Electro Hardware S297M04F16E Round Board Spacer No. 4 Aluminum

Product Description

The ELECTRO HARDWARE S297M04F16E is a round, female unthreaded circuit board spacer designed to create a fixed standoff distance between a PCB and a mounting surface or adjacent board. Machined from aluminum grade T3 to the QQ-A-225A Comp 2 fastener standard, this spacer is sized for a No. 4 screw with a 0.116-inch inside diameter and a 0.1875-inch outside diameter. Overall length is 0.3125 inches. The uncoated bright finish leaves the aluminum in its natural state, making it suitable for applications where coating buildup or conductivity interference must be avoided. Electronics assemblers, panel builders, and field technicians working on control boards, relay panels, and low-voltage assemblies use this type of hardware to maintain proper board clearance and reduce vibration transfer.

This spacer is intended for use in circuit board assemblies where a No. 4 fastener is the mounting standard. Typical applications include HVAC control board mounting, electrical enclosure PCB standoffs, and industrial panel assemblies. Its compact 5/16-inch length suits tight-clearance installations where minimal stack height is required. The aluminum construction keeps weight low and resists corrosion in indoor electrical environments. This part is sold individually but carries a minimum order quantity of 10 units, making it appropriate for both repair stock and production assembly use.

Key Features

• Female unthreaded body accepts No. 4 screws with 0.116-inch inside diameter
• Aluminum grade T3 construction per QQ-A-225A Comp 2 fastener standard
• 0.3125-inch overall length with a tight length tolerance of -0.005 to 0.005 inches
• 0.1875-inch outside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• Bright uncoated finish — no coating thickness to account for in stack height calculations
• Round body shape for consistent seating in standard PCB mounting holes

Compatibility

Designed as an OEM-style replacement or new-build component for circuit board assemblies using No. 4 screw mounting hardware in inch-measurement systems.

Installation Notes

Installation is performed by electronics assemblers or technicians during PCB mounting procedures. De-energize all circuits and discharge any capacitors before handling control boards or inserting standoff hardware. Use appropriately sized drivers to avoid deforming the spacer bore or the board mounting hole. Follow applicable electrical enclosure and panel-assembly standards, including relevant NEC guidelines, when integrating PCB standoffs into electrical equipment.