Electro Hardware S1339-M01-F21-K Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1339-M01-F21-K is a round, female unthreaded circuit board spacer designed to maintain precise standoff clearance between a PCB and a mounting surface. Machined from brass and finished with a zinc plating that meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer measures 3/16 inches in overall length with a 1/2 inch outside diameter and a 0.257 inch inside diameter sized to accept a 1/4 inch screw. It is used by electronics assemblers, HVAC controls technicians, and electrical panel fabricators wherever a reliable, corrosion-resistant board standoff is required.

This spacer fits residential and commercial control board assemblies, HVAC circuit board mounting applications, and general electronics enclosure builds. The 1/4 inch thread size is a common fastener standard in control board and panel work, making this spacer a straightforward fit in a wide range of assembly configurations. It ships individually and is suited for both new installations and field-replacement of worn or damaged standoffs on existing boards.

Key Features

• Female unthreaded body accepts a 1/4 inch screw for secure board standoff mounting
• Brass construction with zinc plating meets ASTM B633 and QQ-B-626 Comp 22 Type 1 finish standards
• 3/16 inch overall length with tight length tolerance of -0.005 to 0.005 inches ensures consistent board-to-surface spacing
• 0.257 inch inside diameter with a tolerance of 0.000 to 0.010 inches for reliable fastener fit
• Round body shape with 1/2 inch outside diameter for stable contact footprint on the board surface
• Inch measurement system; compatible with standard imperial fastener tooling

Compatibility

Designed as an OEM-style replacement or new-build component for circuit board assemblies requiring a 1/4 inch female unthreaded round spacer with a 3/16 inch standoff height.

Installation Notes

Installation is typically performed by electronics assemblers or controls technicians. Always power down and de-energize the control board or panel before removing or installing standoff hardware. Use hand tools sized for the 1/4 inch fastener to avoid damaging the brass body or the board mounting hole. Inspect mating surfaces for burrs or debris before seating the spacer to ensure proper length tolerance is maintained.