Electro Hardware P421M06F16440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE P421M06F16440 is a female hex circuit board standoff machined from aluminum alloy and designed to create precise, rigid spacing between PCB layers or between a board and a chassis. This standoff accepts a 4-40 threaded fastener on both the mounting end and the interior female thread, with a 1/4-inch thread depth. The overall length is 2-1/4 inches and the hex body measures 3/16 inches across flats, giving technicians a reliable wrench grip during installation. The plain, bright uncoated finish meets QQ-A-225A Comp 2 material standards. Licensed electricians, electronics technicians, and control-board service professionals install these fasteners in panel assembly and board-mounting applications.

This standoff is suited for residential and commercial electronic enclosure assemblies, control panel builds, and circuit board stacking arrangements where consistent board separation and secure mechanical attachment are required. The 4-40 thread size is a common pitch in light-duty PCB mounting applications across HVAC control boards, electrical panels, and industrial electronics. The aluminum construction keeps weight low while providing adequate rigidity for most indoor panel environments.

Key Features

• Female hex body with 4-40 internal thread and 1/4-inch thread depth for secure fastener engagement
• Overall length of 2-1/4 inches provides reliable PCB standoff spacing
• 3/16-inch hex width across flats allows standard nut driver or hex wrench installation
• Aluminum construction per material grade T3 keeps weight minimal without sacrificing structural integrity
• Plain bright uncoated finish meets QQ-A-225A Comp 2 specification
• Length tolerance of -0.005 to +0.005 inches supports consistent board alignment across multi-standoff layouts

Compatibility

Designed as a standard 4-40 female hex aluminum standoff for use in circuit board mounting, panel assembly, and PCB stacking applications requiring a 2-1/4-inch OAL spacer.

Installation Notes

Installation is performed by electronics technicians or licensed electricians during panel assembly or control board service. De-energize all circuits and discharge any capacitive components before working inside an enclosure. Use a correctly sized nut driver or hex wrench matched to the 3/16-inch flats to avoid stripping the aluminum hex body. Do not over-torque; aluminum threads are susceptible to galling and cross-threading if fasteners are driven with excessive force.