4-40 x 1 1/2 316 Stainless Steel Button Head Socket Cap Screw is commonly specified where a smooth, low rounded head is needed on hardware exposed to washdown, moisture, or corrosive service. The button-head design gives engineers a compact rounded profile, a broad bearing surface, and internal hex drive access, while the 316 stainless steel material is selected where additional corrosion resistance is needed compared with general-purpose stainless grades.

Typical applications include processing equipment and control panels, where the broad head can spread contact on covers or brackets while keeping socket access available. It can also serve processing equipment and control panels, where the broad head can spread contact on covers or brackets while keeping socket access available. Because the drive is internal, installers can tighten the fastener without side clearance for an external wrench.

For the 4-40 thread and 1 1/2 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in. These values help buyers and maintenance teams confirm the correct thread, length, drive size, and head geometry.

Technical Highlights

• Material: 316 Stainless Steel
• Thread Size: 4-40
• Length: 1 1/2 in.
• Nominal Body Diameter: #4 (.112 in.)
• Head Diameter: 0.201-0.213 in.
• Head Height: 0.051-0.059 in.
• Hex-Key Size: 1/16 in.
• Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

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