Fastener standard equivalences: DIN to ISO / EN crossover

Which ISO or EN standard replaced or corresponds to a given DIN fastener standard, whether the two are dimensionally interchangeable or differ, and what changed. Covers hex bolts, socket screws, set screws, nuts, washers, pins, rivets, machine screws, studs, and other mechanical fastener types. Answers 'is DIN 933 the same as ISO 4017', 'what replaced DIN 912', and 'can I substitute one for the other' — questions where the practical answer depends on specific dimensional changes (width across flats, head height, thread range) that the sources document.

Records164

Sources5

Verified2026-08-12

Review by2028-08-11

LicenceFactual compilation with source citations. The DIN-to-ISO equivalence is a fact about which standard number maps to which; short attributed quotes link back to the published chart or page. No standard text is reproduced.

79 records where two or more sources state different values. Both sides are reproduced on the record page, each with its own source and quote.

The data

DIN standard	Fastener description	ISO equivalent	Interchangeability	Modification notes	EN ISO number
125sources differ	Normal vs chamfered faces.	7089, 7090	Fully interchangeable
125-1sources differ	Product grade A washers with a hardness up to 250 HV, designed for use with hexagon head bolts and nuts	7089	Without chamfer, up to nominal diameter 64	Without chamfer, up to nominal diameter 64
125-2sources differ	Product grade A washers with a hardness from 300 HV, designed for use with hexagon head bolts and nuts	7089	Without chamfer, up to nominal diameter 64	Without chamfer, up to nominal diameter 64
126sources differ	Product grade C washers, designed for use with hexagon head bolts and nuts	7091	Nominal sizes changed	Nominal sizes changed
127	Spring Lock Washers with square ends or tang ends
128	Curved and wave Spring Lock Washers
137	Spring Washers, curved or wave
1433	Clevis pins without head	2340	Some other nominal lengths defined	Some other nominal lengths defined	22340
1434	Clevis pins with head	2341	Only one head dimension. Some other nominal lengths defined	Only one head dimension. Some other nominal lengths defined	22341
1435	Clevis pins with head	2341	Only one head dimension. Some other nominal lengths defined	Only one head dimension. Some other nominal lengths defined	22341
1436	Clevis pins with head	2341	Only one head dimension. Some other nominal lengths defined	Only one head dimension. Some other nominal lengths defined	22341
1440sources differ	Plain washers for clevis pins; product grade A	8738	Nominal sizes changed	Nominal sizes changed	28738
1443sources differ	Clevis pins without head	2340			22340
1444sources differ	Clevis pins with head	2341	Some other nominal lengths defined	Some other nominal lengths defined	22341
1470sources differ	Grooved pins – Fulllength parallel grooved, with pilot	8739	Nominal lengths redefined. Shear rate increased.	Nominal lengths redefined. Shear rate increased.
1471sources differ	Grooved pins – Fulllength taper grooved	8744	Nominal lengths redefined. Shear rate increased.	Nominal lengths redefined. Shear rate increased.
1472sources differ	Grooved pins – Half-length taper grooved	8745	Nominal lengths redefined. Shear rate increased.	Nominal lengths redefined. Shear rate increased.
1473sources differ	Grooved pins – Full-length parallel grooved, with chamfer	8740	Nominal lengths redefined. Shear rate increased.	Nominal lengths redefined. Shear rate increased.
1474sources differ	Grooved pins – Half-length reverse-taper grooved	8741	Nominal lengths redefined. Shear rate increased.	Nominal lengths redefined. Shear rate increased.
1475sources differ	Grooved pins – One-third-length centre grooved	8742	Nominal lengths redefined. Shear rate increased.	Nominal lengths redefined. Shear rate increased.
1476sources differ	Grooved pins with round head	8746	Chamfer redefined	Chamfer redefined
1477sources differ	Grooved pins with countersunk head	8747	Chamfer redefined	Chamfer redefined
1481sources differ	Spring-type straight pins – Slotted, heavy duty	8752	Specification “non-jamming” included; chamfer redefined; partial change of dimensions	Specification “non-jamming” included; chamfer redefined; partial change of dimensions
1587	Hexagon Domed Cap Nuts
1816	Round Nut with set pin holes inside; ISO metric fine thread
315	Wing Nuts with rounded wings
