M3-0.5 x 40 18-8 Stainless Steel Metric Flat Head Socket Cap Screw combines a 90° flat head, metric thread, and internal hex drive for low-projection stainless fastening. The flush surface helps reduce snag points around covers, guards, slide paths, and handled equipment faces.

Metric fixture plates and inspection tooling use flat heads when a workpiece must rest on or pass across the fastened surface. Flat head screws measure length overall, including the head, so this size is selected by the total screw length shown on the print. Confirm overall length, head diameter, head height, socket size, and key engagement before substitution.

Cold Headers has supported specialty socket fastener sourcing since 1962, including exact metric sizes for maintenance and production work. Compare 18-8 Metric Socket Head Cap Screws when a full cylindrical head is preferred.

Technical Highlights

• Head Style: Flat (countersunk), internal hex drive
• Countersink Angle: 90°
• Material: 18-8 Stainless Steel
• Thread Size: M3-0.5 (coarse metric pitch)
• Length: 40 mm (overall, including head)
• Head Diameter: 6.00 / 5.82 mm (max/min)
• Head Height: 1.86 mm (max)
• Hex Key Size: 2.0 mm
• Minimum Key Engagement: 1.05 mm
• Dimensional Standard: ISO 10642

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