Value Collection 3tnc905c Acorn Nut 5/16-18 Unc Grade 316

Product Description

The VALUE COLLECTION 3tnc905c is a standard acorn nut machined from Grade 316 stainless steel. Acorn nuts, also called cap nuts or dome nuts, enclose an exposed thread end to protect the thread and provide a finished appearance. This nut features a 5/16-18 UNC right-hand thread, a 9/16-inch width across flats, and an overall height of 17/32 inch. The uncoated finish is characteristic of 316 stainless, which offers strong resistance to corrosion and oxidation. Plumbers, pipefitters, HVAC technicians, and maintenance trades reach for Grade 316 fasteners when working in wet, marine, or chemically aggressive environments.

This acorn nut is suited for applications where a clean thread termination is needed alongside corrosion resistance. Typical uses include pipe flange assemblies, panel enclosures, mechanical equipment mounting, and any installation where the fastener may be exposed to moisture, salt air, chlorinated water, or mild chemical exposure. The 5/16-18 UNC thread size is a common coarse-thread specification found across a wide range of trade equipment and structural hardware.

Key Features

• Grade 316 stainless steel construction for superior corrosion resistance in harsh or wet environments
• 5/16-18 UNC right-hand thread for broad compatibility with standard coarse-thread fastener systems
• 9/16-inch width across flats fits standard hex wrenches and sockets
• 17/32-inch overall height provides full thread enclosure and a low-profile dome finish
• Uncoated silver finish — no plating to chip, flake, or react with stainless base material
• Standard acorn nut geometry protects exposed male threads from damage and contamination

Compatibility

Designed as a standard 5/16-18 UNC acorn nut for use with any 5/16-18 UNC male-threaded fastener or stud requiring a domed cap termination.

Installation Notes

Installation is performed by hand-threading onto a compatible 5/16-18 UNC stud or bolt, then tightening with a 9/16-inch hex wrench or socket. Verify that the mating thread is also Grade 304 or 316 stainless, or a compatible material, to avoid galvanic corrosion in wet environments. De-energize and depressurize any system before replacing fasteners on live equipment. Do not overtighten — stainless fasteners are susceptible to galling; apply an appropriate anti-seize compound when working with stainless-to-stainless thread engagement.