DIN 6914 Hex Bolts with Large Head (System HV)
DIN 6914 hexagon bolts with large head, System HV structural bolting, M12–M36 — the collected per-size tables: pitch, shank d s, e, k, r, s and the split "Length of Thread b" rows above/below the source's step line.
Last updated: 2026-11
Specifications
DIN 6914 is the German heavy-hex structural bolt of the HV system — the predecessor that EN 14399-4 formally replaced and the designation still used across a large installed base of drawings and stock lists. Geometry matches its successor at the shared sizes: the large hex head (across-flats 22 at M12, 60 at M36 in the collected tables), the controlled shank and the head height dimensioned for high-preload steel work. The collected tables carry the same per-size ladder as the EN page plus a distinctly DIN-style thread-length presentation: "Length of Thread b" split into values "for lengths above the step line" and "for lengths below the step line" — the DIN convention of a grip-length boundary above which the thread must be longer; the collected page prints the two b values without locating the step line per size (flagged in the table notes), so quote the bolt length and required thread length explicitly. Property classes and finishes stay per RFQ.
| Standard | DIN 6914 — hexagon bolts with large head, System HV structural bolting (superseded by EN 14399-4, which the collected EN page states it replaces) |
|---|---|
| Series | M12 – M36 (two source column groups: M12/M16/M20/M22 and M24/M27/M30/M36) |
| Tabulated geometry | Per size: pitch P, d s (max/min), e (min), k (nominal/max/min), r (min), s (max=nominal, min), Length of Thread b split "for lengths above the step line" / "for lengths below the step line" (b 21–48 / 23–50 as printed) |
| Thread length | The collected page prints the two b values but not the step-line position per size (see table footnote) — state bolt length and thread length explicitly at RFQ |
| Property classes / finishes | Not tabulated by the collected specification — per RFQ (HV assemblies: state class, coating and documentation) |
| Attribute | M12 | M16 | M20 | M22 |
|---|---|---|---|---|
| P — Pitch | 1.75 | 2 | 2.5 | 2.5 |
| d s — Nominal Size | 12 | 16 | 20 | 22 |
| max | 12.7 | 16.7 | 20.84 | 22.84 |
| min | 11.3 | 15.3 | 19.16 | 21.16 |
| e — min | 23.91 | 29.56 | 35.03 | 39.55 |
| k — Nominal Size | 8 | 10 | 13 | 14 |
| max | 8.45 | 10.75 | 13.9 | 14.9 |
| min | 7.55 | 9.25 | 12.1 | 13.1 |
| r — min | 1.2 | 1.2 | 1.5 | 1.5 |
| s — max=nominal size | 22 | 27 | 32 | 36 |
| min | 21.16 | 26.16 | 31 | 35 |
| Length of Thread b — for lengths above the step line | 21 | 26 | 31 | 32 |
| for lengths below the step line | 23 | 28 | 33 | 34 |
- Row 12 (Length of Thread b — for lengths above the step line): The collected page splits thread length b into above/below 'the step line' but does not print where the step line sits for each size; the EN 14399-4 page (its successor per the source) prints a single reference b instead.
| Attribute | M24 | M27 | M30 | M36 |
|---|---|---|---|---|
| P — Pitch | 3 | 3 | 3.5 | 4 |
| d s — Nominal Size | 24 | 27 | 30 | 36 |
| max | 24.84 | 27.84 | 30.84 | 37 |
| min | 23.16 | 26.16 | 29.16 | 35 |
| e — min | 45.2 | 50.85 | 55.37 | 66.44 |
| k — Nominal Size | 15 | 17 | 19 | 23 |
| max | 15.9 | 17.9 | 20.05 | 24.05 |
| min | 14.1 | 16.1 | 17.95 | 21.95 |
| r — min | 1.5 | 2 | 2 | 2 |
| s — max=nominal size | 41 | 46 | 50 | 60 |
| min | 40 | 45 | 49 | 58.8 |
| Length of Thread b — for lengths above the step line | 34 | 37 | 40 | 48 |
| for lengths below the step line | 37 | 39 | 42 | 50 |
Materials
- Material, property class and finish specified per RFQ — drawings naming DIN 6914 usually accept its EN 14399-4 successor; confirm equivalence 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 6914 Hex Bolts with Large Head (System HV)) 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
Our drawing calls DIN 6914 — can we source EN 14399-4 instead?
In practice, yes on geometry: the collected tables show DIN 6914 and EN 14399-4 at the same sizes share head height, across-flats, across-corners and shank dimensions (the EN page states it replaces DIN 6914). What changed with the EN standard is the surrounding system — mark verification, fit classes (HV k-class), test documentation and the EN 14399 nut/washer pairing — so the substitution is a drawing-office decision, not a purchasing one. Two practical notes from the collected pages: DIN 6914's thread-length table splits b "above/below the step line" while EN 14399-4 prints a single reference b, so check the grip length against the EN value; and if the joint is a fatigue- or slip-critical connection, the assembly class and lubrication are part of the specification — name them at RFQ and the documentation follows the order.
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