Electro Hardware 1307M12F21440 Hex Board Standoff 4-40

Product Description

The ELECTRO HARDWARE 1307M12F21440 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs and mounting surfaces in electronic assemblies. This standoff features a 4-40 unified coarse thread with a male end on one side and a female threaded bore on the other, allowing boards to be stacked or mounted at a consistent 5/16 inch overall body length. The hex body measures 3/16 inches across flats for wrench engagement during installation. Finished in zinc plating per ASTM B633 Type 1 and QQ-S-633, the steel construction resists corrosion in standard indoor electronic enclosure environments. Technicians working on control boards in HVAC equipment, electrical panels, or industrial assemblies will recognize this as a standard hardware component.

This standoff is used wherever circuit boards require secure, elevated mounting within an enclosure or chassis. Common applications include HVAC control board assemblies, electrical panel sub-assemblies, industrial control enclosures, and general electronics manufacturing. The 4-40 thread size is one of the most widely used small-fastener thread standards in North American electronics assembly. The male-female configuration allows daisy-chaining of multiple standoffs or direct fastening of a mating screw to secure a board. It is sold individually but carries a minimum order quantity of 10 units.

Key Features

• Male-female hex body allows board stacking and secure PCB mounting in a single fastener
• 4-40 thread on both male stud and female bore for compatibility with standard 4-40 machine screws
• 5/16 inch overall body length with a length tolerance of -0.005 to 0.005 inches
• 3/16 inch width across flats sized for standard hex drivers and wrenches
• Zinc-plated steel construction meets ASTM B633 Type 1 and QQ-S-633 finish standards
• Hex body shape provides positive tool engagement and prevents rotation during assembly

Compatibility

Designed as a standard 4-40 male-female hex standoff for use in circuit board mounting applications requiring a 5/16 inch standoff height and 3/16 inch hex body in inch-measurement fastener systems.

Installation Notes

Installation is performed by technicians assembling or servicing electronic control boards, typically using a hex driver or small open-end wrench sized for the 3/16 inch flats. Always de-energize and discharge any capacitors in the assembly before handling circuit boards or mounting hardware. Use care not to overtighten, as the 4-40 thread engages small clearance holes and overtorquing can strip threads or crack board material. Follow applicable assembly documentation and ESD precautions when handling populated circuit boards.