Electro Hardware P309M12F21256 Hex Standoff 2-56 1/2 in

Product Description

The ELECTRO HARDWARE P309M12F21256 is a female hex circuit board standoff designed to mount and space printed circuit boards within electronic enclosures and assemblies. It features a 2-56 female thread, a 0.5 inch overall length, and a 3/16 inch (0.1875 inch) width across flats. Constructed from steel with a clear zinc chromate finish meeting ASTM B633 Type 1 and QQ-S-633 standards, this standoff provides reliable corrosion resistance and electrical isolation spacing. The fully threaded body runs the full 1/2 inch depth, allowing a mating screw to engage the complete thread length. Licensed electricians, electronics technicians, and control board assemblers install this hardware in both commercial and industrial applications.

This standoff is suited for PCB mounting applications where a female threaded receptacle is needed on one end to accept a machine screw. It is commonly used in control panels, HVAC control board assemblies, electrical enclosures, and other electronic equipment where secure, repeatable board-to-chassis or board-to-board spacing is required. The hex body allows for easy installation and removal with a standard wrench or hex driver. Its compact size makes it appropriate for densely populated PCB layouts where space is limited.

Key Features

• 2-56 female thread with 1/2 inch full thread depth for maximum fastener engagement
• Hex body profile at 3/16 inch width across flats for wrench-driven installation
• Steel construction with clear zinc chromate finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-S-633 finish standards
• Length tolerance of -0.005 to 0.005 inch for consistent board spacing
• Inch measurement system; Material Grade 2 steel

Compatibility

Designed as an OEM-style replacement or standard component for PCB mounting applications requiring a 2-56 female hex standoff with a 1/2 inch overall length in inch-measurement fastener systems.

Installation Notes

Installation is performed by electronics technicians or licensed electricians during control board assembly or panel wiring. Always de-energize the equipment and discharge any capacitors before working on circuit board assemblies. Use an appropriately sized hex wrench or nut driver matched to the 3/16 inch flats to avoid rounding the hex body. Do not overtighten mating screws, as the 2-56 thread is fine and subject to stripping if torque is not controlled.