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The nylon collar insert is placed at the end of the nut, with an inner diameter (ID) slightly smaller than the major diameter of the screw. The screw thread does not cut into the nylon insert, however, the insert deforms elastically over the threads as tightening pressure is applied. The insert locks
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Technical Order requires replacement of self-locking nuts in critical areas. Various specifications for aerospace-grade self-locking nuts require that the running torque be maintained after a number of cycles of assembly, but without preloading the fastener.
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the nut against the screw as a result of friction, caused by the radial compressive force resulting from the deformation of the nylon. Nyloc nuts retain their locking ability up to 250 °F (121 °C).
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There are no registered trademarks filed in the United States for "Nyloc" or "Nylock" that are currently active in regards to fasteners. In
Australia, "nyloc" is a registered trademark.
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is very similar to a nyloc nut except that it uses one or more smaller nylon inserts instead of a ring of nylon. They do not lock as strongly as nyloc nuts.
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87:) notes that the nylon insert is not damaged by installation and therefore they can be reused many times, and a
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Advisory
Circular allows nuts to be reused if the prevailing torque is within specification. However, a
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Authorities disagree on whether nyloc nuts should be reused. For example, Carroll Smith (
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NASM 25027, SPECIFICATION, NUT, SELF-LOCKING, 250 °F, 450 °F, AND 800 °F.
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https://search.ipaustralia.gov.au/trademarks/search/view/102297/details
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Carroll Smith's Nuts, Bolts, Fasteners, and
Plumbing Handbook
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Carroll Smith's Nuts, Bolts, Fasteners, and
Plumbing Handbook
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collar that increases friction on the screw thread.
139:, MotorBooks/MBI Publishing Company, p. 104,
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161:"Trademark Search via Trademarkia"
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89:Federal Aviation Administration
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313:distorted thread locknut
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31:, also referred to as a
93:United States Air Force
37:polymer-insert lock nut
203:Air Force T.O. 1-1A-8.
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33:nylon-insert lock nut
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165:www.trademarkia.com
338:internal wrenching
333:interfering thread
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67:Related fasteners
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106:Mechanical joint
73:nylon pellet nut
41:elastic stop nut
16:Type of lock nut
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131:Smith, Carroll
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278:axial barrel
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168:. Retrieved
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298:castellated
403:split beam
170:2019-09-26
112:References
323:frangible
226:Esna nuts
59:Trademark
29:nyloc nut
23:Nyloc nut
453:Category
308:coupling
133:(1990),
100:See also
438:wingnut
363:locknut
358:knurled
303:clip-on
293:captive
47:with a
45:locknut
423:T-slot
408:square
328:insert
318:flange
283:barrel
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418:T-nut
413:swage
398:split
393:speed
383:rivet
378:plate
373:nyloc
273:acorn
79:Reuse
49:nylon
39:, or
433:well
428:weld
353:Keps
288:cage
141:ISBN
368:lug
348:jet
343:jam
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120:^
71:A
35:,
27:A
254:e
247:t
240:v
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