Electro Hardware P545M09F16-440 Female Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE P545M09F16-440 is a female hex circuit board standoff designed to create fixed spacing between PCBs and mounting surfaces or between stacked boards. It accepts a 4-40 threaded fastener on the female end and measures 0.75 inches overall length with a 0.25-inch width across flats on its hex body. Manufactured from 18-8 stainless steel in Grade 303 with a bright anodized finish, this standoff meets QQ-S-763 fastener standards. Electronics assemblers, PCB technicians, and field service professionals working on control boards in HVAC, electrical, and industrial equipment use these standoffs to maintain precise board clearance and secure mounting.

This standoff is suited for residential and commercial applications wherever a 4-40 threaded female hex spacer is required. Typical install scenarios include control board assemblies, instrument panels, enclosure-mounted PCBs, and industrial electronics racks. The 0.75-inch OAL provides clearance appropriate for single-layer board stacking or surface-mount separation. The hex body geometry allows wrench engagement for consistent torque application during assembly.

Key Features

• Female 4-40 thread accepts standard 4-40 machine screws for secure board-to-board or board-to-chassis fastening
• 0.75-inch overall length with a length tolerance of -0.005 to 0.005 inches for precise spacing
• Hex body profile at 0.25 inches width across flats allows wrench or socket engagement
• 18-8 stainless steel Grade 303 construction resists corrosion in humid or mild chemical environments
• Bright anodized finish provides additional surface protection
• Meets QQ-S-763 fastener standard

Compatibility

Designed as a standard 4-40 female hex circuit board standoff suitable for PCB mounting applications requiring a 0.75-inch OAL spacer in inch-measurement assemblies.

Installation Notes

Installation is typically performed by electronics technicians or field service engineers working on control board assemblies. Power down and de-energize all equipment before handling or replacing circuit board hardware. Use an appropriately sized hex wrench or nutdriver matching the 0.25-inch across-flats dimension to seat the standoff without overtightening. Follow applicable assembly drawings and torque guidelines from the equipment manufacturer when securing PCBs.