FRM is a slotted round lock nut, which meets the GM standard 90.25.99. The FRM lock nut is to be used on gas springs with an outer metric thread on the tube.
Product
A
B
D
E
G
FRM-16
M16x1.5
32
5
2
7
FRM-19
M24x1.5
42
6
2.5
9
FRM-150
M28x1.5
50
3
10
FRM-250
M38x1.5
58
8
3.5
11
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