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Standards reference

Fastener standards, explained by the people who process to them

What each specification covers, what it deliberately does not cover, and exactly what has to appear on the drawing before it becomes actionable.

A standard number on a purchase order is not a specification. These pages summarise the scope and practical application of the documents a screw, nut and bolt plant works to every day, and list the lines a buyer must write for the requirement to be quotable, inspectable and defensible.

Standards are copyrighted documents. We explain scope, intent and practical application in our own words; obtain the current edition from ISO, ASTM, DIN or your national standards body.

Standards reference

Standards index

Scroll the table sideways on a narrow screen.

Standards index
StandardWhat it governsFamilyProcess it belongs toAlso written as
ISO 898-1property classes for carbon and alloy steel bolts, screws and studsMechanical propertiesHeat TreatmentISO 898-1:2013, EN ISO 898-1, JIS B 1051, SAE J429 (inch counterpart)
ISO 898-2nuts with specified property classes and proof load valuesMechanical propertiesHeat TreatmentISO 898-2:2022, ISO 898-2:2012 (superseded), ISO 898-6 (merged into Part 2), JIS B 1052-2, ASTM A563 (inch counterpart)
ISO 4042electroplated coating systems for fasteners, and hydrogen embrittlement reliefElectroplating and coatingZinc Plating Cr3+ISO 4042:2022, ISO 4042:2018 (superseded), ISO 4042:1999 (superseded), EN ISO 4042
ISO 2081electroplated zinc coatings on iron and steel with supplementary treatmentsElectroplating and coatingZinc Plating Cr3+ISO 2081:2025, ISO 2081:2018 (superseded), ISO 2081:2008 (superseded), ISO 19598 (Zn and Zn-alloy, Cr(VI)-free)
ASTM B633electrodeposited zinc on iron and steel: SC1–SC4 and the TypesElectroplating and coatingZinc Plating Cr3+ASTM B633 (current revision), ISO 2081 (ISO counterpart), ASTM B695 (mechanically deposited zinc)
ASTM F1941 / F1941Melectrodeposited coatings on threaded fastenersElectroplating and coatingZinc Plating Cr3+ASTM F1941 (inch, UN/UNR), ASTM F1941M (metric), ASTM B850 (baking guidance), ASTM F1940 (process qualification)
ISO 10683non-electrolytic zinc flake coating systems for fastenersElectroplating and coatingZinc Plating Cr3+ISO 10683:2018, EN ISO 10683, ASTM F1136 (Zn/Al flake, inch)
ISO 15330preloading test for the detection of hydrogen embrittlementTesting and measurementZinc Plating Cr3+ISO 15330:1999, ASTM F606 / F606M (test methods), ASTM F1940 (process qualification)
DIN 50942 / ISO 9717phosphate conversion coatings on metalsPhosphate conversion coatingPhosphate CoatingDIN 50942, ISO 9717, EN ISO 9717, TT-C-490 (US paint pretreatment)
MIL-DTL-16232heavy phosphate coatings with supplementary oilPhosphate conversion coatingPhosphate CoatingMIL-DTL-16232G, MIL-P-16232 (superseded), TT-C-490 (related pretreatment)
ISO 9227 / ASTM B117neutral salt spray (NSS) testingTesting and measurementTesting LaboratoryISO 9227 (NSS / AASS / CASS), ASTM B117, JIS Z 2371, ASTM G85 (modified salt spray)
ISO 6507 / ISO 6508Vickers and Rockwell hardness testingTesting and measurementTesting LaboratoryISO 6507-1 (Vickers), ISO 6508-1 (Rockwell), ASTM E384 / ASTM E18, JIS Z 2244 / JIS Z 2245
ISO 2639determination of effective case depth after carburizingTesting and measurementHeat TreatmentISO 2639:2002, DIN 50190-1, SAE J423, ASTM E384 (microhardness)
ISO 3497coating thickness measurement by X-ray spectrometric methodsTesting and measurementTesting LaboratoryISO 3497, ASTM B568 (XRF), ISO 1463 (microsection), ISO 2177 (coulometric)
ISO 3506property classes for corrosion-resistant stainless steel fastenersMechanical propertiesHeat TreatmentISO 3506-1 (bolts, screws, studs), ISO 3506-2 (nuts), ISO 3506-3 (set screws), ISO 3506-4 (tapping screws), EN ISO 3506, JIS B 1054-1, ASTM F593 / F594 (inch counterpart), มอก. 2453 เล่ม 1-2552
JIS B 1051the Japanese property-class standard for carbon and alloy steel fastenersMechanical propertiesHeat TreatmentJIS B 1051 (強度区分), JIS B 1052-2 (nuts), JIS B 1054-1 (stainless), JIS B 1044 (electroplated coatings), JIS H 0404 (plating symbols), ISO 898-1 (source document)
SAE J429inch fastener grades 2, 5 and 8, and how they sit next to a metric classMechanical propertiesHeat TreatmentSAE J429 (current revision), SAE J995 (nuts), ASTM A307 / A449 / A354, ASTM F3125 (formerly A325 / A490), ASTM F606 (test methods), ISO 898-1 (metric counterpart)
ISO 965metric thread tolerances 6H, 6g, 6e and 6G, and where the room for plating comes fromTesting and measurementZinc Plating Cr3+ISO 965-1 (principles and basic data), ISO 965-2 (limits of size, general purpose), ISO 965-3 (constructional threads), ISO 261 / ISO 262 (thread series), JIS B 0209, มอก. 339
DIN 50979the German designation system for zinc and zinc-alloy coatings with Cr(VI)-free passivationElectroplating and coatingZinc Plating Cr3+DIN 50979:2009 and later, ISO 19598 (ISO counterpart), DIN EN ISO 4042, DIN 267-9 / DIN 267 Teil 9 (superseded predecessor)
มอก. (TIS)the Thai national standards that touch fasteners and coatings, and how to check a มอก. claimMechanical propertiesHeat TreatmentTIS, สมอ. / TISI, มอก.บังคับ (compulsory), มอก.ทั่วไป (voluntary), Thai Industrial Standards Institute
ASTM F606 / F606Mhow fastener mechanical properties are actually measuredTesting and measurementTesting LaboratoryASTM F606 (inch series), ASTM F606M (metric series), ASTM F606/F606M (combined designation), ASTM E8 / E8M (machined specimens), SAE J429 (inch property values), ASTM A563 (nut property values), ASTM F3125 (structural bolting), ASTM F436 (hardened washers), ISO 898-1 (metric system, methods included)
DIN 267the German technical delivery conditions series: which parts are withdrawn, which are still in forceElectroplating and coatingZinc Plating Cr3+DIN 267 (Mechanische Verbindungselemente — Technische Lieferbedingungen), DIN 267 Teil 9 / DIN 267-9 (withdrawn), DIN 267-2:2017-06 (current — surface roughness), DIN 267-27 / DIN 267-28 (current — coated screws), DIN 267-30 / DIN 267-31 (current — thread-rolling screws 10.9), DIN ISO 8992 (general requirements today)
DIN 50938black oxide (Brünieren) on iron and steel, and what the black finish really isPhosphate conversion coatingPhosphate CoatingBrünieren (black oxide, blackening, bluing), ISO 11408 (black oxide coating on iron and steel), MIL-DTL-13924 (US counterpart; formerly MIL-C-13924), AMS 2485 (aerospace black oxide), Fe3O4 conversion coating, รมดำ / ชุบดำ · 发黑 · 發黑 · 黒染め（四三酸化鉄被膜） · 흑착색 / 사삼산화철피막
MIL-DTL-13924reading a defence black oxide callout and turning it into an orderPhosphate conversion coatingPhosphate CoatingMIL-C-13924 (older designation still printed on drawings), MIL-DTL-13924 Class 1, MIL-PRF-16173 (preservative frequently called up alongside it), ISO 11408 (ISO black oxide document), DIN 50938 (European process document), AMS 2485 (aerospace black oxide)
ISO 18203determination of the thickness of surface-hardened layersTesting and measurementHeat TreatmentEN ISO 18203, ISO 2639 (case hardening depth — superseded by this document), ISO 3754 (surface hardening depth — superseded by this document), DIN 50190-1 / -2 / -3 (Eht · Rht · Nht), SAE J423 (inch practice for measuring case depth), ISO 6507-1 (the hardness test the traverse is made with)

