Electro Hardware 1310M12F21440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE 1310M12F21440 is a male-female hex circuit board standoff designed to space and secure printed circuit boards within electronic enclosures and control assemblies. The standoff features a 4-40 unified thread on both ends — a male thread on one side and a female threaded bore on the other — allowing boards to be stacked or mounted at a fixed distance from a chassis. The body measures 0.4063 inches in overall length with a 3/16-inch hex width across flats, making it compatible with standard hex drivers and nut drivers. Constructed from steel with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-S-633 standards, this standoff delivers corrosion resistance appropriate for indoor control panels and circuit board assemblies.

This standoff is used in residential and commercial electrical and HVAC control board assemblies where boards must be elevated from a mounting surface or stacked in a multi-board configuration. Typical applications include furnace control boards, thermostat sub-assemblies, variable frequency drive panels, and general electronic equipment enclosures. The 4-40 thread size is a widely used standard in PCB mounting hardware, making this standoff a common replacement or build component for electrical and controls technicians working on panel-level assemblies.

Key Features

• Male-female hex configuration allows board stacking and chassis-mount in a single fastener
• 4-40 unified thread on both ends for compatibility with standard PCB hardware
• Overall body length of 0.4063 inches with 3/16-inch hex width across flats
• Steel construction with zinc-plated finish per ASTM B633 Type 1 and QQ-S-633
• Thread depth of 1/4 inch on the female end; thread length of 3/16 inch on the male end
• Length tolerance of -0.005 to 0.005 inches for precise board spacing

Compatibility

Designed as a standard 4-40 male-female hex PCB standoff for use in circuit board mounting applications requiring inch-system hardware and zinc-plated steel fasteners.

Installation Notes

Installation is typically performed by electricians or controls technicians during panel assembly or board replacement. Power down and de-energize the control panel fully before handling circuit boards or standoff hardware. Use a properly sized hex driver or nut driver matching the 3/16-inch across-flats dimension to avoid rounding the hex body. Follow applicable NEC guidelines and equipment manufacturer torque recommendations when securing board assemblies within enclosures.