This product is an M3 x 50mm slotted countersunk machine screw manufactured to DIN 84 in A4 (316) stainless steel, designed to fasten components into tapped holes or to secure assemblies with a flush countersunk finish. Its primary use is where a flush surface is required and corrosion resistance in aggressive environments is important, for example fixing plates, panels and enclosures where a neat, recessed head is preferred.

The screw is made from austenitic 316 stainless steel (A4), offering superior resistance to chlorides and many chemicals compared with standard 304/A2 stainless. The thread is metric ISO coarse (M3 x 0.5) compatible with ISO 261/262 thread forms and with standard M3 nuts and tapped holes. The head form is countersunk (CHS) to sit flush in a 90° countersink and the drive is a single slot (slotted) suitable for hand and low‑torque screwdriver use. Manufacturing dimensions and form comply with DIN 84 for slotted countersunk machine screws.

Typical applications for M3 x 50 DIN 84 A4 screws include marine and boatbuilding fittings, food and beverage equipment, chemical processing plant, instrumentation enclosures, outdoor signage and architectural fixings where exposure to saltwater or aggressive atmospheres demands enhanced corrosion resistance. The slotted countersunk head is favoured in electronics and small mechanical assemblies where an unobtrusive, low‑profile fastening is required.

Key benefits of this specification are the improved pitting and crevice corrosion resistance of 316 stainless steel compared with 304, and dimensional interchangeability assured by the DIN 84 standard. The M3 thread size provides compatibility with common metric hardware and tapped holes; the slotted drive gives simple manual assembly, though it is less suited to high torque or rapid automated installation than cross‑head or hex drives.

Duchy Fasteners stocks DIN 84 slotted countersunk machine screws in A4 (316) stainless steel across common metric diameters and lengths. This M3 x 50mm item is available to purchase individually or in trade packs—please contact us for current size and pack options. Product code: A4MCCH030050.