Electro Hardware P325M03F21440 Female Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE P325M03F21440 is a female hex circuit board standoff designed to mount and space printed circuit boards within electronic enclosures and control assemblies. This fully threaded standoff accepts a 4-40 machine screw thread and provides a 3/4 inch overall length with a matching 3/4 inch thread depth, allowing full thread engagement across the entire body. The hexagonal body measures 3/16 inches across flats, providing a clean wrench grip for installation. Manufactured from brass with a clear zinc chromate finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, the P325M03F21440 delivers reliable corrosion resistance and dimensional stability in light-duty board mounting applications.

This standoff is used in residential and commercial electronic control assemblies, HVAC control boards, low-voltage circuit board enclosures, and general electrical equipment where PCB spacing and secure mounting are required. The female thread configuration accepts a mating screw from above while threading into a base panel or chassis below, creating a precise and stable standoff column. Technicians working on control board replacements or custom panel builds in HVAC, electrical, and instrumentation applications will find this a standard fit for 4-40 threaded board mounting layouts.

Key Features

• Female 4-40 threaded body — fully threaded with 3/4 inch thread depth for maximum engagement
• Hexagonal body shape, 3/16 inches across flats — compatible with standard nut drivers and hex keys
• Brass construction with clear zinc chromate finish for corrosion resistance in control enclosures
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 fastener standards
• 3/4 inch overall length provides consistent PCB standoff height
• Length tolerance of -0.005 to +0.005 inches for consistent stacking in multi-board assemblies

Compatibility

Designed as an OEM-style replacement or new-installation standoff for circuit board assemblies using 4-40 threaded hardware in inch-measurement fastener systems.

Installation Notes

Installation is performed by electricians, electronics technicians, or HVAC service professionals during control board mounting or panel fabrication. De-energize and lock out all power to the control assembly before servicing any circuit board hardware. Use a appropriately sized nut driver or hex wrench matched to the 3/16 inch across-flats dimension to avoid rounding the hex body. Follow applicable NEC guidelines and equipment manufacturer torque recommendations when securing standoffs in control enclosures.