Electro Hardware P437M12F21440 Hex Standoff 4-40 2.5in

Product Description

The ELECTRO HARDWARE P437M12F21440 is a female hex circuit board standoff designed to mount and space PCBs within electronic enclosures, control panels, and equipment chassis. Threaded 4-40 female on both ends, it accepts machine screws to secure a board at a fixed standoff height. The hex body measures 3/16 inches across flats, giving a wrench or nut driver a clean seat for installation without marring the body. Overall length is 2.5 inches with a 1/4 inch thread depth at each end. Constructed from steel with a clear zinc chromate plating per ASTM B633 Type 1 and QQ-S-633, it provides corrosion resistance suitable for indoor electrical and electronic assemblies. Electricians, control panel builders, and electronics technicians are the typical installers.

This standoff is used wherever a circuit board must be held at a fixed height above a mounting surface or stacked against another board in a chassis. Common applications include HVAC control board mounting, industrial control enclosures, electrical panel assemblies, and general PCB sub-assemblies requiring a steel fastener with corrosion-resistant finish. The 4-40 thread size is a standard fine-pitch size widely used in light-duty PCB mounting applications across residential and commercial electronic systems.

Key Features

• Female 4-40 threaded hex standoff for PCB mounting and spacing
• 2.5 inch overall length provides fixed board clearance in panel assemblies
• 3/16 inch hex body width across flats for wrench or nut driver installation
• 1/4 inch thread depth at each end for secure fastener engagement
• Steel construction with clear zinc chromate plating per ASTM B633 Type 1 and QQ-S-633
• Hex body shape prevents rotation during assembly

Compatibility

Designed as an OEM-style replacement or new-install standoff for PCB mounting applications using 4-40 machine screws in electronic enclosures and control panel assemblies.

Installation Notes

Installation is performed by electronics technicians, control panel builders, or licensed electricians. De-energize and lock out the panel or equipment before mounting or removing circuit boards. Use a 3/16 inch nut driver or hex wrench to drive the standoff into threaded inserts or mounting hardware without over-torquing the hex body. Follow NEC requirements for panel and enclosure work when installing within listed electrical equipment.