316	Wing Screws with rounded wings
404	Slotted Capstan Screws
417sources differ	Slotted set screws with long dog point	7435	No modifications of dimensions	No modifications of dimensions	27435
427sources differ	Slotted headless screws with shank	2342
428	Hexagon Nuts, Grade C	4034
433sources differ	Small series.	7092	Fully interchangeable
433-1sources differ	Product grade A washers with a hardness up to 250 HV, designed for use with cheese head screws	7092	Pyramid diamond hardness 140 HV cancelled; rating changed	Pyramid diamond hardness 140 HV cancelled; rating changed
433-2sources differ	Product grade A washers with a hardness up to 300 HV, designed for use with cheese head screws	7092	Nominal sizes changed	Nominal sizes changed
438sources differ	Legacy to EN conversion.	27436	Check spec
439sources differ	Chamfered/unchamfered covered by ISO pair.	4035, 4036	Fully interchangeable
439-1sources differ	Hexagon thin nuts with M 1,6 to M 10 threads	4036	Correlation of dimensions with DIN 439-1, except for the width across flat of the nut M10	Correlation of dimensions with DIN 439-1, except for the width across flat of the nut M10
439-2sources differ	Hexagon thin nuts with M 1,6 to M 52 and M 8×1 to M 52×3 threads	4035	In tables 1 and 2 abbreviations changed and some specifications (thread dimensions) changed	In tables 1 and 2 abbreviations changed and some specifications (thread dimensions) changed
440sources differ	Plain washers – Extra large series, product grade C	7094	Nominal sizes changed, nominal size 24 size “a” redefined to the maximum, square-end hole Form R omitted; (standard DIN 440 still valid)	Nominal sizes changed, nominal size 24 size “a” redefined to the maximum, square-end hole Form R omitted; (standard DIN 440 still valid)
444	Eyebolts
462	Machine tools; internal tab washers for slotted round nuts for hook spanner according to DIN 1804
464	Knurled Thumb Screws, high type
466	Knurled Nuts, high type
467	Knurled Nuts, low type
471	Circlips (retaining rings) for shafts; normal type and heavy type
479	Square Head Bolts with short dog point
5406	Lock Washers and locking plates for use with rolling bearings
548	Round Nuts with set pin holes inside
551sources differ	Slotted set screws with flat point	4766	No modifications of dimensions	No modifications of dimensions	24766
553sources differ	Slotted set screws with cone point	7434	No modifications of dimensions	No modifications of dimensions	27434
555sources differ	Hexagon nuts; Metric Thread, Type g	4034	Width across flats according to DIN ISO 272 included; nominal diameter reduced	Width across flats according to DIN ISO 272 included; nominal diameter reduced
558sources differ	Hexagon screws, Thread Approximately to Head, Metric Thread, Type g	4018	Nominal size extended; width across flats according to DIN ISO 272 included	Nominal size extended; width across flats according to DIN ISO 272 included
580	Collar Eyebolts for lifting purposes
601sources differ	Hexagon Bolts without Hexagon Nut – with Hexagon Nut, Type g	4016	Nominal size extended; width across flats according to DIN ISO 272 included	Nominal size extended; width across flats according to DIN ISO 272 included
603sources differ	Mushroom head square neck bolts	8677
609	Hexagon Fits Bolts with long thread
6319	Spherical Washers and conical seats
6325sources differ	Parallel pins, Hardened; Tolerance Zone m6	8734	Some other nominal lengths defined	Some other nominal lengths defined
6340	Washers for clamping devices
653	Knurled Thumb Screws, low type
6797	Toothed Lock Washers
6798	Serrated Lock Washers
6799	Lock Washers (retaining washers) for shafts
6900	Screw and Washer assemblies	10644
6901	Tapping Screw and Washer assemblies	10510
6902	Plain Washers for screw and washer assemblies	10673
6903	Plain Washers for tapping screw and washer assemblies	10669
6912	Hexagon Socket Thin Head Cap Screws with pilot recess
6914sources differ	High-strength hexagon head bolts with large widths across flats for structural steel bolting	7412			14399-4
6915	High-strength hexagon nuts with large widths across flats for structural steel bolting				14399-4
6916sources differ	Washers for high tensile bolting in steel structures	7416			14399-6
6921sources differ	Hexagon flange bolts	8102	Dimensions partially changed; width across flats according to ISO 272; strength 12.9 omitted	Dimensions partially changed; width across flats according to ISO 272; strength 12.9 omitted	1665
