For drawings calling out 4-40 x 5/16, this 18-8 stainless hex head fastener supports assemblies where top-drive clearance is not required. In this size range it is treated as a hex head machine screw, with the hex head driven by external tooling rather than an internal socket.
Common application reviews include food processing skids, washdown equipment, and packaging lines. The head can be tightened with standard side-access tooling, which helps where top clearance is limited by covers or nearby components.
18-8 stainless steel is an 18% chromium and 8% nickel austenitic stainless material used for ordinary atmosphere, moisture exposure, washdown, and clean appearance. Cold Headers helps buyers match uncommon lengths, older drawings, and replacement sizes without changing the protected SKU data.
Technical Highlights
- Material: 18-8 Stainless Steel
- Thread Size: 4-40
- Length: 5/16 in.
- Head Style: Hex
- Drive: External Hex (wrench or socket driven)
- Width Across Flats: 0.489-0.500 in.
- Wrench Size: 1/2 in.
- Head Height: 0.195-0.211 in.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
