Electro Hardware 1443M03F21-440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE 1443M03F21-440 is a male-female hex circuit board standoff designed to create precise spacing and secure mounting between PCBs, panels, and enclosure hardware. Machined from brass with a zinc-plated finish that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff delivers corrosion resistance appropriate for electronics enclosures, control panels, and industrial assemblies. The hex body measures 0.25 inches across flats and provides a wrench-flat grip for controlled torque during installation. Overall length is 15/16 inch (0.9375 inches), with a body length of 3/4 inch and a thread length of 3/16 inch. Thread size is 4-40, a standard used widely in low-voltage control boards and PCB stacking applications.

This standoff is suited for use in residential and commercial control panels, HVAC circuit board assemblies, electrical enclosures, and any application requiring a rigid, threaded spacer between stacked PCBs or a board and a mounting surface. Electricians, electronics technicians, and HVAC service professionals typically install these standoffs when mounting or replacing control boards inside equipment enclosures. The male-female thread configuration allows daisy-chaining or single-layer PCB mounting depending on the assembly requirement.

Key Features

• Male-female hex body design for stackable or single-layer PCB mounting
• 4-40 thread size compatible with standard PCB and panel hardware
• Brass construction with zinc-plated finish per ASTM B633 Type 1 and QQ-B-626 Comp 22
• Hex body profile (0.25 inches across flats) accepts standard nut drivers and wrenches
• Length tolerance of -0.005 to 0.005 inches for precise board spacing
• Inch measurement system; overall length 15/16 inch (0.9375 inches)

Compatibility

Designed as a standard 4-40 male-female hex standoff for use with circuit boards, electrical panels, and enclosures that require inch-series threaded hardware. Verify thread engagement depth and overall standoff length against your specific PCB and enclosure tolerances before installation.

Installation Notes

Install and remove this standoff using a properly sized nut driver or hex wrench matched to the 0.25-inch across-flats hex body. Always de-energize and discharge any control board or panel before working in the enclosure. Avoid over-torquing, as brass hardware is subject to thread damage if excessive force is applied. Follow applicable NEC requirements and equipment manufacturer guidelines when mounting or replacing circuit boards inside energized enclosures.