Value Collection MP39646 Hex Lock Nut 1-1/4-12 Grade 8

Product Description

The VALUE COLLECTION MP39646 is a nylon insert hex lock nut engineered for high-strength fastening applications requiring reliable vibration resistance. Manufactured from Grade 8 steel with a bright, uncoated finish, this nut uses a nylon insert locking mechanism to maintain clamp load under dynamic loads and vibration without the need for thread-locking compounds. It is sized to a 1-1/4-12 UNF thread and measures 1-25/64 inches in height with a 1-13/16 inch width across flats. Electricians, millwrights, and maintenance mechanics install this type of hardware in mechanical assemblies, structural connections, and equipment mounting applications where a secure, reusable fastening solution is required.

This hex lock nut is suited for industrial, commercial, and heavy-duty mechanical installations where a fine-thread, right-hand UNF fastener is specified. The 1-1/4-12 thread pitch is common in precision mechanical assemblies, hydraulic fittings, and structural steel applications where greater thread engagement and load distribution are priorities. It is sold individually and is appropriate for shops and field technicians carrying Grade 8 fastener inventory.

Key Features

• Nylon insert locking style provides vibration-resistant clamping without thread-locking compounds
• Grade 8 steel construction delivers high tensile and proof load capacity
• 1-1/4-12 UNF fine thread for precise engagement and increased clamping force
• Right-hand thread direction conforms to standard installation practices
• Bright, uncoated finish suitable for indoor and protected-environment use
• Inch measurement system; conforms to UNF fastener standard

Compatibility

Designed as a standard UNF replacement or service fastener for applications requiring a 1-1/4-12 Grade 8 nylon insert hex lock nut.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician using the appropriate size wrench or socket matched to the 1-13/16 inch width across flats. Ensure mating threads are clean, undamaged, and free of debris before installation. Nylon insert lock nuts are intended for single-use or limited-reuse service; replace the nut if the nylon insert no longer provides resistance during installation. Do not exceed the torque ratings specified by the equipment manufacturer or applicable fastener standards for Grade 8 UNF hardware.