ISO 4018 Hexagon Head Screws, Production Class C
ISO 4018 hexagon head screws, production class C M5 to M64 — fully threaded rough hex screws, with the collected D/P/K/C/R/A rows, the split DIN 558 vs ISO 4018 e/S rows and the L length envelope.
Last updated: 2026-11
Specifications
ISO 4018 is the fully threaded member of the class C pair (ISO 4016 is the bolt with shank): a rough hex head over thread to the shoulder, the screw you run through unpositioned holes and clamp with a nut where the shear path is through the thread. The collected attribute ladder runs M5 – M64 with the source's capitalised row labels kept verbatim: D (thread), P (pitch 0,8 → 6), K (head height 3,5 → 40), C max. (washer-face 0,5 → 1), R (fillet 0,2 → 2), A max. (an unlegended auxiliary row, 2,4 → 16,5 across the ladder — and then it prints 28 at M64, flagged verbatim as a suspected lost decimal comma). The e and S rows each carry TWO stacked values per the source: DIN 558 versus ISO 4018 (e.g. across corners e at M10 is 18,72 per DIN 558 and 17,59 per ISO 4018; width across flats S 17 vs 16) — the designation difference is reproduced as the source prints it, because the two standards share a body with different hex tolerances and your drawing decides which governs. Length envelope L min./max. runs 10 → 120 and 60 → 500 per size. Property class (commonly 4.6/5.6), material and finish are not tabulated — per RFQ.
| Standard | ISO 4018 — hexagon head screws, production class C (fully threaded rough hex screw) |
|---|---|
| Size range | M5 – M64 in the collected ladder; length envelope L 10 – 120 (min.) / 60 – 500 (max.) per size |
| Head geometry | K 3,5 → 40; C max. 0,5 → 1; R 0,2 → 2; A max. 2,4 → 16,5 with M64 printing 28 verbatim (flagged) |
| Designation split | e and S rows carry DIN 558 vs ISO 4018 values separately (M10: e 18,72 vs 17,59; S 17 vs 16) — as the source prints |
| Thread | P: 0,8 (M5) → 6 (M64) coarse pitch |
| Material / class / finish | Class C = tolerance regime; property class (commonly 4.6/5.6), material and finish not tabulated — per RFQ |
| D | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M36 | M42 | M48 | M56 | M64 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P | 0,8 | 1 | 1,25 | 1,5 | 1,75 | 2 | 2 | 2,5 | 2,5 | 2,5 | 3 | 3 | 3,5 | 4 | 4,5 | 5 | 5,5 | 6 | |
| K | 3,5 | 4 | 5,3 | 6,4 | 7,5 | 8,8 | 10 | 11,5 | 12,5 | 14 | 15 | 17 | 18,7 | 22,5 | 26 | 30 | 35 | 40 | |
| C max. | 0,5 | 0,5 | 0,6 | 0,6 | 0,6 | 0,6 | 0,8 | 0,8 | 0,8 | 0,8 | 0,8 | 0,8 | 0,8 | 0,8 | 1 | 1 | 1 | 1 | |
| R | 0,2 | 0,25 | 0,4 | 0,4 | 0,6 | 0,6 | 0,6 | 0,6 | 0,8 | 0,8 | 0,8 | 1 | 1 | 1 | 1,2 | 1,6 | 2 | 2 | |
| A max. | 2,4 | 3 | 4 | 4,5 | 5,3 | 6 | 6 | 7,5 | 7,5 | 7,5 | 9 | 9 | 10,5 | 12 | 13,5 | 15 | 16,5 | 28 | |
| e | DIN 558 | 8,63 | 10,89 | 14,2 | 18,72 | 20,88 | 23,91 | 26,17 | 29,56 | 32,95 | 38,42 | 39,55 | 45,2 | 50,85 | 60,79 | 71,3 | 82,6 | 93,56 | 104,86 |
| ISO 4018 | 17,59 | 19,85 | 22,78 | 37,29 | |||||||||||||||
| S | DIN 558 | 8 | 10 | 13 | 17 | 19 | 22 | 24 | 27 | 30 | 32 | 36 | 41 | 46 | 55 | 65 | 75 | 85 | 95 |
| ISO 4018 | 16 | 18 | 21 | 34 | |||||||||||||||
| L | min. | 10 | 12 | 10 | 16 | 16 | 20 | 25 | 35 | 30 | 45 | 50 | 55 | 60 | 70 | 80 | 100 | 110 | 120 |
| max. | 60 | 80 | 100 | 100 | 120 | 100 | 160 | 180 | 200 | 220 | 240 | 280 | 300 | 360 | 420 | 480 | 500 | 500 |
- Row 5 (A max.): A max. prints 28 at M64 against the ladder's 2,4 -> 16,5 progression (a lost decimal comma suspected) - carried verbatim, confirm M64 per RFQ
- Row 6 (e): the e row is split: DIN 558 values (e.g. M10 18,72) with ISO 4018's own values (17,59 at M10) on the following row - the designation difference is reproduced verbatim
- Row 8 (S): the S row likewise splits DIN 558 (17 at M10) vs ISO 4018 (16 at M10) - verbatim
Materials
- Property class and finish specified per RFQ — fully threaded class C screws commonly run 4.6/5.6 steel; state whether your drawing dimensions the hex per DIN 558 or ISO 4018 (the collected e/S rows differ per designation) and the corrosion environment 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 (ISO 4018 Hexagon Head Screws, Production Class C) 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
The e and S values differ between DIN 558 and ISO 4018 on this page — which row governs my order?
Your drawing's designation. DIN 558 and ISO 4018 describe the same rough fully-threaded hex body, but they tolerance the hex differently — the capture reproduces the split faithfully: at M10, across corners e is 18,72 per DIN 558 and 17,59 per ISO 4018, and width across flats S is 17 vs 16. Practically it means a wrench that fits one comfortably may rock on the other, and a socket-size purchase should follow the designation on your drawing or the mating tooling you already own. The ISO 4018 row is the current ISO figure; the DIN 558 row matters for legacy site stock. One more capture quirk flagged rather than corrected: the auxiliary A max. row prints 28 at M64 against a 2,4 → 16,5 progression — a lost decimal comma is suspected, so confirm M64 per RFQ before ordering the largest size. For a shear-loaded joint remember this screw threads to the head: if the shear plane should pass an unthreaded shank, that is ISO 4016 (also in this catalog). Class, material and finish per RFQ.
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