DIN 558 Hex Head Screws (Product Grades C, Long Series)
DIN 558 hexagon head screws, M5–M36 — fully threaded hex screws of product grade C for low-duty through-bolting, with the collected per-size tables: pitch, a, c, d a, d w, e, k, k 1, r and s.
Last updated: 2026-11
Specifications
DIN 558 is the grade-C workhorse hex screw: fully threaded, with the tolerances and head precision deliberately relaxed for joints that are clamped, not calibrated — fences, greenhouses, trailers, ducting, general fabrications. Where DIN 931/ISO 4014 carries a shank and tight tolerances for shear and fatigue duty, DIN 558 threads its whole length and accepts the wider head and thread tolerances of product grade C, which is exactly what low-cost volume hardware wants; the fully threaded body also means one screw serves several grip lengths, simplifying stock. The collected tables run M5 to M36: pitch, the thread run-out tolerance a, chamfer c, transition d a, bearing-face d w, across-corners e, head height k with grade tolerances, the bearing-check k 1, fillet r and across-flats s. The series stops at M36 — beyond that, or where a shear shank or grade-A/B precision matters, move to the ISO 4014/4017 family in this catalog. Property classes (grade C typically pairs with 4.6/5.8) and finishes stay per RFQ.
| Standard | DIN 558 — hexagon head screws, fully threaded, product grade C (through-bolting duty) |
|---|---|
| Series | M5 – M36 (three source column groups: M5/M6/M8/M10, M12/M16/M20, M24/M30/M36) |
| Tabulated geometry | Per size: pitch P, a (max, thread run-out), c (max), d a (max), d w (min), e (min, 8.63–60.79), k (nominal/min/max, 3.5–22.5), k 1 (min), r (min), s (max=nominal, min) |
| Grade / duty | Product grade C — general through-bolting where head and thread tolerances are not load-critical; for fitted or shear-loaded joints use the shanked ISO 4014 / DIN 931 series |
| Property classes / finishes | Not tabulated by the collected specification — per RFQ (grade C commonly pairs 4.6/5.8; confirm at quotation) |
| Attribute | M5 | M6 | M8 | M10 |
|---|---|---|---|---|
| P — Pitch | 0.8 | 1 | 1.25 | 1.5 |
| a — max | 3.2 | 4 | 5 | 6 |
| c — max | 0.5 | 0.5 | 0.6 | 0.6 |
| d a — max | 6 | 7.2 | 10.2 | 12.2 |
| d w — min | 6.7 | 8.7 | 11.4 | 15.4 |
| e — min | 8.63 | 10.89 | 14.2 | 18.72 |
| k — Nominal Size | 3.5 | 4 | 5.3 | 6.4 |
| min | 3.12 | 3.62 | 4.92 | 5.95 |
| max | 3.88 | 4.38 | 5.68 | 6.85 |
| k 1 — min | 2.2 | 2.5 | 3.45 | 4.2 |
| r — min | 0.2 | 0.25 | 0.4 | 0.4 |
| s — max=nominal size | 8 | 10 | 13 | 17 |
| min | 7.64 | 9.64 | 12.57 | 16.57 |
- Row 1 (P — Pitch): The source's first column-group header carries an empty size cell between 'Screw Thread' and 'M5' (a blank header cell as printed); size columns run M5-M10 as labeled.
| Attribute | M12 | M16 | M20 |
|---|---|---|---|
| P — Pitch | 1.75 | 2 | 2.5 |
| a — max | 7 | 8 | 10 |
| c — max | 0.6 | 0.8 | 0.8 |
| d a — max | 14.7 | 18.7 | 24.4 |
| d w — min | 17.2 | 22 | 27.7 |
| e — min | 20.88 | 26.17 | 32.95 |
| k — Nominal Size | 7.5 | 10 | 12.5 |
| min | 7.05 | 9.25 | 11.6 |
| max | 7.95 | 10.75 | 13.4 |
| k 1 — min | 4.95 | 6.5 | 8.1 |
| r — min | 0.6 | 0.6 | 0.8 |
| s — max=nominal size | 19 | 24 | 30 |
| min | 18.48 | 23.16 | 29.16 |
| Attribute | M24 | M30 | M36 |
|---|---|---|---|
| P — Pitch | 3 | 3.5 | 4 |
| a — max | 12 | 14 | 16 |
| c — max | 0.8 | 0.8 | 0.8 |
| d a — max | 28.4 | 35.4 | 42.4 |
| d w — min | 33.2 | 42.7 | 51.1 |
| e — min | 39.55 | 50.85 | 60.79 |
| k — Nominal Size | 15 | 18.7 | 22.5 |
| min | 14.1 | 17.65 | 21.45 |
| max | 15.9 | 19.75 | 23.55 |
| k 1 — min | 9.9 | 12.4 | 15 |
| r — min | 0.8 | 1 | 1 |
| s — max=nominal size | 36 | 46 | 55 |
| min | 35 | 45 | 53.8 |
Materials
- Material, property class and finish specified per RFQ — low-duty outdoor work usually takes zinc plate or hot-dip galvanizing; confirm at quotation
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 558 Hex Head Screws (Product Grades C, Long Series)) 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 1,000–10,000 pieces depending on size. Stock items run 3–7 days. High-strength and custom parts run 15–25 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
DIN 558 or DIN 931/ISO 4014 — when does the cheaper grade-C screw cost more?
When the joint cares about the hole. DIN 558 is fully threaded with grade-C tolerances: in a clearance hole that is fine — the screw just clamps. But put it where the plates are located by the bolt (a shear joint) and the thread now sits in the bearing plane: the saw-tooth thread crest bears instead of a ground shank, the hole works loose under vibration, and the joint that was "saved" by the cheaper screw pays for the rework. The second difference is tolerance discipline — grade-C heads and threads run wider, which is invisible on a fence and very visible in a fixture that expects ISO-grade fit. So the collected tables make sense for what they are: the e/k/s ladder of a utility hex screw from M5 to M36, fully threaded, cheap to make and buy. Use it for through-bolting timber, thin steel, ducting and hardware; step up to the ISO 4014/4017 family (same head dimensions where it matters) the moment the joint is located, fatigued or safety-relevant. Confirm property class and finish at RFQ — the collected specification does not tabulate them.
What is the MOQ and lead time for this bolt type?
The minimum order quantity is 1,000–10,000 pieces depending on size. Stock items ship in 3–7 days; high-strength and custom parts in 15–25 days. Common sizes in this bolt type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
Related knowledge
- What Bolt Property Classes 8.8, 10.9 and 12.9 Encode — and When High Strength Stops Being the Right Choice
- Bolt Grade Selection: ISO 898-1 8.8/10.9/12.9 vs ASTM A307 and A325
- 8.8 vs 10.9 vs 12.9 Bolts: Strength, Hardness and Cost — What the Evidence Settles
- Calculating Bolt Preload and Clamp Force: Torque, Friction and Tightening Method
- How to Determine Tightening Torque and Choose a Tightening Method for a Bolted Joint
- Fastener Failure Modes: Which Fatigue, Creep and SCC Controls the Evidence Supports
- Hydrogen Embrittlement in High-Strength Bolts: Which Grades Need Controls, Which Coatings and Baking Schedules Are Acceptable, and What to Require Before the RFQ
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