Electro Hardware S357M04F16E Round Board Spacer No. 4

Product Description

The ELECTRO HARDWARE S357M04F16E is a round, female unthreaded circuit board spacer machined from aluminum alloy grade T3 to the QQ-A-225A Comp 2 fastener standard. It accepts a No. 4 screw and measures 1.25 inches overall length with a 0.116 inch inside diameter and a 0.1875 inch outside diameter. The spacer carries an uncoated, bright finish and is manufactured to tight tolerances: inside diameter tolerance of 0.000 to 0.010 inches and length tolerance of -0.005 to 0.005 inches. Electronics assemblers, panel builders, and field technicians use this hardware to maintain consistent standoff clearance between a printed circuit board and its mounting surface.

This spacer is appropriate for use in residential and commercial electronic assemblies wherever a No. 4 screw is the fastening element. Common applications include HVAC control boards, electrical enclosures, and any panel assembly requiring a precise, repeatable standoff distance. Its compact round body and lightweight aluminum construction make it well suited for space-constrained PCB layouts. Minimum order quantity is 25 pieces.

Key Features

• Female unthreaded round body accepts No. 4 screw fasteners
• Overall length of 1.25 inches provides consistent standoff clearance
• 0.1875 inch outside diameter with tight length tolerance of -0.005 to 0.005 inches
• Aluminum grade T3 construction — lightweight and corrosion-resistant
• Manufactured to QQ-A-225A Comp 2 fastener standard
• Bright uncoated finish — no coating to interfere with electrical grounding paths

Compatibility

Designed as a standard No. 4 screw circuit board spacer for use in PCB mounting applications across residential and commercial electronic assemblies.

Installation Notes

Installation is performed by electronics assemblers or qualified technicians. Always power down and de-energize the circuit board assembly before installing or replacing spacers. Use hand tools sized for No. 4 hardware to avoid deforming the unthreaded bore. Verify standoff height requirements against board layout specifications before final assembly.