M45 nut dimensions or sizes are critical for heavy-duty anchoring, large-scale industrial pumps, and massive structural framing. This size is specifically engineered to mate with fasteners having a 45.00mm nominal diameter and is commonly available in M45 x 4.5 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 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.
What size wrench or spanner do I need for an M45 nut?
An M45 hex nut typically requires a 70 mm wrench or socket. The standard width across flats (s) for an M45 nut is 70.00 mm. Due to the significant torque required for these large fasteners, installation usually necessitates the use of hydraulic torque equipment or high-capacity planetary gear wrenches.
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 M45 thin nut to the high clamping forces intended for a standard structural joint will likely strip the threads. For primary load-bearing connections, always use a Regular Series nut.
