Electro Hardware 1311M03F21440 Hex Board Standoff 4-40

Product Description

The ELECTRO HARDWARE 1311M03F21440 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs, panels, and chassis surfaces in electronic assemblies. The body is machined from brass with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards. It measures 7/16 inches in overall body length with a 3/16-inch hex width across flats and uses a standard 4-40 thread on both the male post and female threaded bore. This standoff is installed by electronics technicians, controls panel builders, and HVAC equipment assemblers working on low-voltage circuit board mounting applications.

This standoff suits residential and commercial electronic control panel assemblies where consistent PCB spacing and secure mechanical support are required. It is commonly used in HVAC control boards, instrumentation enclosures, and industrial electronics where brass construction provides corrosion resistance and reliable thread engagement. The zinc plating adds a secondary layer of protection against oxidation. Installation typically involves stacking multiple boards in a chassis or DIN-mount enclosure using standard 4-40 machine screws.

Key Features

• Male-female hex configuration allows stackable, multi-board mounting arrangements
• Brass construction with zinc-plated finish meets ASTM B633 Type 1 and QQ-B-626 Comp 22
• 4-40 thread size on both ends for compatibility with standard 4-40 machine screws
• 7/16-inch body length with tight length tolerance of -0.005 to 0.005 inches
• Hex body shape allows wrench or hex-driver installation for consistent torque

Compatibility

Designed for use with standard 4-40 machine screws in PCB and circuit board mounting applications where a 7/16-inch standoff height is specified.

Installation Notes

Installation is performed by electronics technicians or controls panel builders using a hex driver or small wrench sized for 3/16-inch flats. Power down all circuits and discharge any capacitors before working on or near mounted circuit boards. Avoid overtightening, which can strip the 4-40 threads in the female bore or crack solder joints on nearby PCB components. Follow applicable assembly standards for PCB mounting clearances in enclosed control panels.