M64 nut dimensions or sizes are critical for offshore oil platforms, heavy bridge abutments, and large-scale industrial press foundations. This size is specifically engineered to mate with fasteners having a 64.00 mm nominal diameter and is commonly available in M64 x 6.0 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 M64 nut?
An M64 hex nut typically requires a 95 mm wrench or socket. The standard width across flats (s) for an M64 nut is 95.00 mm. At this scale, manual wrenching is no longer feasible; installation requires the use of hydraulic bolt tensioners or high-capacity hydraulic torque wrenches to reach the necessary clamping force.
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-level structural movements.
Can a Thin Series nut handle the same torque as a Regular nut?
No. Because the Thin Series has significantly fewer threads in contact with the bolt, it has a lower proof load. For M64 applications—which usually involve critical infrastructure—using a thin nut as the primary fastener is unsafe as the threads are likely to strip or fail under massive tension. Always use a Regular Series nut for primary structural connections.
