Electro Hardware S793-M10-F21-I Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S793-M10-F21-I is a round, female unthreaded circuit board spacer designed to maintain precise standoff clearance between a printed circuit board and a mounting surface. Manufactured from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, this spacer measures 0.25 inches overall length, 0.194 inches inside diameter, and 0.3125 inches outside diameter. It is sized for No. 10 screws. Licensed electricians, electronics technicians, and HVAC control board installers use these spacers when securing circuit boards in enclosures, panels, or equipment chassis that require consistent board standoff and grounding isolation.

This spacer is suited for use in residential and light commercial electrical enclosures, HVAC control boards, and industrial panel assemblies where a No. 10 screw pattern is required. Its compact 0.25-inch length makes it appropriate for applications with tight clearance between the circuit board and the mounting plane. The zinc-plated steel construction provides corrosion resistance in typical indoor environments. It is sold individually and can be used wherever a precise, repeatable standoff height is needed during board installation or replacement service.

Key Features

• Female unthreaded body accepts a No. 10 screw for straightforward board mounting
• Grade 2 steel construction meets ASTM B633 and QQ-S-633 Type 1 standards
• Zinc-plated finish provides corrosion resistance for indoor panel applications
• Tight length tolerance of -0.005 to 0.005 inches ensures consistent standoff height
• Inside diameter tolerance of 0.000 to 0.010 inches for controlled fit on mounting hardware
• Round body shape allows uniform load distribution around the board mounting point

Compatibility

Designed as an OEM-style replacement or service spacer for circuit board assemblies requiring a female unthreaded round standoff sized for No. 10 screws with a 0.25-inch overall length.

Installation Notes

Installation should be performed by a qualified electrician or electronics technician. De-energize and lock out the panel or equipment before removing or installing circuit boards. Use a properly sized No. 10 screw and avoid overtightening, which can crack the board substrate or distort the spacer. Follow applicable NEC guidelines when working inside electrical enclosures.