Electro Hardware P509M07F16-440 Round Female Standoff

Product Description

The ELECTRO HARDWARE P509M07F16-440 is a round female standoff designed for use in precision fastening and spacer applications in electronic, electrical, and mechanical assemblies. This standoff features a 4-40 thread size with a 0.1875-inch overall length and a 0.25-inch outside diameter. The body is fully threaded and manufactured from 18-8 grade 303 stainless steel with a bright finish, meeting the QQ-S-763 federal standard for stainless steel hardware. It is a compact, low-profile spacer suited for use in control panels, PCB mounting, enclosures, and other assemblies where secure, corrosion-resistant spacing between components is required.

This standoff is commonly used in residential and commercial electrical and electronic equipment assemblies, including control board mounting, instrument panel fabrication, and enclosure builds. The 4-40 thread size is a standard designation in light-duty electronics and precision mechanical assembly work. Electricians, electronics technicians, and mechanical assemblers typically install these standoffs in situations requiring repeatable spacing and reliable thread engagement in stainless steel hardware.

Key Features

• 4-40 female thread size for standard light-duty electronics applications
• Fully threaded body for maximum thread engagement along the 0.5-inch thread depth
• 18-8 grade 303 stainless steel construction for corrosion resistance
• Bright finish meeting QQ-S-763 federal specification
• Compact 3/16-inch overall length with 1/4-inch outside diameter for tight-clearance installations
• Length tolerance of -0.005 to 0.005 inches for consistent fitment in precision assemblies

Compatibility

Designed as a standard 4-40 female round standoff for use in electronic and mechanical assemblies requiring inch-system fasteners and stainless steel hardware meeting QQ-S-763 specifications.

Installation Notes

Installation is typically performed by electronics technicians or mechanical assemblers using a hex key or appropriate driver for the 4-40 thread size. Ensure mating screws and threads are clean and free of debris before installation to avoid galling, which is a common risk with stainless steel fasteners. Do not overtighten, as the 4-40 thread is a fine, light-duty designation and susceptible to thread damage under excessive torque.