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Nylon Insert Lock Nut: a Nylon Collar Crimped into a Steel Nut
A nut that will not shake loose. A nylon collar sits in a recess at the top of the nut; its hole is a little smaller than the bolt, so the bolt presses its own thread into the nylon and the nylon grips it. Sauer (US 2,450,694, 1948) chose nylon over the older fibre collar: it hardly takes up water and still locks after 50 to 100 re-uses. The collar is held as Swanstrom's patent (US 2,153,681, 1939) shows: the recess wall is pressed in and crimped over it. Size M10 is ours.
The picture: a nylon-insert lock nut (Wikimedia Commons).
Intermediate
Half a day
Instructions
1
1
Cut and turn the blank
Cut and turn the blank
Saw a blank from hex bar. On the lathe, turn the top part round, with a wall that tapers toward the top.
Materials for this step:
Mild Steel Hex Bar1.5 cmTools needed:
Hacksaw
Metal Lathe
Lathe Cutting Tool
Vernier Caliper2
2
Drill and tap
Drill and tap
Drill through and tap an M10 thread.
Tools needed:
Drill Press
Tap and Die SetVernier Caliper3
3
Counterbore the top
Counterbore the top
Counterbore the top of the bore with an ordinary twist drill. It leaves a recess with a conical floor.
Tools needed:
Drill PressVernier Caliper4
4
Mould the nylon collar
Mould the nylon collar
Mould a nylon washer that fits the recess, with a hole somewhat smaller than the bolt's outside thread diameter. Nylon is thermoplastic, so scrap can be moulded again.
Materials for this step:
Nylon Pellets2 gTools needed:
Injection Moulding MachineVernier Caliper5
5
Seat and crimp
Seat and crimp
Push the collar down onto the recess floor. In the press, squeeze the recess wall inward against the collar and bend its top edge over it.
Tools needed:
Arbor Press6
6
Try it on a bolt
Try it on a bolt
Screw the nut onto a bolt. It runs freely until the bolt reaches the collar, then turns stiffly as the bolt cuts a thread in the nylon.
Tools needed:
Hex Bolt - Grade 8.8Materials
2- 1.5 cmPlaceholder
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Tools Required
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