Electro Hardware S801-MO4-F16-E Circuit Board Spacer Aluminum

Product Description

The ELECTRO HARDWARE S801-MO4-F16-E is a round, female unthreaded circuit board spacer machined from aluminum grade T-3 to the QQ-A-225A Comp 2 fastener standard. It measures 0.375 inches overall length with a 0.3125 inch outside diameter and a 0.116 inch inside diameter, making it sized for No. 4 screw applications. The uncoated finish leaves the aluminum bare, which suits most standard PCB mounting environments. Electronics assemblers, field service technicians, and panel builders install these spacers to maintain consistent standoff distance between a circuit board and a chassis or mounting surface.

This spacer is suited for use in residential and commercial electronic control assemblies, HVAC control boards, electrical panels, and other applications requiring a precise, repeatable standoff for No. 4 hardware. Its round body profile and female unthreaded bore allow a No. 4 screw to pass through from the board side, securing the stack to the mounting surface below. The close inside diameter tolerance of 0.000 to 0.010 inches and length tolerance of -0.005 to 0.005 inches ensure consistent fit across production and service work.

Key Features

• Female unthreaded round body accepts No. 4 screws for straightforward board standoff assembly
• Overall length of 0.375 inches with a tight length tolerance of -0.005 to 0.005 inches
• Outside diameter of 0.3125 inches and inside diameter of 0.116 inches with ID tolerance of 0.000 to 0.010 inches
• Aluminum grade T-3 construction per fastener standard QQ-A-225A Comp 2
• Uncoated finish for standard PCB and chassis mounting environments
• Inch measurement system; sold individually

Compatibility

Designed as an OEM-style replacement or standard-service spacer for circuit board mounting applications requiring a No. 4 screw size round female unthreaded standoff in the inch measurement system.

Installation Notes

Installation is performed by electronics technicians, HVAC service technicians, or electricians during control board service or assembly work. Power down and de-energize the equipment fully before removing or installing circuit board hardware. Use appropriately sized No. 4 fasteners and avoid overtightening, which can crack the PCB or deform the spacer bore. Follow applicable NEC or equipment manufacturer guidelines for control board service procedures.