DIN 7976 Tapping Screws, Hexagon Head
DIN 7976 hexagon head tapping screws, ST 2.2 to ST 8: wrench-flat head geometry, type C/F point references and the commercial length ladder to 50 mm.
Last updated: 2026-11
Specifications
DIN 7976 is the hex-head tapping screw — the wrench-driven sheet-metal screw for structural sheet and heavy fixture work where a screwdriver cannot deliver the torque. The withdrawn 08/1990-edition table runs ST 2.2 to ST 8 with thread pitch P, head height k min/max (5.65/5.95 at ST8) and width across flats s min/max (12.73/13 at ST8) printed in paired columns, plus the y columns separating form C (thread-forming) from form F (cutting) point values (7.5 vs 4.2 at ST8). Commercial lengths run 4.5 to 50 mm with the mass table. The bigger sizes (ST 6.3, ST 8) into steel sections are the classic greenhouse, caravan and racking screws: the hex head accepts an impact driver, and the y value tells you the point length that forms or cuts before full thread engagement.
| Standard / scope | DIN 7976 tapping screws, hexagon head — ST 2.2 to ST 8, withdrawn (source label; edition 08/1990) |
|---|---|
| Head geometry | k min/max and s min/max in paired columns per size: k 5.65/5.95 and s 12.73/13 at ST 8 |
| Point form y | type C (thread-forming) and type F (cutting) columns per size — y 7.5 (C) vs 4.2 (F) at ST 8 |
| Commercial lengths l | Ladder 4.5 to 50 mm; approximate mass per 1000 pcs (ρ=7,85 kg/dm³) tabulated |
| Not tabulated | Case hardness, wrench class, finish — per RFQ |
Materials
- Case-hardened steel with zinc or mechanical-galvanized finish for outdoor duty; stainless A2 for corrosive service at lower driving torque. Impact driving wants the C3-class case case hardening the standard assumes — say if the screws will be machine-driven at production rate, since the point form (C vs F) and lubrication change the drive torque significantly
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (DIN 7976 Tapping Screws, Hexagon Head) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
Why a hex head on a sheet-metal screw?
Torque and tooling. A slotted or cross-recess head cambs out around the drive torque that ST 6.3/ST 8 threads need to form or cut into steel; the hex head transfers the same torque from an impact driver or nut runner without stripping, which is why structural sheet connections — purlins to frames, track sections, heavy brackets — standardized on DIN 7976. The paired k and s columns in the grid are the wrench-acceptance data: check the s column (13 at ST 8) against your sockets, because tapping-screw hexes follow the screw-size ladder, not the bolt ladder. For production lines, quote driving torque against point form when you send the RFQ.
Type C or type F — what does the y column decide?
y is the point length that does the thread work before the full thread engages, and it differs by form: at ST 8, 7.5 mm of forming point (type C) against 4.2 mm of cutting point (type F). The longer forming point needs the thinner, ductile stack to roll its thread through; the shorter cutting point suits thicker or harder material where machining the thread beats displacing it. Read your material: soft mild sheet to ~2–3 mm takes C, structural sections and repeated-assembly joints take F. If the assembly sees disassembly, also consider a pilot hole and type F — forming threads gall on re-entry, cutting threads re-engage cleanly.
Related knowledge
- Thread-Forming vs Thread-Cutting vs Thread-Rolling Self-Tapping Screws: What the Evidence Settles on Base Material
- Screw Family Selection by Base Material: Wood, Machine and Self-Tapping Threads, Engagement and Coating
- Hex Bolts vs Socket Head Cap Screws: What the Evidence Settles on Strength, Clearance and Cost
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support