4-40 x 3/4 1960 Series 18-8 Stainless Steel Socket Head Cap Screw with Nylon Insert combines the familiar socket head profile with a nylon insert for added loosening resistance. The insert is positioned in the threaded body so the screw can develop prevailing torque during engagement.

Typical applications include pharmaceutical fixtures, inspection stations, and clean industrial work cells, where the exact thread and length help match drawings, service records, and replacement needs. 18-8 stainless is a practical choice for ordinary moisture exposure, washdown-adjacent machinery, and equipment where a clean stainless finish is specified.

For rounded exposed heads with the same locking concept, review 18-8 Button Head Socket Cap Screws with Nylon Insert. Need the pellet in a non-catalog size or position? In-house pelletizing gives Cold Headers a practical route for special requests.

Technical Highlights

• Series: 1960 Series
• Material: 18-8 Stainless Steel
• Thread Size: 4-40
• Length: 3/4 in.
• Drive Type: Internal Hex
• Locking Feature: Nylon insert providing prevailing torque
• Nylon Insert Diameter (P): 1/16 in.
• Nylon Insert Location (N): 7/64 in. +/-1/2 pitch
• Head Dimensions: ASME B18.3, 1960 Series

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.