Inch and Metric Size, Technopolymer Plastic
Safety Lobed Knobs
With Steel Tapped Insert

GN 5337.3


RoHS Compliant
 

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Specification
Information

Hand knob: Special glass-fiber reinforced technopolymer plastic, black matte finish    
Tapped insert, screw and spring: Steel, black oxide finish
Molded-in inlay: Zinc die cast

GN 5337.3 safety lobed knobs are best suited for applications where any unintended loosening of the knob may lead to accidents.
In non-operative mode, the lobe knob is not engaged with the tapped insert; i.e., the knob can be turned easily.
Only after axial pushing of the knob does the knob engage with the insert, so that it may be tightened or loosened.
After release, the serrations disengage by means of a spring.
The five lobe design is visually appealing and also gives the operator the means to achieve higher torque.
Temperature resistant to 130°C (355°F).  
Resistant to solvents, oils, grease and other chemical agents.
Versions with stainless steel inserts or with colored cover caps available upon request.
Other modifications such as cross holes, set screw holes and threaded studs also available upon request.
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Inch Table

Dimensions in:

inches
(millimeters)

Part Number d1 d2
Tapped
d3 d4 d5 h1 h2 h3 h4 t
min.
3TCN1K
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1.57
(40)
1/4-20 .53
(13.5)
.71
(18)
.53
(13.5)
1.18
(30)
.55
(14)
.28
(7)
.10
(2.5)
.43
(11)
5TCN1K
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5/16-18
5TCN2K
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1.97
(50)
5/16-18 .63
(16)
.87
(22)
.65
(16.5)
1.34
(34)
.59
(15)
.31
(8)
.14
(3.5)
.55
(14)
6TCN2K
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3/8-16
Metric Table

Dimensions in:

millimeters
(inches)

Part Number d1 d2
Tapped
d3 d4 d5 h1 h2 h3 h4 t
min.
6NCN1K
Download the CAD 
40
(1.57)
M6 x 1.0 13.5
(.53)
18
(.71)
13.5
(.53)
30
(1.18)
14
(.55)
7
(.28)
2.5
(.10)
11
(.43)
8NCN1K
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M8 x 1.25
8NCN2K
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50
(1.97)
M8 x 1.25 16
(.63)
22
(.87)
16.5
(.65)
34
(1.34)
15
(.59)
8
(.31)
3.5
(.14)
14
(.55)
10NCN2K
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M10 x 1.5