Electro Hardware 1305M12F21440 Hex Circuit Board Standoff

Product Description

The ELECTRO HARDWARE 1305M12F21440 is a male-female hex circuit board standoff designed to create fixed spacing between printed circuit boards or between a board and a mounting surface. The fastener features a 4-40 threaded male end and a 4-40 threaded female end, allowing boards to be stacked and secured in a single operation. The hex body measures 3/16 inches across flats, giving technicians a standard wrench grip for tightening without slipping. Overall body length is 0.25 inches with a length tolerance of -0.005 to 0.005 inches. The standoff is manufactured from steel with a zinc-plated finish that meets ASTM B633 Type 1 and QQ-S-633 standards for corrosion resistance. Electronics technicians and field service professionals install these in control boards, relay panels, and enclosure assemblies.

This standoff is suited for use in electronics assembly, control panel fabrication, and circuit board mounting applications across HVAC controls, industrial enclosures, and electrical equipment. It is sized for 4-40 machine screw systems using the inch measurement standard. The compact 0.25-inch body length fits tight board stacking configurations where minimal standoff height is required. Installation is typically performed by electronics technicians or controls specialists assembling or servicing printed circuit board assemblies in equipment enclosures.

Key Features

• Male-female hex configuration allows board-to-board stacking with a single fastener
• 4-40 thread size compatible with standard inch-series machine screw hardware
• Hex body profile across 3/16 inches provides wrench grip for secure installation
• Overall body length of 0.25 inches suits compact low-profile board mounting
• Zinc-plated steel construction meets ASTM B633 Type 1 and QQ-S-633 corrosion standards
• Tight length tolerance of plus or minus 0.005 inches ensures consistent board spacing

Compatibility

Designed as a standard inch-series 4-40 male-female hex standoff for use in printed circuit board assemblies and control panel enclosures requiring 0.25-inch board spacing.

Installation Notes

De-energize all equipment and discharge any stored energy before working on circuit board assemblies. Use a nut driver or open-end wrench sized for 3/16-inch hex flats to seat the standoff without over-torquing and stripping the 4-40 threads. Follow the equipment manufacturer's assembly procedures and any applicable NEC requirements for enclosure work when installing or replacing control board hardware.