Electro Hardware P309M09F16440 Hex Standoff 4-40 1/2in Ss

Product Description

The ELECTRO HARDWARE P309M09F16440 is a female hex circuit board standoff designed to create precise spacing between PCBs and mounting surfaces in electronic assemblies. Machined from 303 stainless steel with a plain bright finish, this fully threaded standoff accepts a 4-40 thread and measures 0.5 inches overall length with a 3/16-inch width across flats. The female threading runs the full 0.5-inch thread depth, providing maximum thread engagement for secure board retention. It meets QQ-S-763 fastener standards and suits applications where corrosion resistance and dimensional consistency are required.

This standoff is used in control board assemblies, enclosures, and panel-mount electronics found in HVAC control systems, electrical panels, and industrial equipment. It is appropriate for both original equipment assembly and field service replacement when a board requires remounting or repositioning. The 4-40 thread size and 1/2-inch OAL make it a common choice for lightweight PCB stacking and standoff applications in tight enclosure spaces. Installation is typically performed by electronics technicians, electricians, or HVAC controls specialists during board swap or panel build work.

Key Features

• Female 4-40 thread with full 0.5-inch thread depth for maximum engagement
• 303 stainless steel construction meets QQ-S-763 fastener standard
• Hex body shape at 3/16 inches across flats allows wrench or nut-driver installation
• Plain bright finish — no coating to interfere with ground paths or dimensional tolerances
• Fully threaded body for consistent standoff height and PCB alignment

Compatibility

Designed as a standard 4-40 female hex circuit board standoff for use in PCB mounting and panel assembly applications requiring a 0.5-inch board-to-surface spacing with stainless steel corrosion resistance.

Installation Notes

Install using a properly sized hex wrench or nut driver sized for 3/16-inch flats. De-energize all circuits and discharge any capacitors on the board before removing or installing standoffs. Do not overtighten — snug the standoff to seat the hex body flush against the mounting surface without stressing the PCB. Follow applicable assembly drawings and IPC standards for torque guidance on small-thread fasteners.