M52 nut dimensions or sizes are critical for bridge bearing plates, heavy industrial foundation anchors, and large-scale maritime engineering. This size is specifically engineered to mate with fasteners having a 52.00 mm nominal diameter and is available in M52 x 5.0 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 extreme-load 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.
What size wrench or spanner do I need for an M52 nut?
An M52 hex nut typically requires an 80 mm wrench or socket. The standard width across flats (s) for an M52 nut is 80.00 mm. Given the extreme torque requirements—often exceeding 5,000 Nm depending on the bolt grade—hydraulic tensioners or industrial-grade torque multipliers are required for proper 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 extreme vibration or seismic loads.
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 M52 fasteners used in safety-critical structural applications, using a thin nut as the primary fastener is highly dangerous as the threads are likely to strip or fail under tension. Always use a Regular Series nut for primary load-bearing connections.
