Electro Hardware S513-M01-F21-H Round Board Spacer No. 8

Product Description

The ELECTRO HARDWARE S513-M01-F21-H is a round, female unthreaded circuit board spacer machined from brass and finished with a zinc plate for corrosion resistance. Sized for No. 8 screws, it measures 0.25 inches overall length, 0.25 inches outside diameter, and 0.171 inches inside diameter. This spacer creates a fixed standoff between a printed circuit board and a mounting surface, maintaining clearance for airflow and preventing unintended contact. It meets ASTM B633, QQ-B-626 Comp 22 Type 1 standards. Electronics technicians, HVAC controls installers, and electrical panel assemblers routinely use this type of hardware during board-level service and assembly work.

This spacer is suited for residential and light commercial applications wherever circuit boards require reliable standoff mounting. Typical uses include control board installations in HVAC equipment, electrical enclosures, and industrial panels. The female unthreaded body accepts a No. 8 fastener passed through the board and spacer, then secured on the opposite side. Its compact 0.25-inch length makes it appropriate for low-profile mounting arrangements where board clearance is limited.

Key Features

• Female unthreaded design sized for No. 8 screw fasteners
• 0.25 inches overall length with a length tolerance of -0.005 to 0.005 inches
• 0.171 inches inside diameter with a tolerance of 0.000 to 0.010 inches
• Brass construction with zinc-plated finish for corrosion resistance
• Meets ASTM B633, QQ-B-626 Comp 22 Type 1 fastener standards
• Round body profile for consistent fitment in standard PCB mounting holes

Compatibility

Designed as an OEM-style replacement or service spacer for circuit board assemblies requiring a No. 8 female unthreaded round standoff with a 0.25-inch overall length and 0.25-inch outside diameter.

Installation Notes

Installation is typically performed by electronics technicians or licensed electricians during control board service or panel assembly. De-energize all circuits and discharge any capacitors before handling circuit boards or mounting hardware. Use appropriate ESD precautions when working near sensitive PCB components. Verify fastener size and board hole diameter against the spacer dimensions before installation to ensure proper fit and required board clearance.