Electro Hardware 1312M12F21440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE 1312M12F21440 is a male-female hex circuit board standoff designed to create a precise, fixed gap between printed circuit boards or between a board and a mounting surface. It features a 4-40 unified thread on both the male and female ends, a hexagonal body measuring 3/16 inches across the flats, and an overall body length of 15/32 inches (0.4688 inches). Constructed from steel with a zinc-plated finish that meets ASTM B633 Type 1 and QQ-S-633 standards, this standoff provides corrosion resistance alongside reliable mechanical rigidity. Electronics assembly technicians and field service technicians install these in control board assemblies, PCB mounting applications, and enclosure builds.

This standoff is suited for use in low-voltage control boards, HVAC equipment electronic assemblies, electrical enclosures, and general electronics panel builds where a 4-40 threaded male-female configuration is required. The hex body allows tool engagement for tightening without marring the PCB surface. Its inch-system threading and standard hex profile make it a straightforward drop-in component for both OEM production environments and field repair scenarios where board-to-board or board-to-chassis spacing must be maintained consistently.

Key Features

• 4-40 unified thread on both male and female ends for secure board-to-board or board-to-chassis fastening
• Hexagonal body at 3/16 inches across the flats allows wrench or nut driver engagement
• Overall body length of 15/32 inches (0.4688 inches) with a thread depth of 1/4 inch
• Steel construction with zinc-plated finish per ASTM B633 Type 1 and QQ-S-633 for corrosion resistance
• Length tolerance of -0.005 to 0.005 inches for consistent spacing in precision PCB assemblies
• Inch-system measurement; Material Grade 2 steel

Compatibility

Designed as an OEM-style replacement or standard hardware component for circuit board mounting applications requiring a 4-40 male-female hex standoff in inch sizing.

Installation Notes

Installation is performed by electronics assembly technicians or qualified electrical trades workers. Always de-energize the equipment and discharge any stored energy before working on control boards or electronic assemblies. Use an appropriately sized nut driver or hex wrench to engage the standoff body; avoid over-tightening, which can crack PCB mounting holes or strip the 4-40 threads. Follow applicable electrical codes and equipment manufacturer service procedures when replacing or installing standoffs in control panel or board assemblies.