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Stripped Phillips heads and mismatched fasteners slow down every project. These DIN7991 hex socket countersunk screws give repair technicians, fabricators, and serious DIYers a reliable, flush-fitting fastener that stays put — even under high torque.
Each screw is precision-machined from 304 stainless steel to DIN7991 specifications, featuring a flat countersunk head with a 90° angle and an internal hex (Allen key) drive. Available in M3, M4, and M5 thread sizes across multiple lengths — M3 from 8 mm to 20 mm (approx. 0.31"–0.79"), M4 from 6 mm to 20 mm (approx. 0.24"–0.79"), and M5 from 8 mm to 20 mm (approx. 0.31"–0.79"). Thread pitches are M3 × 0.5 mm, M4 × 0.7 mm, and M5 × 0.8 mm.
Whether you're assembling aluminum extrusions, mounting electronics panels, building furniture, or working on automotive trim, these M3 M4 M5 hex socket countersunk screws deliver a clean, flush finish and consistent performance across every application.
Flush-mount panels, guards, and covers on aluminum extrusions or steel frames with a fastener that meets DIN7991 dimensional standards.
Secure PCB standoffs, enclosure lids, and rack-mount panels with M3 or M4 hex socket screws that won't strip under repeated assembly cycles.
Install hardware, hinges, and metal inserts with a countersunk screw that disappears into the surface for a professional, furniture-grade finish.
Keep a selection of M3–M5 hex socket screws on hand for general repairs, custom brackets, and mounting tasks around the workshop or garage.
| Standard | DIN7991 |
|---|---|
| Material | 304 Stainless Steel |
| Head Style | Flat Countersunk Head |
| Drive Style | Hex Socket (Allen Key / Internal Hex) |
| Thread Sizes | M3 / M4 / M5 |
| Thread Pitch | M3 × 0.5 mm | M4 × 0.7 mm | M5 × 0.8 mm |
| Head Diameter | M3: 5.7 mm | M4: 7.6 mm | M5: 9.5 mm |
| Available Lengths | M3: 8–20 mm | M4: 6–20 mm | M5: 8–20 mm |
| Hex Key Size | DIN 911 compatible (see variant for exact size) |
| Finish | Natural Stainless (Brushed) |
These screws are manufactured to DIN7991, the German standard for hexagon socket countersunk head screws. This ensures consistent head geometry, thread pitch, and dimensional tolerances across all sizes.
These screws use a standard internal hex (Allen key) drive compatible with DIN 911 hex keys. Typically M3 uses a 2 mm key, M4 uses a 2.5 mm key, and M5 uses a 3 mm key — however, we recommend verifying with your specific hex key set before use.
304 stainless steel offers good corrosion resistance for outdoor and moderately humid environments. For full marine or saltwater immersion applications, 316 stainless steel is generally recommended.
Per DIN7991, these screws have a 90° countersunk head angle, which is the standard for most countersunk holes in metal and wood applications.
Yes. These hex socket countersunk screws are suitable for use in aluminum, mild steel, and rigid plastic substrates. Always ensure the receiving material has the correct threaded hole or insert for the chosen size.
Each listing is sold per piece. Select your required size from the variant options above and adjust the quantity at checkout. Contact us if you need larger bulk orders.
M3, M4, and M5 refer to the nominal outer thread diameter: 3 mm, 4 mm, and 5 mm respectively. Each size also has a specific thread pitch — M3 × 0.5 mm, M4 × 0.7 mm, M5 × 0.8 mm — which must match the threaded hole or nut being used.
