Electro Hardware S1359-M10-F21-I Round Board Spacer

Product Description

The ELECTRO HARDWARE S1359-M10-F21-I is a round, female unthreaded circuit board spacer designed to maintain precise standoff clearance between a PCB and a mounting surface. Manufactured from Grade 2 steel with a zinc-plated finish conforming to ASTM B633 and QQ-S-633 Type 1, this spacer provides corrosion resistance and dimensional stability in electronic enclosures and control panel assemblies. The spacer measures 0.5 inches overall length with a 0.5-inch outside diameter and a 0.194-inch inside diameter, sized for a No. 10 screw. Technicians and assemblers working on HVAC control boards, electrical panels, and similar equipment rely on this type of hardware for consistent, repeatable board mounting.

This spacer is suited for use in residential and light commercial electronic assemblies where a No. 10 fastener is used to secure a circuit board to a chassis or DIN-mounted enclosure. Typical applications include HVAC control board mounting, electrical panel PCB assemblies, and industrial control enclosures where board-to-surface clearance must be held to a tight tolerance. The female unthreaded bore accepts a No. 10 screw passed through from the board side, making it straightforward to stack or layer boards at a fixed standoff distance.

Key Features

• Female unthreaded design accepts No. 10 screws for simple pass-through mounting
• Grade 2 steel construction with zinc-plated finish meets ASTM B633 and QQ-S-633 Type 1 standards
• 0.5-inch overall length with tight length tolerance of -0.005 to 0.005 inches for consistent standoff height
• 0.194-inch inside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• Round body shape provides uniform contact and load distribution on PCB mounting holes
• Zinc-plated finish resists corrosion in enclosure and panel environments

Compatibility

Designed as a standard No. 10 round female unthreaded circuit board spacer for use in electronic assemblies, control panels, and PCB mounting applications requiring a 0.5-inch standoff height.

Installation Notes

Installation is typically performed by electronics assemblers, electricians, or HVAC technicians during control board servicing or panel assembly. Always de-energize the equipment and discharge any stored energy before handling circuit boards or installing spacers. Use a No. 10 screw of appropriate length to account for the 0.5-inch spacer stack height. Follow applicable NEC guidelines when working inside electrical enclosures.