Electro Hardware P333M12F21440 Hex Standoff 4-40 7/8in

Product Description

The ELECTRO HARDWARE P333M12F21440 is a female hex circuit board standoff used to mount and space printed circuit boards within electronic enclosures and control panels. The standoff features a 4-40 internal thread with a full 7/8-inch thread depth, a hexagonal body measuring 3/16 inch across flats, and an overall length of 7/8 inch. The body is machined from steel and finished with clear zinc chromate plating meeting ASTM B633 Type 1 and QQ-S-633 standards. This type of standoff is installed by electronics assemblers, HVAC control board technicians, and electricians working with panel-mounted circuit boards requiring secure, grounded mechanical spacing.

This standoff is suited for residential and commercial control panel assemblies where PCBs must be held at a fixed height above a mounting surface. Common applications include HVAC control boards, electrical enclosures, relay panels, and other equipment requiring threaded female-threaded spacers to create electrical clearance and mechanical support between a board and its mounting surface. The hex body profile allows a wrench or nut driver to be used during installation for torque control without marring the finish.

Key Features

• 4-40 female thread with full 7/8-inch thread depth for secure board retention
• Hexagonal body profile at 3/16 inch across flats for wrench or nut driver installation
• Steel construction with clear zinc chromate finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-S-633 plating standards
• Overall length of 7/8 inch provides consistent board standoff height
• Length tolerance held to plus or minus 0.005 inch for precise panel assembly

Compatibility

Designed as a standard 4-40 female hex circuit board standoff for use in PCB mounting applications requiring inch-system threaded hardware.

Installation Notes

Installation is typically performed by electronics technicians or licensed electricians during panel assembly or board replacement. Power down and de-energize the control panel completely before removing or installing circuit board standoffs. Use an appropriately sized nut driver or open-end wrench on the hex body to avoid slipping and stripping the finish. Follow applicable NEC guidelines for control panel assembly and maintain required clearances between energized components and the enclosure.