HANDA. NINGBO

Part group 09 / 05 · Ningbo, China

Lock nuts,
nylon insert and all-metal.

The nut that stays where it is put: nylon-insert lock nuts to DIN 985 and ISO 7040, and all-metal types for heat, tested for the torque it takes to run them on rather than only for the thread.

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Specification

Lock Nuts to drawing

Types
DIN 985 / ISO 7040 nylon insert, DIN 982 tall type, all-metal prevailing torque per ISO 7042, plus flange and cap versions to drawing.
Threads
M3 to M24 metric, UNC / UNF and BSW, thread class 6H standard.
Materials
Carbon steel class 8 and 10, stainless A2-70 and A4-80, brass. Nylon insert PA6, rated to about 120 degrees C continuous.
Test
First prevailing torque, fifth removal and torque-out per ISO 2320 on a sample per lot, with the measured values on the inspection sheet.
Finish
Zinc, zinc-nickel or hot-dip galvanised for steel; passivated for stainless. Coating is kept thin so the insert is not flooded.

Every dimension is taken from your drawing or sample. Where this page and your drawing disagree, your drawing wins.

Where these parts go

Applications

Vibration, thermal cycling and joints that get opened and closed: locking that is measured, not assumed.

Nuts & Washers

Hex, nyloc and cap nuts; flat, spring and lock washers in four materials.

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Bolts

Hex, socket, flange, carriage and special-head bolts, class 8.8 to 12.9.

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Stainless Bolts

A2 (304) and A4 (316), classes 50 to 80, passivated on request.

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Screws

Machine, self-tapping, self-drilling, set and security screws to drawing.

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Questions buyers ask

01
What is prevailing torque and why does it matter?
It is the torque needed to turn the nut on before it seats. A nut without it backs off under vibration. ISO 2320 sets a minimum for the first run-on and after repeated removals, and we test a sample per lot instead of trusting the insert.
02
Can a nylon insert nut be reused?
A few times, yes. The class allows a defined number of removals before the torque drops below the limit. For joints opened often, an all-metal nut holds up better.
03
What temperature kills the nylon insert?
About 120 degrees C continuous, with short excursions above that. Higher than that, use an all-metal prevailing-torque nut, otherwise the locking effect is simply gone.
04
Do you supply the matching bolts?
Yes, and matched sets are packed per fixing point. Class and coating of the pair are kept the same so the joint is designed rather than assembled from mixed stock.
05
How is the nut marked?
Class mark and our identification on the bearing face, applied before plating. Your own mark can be added if you send the artwork and the face is large enough.
06
Is the insert visible from outside?
No, it sits inside the crown. We can send a photograph of a cut sample if your inspector wants to see the insert position before approving the lot.

Next step

Send one drawing.
Get a costed sheet.

Drawing or sample, material, quantity, and the destination port. We reply within one working day with unit price, tooling, lead time and shipping.

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