M5-0.8 x 40 18-8 Stainless Steel Metric Flat Head Socket Cap Screw is a 90° countersunk 18-8 stainless steel metric flat head socket cap screw for flush seating in a matching metric countersink. The head is intended to seat flush when the mating countersink is correctly prepared for the metric flat-head angle.

Guide rails and slide tracks use metric flat heads where any projection can interrupt motion or rub against a moving part. Some metric drawings call this 18-8 family A2 stainless; that is material wording, not a mechanical rating. Confirm overall length, head diameter, head height, socket size, and key engagement before substitution.

Cold Headers supports distributors and MRO buyers who need stainless metric socket products identified by exact size. Cut-to-length service can be reviewed for non-standard metric lengths. 18-8 inch-series Flat Head Socket Cap Screws belong with inch drawings.

Technical Highlights

• Head Style: Flat (countersunk), internal hex drive
• Countersink Angle: 90°
• Material: 18-8 Stainless Steel
• Thread Size: M5-0.8 (coarse metric pitch)
• Length: 40 mm (overall, including head)
• Head Diameter: 10.00 / 9.78 mm (max/min)
• Head Height: 3.10 mm (max)
• Hex Key Size: 3.0 mm
• Minimum Key Engagement: 1.86 mm
• Dimensional Standard: ISO 10642

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