Electro Hardware P561M03F21-440 Hex Standoff 4-40 1in Brass

Product Description

The ELECTRO HARDWARE P561M03F21-440 is a female hex circuit board standoff designed to create fixed spacing between PCBs or between a PCB and a mounting surface. Machined from brass with a zinc-plated clear chromate finish that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff accepts a 4-40 threaded fastener on the female end. Overall length is 1 inch with a hex body width across flats of 1/4 inch. The hex profile allows installation and removal with standard wrenches or hex drivers. Electronics technicians, industrial control panel builders, and HVAC controls installers commonly use standoffs of this type when assembling or servicing circuit board mounting assemblies.

This standoff is suited for use in low-voltage control boards, relay panels, and electronic enclosures found in residential and light commercial HVAC equipment, as well as general industrial and electrical control applications. It is appropriate wherever a 4-40 threaded female standoff with a 1-inch overall length is required to maintain board clearance and provide a secure mechanical connection between circuit board layers or between a board and an enclosure panel.

Key Features

• Female 4-40 thread accepts standard 4-40 machine screws for secure board attachment
• 1 inch overall length provides consistent, measurable board-to-surface spacing
• Hex body at 1/4 inch across flats allows wrench or nut-driver installation
• Brass construction with zinc-plated clear chromate finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Length tolerance of -0.005 to +0.005 inches ensures consistent stack-up in multi-board assemblies

Compatibility

Designed as a standard 4-40 female hex standoff for use in any PCB mounting assembly or control enclosure that requires a 1-inch OAL, 1/4-inch hex, 4-40 threaded female standoff in inch measurement.

Installation Notes

Installation is typically performed by electronics technicians or control panel assemblers using a 1/4-inch hex driver or open-end wrench. Always de-energize and discharge any circuits before working on control boards or panel assemblies. Avoid overtightening, as excessive torque can crack PCB mounting holes or damage the board substrate. Follow applicable codes and manufacturer guidelines for control panel assembly and low-voltage wiring.