M4-0.7 x 40 18-8 Stainless Steel Metric Socket Head Cap Screw identifies the exact metric size for a stainless socket head cap screw used in machinery and equipment panels. The cylindrical socket head gives wrench access through the internal hex while keeping the head shape familiar for counterbored metric designs. 18-8 is a general-purpose stainless choice, so final material selection still depends on chemicals, chlorides, load, and service conditions.

Replacement repairs on humid plant equipment can use 18-8 stainless to reduce repeated rust-stain service issues. For stainless-on-stainless threads, moderate installation speed and a suitable lubricant or anti-seize help reduce galling risk.

Review the metric thread, length, head diameter, head height, socket size, and key engagement before substituting another screw.

Technical Highlights

• Head Style: Cylindrical socket head, internal hex drive
• Material: 18-8 Stainless Steel
• Thread Size: M4-0.7 (coarse metric pitch)
• Length: 40 mm
• Head Diameter: 7.00 / 6.64 mm (max/min)
• Head Height: 4.00 / 3.82 mm (max/min)
• Hex Key Size: 3.0 mm
• Minimum Key Engagement: 2.0 mm
• Dimensional Standard: ISO 4762 / DIN 912

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