M24 Nut Dimensions: Hex & Thin Series

Q: What size wrench or spanner do I need for an M24 nut?

An M24 hex nut typically requires a 36 mm wrench or socket. The standard width across flats (s) for an M24 nut is 36.00 mm. Due to the extreme torque levels required for M24 fasteners, pneumatic impact wrenches or hydraulic torque tools are often utilized for installation.

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. For M24 fasteners, which are frequently used in safety-critical structural joints, using a thin nut as the primary fastener is highly dangerous as the threads are likely to strip or shear under high tension. Always use a Regular Series nut for primary load-bearing applications.

M24 nut dimensions or sizes are critical for infrastructure projects, heavy machine foundations, and large-scale industrial piping. This size is specifically engineered to mate with fasteners having a 24.00 mm nominal diameter and is available in M24 x 3.0 for the coarse series and M24 x 2.0 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 heavy-duty 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

M24 x 3.0 Hex Nut – DIN 13-1/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	24	24.698
Pitch Diameter	22.051	22.316
Minor Diameter	20.752	21.252
Thread Pitch	3.0

M24 x 2.0 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	24	24.513
Pitch Diameter	22.701	22.925
Minor Diameter	21.835	22.21
Thread Pitch	2.0

M24 x 1.5 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	24	24.417
Pitch Diameter	23.026	23.226
Minor Diameter	22.376	22.676
Thread Pitch	1.5

M24 x 1.0 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	24	24.314
Pitch Diameter	23.35	23.52
Minor Diameter	22.917	23.153
Thread Pitch	1.0

M24 Hex Nut – DIN 934/ISO 4032 & ISO 8673
Diameter	24	25.9
Width Across Flats	35	36
Width Across Corners	39.55	Not specified
Height / Thickness	20.2	21.5

M24 Thin / Half Nut – DIN 439/ISO 4035 & ISO 8675
Diameter	24	25.9
Width Across Flats	35	36
Width Across Corners	39.55	Not specified
Height / Thickness	10.9	12

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Frequently Asked Questions

What size wrench or spanner do I need for an M24 nut?

An M24 hex nut typically requires a 36 mm wrench or socket. The standard width across flats (s) for an M24 nut is 36.00 mm. Due to the extreme torque levels required for M24 fasteners, pneumatic impact wrenches or hydraulic torque tools are often utilized for installation.

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. For M24 fasteners, which are frequently used in safety-critical structural joints, using a thin nut as the primary fastener is highly dangerous as the threads are likely to strip or shear under high tension. Always use a Regular Series nut for primary load-bearing applications.