Electro Hardware S561-M04-F16-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S561-M04-F16-H is a round, female unthreaded circuit board spacer machined from T3-grade aluminum. It measures 1 inch overall length (OAL) with an inside diameter of 0.171 inches and an outside diameter of 0.25 inches. Designed to accept a Number 8 screw, this spacer maintains consistent standoff height between a circuit board and its mounting surface. It carries a bright, uncoated finish and conforms to fastener standard QQ-A-225A Comp 2. Electronics assemblers, control board technicians, and field service pros use this part when precise board-to-chassis clearance is required in HVAC control panels, electrical enclosures, and similar assemblies.

This spacer is suited for use in residential and light commercial control board assemblies where a Number 8 thread size and a 0.25-inch OD profile are specified. Typical applications include PCB mounting in furnace control panels, air handler electrical boxes, and other enclosures that require a low-profile aluminum standoff. Its uncoated aluminum construction makes it appropriate for dry, indoor environments where corrosion exposure is minimal.

Key Features

• Female unthreaded body accepts Number 8 screws for secure PCB standoff mounting
• 1 inch OAL with tight length tolerance of -0.005 to 0.005 inches for consistent stack height
• 0.171 inch inside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• 0.25 inch outside diameter in a round body profile
• T3-grade aluminum construction - lightweight, non-magnetic, and dimensionally stable
• Conforms to QQ-A-225A Comp 2 fastener standard
• Bright, uncoated finish for use in clean, dry enclosures

Compatibility

Designed as a standard-dimension Number 8 round female unthreaded circuit board spacer for use in PCB mounting applications requiring a 0.25-inch OD and 1-inch OAL aluminum standoff.

Installation Notes

Installation is typically performed by electronics technicians or qualified service personnel during control board assembly or replacement. Power down and de-energize all equipment before accessing any control board or electrical enclosure. Verify that the mating screw size is Number 8 and that the mounting hole pattern in the board and chassis matches the spacer OD and ID before installation. Do not overtighten fasteners, as unthreaded aluminum spacers can deform under excessive clamping force.