Electro Hardware 1451M03F21-440 Hex Board Standoff 4-40

Product Description

The ELECTRO HARDWARE 1451M03F21-440 is a male-female hex circuit board standoff designed to create fixed spacing between printed circuit boards and mounting surfaces or between stacked boards. The hex body provides a secure grip for installation with standard hex drivers or wrenches. Machined from brass with a zinc-plated finish that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff delivers corrosion resistance suitable for electronics enclosures and panel assemblies. The overall length is 1.1875 inches with a 1/4 inch width across flats, a 1 inch body length, and a 3/16 inch thread length on the male end. Thread size is 4-40.

This standoff is used in electronics assembly, control panel fabrication, and PCB mounting applications across residential and commercial HVAC controls, electrical enclosures, and industrial equipment. The male-female configuration allows standoffs to be stacked or used as a single spacer between a board and a chassis. Electronics technicians, panel builders, and field service techs working on control board installations will encounter this hardware in both OEM repair and custom assembly scenarios.

Key Features

• 4-40 male-female thread configuration for stacking or single-tier PCB mounting
• Hex body shape allows torque application with standard hex tools without slipping
• Brass construction with zinc-plated finish meets ASTM B633 Type 1 and QQ-B-626 Comp 22
• Overall length of 1.1875 inches with a 1 inch hex body and 3/16 inch male thread length
• 1/4 inch width across flats compatible with common hex drivers and nut drivers
• Thread depth of 1/4 inch on the female end provides secure board engagement

Compatibility

Designed for use in 4-40 threaded PCB mounting applications where a hex male-female standoff is required. Suitable for circuit board assemblies using standard inch-series 4-40 hardware.

Installation Notes

Installation is performed by electronics technicians, panel builders, or HVAC control board service technicians. Always de-energize the equipment and discharge any capacitors before working inside electrical enclosures or on control boards. Use a correctly sized hex driver or nut driver matching the 1/4 inch across-flats dimension to avoid rounding the hex body. Do not overtighten — brass fasteners are softer than steel and can strip at the thread under excessive torque.