Is ISO 7412 the current equivalent of DIN 6914?

No. ISO 7412:1984 is a close historical counterpart, but it was withdrawn in 2019. Keep it in the purchasing cross-reference for legacy identification, while using DIN EN 14399-4 for the current German/European System HV route.

Why is DIN 6914 still used if it is withdrawn?

Legacy drawings, approved BOMs, stock catalogues and buyer vocabulary change more slowly than official standards. DIN 6914 therefore remains a valid search and sourcing term, but a new or changed structural joint should be converted through the controlled DIN EN 14399-4 assembly specification.

What dimensions distinguish a DIN 6914 bolt?

The bolt has a large width across flats and a short threaded portion. Typical examples are M20 with s = 32 mm and k = 13 mm, M24 with s = 41 mm and k = 15 mm, and M30 with s = 50 mm and k = 18.7 mm. Also verify e, bearing face, shank and thread length b.

Can any class 10.9 bolt replace DIN 6914?

No. Property class alone does not match the enlarged head, short thread length, full-diameter shank, compatible nut and washer, preload behaviour or installation procedure. A generic ISO 4014 or fully threaded bolt is not an automatic structural replacement.

Which nut and washer go with DIN 6914?

The legacy DIN system uses the matching DIN 6915 structural nut and the DIN 6916 washer family, with DIN 6917 or DIN 6918 bevelled washers where required. Under DIN EN 14399-4, select compatible declared EN 14399 assembly components rather than mixing legacy and general-purpose hardware.

Is ASME B18.2.6 directly interchangeable with DIN 6914?

No. ASME B18.2.6 uses inch dimensions and Unified threads and primarily supplies dimensional requirements; an ASTM specification such as F3125 completes the mechanical grade. Treat it as a related US structural standard, not a metric equivalent.

Are UNI 5712 and JIS B 1186 exact DIN 6914 equivalents?

No. Keep them as useful regional purchasing cross-references. UNI 5712 is historical and edition-dependent; JIS B 1186 uses its own bolt, nut, washer and strength designations such as F10T. Compare the complete dimensional and assembly requirements.

Should DIN EN ISO 7412 be shown as the current German standard?

No. Do not publish the unverified DIN EN ISO 7412 chain as the current successor. The verified current route for the former DIN 6914 HV product is DIN EN 14399-4; ISO 7412 remains a withdrawn historical ISO reference.

Engineering reference

DIN 6914 vs ISO 7412 & DIN EN 14399-4

Q: What officially replaced DIN 6914?

DIN 6914:1989 is withdrawn. DIN Media identifies DIN EN 14399-4 as the current successor route for preloaded System HV hexagon bolt and nut assemblies. The complete assembly must be specified; this is not merely a number change for an isolated bolt.

High-strength structural hexagon bolts with large width across flats

Cross-reference for DIN 6914 vs ISO 7412 — High-strength structural hexagon bolts with large width across flats. Published equivalents: DIN 6914 / ISO 7412 / ANSI/ASME B18.2.6 / UNI 5712 / JIS B1186 / DIN EN 14399-4. Use this page when converting drawings, checking supplier quotes, or matching catalog products.

Public equivalents

DIN 6914
ISO 7412
ANSI/ASME B18.2.6
UNI 5712
JIS B1186
DIN EN 14399-4

Standard equivalents

DIN	DIN 6914
ISO	ISO 7412
ANSI/ASME	ANSI/ASME B18.2.6
UNI	UNI 5712
JIS	JIS B1186
DIN EN / DIN EN ISO	DIN EN 14399-4

Equivalents are for engineering reference only. * marks a related standard that is not directly interchangeable. Dimensional tolerances, property classes and thread systems can differ — always confirm against the project specification before substitution.

Equivalent guide

Quick answer: what replaced DIN 6914?

DIN 6914:1989 is withdrawn, but the designation remains common on structural drawings, bills of material, supplier catalogues and RFQs. Its verified current German/European successor route is DIN EN 14399-4 for preloaded System HV hexagon bolt and nut assemblies.

ISO 7412:1984 is the close historical ISO counterpart to DIN 6914, not a current replacement: ISO 7412 is also withdrawn. Keep DIN 6914 as the commercial search and legacy purchasing term, but use the exact edition and the complete assembly specification when approving a replacement.

Reference	Status and purchasing relationship
DIN 6914:1989	Withdrawn German legacy bolt standard; still widely specified in industry
ISO 7412:1984	Withdrawn historical counterpart for large-width, short-thread structural bolts
DIN EN 14399-4	Current German/European System HV route for preloaded hexagon bolt and nut assemblies
ASME B18.2.6	Related US inch-series dimensional standard; not a direct metric substitute
UNI 5712	Historical Italian purchasing cross-reference for the same broad structural-bolt family
JIS B 1186	Related Japanese high-strength friction-grip bolting system; not dimensionally identical

See the current DIN EN 14399-4 cross-reference or browse heavy structural hex-head bolts.

Why DIN 6914 and ISO 7412 can be cross-referenced

They describe the same basic historical product concept:

high-strength structural steel bolting;
an external hexagon head with a large width across flats;
ISO metric coarse threads;
a deliberately short threaded portion and a long full-diameter shank;
use with a compatible structural nut and hardened washer;
controlled preload rather than a built-in locking feature.

ISO 7412 covers M12 through M36, product grade C and property classes 8.8 and 10.9. Legacy DIN 6914 HV supply is most commonly associated with property class 10.9. That class difference must remain visible on an RFQ: a shared shape and size do not authorize changing the required mechanical class.

