Electro Hardware S1111-M10-F21-I Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1111-M10-F21-I is a round, female unthreaded circuit board spacer designed to maintain precise clearance between a circuit board and a mounting surface or stacked board assembly. Manufactured from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, it provides corrosion resistance in typical electronics enclosure environments. The spacer measures 1 inch overall length, 0.194 inches inside diameter, and 0.375 inches outside diameter, sized for No. 10 screw hardware. It is installed by electronics assemblers, field technicians, and board-level service personnel working on control panels and enclosures across HVAC, electrical, and industrial applications.

This spacer is suited for residential and commercial control board assemblies where consistent standoff height and secure board positioning are required. It is appropriate for use wherever a No. 10 fastener is specified and a female unthreaded standoff is needed to maintain board-to-surface separation. Common installation scenarios include HVAC control panel boards, electrical enclosure assemblies, and industrial equipment circuit board mounting.

Key Features

• Female unthreaded design accepts No. 10 screws for straightforward board mounting
• Grade 2 steel construction with zinc-plated finish meets ASTM B633 and QQ-S-633 Type 1 standards
• 1 inch overall length with tight length tolerance of -0.005 to 0.005 inches for consistent standoff height
• 0.375 inch outside diameter and 0.194 inch inside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• Round body shape provides uniform contact and stable board support
• Inch measurement system; compatible with standard imperial fastener hardware

Compatibility

Designed as an OEM-style replacement or new-installation standoff for circuit board assemblies that require a No. 10 screw, female unthreaded, round steel spacer with a 1 inch overall length and 3/8 inch outside diameter.

Installation Notes

Installation is typically performed by electronics assemblers or qualified field technicians. Power down and de-energize all equipment fully before removing or installing circuit board hardware. Use appropriately sized No. 10 fasteners and do not overtighten, as unthreaded spacers can shift under excess torque. Follow applicable NEC or equipment manufacturer guidelines for board mounting and enclosure reassembly.