M22 Nut Dimensions: Hex & Thin Series

Q: What size wrench or spanner do I need for an M22 nut?

An M22 hex nut typically requires a 32 mm wrench or socket (under ISO 4032) or a 34 mm wrench (under the older DIN 934 standard). Due to the extreme torque required for M22 fasteners, industrial-grade impact wrenches or long-handle slugging wrenches are commonly used.

Q: What is a jam nut?

A jam nut is a low-profile hex nut, typically from the Thin Series (DIN 439), that is used to lock a standard nut in place. By tightening a standard nut against a jam nut, you create internal tension between the threads of both nuts and the bolt. This “jams” the assembly together, providing a mechanical lock that prevents loosening caused by vibration or rotation.

Q: Can a Thin Series nut handle the same torque as a Regular nut?

No. Because the Thin Series has fewer threads in contact with the bolt, it has a lower proof load. Subjecting an M22 thin nut to the high clamping forces required in structural or automotive joints is likely to result in thread stripping. For primary structural support, always use a Regular Series nut.

M22 nut dimensions or sizes are critical for truck wheel hubs, large tractor axles, and specialized structural anchor points. This size is specifically engineered to mate with fasteners having a 22.00 mm nominal diameter and is available in M22 x 2.5 for the coarse series and M22 x 1.5 for the fine series.

This charts is based on the Regular Series (DIN 934 / ISO 4032) for standard load-bearing applications and the Thin or Half Series (DIN 439 / ISO 4035), which is ideal for jam nut or lock nut configurations or applications with limited vertical clearance. The thread dimensions comply with DIN 13-1 (coarse), DIN 13-21 (fine series), and ISO 68-1 standards to ensure a precise fit and reliable engagement across high-capacity industrial metric fastening systems.

Disclaimer: Actual dimensions, including the width across flats (spanner or wrench size), nut height, and thread tolerance may vary depending on the specific manufacturing class and material — always verify with the official product datasheet before use or buying.

Nut internal thread diagram depicting major diameter, minor diameter, and pitch diameter

Nut body diagram depicting width across flats, width across corners, diameter, and thickness or height

M22 x 2.5 Hex Nut – DIN 13-1/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	22	22.585
Pitch Diameter	20.376	20.6
Minor Diameter	19.294	19.744
Thread Pitch	2.5

M22 x 2.0 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	22	22.501
Pitch Diameter	20.701	20.913
Minor Diameter	19.835	20.21
Thread Pitch	2.0

M22 x 1.5 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	22	22.406
Pitch Diameter	21.026	21.216
Minor Diameter	20.376	20.676
Thread Pitch	1.5

M22 x 1.0 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	22	22.304
Pitch Diameter	21.35	21.51
Minor Diameter	20.917	21.153
Thread Pitch	1.0

M22 Hex Nut – DIN 934/ISO 4032 & ISO 8673
Diameter	22	23.7
Width Across Flats	33	34
Width Across Corners	37.29	Not specified
Height / Thickness	18.1	19.4

M22 Thin / Half Nut – DIN 439/ISO 4035 & ISO 8675
Diameter	22	23.8
Width Across Flats	31	32
Width Across Corners	35.03	Not specified
Height / Thickness	9.9	11

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Frequently Asked Questions

What size wrench or spanner do I need for an M22 nut?

An M22 hex nut typically requires a 32 mm wrench or socket (under ISO 4032) or a 34 mm wrench (under the older DIN 934 standard). Due to the extreme torque required for M22 fasteners, industrial-grade impact wrenches or long-handle slugging wrenches are commonly used.

What is a jam nut?

A jam nut is a low-profile hex nut, typically from the Thin Series (DIN 439), that is used to lock a standard nut in place. By tightening a standard nut against a jam nut, you create internal tension between the threads of both nuts and the bolt. This “jams” the assembly together, providing a mechanical lock that prevents loosening caused by vibration or rotation.

Can a Thin Series nut handle the same torque as a Regular nut?

No. Because the Thin Series has fewer threads in contact with the bolt, it has a lower proof load. Subjecting an M22 thin nut to the high clamping forces required in structural or automotive joints is likely to result in thread stripping. For primary structural support, always use a Regular Series nut.

Is M22 a common size for all industries?

M22 is less common than M20 or M24. It is often considered a “non-preferred” size in general engineering, but it remains a staple in heavy-duty vehicle maintenance (like commercial trucks and trailers) and specialized bridge hardware.