Electro Hardware MMF1821M09F16M4 Hex Standoff M4x0.7

Product Description

The ELECTRO HARDWARE MMF1821M09F16M4 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs, mounting panels, or electronic enclosures. Machined from 303-grade stainless steel with a bright, uncoated finish, it meets the QQ-S-763 federal specification for stainless steel fasteners. The standoff features an M4 x 0.7 thread on both the male and female ends, a hex body measuring 6 mm across flats, an overall length of 24.53 mm (approximately 0.966 inches), and a body length of 15.00 mm. Electronics technicians and assembly professionals use these standoffs during PCB mounting, chassis assembly, and equipment builds where corrosion resistance and precise board separation are required.

This standoff is suited for metric-threaded PCB and panel assemblies in commercial electronics, industrial controls, HVAC control boards, and electrical enclosures. The male-threaded post engages a receiving panel or lower board while the female-threaded bore accepts the fastener for the upper board, allowing stackable or layered mounting configurations. Its stainless steel construction makes it appropriate for environments where moisture or chemical exposure would corrode zinc-plated alternatives. The compact hex body width of 6 mm makes it compatible with standard hex drivers and nut drivers commonly found in electronics assembly workflows.

Key Features

• Male-female configuration supports stackable PCB and panel mounting
• 303 stainless steel construction meets QQ-S-763 federal fastener specification
• M4 x 0.7 thread size on both ends for consistent metric compatibility
• Hex body shape allows torque application with standard nut drivers or hex wrenches
• Bright, uncoated finish - no coating variability affecting thread fit or conductivity
• Length tolerance of -0.150 to 0.150 mm for consistent board-to-board spacing

Compatibility

Designed for use in metric M4 x 0.7 threaded PCB mounting applications including circuit board stacking, chassis panel assembly, and electronic enclosure builds where a male-female hex standoff configuration is specified.

Installation Notes

Installation is performed by electronics technicians or panel builders during equipment assembly or service. Power down and de-energize all boards and enclosures before installing or removing standoffs. Use a hex driver or nut driver sized for 6 mm across flats to apply torque - do not over-tighten, as stainless steel threads can gall. Verify M4 x 0.7 thread engagement on both the male post side and the female bore side before securing boards.