Electro Hardware P309M19F16440 Hex Standoff 4-40 Nylon

Product Description

The ELECTRO HARDWARE P309M19F16440 is a female hex circuit board standoff designed to create precise spacing between PCBs and mounting surfaces. Machined from nylon with a plain, uncoated finish, this standoff features a 4-40 thread size, a 0.5 inch overall length, and a 3/16 inch (0.1875 inch) width across flats. The hex body shape allows standard wrench engagement for secure, consistent torque without specialized tools. With a tensile strength of 16,500 psi and compliance with MIL-P-17091B, it meets demanding electrical and industrial fastener standards. Licensed electricians, electronics technicians, and PCB assembly professionals install this type of hardware in control boards, enclosures, and panel assemblies.

This standoff is suited for residential and commercial electronic assemblies where nylon insulating properties are required to prevent electrical conductivity between board layers or mounting chassis. It is fully threaded with a 0.5 inch thread depth, accepting 4-40 machine screws on the female end. Typical applications include control board mounting in HVAC equipment, electrical enclosures, and industrial electronics where lightweight, non-conductive spacing hardware is specified. The plain finish is appropriate for dry indoor environments where corrosion resistance from metal coatings is not required.

Key Features

• Female hex body accepts 4-40 machine screws for double-sided PCB stacking or panel mounting
• Nylon construction provides electrical insulation between board and chassis
• 0.5 inch overall length with full 0.5 inch thread depth for maximum thread engagement
• 3/16 inch (0.1875 inch) hex width across flats allows standard wrench or nut driver installation
• Tensile strength of 16,500 psi meets MIL-P-17091B fastener standard
• Plain uncoated finish suitable for dry indoor electronic assembly environments

Compatibility

Designed as an OEM-style replacement or new-installation standoff compatible with circuit boards and mounting panels using 4-40 threaded fastener patterns.

Installation Notes

Installation is performed by electronics technicians or licensed electricians working on control boards and panel assemblies. Always de-energize and discharge any capacitors on the circuit board before handling PCB hardware. Use a properly sized nut driver or wrench matching the 3/16 inch hex profile to avoid stripping the nylon body. Do not over-torque nylon standoffs, as the material is subject to cracking under excessive clamping force.