-27-B5-1
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1.0
3663-27-B5-1.5
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1.5
27
(1.06)
M4 x .7
--
10
(.39)
19
(.75)
35
(1.38)
9.5
(.37)
9
(.35)
.7
3663-27-M4-1
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1.0
3663-27-M4-1.5
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1.5
M5 x .8
--
.7
3663-27-M5-1
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1.0
3663-27-M5-1.5
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1.5
M6 x 1.0
--
.7
3663-27-M6-1
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1.0
3663-27-M6-1.5
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1.5
--
B6
.7
3663-27-B6-1
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1.0
3663-27-B6-1.5
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1.5
Part Number
d1
d2
Tapped
d3
H7 Bore
d5
d6
h1
h2
t
Torque
+/- 10%
in Nm
3663-34-M3-1
Download the CAD
34
(1.34)
M3 x .5
--
10
(.39)
21
(.83)
37.5
(1.48)
9.5
(.37)
7
(.28)
1.0
3663-34-M3-1.5
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1.5
3663-34-M3-2.2
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2.2
3663-34-B5-1
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--
B5
1.0
3663-34-B5-1.5
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1.5
3663-34-B5-2.2
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2.2
3663-34-M4-1
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34
(1.34)
M4 x .7
--
10
(.39)
21
(.83)
37.5
(1.48)
9.5
(.37)
9
(.35)
1.0
3663-34-M4-1.5
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1.5
3663-34-M4-2.2
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2.2
3663-34-M5-1
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M5 x .8
--
1.0
3663-34-M5-1.5
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1.5
3663-34-M5-2.2
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2.2
3663-34-M6-1
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M6 x 1.0
--
1.0
3663-34-M6-1.5
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1.5
3663-34-M6-2.2
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2.2
3663-34-B6-1
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--
B6
1.0
3663-34-B6-1.5
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1.5
3663-34-B6-2.2
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2.2
Part Number
d1
d2
Tapped
d3
H7 Bore
d5
d6
h1
h2
t
Torque
+/- 10%
in Nm
3663-42-M6-2
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42
(1.65)
M6 x 1.0
--
13.5
(.53)
27
(1.06)
43.5
(1.71)
11.5
(.45)
11
(.43)
2.0
3663-42-M6-2,5
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2.5
3663-42-M6-3.2
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3.2
3663-42-B6-2
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--
B6
2.0
3663-42-B6-2,5
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2.5
3663-42-B6-3.2
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3.2
3663-42-M8-2
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42
(1.65)
M8 x 1.25
--
13.5
(.53)
27
(1.06)
43.5
(1.71)
11.5
(.45)
11
(.43)
2.0
3663-42-M8-2,5
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2.5
3663-42-M8-3.2
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3.2
3663-42-B8-2
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--
B8
2.0
3663-42-B8-2,5
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2.5
3663-42-B8-3.2
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3.2
3663-52-M10-2.5
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52
(2.05)
M10 x 1.5
--
19
(.75)
32
(1.26)
54
(2.13)
15.5
(.61)
15
(.59)
2.5
3663-52-M10-3.0
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3.0
3663-52-M10-4.0
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4.0
3663-52-B10-2.5
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--
B10
2.5
3663-52-B10-3.0
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3.0
3663-52-B10-4.0
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4.0
Part Number
d1
d2
Tapped
d3
H7 Bore
d5
d6
h1
h2
t
Torque
+/- 10%
in Nm
3663-52-M12-2.5
Download the CAD
52
(2.05)
M12 x 1.75
--
19
(.75)
32
(1.26)
54
(2.13)
15.5
(.61)
15
(.59)
2.5
3663-52-M12-3.0
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3.0
3663-52-M12-4.0
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4.0
3663-52-B12-2.5
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--
B12
2.5
3663-52-B12-3.0
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3.0
3663-52-B12-4.0
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4.0
3663-62-M10-3.0
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62
(2.44)
M10 x 1.5
--
19
(.75)
33
(1.30)
54
(2.13)
15.5
(.61)
15
(.59)
3.0
3663-62-M10-4.0
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4.0
3663-62-M10-5.5
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5.5
3663-62-B10-3.0
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--
B10
3.0
3663-62-B10-4.0
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4.0
3663-62-B10-5.5
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5.5
3663-62-M12-3.0
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62
(2.44)
M12 x 1.75
--
19
(.75)
33
(1.30)
54
(2.13)
15.5
(.61)
15
(.59)
3.0
3663-62-M12-4.0
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4.0
3663-62-M12-5.5
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5.5
3663-62-B12-3.0
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--
B12
3.0
3663-62-B12-4.0
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4.0
3663-62-B12-5.5
Download the CAD
5.5