6922	Hexagon Flange Bolts with reduced shank	1665
6923sources differ	Hexagon nuts with flange	4161	Fine thread omitted to be included in a separate standard later); width across flat M10 changed	Fine thread omitted to be included in a separate standard later); width across flat M10 changed	1661
6924sources differ	Prevailing torque type hexagon nuts with non-metallic insert	7040	Height of nut changed; width across flat according to ISO 272 included	Height of nut changed; width across flat according to ISO 272 included
6925sources differ	Prevailing torque type all-metal hexagon nuts	7042	Height of nut changed; width across flat according to ISO 272 included	Height of nut changed; width across flat according to ISO 272 included
6926sources differ	Prevailing torque type hexagon nuts with flange (with non-metallic insert), with metric fine pitch thread	12125	Width across flat M10 changed	Width across flat M10 changed	1666
6927sources differ	Prevailing torque type – All-metal hexagon nuts with flange	7044	Width across flat M10 changed	Width across flat M10 changed	1664
7045	Pan Head Screws with type H or type Z cross recess - product grade A
7337sources differ	Break mandrel Blind Rivets	14589
7343sources differ	Spring-type straight pins – Coiled, standard duty	8750	Range of nominal diameters and lengths extended. Shear range changed.	Range of nominal diameters and lengths extended. Shear range changed.
7344sources differ	Spring-type straight pins – Coiled, heavy duty	8748	Range of nominal diameters and lengths extended. Shear range changed.	Range of nominal diameters and lengths extended. Shear range changed.
7346sources differ	Spring-type straight pins, slotted, light duty	3337	Specification “non-jamming” included; chamfer redefined; partial change of dimensions	Specification “non-jamming” included; chamfer redefined; partial change of dimensions	13337
7349	Plain Washers for Bolts with heavy clamping sleeves
7500-1sources differ	Thread rolling screws for ISO metric thread – Part 1: Technical specifications for case hardened and tempered screws	7085	Normative revision, values for case-hardening depth and hole size revised, torque values reduced	Normative revision, values for case-hardening depth and hole size revised, torque values reduced
7500-2	Thread rolling Screws for ISO metric thread; guideline values for hole diameters
7504sources differ	Cross recessed countersunk head drilling screws with tapping screw thread	15482	Standard divided into five single standards (EN ISO 10666, 15480, 15481, 15482, 15483); thread ST 3.9 omitted; hexagon head with collar and slot (Form L) omitted	Standard divided into five single standards (EN ISO 10666, 15480, 15481, 15482, 15483); thread ST 3.9 omitted; hexagon head with collar and slot (Form L) omitted
7513	Hexagon Head and slotted head thread cutting screws - dimensions, requirements and testing
7516	Cross recessed head thread cutting screws - dimensions, requirements and testing
7603	Ring Seals and Gaskets
7970	Threads and thread ends for tapping screws (modified version of ISO 1478)	1478
7971	Slotted Pan Head Tapping Screws	1481
7972	Slotted Countersunk Head Tapping Screws	1482
7973	Slotted Raised Countersunk Head Tapping Screws	1483
7976sources differ	Slotted set screws with cup point	1479	No modifications of dimensions	No modifications of dimensions
7977sources differ	Unhardened taper pins with external thread	8737	Technical delivery conditions partially changed	Technical delivery conditions partially changed	28737
7978sources differ	Unhardened taper pins with internal thread	8736	Dimensions partially changed	Dimensions partially changed	28736
7979sources differ	Parallel pins with internal thread	8735	Dimensions partially changed	Dimensions partially changed
7980	Spring Lock Washers with square ends for cheese head screws
7981sources differ	Cross recessed pan head tapping screws	7049	Marginal change of head dimensions. Caution with automatic feed and connection systems	Marginal change of head dimensions. Caution with automatic feed and connection systems
7982sources differ	Countersunk (flat) head tapping screws with cross recess	7050	Head dimensions and countersunk angles changed	Head dimensions and countersunk angles changed
7983sources differ	Raised countersunk (oval) head; tapping screws with cross recess	7051	Head dimensions and countersunk angles changed	Head dimensions and countersunk angles changed
