Electro Hardware S289M10F21C Circuit Board Spacer Steel

Product Description

The ELECTRO HARDWARE S289M10F21C is a round, female unthreaded circuit board spacer designed to create a fixed standoff distance between a PCB and a mounting surface. Machined from Grade 2 steel with a zinc-plated finish conforming to ASTM B633 and QQ-S-633 Type 1, this spacer provides corrosion resistance in typical indoor control-board environments. It measures 3/16 inches overall length (OAL), 3/16 inches outside diameter (OD), and 0.089 inches inside diameter (ID), sized for a No. 2 screw. Electricians, HVAC technicians, and electronics assembly techs use this type of hardware when mounting control boards inside equipment enclosures.

This spacer is suited for residential and light commercial applications wherever a No. 2 screw pattern circuit board mount is required. Typical install scenarios include PCB standoff mounting inside HVAC control panels, electrical enclosures, and other equipment requiring precise board-to-chassis clearance. Its compact 3/16-inch profile makes it appropriate for low-profile board assemblies where space is constrained.

Key Features

• Female unthreaded round body accepts No. 2 screw for secure two-point board mounting
• Grade 2 steel construction for reliable mechanical support in enclosure environments
• Zinc-plated finish meets ASTM B633 and QQ-S-633 Type 1 for corrosion resistance
• 3/16 inches OAL provides consistent standoff height between PCB and mounting surface
• Inside diameter tolerance of 0.000 to 0.010 inches and length tolerance of -0.005 to 0.005 inches for consistent fitment
• Inch measurement system; UNSPSC Code 31161816

Compatibility

Designed as an OEM-style replacement or general-use standoff spacer for circuit board assemblies requiring a No. 2 screw, female unthreaded, round spacer with a 3/16-inch OAL and OD in inch-measurement applications.

Installation Notes

Installation is performed by qualified electronics assembly technicians or licensed trades during control board service or panel assembly. Always de-energize and lock out the equipment before accessing any circuit board or internal enclosure hardware. Use the correct No. 2 screw driver or driver bit to avoid stripping the mating fastener. Do not overtighten the screw into the unthreaded female bore, as this spacer relies on the fastener for clamping force only.