Electro Hardware 1427M12F21-440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE 1427M12F21-440 is a male-female hex circuit board standoff designed to create fixed spacing between stacked PCBs or between a board and a chassis panel. The body is machined steel with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-S-633 standards, giving it solid corrosion resistance for indoor electronic assemblies. The hex body profile allows standard wrench engagement during installation and removal. Overall length is 7/16 inches (0.4375 inches), with a 1/4-inch hex body and a 3/16-inch male thread projection. Thread size is 4-40, the most common pitch used in light-duty PCB mounting hardware. This standoff is suited for electronics technicians, field service engineers, and industrial maintenance professionals working on control boards and electronic assemblies.

This standoff is used in residential and commercial electronic control panels, HVAC control boards, and general-purpose circuit board mounting applications wherever 4-40 threaded hardware is specified. The male end threads into the receiving board or chassis, while the female end accepts the next board-level fastener, maintaining a consistent stack height equal to the overall standoff length. It is typically installed in environments where boards must be stacked or elevated above a mounting surface for clearance, airflow, or vibration isolation.

Key Features

• 4-40 male-female thread configuration for standard PCB stacking applications
• Hex body shape allows wrench engagement for secure, controlled installation
• Zinc-plated steel construction meets ASTM B633 Type 1 and QQ-S-633 standards
• Overall length of 7/16 inches provides precise board-to-board or board-to-chassis spacing
• Grade 2 steel material with length tolerance of -0.005 to +0.005 inches for consistent fitment
• Body length and thread depth each measure 1/4 inch for balanced male-female engagement

Compatibility

Designed as an OEM-style replacement or standard component for circuit board assemblies using 4-40 threaded hardware in inch-measurement fastener systems.

Installation Notes

Installation is performed by electronics or instrumentation technicians using a hex wrench or nut driver sized to the 1/4-inch width-across-flats hex body. Always de-energize and discharge any capacitors in the circuit board assembly before handling or mounting hardware. Do not overtighten, as 4-40 threads in lightweight PCB materials can strip under excessive torque. Follow applicable assembly drawings and IPC standards for board mounting practices where required.