Electro Hardware S301M04F16E Round Pcb Spacer No. 4 Aluminum

Product Description

The ELECTRO HARDWARE S301M04F16E is a round, female unthreaded circuit board spacer designed to maintain precise standoff distance between a PCB and its mounting surface. Machined from Aluminum Grade T3 per fastener standard QQ-A-225A Comp 2, this spacer measures 0.375 inches overall length with a 0.1875-inch outside diameter and a 0.116-inch inside diameter. The uncoated bright finish leaves the aluminum in its natural state, which is appropriate for most indoor electronic enclosure environments. It accepts a No. 4 screw. HVAC control board technicians, electricians, and electronics assemblers install this type of hardware when mounting PCBs inside equipment panels or control enclosures.

This spacer is suited for residential and commercial applications wherever a No. 4 fastener is used to mount a circuit board with a defined standoff requirement of 0.375 inches. Typical use cases include HVAC control board assemblies, electrical panel sub-assemblies, and industrial enclosure PCB mounting. The compact 0.1875-inch outside diameter makes it appropriate for densely populated boards where clearance between components is limited. It is sold individually but carries a minimum order quantity of 25 units, making it practical for service shops and assembly operations that maintain bench stock of common hardware.

Key Features

• Female unthreaded round body accepts No. 4 screws for straightforward PCB standoff mounting
• Aluminum Grade T3 construction per QQ-A-225A Comp 2 for consistent material quality
• Overall length of 0.375 inches held to a tolerance of -0.005 to 0.005 inches
• Inside diameter tolerance of 0.000 to 0.010 inches for reliable fastener fit
• Bright uncoated finish suitable for standard indoor electronic enclosure environments
• Compact 0.1875-inch outside diameter for use in tight PCB layouts

Compatibility

Designed as an OEM-style replacement or stock hardware component for any circuit board assembly requiring a female unthreaded round spacer sized for a No. 4 screw with a 0.375-inch standoff height in an inch-measurement system.

Installation Notes

Installation is typically performed by licensed electricians or electronics technicians during control board assembly or replacement service. Always de-energize the equipment and discharge any stored electrical energy before handling PCBs or mounting hardware. Use appropriately sized No. 4 fasteners and avoid overtightening, which can crack the PCB substrate or deform the spacer. Follow applicable NEC guidelines when servicing electrical enclosures containing control boards.