Where the standards differ

Selection point	DIN 6914 / ISO 7412 historical route	DIN EN 14399-4 current route	ASME / JIS regional route
Status	Both withdrawn; retained for legacy procurement	Current System HV assembly standard	Separate regional standards and editions
Product scope	Historical bolt geometry; matching components cited separately	Preloaded bolt-and-nut assembly with system compatibility requirements	ASME dimensions pair with ASTM properties; JIS defines its own friction-grip set
Thread system	ISO metric coarse	ISO metric System HV	ASME uses Unified inch threads; JIS uses its own metric series
Thread length	DIN 6914 and ISO 7412 use the short-thread structural pattern	Use the EN 14399-4 assembly table and ordered grip	Different tables; no conversion by nominal diameter alone
Strength designation	ISO 7412 permits 8.8 and 10.9; DIN 6914 HV orders are commonly 10.9	Specify the complete System HV assembly and required class	ASTM F3125 grades or JIS designations such as F10T are different systems
Nut and washer	Legacy DIN 6915 nut and DIN 6916/6917/6918 washer family	Compatible EN 14399 nut/washer components and suitability for preloading	Matching ASME/ASTM or JIS nut and washer set
Installation	Legacy project tightening rules	Declared preload, tightening procedure and assembly suitability govern	Regional installation and inspection rules govern

The most important difference is therefore not a Phillips-versus-Torx-style detail. It is the change from a legacy bolt callout to a controlled structural bolting assembly.

Identifying DIN 6914 geometry

The enlarged head is a real dimensional feature. Common DIN 6914:1989 identification values include:

Thread	Coarse pitch P	Width across flats s	Head height k
M12	1.75 mm	22 mm	8 mm
M16	2.00 mm	27 mm	10 mm
M20	2.50 mm	32 mm	13 mm
M22	2.50 mm	36 mm	14 mm
M24	3.00 mm	41 mm	15 mm
M27	3.00 mm	46 mm	17 mm
M30	3.50 mm	50 mm	18.7 mm
M36	4.00 mm	60 mm	22.5 mm

These values are useful for identifying a legacy part, not for approving a replacement by themselves. Also compare width across corners, bearing face, shank diameter, under-head transition, tolerance and the actual thread length b for the ordered length.

For example, the 41 mm wrench size on an M24 DIN 6914 bolt is part of its large-width structural geometry. A general-purpose M24 partially threaded bolt with a smaller head is not equivalent merely because its diameter, pitch and property-class marking look familiar.

Short thread length is a functional requirement

The long unthreaded shank is intended to pass through the joint grip while the short threaded end accepts the structural nut. This keeps full-diameter shank material in critical bearing and shear planes where the design requires it.

Do not confuse ISO 7412 with ISO 7411:

Historical ISO standard	Thread-length rule
ISO 7412	Short thread length
ISO 7411	Thread lengths according to ISO 888

A fully threaded bolt, or a bolt whose threads enter a controlled shear plane, is not an automatic replacement even when nominal diameter and length match.

DIN EN 14399-4 is not just a new number

DIN 6914 historically identifies the bolt, with DIN 6915 nuts and structural washers specified through related DIN standards. DIN EN 14399-4 defines System HV preloaded hexagon bolt and nut assemblies within the EN 14399 family.

Consequently, conversion requires checking the complete set:

bolt and nut from a compatible declared assembly;
required structural washer type and orientation;
property class and component markings;
grip, thread length and whether threads enter a shear plane;
coating and its effect on fit and tightening behaviour;
declared tightening characteristic or coefficient class where specified;
project preload, tightening method and inspection procedure;
manufacturer documentation and assembly lot traceability.

Changing only DIN 6914 to DIN EN 14399-4 on a purchase order does not prove assembly compatibility.

ASME B18.2.6, ASTM F3125, UNI 5712 and JIS B 1186

These entries remain useful in a purchasing cross-reference, but they are approximate regional relationships:

ASME B18.2.6 defines US heavy structural fastener dimensions in the inch/Unified-thread system. Mechanical requirements are normally completed by an ASTM specification such as ASTM F3125. It is not a dimension-for-dimension metric replacement.
UNI 5712 is a historical Italian structural-bolt counterpart. Confirm its edition, available diameter, head table, class and matching components before using it for a DIN order.
JIS B 1186 covers Japanese high-strength hexagon bolting sets for friction-grip joints. Designations such as F10T and the matching nut/washer requirements belong to the JIS system; they must not be relabelled as DIN 6914 class 10.9 without comparison.

This is why the standards belong in the same sourcing row while still requiring a differences article.

RFQ and replacement checklist

For a legacy callout such as DIN 6914 M24 × 80 – 10.9, request or confirm:

Original standard edition and whether the project accepts DIN EN 14399-4.
Nominal diameter, coarse pitch, overall length and grip length.
Short thread length b, thread runout and shear-plane position.
Head dimensions s, e, k and bearing-face geometry.
Shank diameter, under-head transition and dimensional tolerances.
Required property class or complete EN/ASTM/JIS strength designation.
Matching nut, washer type, hardness, dimensions and component markings.
Coating, lubrication, corrosion category and hydrogen-embrittlement controls.
Required preload, tightening method, coefficient class and inspection method.
Assembly manufacturer, lot traceability and inspection documents.

Purchasing conclusion

DIN 6914 remains a valuable industry keyword and legacy purchasing designation, but it is no longer the official current German standard. Use ISO 7412 only as a withdrawn historical counterpart. For a new German or European preloaded structural joint, follow DIN EN 14399-4 and approve the complete System HV bolt–nut–washer assembly rather than substituting a bolt number in isolation.