What is the difference between nut standards?

ISO 4032 is a regular style-1 hex nut, ISO 4035 is a chamfered thin hex nut, ISO 8673 is a style-1 fine-thread hex nut, ISO 4161 is a flange nut, and DIN 981 defines KM shaft locknuts.

Metric Hex Nut Size Chart & Calculator

All Nut Types by Size

Size	Standard

Click any row to see full details in the panel on the right. All dimensions in mm.

Nut Detail

Select a row from the table to see dimensions, standards and reference image.

Compatible Bolts

Select a nut to see bolt standards with the same nominal diameter and thread pitch.

Standards Reference

ISO 4032:2012 Hexagon nuts, style 1 — Product grades A and B (full-height hex nut).
ISO 4034:2012 Hexagon nuts — Product grade C (coarse tolerance).
ISO 4035:2012 Hexagon thin nuts — Product grades A and B (jam/locking).
DIN 981 Slotted KM locknuts for bearing and shaft location — Used with matching lock washers.
ISO 8673:2012 Hexagon nuts, style 1 — Metric fine-pitch thread.
ISO 4161 Hexagon nuts with integral flange (non-prevailing-torque type).
ISO 8675:2012 Hexagon thin nuts — Metric fine-pitch thread.
ISO 272:1979 Widths across flats (SW/AF defining standard).
ISO 261:2015 Metric screw threads — Coarse and fine pitch series.
DIN EN ISO 898-2 Mechanical properties of fasteners — Nut property classes.

Frequently Asked Questions

What does the Nut Size Chart show?

The chart lists standard-specific dimensions and pitches for ISO nuts from M4 to M64. DIN 981 KM shaft locknut thread designations are included separately from KM0 to KM40 (M10 to M200).

How do I use the Nut Size Chart?

Click a row to see its dimensions and compatible bolt families. A bolt match requires the same nominal diameter and pitch; length depends on the actual joint stack.

Is the Nut Size Chart free to use?

Yes. This metric hex nut size chart is free and runs in the browser without any installation.

What is the difference between ISO 4032, ISO 4035 and DIN 981?

ISO 4032 is a regular style-1 hex nut. ISO 4035 is a chamfered thin nut. DIN 981 defines slotted KM locknuts for bearing and shaft positioning, normally secured with matching lock washers.

How do I know which wrench size to use?

The wrench size equals the width across flats (SW) dimension, but it varies by standard. For example, ISO 4032 M10 uses SW=16 mm, while ISO 4035 M10 uses SW=17 mm.