7984	Hexagon Socket Thin Head Cap Screws
7985sources differ	Recessed raised cheese (fillister) head screws	7045	Nominal size changed; head dimension changed; thread length changed; penetration depth of cross slots changed	Nominal size changed; head dimension changed; thread length changed; penetration depth of cross slots changed
7989-1	Washers for steel structures - product grade C
7989-2	Washers for steel structures - product grade A
7991sources differ	Hexagon socket countersunk head screws	10462			10642
84sources differ	Slotted cheese head screws – Product grade A	1207	Modifications of dimensions < 2,5; dimension of slots changed; partly nominal lengths deleted; strength 8.8 deleted	Modifications of dimensions < 2,5; dimension of slots changed; partly nominal lengths deleted; strength 8.8 deleted
85sources differ	Slotted pan head screws – Product grade A	1580	Thread included; dimensions of head and slot changed; strength 8.8 deleted	Thread included; dimensions of head and slot changed; strength 8.8 deleted
9021sources differ	Washers; outside diameter ˜ 3 x bolt diameter	7093-1	Dimensions partially changed	Dimensions partially changed
908	Hexagon Socket Screw Plugs with parallel screw thread
910	Hexagon-duty hexagon Head Screw Plugs
911	Hexagon Socket Screw Keys	2936
912sources differ	Hexagon socket head cap screws	4762	Nominal size range changed; fine thread deleted (ISO 21269)	Nominal size range changed; fine thread deleted (ISO 21269)
913sources differ	Hexagon socket set screws with flat point	4026	Nominal sizes M1.4, M1.8, M14, M18 and M22 omitted	Nominal sizes M1.4, M1.8, M14, M18 and M22 omitted
914sources differ	Hexagon socket set screws with cone point	4027	Nominal sizes M1.4, M1.8, M14, M18 and M22 omitted	Nominal sizes M1.4, M1.8, M14, M18 and M22 omitted
915sources differ	Hexagon socket set screws with dog point	4028	Nominal sizes M1.4, M1.8, M14, M18 and M22 omitted	Nominal sizes M1.4, M1.8, M14, M18 and M22 omitted
916sources differ	Hexagon socket set screws with cup point	4029
918-3	Overview of European standards for fasteners
921	Slotted Pan Head Screws with large head
923	Slotted Pan Head Screws with shoulder
929	Hexagon Weld Nuts
93	Tab Washers with long tab
930	Fine thread pitch partially Threaded Screws
931sources differ	Partial thread hex bolts.	4014	Fully interchangeable
931-1sources differ	Hexagon head bolts with shank; M 1,6 to M 39 screw threads, Product grades A and B	4014	Nominal size extended; width across flats according to DIN ISO 272 included	Nominal size extended; width across flats according to DIN ISO 272 included
931-2	M42 to M160x6 Hexagon Cap Screws partially threaded - product grade B	4014
933sources differ	Hexagon head screws – Product grades A and B	4017	Nominal size extended; width across flats according to DIN ISO 272 included	Nominal size extended; width across flats according to DIN ISO 272 included
934sources differ	Hexagon nuts; Metric screw threads; Product grades A and B	4032	Nominal diameter changed, height of the nut changed partially; nuts with fine thread specified in DIN EN ISO 8673; width across flats according to DIN ISO 272 included	Nominal diameter changed, height of the nut changed partially; nuts with fine thread specified in DIN EN ISO 8673; width across flats according to DIN ISO 272 included
935-1	Hexagon Slotted Nuts and Castle Nuts with metric coarse and fine pitch thread - product grades A and B
935-2	M42 to M160x6 Hexagon Head Bolts; product grade B
935-3	Hexagon Slotted Nuts with metric coarse pitch thread - product grade C
936	M8 to M52 and M8x1 to M52x3 hexagon thin nuts; product grades A and B
937	Hexagon Thin Castle Nuts
938	Studs with a length of engagement equal to about 1 d
939	Studs with a length of engagement equal to about 1,25 d
94sources differ	Slotted set screws with long dog point	1234	No modifications of dimensions	No modifications of dimensions
95	Slotted Raised Countersunk (oval) Head Wood Screws
96	Slotted Round Head Wood Screws
960sources differ	Hexagon bolts, Metric fine thread, Types m and mg	8765	Nominal size extended; width across flats according to DIN ISO 272 included	Nominal size extended; width across flats according to DIN ISO 272 included
961sources differ	M 8×1 to M 100×4 hexagon head bolts with fine pitch thread	8676	Nominal size extended; width across flats according to DIN ISO 272 included	Nominal size extended; width across flats according to DIN ISO 272 included
