Electro Hardware S1055-M10-F21-I Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1055-M10-F21-I is a round, female unthreaded circuit board spacer designed to maintain precise standoff clearance between a PCB and a mounting surface. Constructed from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, it provides corrosion resistance suitable for electronics enclosures. The spacer measures 0.125 inches overall length, 0.194 inches inside diameter, and 0.375 inches outside diameter, sized for No. 10 screws. Electronics assemblers, OEM technicians, and field service technicians typically install these during board mounting operations inside control panels and equipment enclosures.

This spacer is used in residential and commercial electronic assemblies where a No. 10 fastener pattern is required. Common applications include HVAC control board mounting, electrical panel sub-assemblies, and general-purpose PCB standoff installations. The female unthreaded design accepts a No. 10 screw passed through the bore, holding the board at a fixed, consistent height above the mounting chassis. Its compact 0.125-inch length suits low-clearance installations where minimal standoff height is required.

Key Features

• Female unthreaded bore sized for No. 10 screws with inside diameter of 0.194 inches
• Overall length of 0.125 inches with a tight length tolerance of -0.005 to 0.005 inches
• Outside diameter of 0.375 inches with round body profile for stable panel seating
• Grade 2 steel construction with zinc-plated finish per ASTM B633 and QQ-S-633 Type 1
• Inside diameter tolerance of 0.000 to 0.010 inches for consistent fastener fit

Compatibility

Designed as a standard OEM-style circuit board spacer for use with No. 10 screw fasteners in electronics assemblies, control board mounting applications, and panel enclosures requiring a 0.375-inch OD round standoff at 0.125-inch stack height.

Installation Notes

Installation is typically performed by electronics technicians or field service personnel during control board replacement or assembly work. Power down and de-energize all equipment before accessing any circuit board or control enclosure. Use appropriate ESD precautions when handling PCBs. Confirm fastener length accounts for the spacer height to avoid over-compression or insufficient thread engagement.