Electro Hardware S593-M10-F21-G Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S593-M10-F21-G is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between PCBs and mounting surfaces in electronic assemblies. Manufactured from Grade 2 steel with a zinc-plated finish, this spacer meets ASTM B633 and QQ-S-633 Type 1 specifications. It measures 1.5 inches in overall length with an inside diameter of 0.141 inches and an outside diameter of 0.25 inches, making it compatible with No. 6 screw installations. Length tolerance is -0.005 to 0.005 inches, and inside diameter tolerance is 0.000 to 0.010 inches. Electronics technicians and panel wiring professionals typically install this fastener during PCB mounting in control panels and electronic enclosures.

This spacer is suited for use in residential and commercial electronic control assemblies, including HVAC control boards, electrical panel subassemblies, and industrial PCB mounting applications. The zinc-plated steel construction provides corrosion resistance appropriate for indoor control-panel environments. It is sold individually and ordered in single-unit quantities, making it practical for service replacement or small-run assembly work where exact spacing and fitment are critical.

Key Features

• Female unthreaded round body accepts No. 6 screws for secure PCB standoff mounting
• Grade 2 steel construction with zinc-plated finish per ASTM B633 and QQ-S-633 Type 1
• 1.5-inch overall length with tight length tolerance of -0.005 to 0.005 inches
• Inside diameter of 0.141 inches with tolerance of 0.000 to 0.010 inches for consistent fitment
• Outside diameter of 0.25 inches provides a compact footprint on crowded circuit boards

Compatibility

Designed as an OEM-style replacement or service spacer for PCB standoff applications requiring a No. 6 screw, 0.25-inch OD, female unthreaded round spacer in steel construction.

Installation Notes

Installation is performed by electronics technicians or control-board service professionals. Power down and de-energize all associated control panels and circuit boards before handling or replacing spacers. Standard hand tools are sufficient for installation; avoid over-torquing screws into the unthreaded female bore, as this spacer is designed to provide spacing only and does not provide thread engagement. Verify OAL and screw size compatibility with the target PCB assembly before installation.