Electro Hardware 1431M03F21-440 Hex Standoff 4-40 9/16 in

Product Description

The ELECTRO HARDWARE 1431M03F21-440 is a male-female hex circuit board standoff designed to create precise spacing between PCBs, panels, and chassis in electronics assemblies. Threaded 4-40 on both ends, this standoff accepts a machine screw on the male end and receives a mating screw on the female end, allowing boards to stack securely at a fixed height. The body is machined from brass and finished with a zinc plating that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards. Overall length is 9/16 inch (0.5625 inches), with a 1/4-inch hex body width across flats for easy wrench engagement during installation.

This standoff is used in residential and commercial electronics applications wherever circuit boards must be mounted at a controlled standoff height from a base surface or stacked in multi-board assemblies. Typical install scenarios include control board mounting in HVAC equipment, electrical enclosures, instrumentation panels, and industrial electronics. The inch-measurement system and 4-40 thread size are standard in North American electronic and electromechanical assemblies. Electricians, electronics technicians, and OEM assembly crews regularly specify this hardware for control board service and new builds.

Key Features

• Male-female thread configuration allows board stacking and secure fastening in a single standoff
• 4-40 thread size is a widely used standard in North American PCB and control board assemblies
• Hex body shape allows wrench-driven installation without slipping
• Brass construction with zinc plating resists corrosion and meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards
• Tight length tolerance of plus or minus 0.005 inches ensures consistent board spacing in precision assemblies

Compatibility

Designed as an OEM-style replacement or service standoff for circuit board assemblies using 4-40 inch-series threaded hardware, including control boards in HVAC equipment, electrical enclosures, and industrial panel assemblies.

Installation Notes

Installation is typically performed by electricians, electronics technicians, or HVAC service technicians working on control board assemblies. De-energize all equipment and discharge any stored electrical energy before handling circuit boards or fasteners. A nut driver or small hex wrench sized for 1/4-inch across flats is recommended to seat the standoff without over-torquing the brass body. Follow applicable NEC guidelines and equipment manufacturer instructions when replacing control board hardware in electrical enclosures.