Electro Hardware S577-M07-F16-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S577-M07-F16-H is a round, female unthreaded circuit board spacer designed to create a fixed standoff gap between a printed circuit board and a mounting surface or secondary board. Machined from 18-8 and 303 stainless steel to the QQ-S-763 fastener standard, it delivers corrosion resistance and dimensional consistency in demanding environments. The spacer accepts a No. 8 screw, measures 1.25 inches overall length with an inside diameter of 0.171 inches and an outside diameter of 0.25 inches, and ships uncoated. Electricians, electronics technicians, and HVAC control board installers rely on this type of hardware when precise board-to-chassis clearance is required.

This spacer suits residential and commercial applications where circuit boards must be mounted with a consistent air gap for thermal management or electrical isolation. Typical use cases include HVAC control board assemblies, panel-mounted relay boards, and industrial enclosure PCB installations. The stainless steel construction makes it appropriate for environments with elevated humidity or moderate chemical exposure where carbon steel hardware would be a liability.

Key Features

• Female unthreaded body accepts a No. 8 screw for straightforward board mounting
• 18-8 and 303 stainless steel construction meets QQ-S-763 fastener standard
• 1.25-inch overall length provides a defined standoff between board and mounting surface
• 0.25-inch outside diameter and 0.171-inch inside diameter with tight tolerances (inside diameter tolerance 0.000 to 0.010 inches, length tolerance -0.005 to 0.005 inches)
• Uncoated finish - no coating thickness variation to affect dimensional fit
• Round body shape for uniform fitment in standard circuit board mounting hole patterns

Compatibility

Designed as a standard-dimension replacement or new-installation spacer for circuit board assemblies using No. 8 screw hardware in inch-measurement systems.

Installation Notes

Installation should be performed by a qualified electrician or electronics technician with power fully removed from the assembly before handling any circuit board. Use a correctly sized No. 8 fastener and avoid overtightening, which can crack PCB mounting pads. Follow applicable NEC guidelines when installing or servicing control boards within electrical enclosures.