Fastener Guide / Technical Reference

Nylon-Insert Locknuts

A nylon ring in the top of the nut grips the bolt thread and resists loosening. Temperature and chemicals limit where it can be used.

Last reviewed 2026-09-10 · Governing standard: IFI 100/107; ISO 7040; ISO 10511 · reference FG-F27413 · Report an error on this sheet

Limits

TemperatureAbout 250 F (121 C) max
ReuseLimited; prevailing torque drops each time
MetricISO 7040 (regular), ISO 10511 (thin); DIN 982 / 985

These tables carry the same figures as the printed sheet below.

The printed sheet

Nylon-Insert Locknuts

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Text version of this sheet

Nylon-insert prevailing-torque locknuts · ISO 7040 / 10511

What it is

FIELD IDENTIFICATION

A nylon ring in the top of the nut grips the bolt thread and resists loosening. Temperature and

chemicals limit where it can be used.

SIDE

NYLON RING

Nylon insert ring grips the bolt threads

Limits

Temperature

About 250 F (121 C) max

Reuse

Limited; prevailing torque drops each time

Metric

ISO 7040 (regular), ISO 10511 (thin); DIN 982 / 985

Key points

At least one to two threads should protrude past the nylon.

Governing standards: IFI 100/107; ISO 7040; ISO 10511. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take

precedence over this sheet.

torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability

arising from reliance on this reference.

Fastener Guide reference FG-F27413 · thefastenerapp.com/fastener-guide/technical-reference/nylon-insert-locknuts · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← Hex Nuts, Jam Nuts and Heavy Hex NutsPrevailing-Torque All-Metal Locknuts →

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