962	Designation system for fasteners
963sources differ	Slotted countersunk (flat) head screws (Countersunk heads according to ISO)	2009	Nominal size changed; head dimension changed; thread length changed; strength 8.8 cancelled	Nominal size changed; head dimension changed; thread length changed; strength 8.8 cancelled
964sources differ	Slotted raised countersunk (oval) head screws (Countersunk heads according to ISO)	2010	Nominal size changed; head dimension changed; thread length changed; strength 8.8 cancelled	Nominal size changed; head dimension changed; thread length changed; strength 8.8 cancelled
965sources differ	Cross recessed countersunk (flat) head screws (Countersunk heads according to ISO)	7046-1	Nominal size changed; head dimension changed; thread length changed; strength 8.8 included (see Part 2); penetration depth of cross slots changed	Nominal size changed; head dimension changed; thread length changed; strength 8.8 included (see Part 2); penetration depth of cross slots changed
966sources differ	Cross recessed countersunk (oval) head screws (Countersunk heads according to ISO)	7047	Nominal size changed; head dimension changed; thread length changed; strength 8.8 omitted; penetration depth of cross slots changed	Nominal size changed; head dimension changed; thread length changed; strength 8.8 omitted; penetration depth of cross slots changed
970	Hexagon Nuts; style 1; metric coarse thread, product grades A and B; ISO 4032 modified	4032
971-1	Style 1 Hexagon Nuts with metric fine pitch thread; property classes 6 and 8	8673
971-2	Style 2 Hexagon Nuts with metric fine pitch thread; property classes 10 and 12	8674
972	M5 to M39 Hexagon Nuts; style 1; product grade C (modified version of ISO 4034)	4034
975	Threaded Rods
976-1	Metric thread Stud Bolts
976-2	Metric interference-fit thread Stud Bolts
977sources differ	Weld bosses/OD differ by series.	21670	Check spec
979	Hexagon Thin Slotted Nuts and Castle Nuts with metric coarse and fine pitch thread - Product grades A and B
980sources differ	All-metal prevailing torque type hexagon nuts	7042	Height of nut changed; width across flat according to ISO 272 included	Height of nut changed; width across flat according to ISO 272 included
980, 6925	Prevail torque requirements vary.	7042, 10513	Check spec
981	Locknuts for use with rolling bearings
982sources differ	Prevailing torque type hexagon nuts with non-metallic insert	7040	Height of nut changed; width across flat according to ISO 272 included	Height of nut changed; width across flat according to ISO 272 included
982, 6924	Insert height/torque windows.	7040, 10512	Check spec
983	Retaining Rings with lugs for use on shafts (external circlips)
985sources differ	Prevailing torque type hexagon thin nuts with non-metallic insert	10511	Height of nut changed; width across flat according to ISO 272 included	Height of nut changed; width across flat according to ISO 272 included
986	Prevailing torque type Hexagon Domed Cap Nuts with non-metallic insert
988	Shim Rings and supporting rings

Where this came from

Every record above links the page it was taken from and quotes the sentence that states it. These are the 5 sources this dataset was assembled from.

fullerfasteners.comhttps://fullerfasteners.com/tech/din-iso-en-crossover-chart/
trfastenings.comhttps://www.trfastenings.com/knowledge-base/engineering-data/fastener-standards
monsterbolts.comhttps://monsterbolts.com/pages/common-din-numbers-for-metric-fasteners
wuerth.dehttps://www.wuerth.de/web/de/awkg/kompetenz/din_iso_normteile/din-933-931-iso-4014-4017-sechskantschrauben.php
dinmedia.dehttps://www.dinmedia.de/en/standard/din-933/3071389

Machine-readable

data.jsonThe whole dataset — every record with its source URL and source quote.
Open Knowledge Format bundleOne JSON object per line — every record's frontmatter and quoted span exactly as it is held here, in one fetch.
How this is made and checkedWhat "verified against source" does and does not mean.

164 records. last verified against source 2026-08-12. due for re-check by 2028-08-11.

Licence. Factual compilation with source citations. The DIN-to-ISO equivalence is a fact about which standard number maps to which; short attributed quotes link back to the published chart or page. No standard text is reproduced.