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Nylon Insert Lock Nut: a Nylon Collar Crimped into a Steel Nut
Cav (Wikimedia Commons) · Public domain
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18. Oktoba 2026NO
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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).
Kati
Half a day

Maagizo

1

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.

Vifaa kwa hatua hii:

Fimbo ya pembe sita ya chuma lainiFimbo ya pembe sita ya chuma laini1.5 sm

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Kereza ya ChumaKereza ya Chuma
Chombo cha kukata cha latheChombo cha kukata cha lathe
Kalipa ya VernierKalipa ya Vernier
2

Drill and tap

Drill through and tap an M10 thread.

Zana zinazohitajika:

Kekee cha NguzoKekee cha Nguzo
Seti ya kukata nyuzi za skrubuSeti ya kukata nyuzi za skrubu
Kalipa ya VernierKalipa ya Vernier
3

Counterbore the top

Counterbore the top of the bore with an ordinary twist drill. It leaves a recess with a conical floor.

Zana zinazohitajika:

Kekee cha NguzoKekee cha Nguzo
Kalipa ya VernierKalipa ya Vernier
4

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.

Vifaa kwa hatua hii:

Chembechembe za nailoniChembechembe za nailoni2 g

Zana zinazohitajika:

Mashine ya kufinyanga kwa kudungaMashine ya kufinyanga kwa kudunga
Kalipa ya VernierKalipa ya Vernier
5

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.

Zana zinazohitajika:

Kibonyezo cha mkonoKibonyezo cha mkono
6

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.

Zana zinazohitajika:

Bolti ya kichwa cha pembe sita - daraja 8.8Bolti ya kichwa cha pembe sita - daraja 8.8

Vifaa

2

Zana Zinazohitajika

9

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