Electro Hardware S509-M04-F16-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S509-M04-F16-H is a round, female unthreaded circuit board spacer machined from aluminum grade T-3 to the QQ-A-225A Comp 2 fastener standard. It measures 0.1875 inches overall length, 0.25 inches outside diameter, and 0.171 inches inside diameter. The uncoated finish and tight length tolerance of -0.005 to 0.005 inches make it suitable for precise PCB standoff applications. Sized for a number 8 screw, this spacer is installed by electronics technicians, electrical assemblers, and field service professionals who need reliable board standoffs in control panels, HVAC control boards, and similar assemblies.

This spacer is used in applications where a circuit board must be held at a fixed distance from a mounting surface without threading. Common install scenarios include residential and commercial HVAC control board assemblies, electrical enclosure PCB mounting, and industrial control panel builds. Its compact 0.1875-inch length is suited for tight board-to-chassis clearances where standard longer spacers would not fit. The aluminum construction keeps weight minimal while providing adequate rigidity for panel-mount environments.

Key Features

• Female unthreaded design accepts a number 8 screw without requiring tapping
• 0.1875 inches overall length with tight tolerance of -0.005 to 0.005 inches
• 0.25 inches outside diameter with 0.171 inches inside diameter and tolerance of 0.000 to 0.010 inches
• Aluminum grade T-3 construction, uncoated, per QQ-A-225A Comp 2 standard
• Round body shape for consistent seating on PCB mounting surfaces
• Inch measurement system; compatible with standard number 8 fastener hardware

Compatibility

Designed as an OEM-style replacement or new-install spacer for circuit board assemblies using number 8 screw hardware in residential and commercial electrical or HVAC control applications.

Installation Notes

Installation is performed by licensed electricians or qualified electronics technicians. Always de-energize and lock out the control panel or circuit board assembly before servicing. Verify the mating screw size is number 8 before installation to avoid damaging the spacer bore. Standard hand tools and a torque-limiting screwdriver are recommended to prevent over-compression of the spacer against the board surface.