Electro Hardware P405M12F21440 Hex Standoff 4-40 2in

Product Description

The ELECTRO HARDWARE P405M12F21440 is a female hex circuit board standoff designed to space and support PCBs within electronic enclosures and control assemblies. It accepts a 4-40 threaded fastener and provides a 0.25-inch thread depth for secure engagement. The hex body measures 0.1875 inches across flats and runs 2 inches in overall length, giving technicians a reliable, rigid standoff for stacking or elevating boards at a fixed height. Constructed from steel with a clear zinc chromate finish, this standoff meets ASTM B633 Type 1 and QQ-S-633 standards. It is installed by electricians, control-panel builders, and electronics technicians working on board-level assemblies.

This standoff is suited for residential and commercial control panels, HVAC control boards, industrial electronics enclosures, and general PCB mounting applications where a 4-40 thread pattern and a 2-inch overall length are specified. The female thread receives a machine screw from above, allowing the board to be secured at a fixed elevation above the chassis or mounting surface. Single-piece packaging makes it practical for both service work and small-run assembly.

Key Features

• Female 4-40 threaded hex standoff for PCB spacing and support
• 2 inches overall length with 0.25-inch thread depth
• Hex body is 0.1875 inches wide 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 inches for consistent stack height

Compatibility

Designed as an OEM-style replacement or new-installation standoff for any circuit board assembly requiring a 4-40 female hex standoff with a 2-inch overall length in an inch-measurement system.

Installation Notes

Installation is typically performed by licensed electricians or electronics technicians during panel assembly or board-level service. Power down and de-energize the control assembly before handling any circuit boards or standoffs. Use an appropriately sized hex wrench or nutdriver on the 0.1875-inch flats to seat the standoff without over-torquing, which can strip the thread or crack the PCB substrate. Follow applicable electrical codes and the equipment manufacturer's assembly specifications when replacing standoffs in live control panels.