Electro Hardware 1325M03F21440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE 1325M03F21440 is a male-female hex circuit board standoff designed to create fixed spacing between stacked PCBs or between a circuit board and a mounting surface. The standoff features a 4-40 thread size with a male thread on one end and a female threaded bore on the other, allowing boards to be fastened and spaced simultaneously. The body is machined from brass and finished with a zinc plating that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards. Overall body length is 0.875 inches with a hexagonal cross-section measuring 0.1875 inches across the flats. Electronics assembly technicians and board-level repair technicians install these standoffs in production and field-service applications.

This standoff is used in electronics assembly and circuit board mounting applications across commercial, industrial, and residential control systems. It is well-suited for securing control boards inside HVAC equipment, electrical enclosures, and similar panels where repeatable board-to-surface spacing is required. The hex profile allows tightening with a standard wrench or nut driver. The male thread on one end engages a receiving nut or threaded hole in the mounting surface, while the female threaded bore accepts a screw from the board above. Minimum order quantity is 10 units.

Key Features

• 4-40 male-female thread configuration for stacking and spacing circuit boards
• Brass construction with zinc plating meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards
• Hexagonal body profile at 0.1875 inches across flats allows wrench or nut driver installation
• Overall body length of 0.875 inches with a thread depth of 0.25 inches on the female end
• Thread length on the male end is 0.1875 inches
• Length tolerance of -0.005 to 0.005 inches for consistent board-level fitment

Compatibility

Designed for use in any application requiring a 4-40 male-female hex standoff with a 0.875-inch body length and 0.1875-inch hex width, including PCB mounting in control panels and electronic enclosures.

Installation Notes

Installation is performed by electronics assembly technicians or qualified service personnel working on circuit board mounting. Power down and de-energize the equipment fully before handling or replacing any circuit board hardware. Use an appropriately sized nut driver or open-end wrench on the hex body to seat the standoff without over-torquing, which can crack PCB mounting holes. Ensure the mating thread and hole pattern match the 4-40 specification before installation.