M36 Nut Dimensions: Hex & Thin Series

Q: What size wrench or spanner do I need for an M36 nut?

An M36 hex nut typically requires a 55 mm wrench or socket. The standard width across flats (s) for an M36 nut is 55.00 mm. Due to the extreme torque requirements (often exceeding 2,000 Nm depending on grade), hydraulic torque wrenches or heavy-duty planetary gear multipliers are used 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 M36 fasteners, which are 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.

M36 nut dimensions or sizes are critical for wind turbine bases, bridge structural anchors, and heavy-duty power plant components. This size is specifically engineered to mate with fasteners having a 36.00 mm nominal diameter and is commonly available in M36 x 4.0 for the coarse series.

This charts covers both 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) and ISO 68-1 standards to ensure a precise fit and reliable engagement across heavy-capacity 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

M36 x 4.0 Hex Nut – DIN 13-1/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	36	36.877
Pitch Diameter	33.402	33.702
Minor Diameter	31.67	32.27
Thread Pitch	4.0

M36 x 3.0 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	36	36.698
Pitch Diameter	34.051	34.316
Minor Diameter	32.752	33.252
Thread Pitch	3.0

M36 x 2.0 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	36	36.513
Pitch Diameter	34.701	34.925
Minor Diameter	33.835	34.21
Thread Pitch	2.0

M36 x 1.5 Hex Nut – DIN 13-21/ISO 68-1
Dimension	Size (mm)
Dimension	Min	Max
Major Diameter	36	36.417
Pitch Diameter	35.026	35.226
Minor Diameter	34.376	34.676
Thread Pitch	1.5

M36 Hex Nut – DIN 934/ISO 4032 & ISO 8673
Diameter	36	38.9
Width Across Flats	53.8	55
Width Across Corners	60.79	Not specified
Height / Thickness	29.4	31

M36 Thin / Half Nut – DIN 439/ISO 4035 & ISO 8675
Diameter	36	38.9
Width Across Flats	53.8	55
Width Across Corners	60.79	Not specified
Height / Thickness	16.9	18

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Frequently Asked Questions

What size wrench or spanner do I need for an M36 nut?

An M36 hex nut typically requires a 55 mm wrench or socket. The standard width across flats (s) for an M36 nut is 55.00 mm. Due to the extreme torque requirements (often exceeding 2,000 Nm depending on grade), hydraulic torque wrenches or heavy-duty planetary gear multipliers are used 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 M36 fasteners, which are 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.