Electro Hardware P509M09F16-440 Female Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE P509M09F16-440 is a female hex circuit board standoff designed to create fixed spacing between PCBs, mounting plates, and enclosure panels in electronic assemblies. The fastener accepts a 4-40 threaded screw on both ends and measures 3/16 inches (0.1875 inches) overall length with a 1/4 inch (0.2500 inches) width across the hex flats. Constructed from 18-8 and Grade 303 stainless steel with an anodized bright finish, it meets the QQ-S-763 federal specification for stainless steel fasteners. Electronics assemblers, panel builders, and field technicians use this standoff wherever corrosion resistance and dimensional precision are required in tight board layouts.

This standoff is suited for residential and commercial electronic control assemblies, instrumentation panels, and circuit board mounting applications where a compact, low-profile hex spacer is required. The 4-40 thread size is common in lightweight PCB mounting, telecom enclosures, test equipment chassis, and HVAC control board assemblies. Its short 3/16-inch body length makes it appropriate for stacked-board configurations with minimal clearance requirements.

Key Features

• Female 4-40 threaded hex standoff for PCB-to-panel or board-to-board spacing
• 3/16 inches (0.1875 inches) overall length with tight length tolerance of -0.0050 to +0.0050 inches
• 1/4 inch (0.2500 inches) width across hex flats for standard hex driver engagement
• 18-8 and Grade 303 stainless steel construction for corrosion resistance
• Anodized bright finish meets QQ-S-763 federal fastener specification
• Hex body shape allows torque application without slipping during installation

Compatibility

Designed as an OEM-style replacement or new-installation standoff for 4-40 threaded circuit board mounting applications requiring a female hex spacer in stainless steel construction.

Installation Notes

Installation is performed by electronics assemblers or licensed technicians working on control boards and panel assemblies. Always de-energize and discharge the equipment before handling PCBs or fasteners. Use a hex nut driver or socket sized to 1/4 inch across flats to seat the standoff without over-torquing, which can crack board mounting holes. Follow applicable IPC assembly standards for PCB hardware installation torque guidelines.