Electro Hardware S505-M04-F16-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S505-M04-F16-H is a round, female unthreaded circuit board spacer machined from aluminum alloy grade T-3 to QQ-A-225A Comp 2 specification. It provides a fixed standoff gap between a printed circuit board and its mounting surface, keeping the board clear of chassis contact and reducing the risk of shorts. With an overall length of 0.125 inches, an outside diameter of 0.25 inches, and an inside diameter of 0.171 inches, this spacer is sized for number 8 screw installations. The uncoated aluminum finish keeps weight minimal while offering adequate corrosion resistance in controlled environments. Electronics assemblers and field technicians handling control boards in HVAC equipment, electrical enclosures, and industrial panels are the primary installers.

This spacer is suited for use in residential and commercial control board assemblies wherever a number 8 fastener is used to mount a PCB. Common applications include HVAC control boards, variable-speed drive enclosures, relay panels, and other low-voltage electronics assemblies that require a precise, rigid standoff. The compact 0.125-inch length makes it appropriate for tight board-to-chassis clearances where longer standoffs would interfere with adjacent components or wiring.

Key Features

• Female unthreaded round body accepts a number 8 screw for simple PCB mounting
• Overall length of 0.125 inches maintains consistent board standoff height
• Outside diameter of 0.25 inches and inside diameter of 0.171 inches with a tolerance of 0.000 to 0.010 inches
• Aluminum grade T-3 construction per QQ-A-225A Comp 2 for consistent machining quality
• Uncoated finish suitable for dry, controlled-environment installations
• Length tolerance of -0.005 to 0.005 inches ensures predictable stacking in multi-spacer assemblies

Compatibility

Designed as an OEM-style replacement or new-installation component for circuit board mounting applications requiring a number 8 screw, female unthreaded round spacer in the inch measurement system.

Installation Notes

Installation is performed by electronics technicians or qualified field service personnel. De-energize and lock out all power to the control panel or circuit board assembly before handling any PCB hardware. Use a torque-limiting driver appropriate for number 8 fasteners to avoid cracking the board or deforming the spacer. Verify standoff height requirements against the specific board and chassis drawing before selecting spacer quantity or stack configuration.