Values on this page are typical industry figures that depend on the part, the coating system and the governing specification. They are not guarantees. Always confirm against the edition in force and the customer drawing — this page does not replace either.

Every standard, grouped by what it controls

Mechanical properties

ISO 898-1

property classes for carbon and alloy steel bolts, screws and studs

What ISO 898-1 actually requires: the property class table, hardness limits, minimum tempering temperature, surface-vs-core hardness and decarburization rules, and what to write on the drawing.

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ISO 898-2

nuts with specified property classes and proof load values

How ISO 898-2 nut classes work: proof load values, mating bolt classes, style 1 versus style 2, thin nuts, and what a drawing must state before a nut order is quotable.

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ISO 3506

property classes for corrosion-resistant stainless steel fasteners

What A2-70 and A4-80 actually promise: the steel groups behind the letters, the property class table, why austenitic strength comes from cold work, and what a drawing must state.

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JIS B 1051

the Japanese property-class standard for carbon and alloy steel fasteners

What JIS B 1051 requires, how it lines up with ISO 898-1, what the old 4T / 8T / 10T grades on Japanese drawings mean, and which JIS number covers each requirement.

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SAE J429

inch fastener grades 2, 5 and 8, and how they sit next to a metric class

What SAE J429 grades 2, 5 and 8 require: proof load, yield, tensile and hardness by diameter, the radial head marks, the matching nut and washer documents, and what to write on the drawing.

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มอก. (TIS)

the Thai national standards that touch fasteners and coatings, and how to check a มอก. claim

What มอก. is, which TIS numbers cover fastener properties, threads, stainless and coatings, the difference between compulsory and voluntary มอก., and how a Thai buyer verifies a claim.

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Electroplating and coating

ISO 4042

electroplated coating systems for fasteners, and hydrogen embrittlement relief

What ISO 4042 requires: coating system designation, how much plating a thread can physically accept, the hydrogen-embrittlement relief trigger and bake window, and what to state on the drawing.

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ISO 2081

electroplated zinc coatings on iron and steel with supplementary treatments

ISO 2081 in practice: local minimum thickness on significant surfaces, the designation system, Cr(VI)-free passivation and sealers, measurement methods, and how it maps onto ASTM B633.

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ASTM B633

electrodeposited zinc on iron and steel: SC1–SC4 and the Types

ASTM B633 service conditions and thickness in µm and inches, what the Types mean, why the salt-spray requirement is a process check, and what a drawing must state.

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ASTM F1941 / F1941M

electrodeposited coatings on threaded fasteners

The fastener-specific plating standard: how thread fit limits coating thickness, when de-embrittlement baking is required, how B850 and F1940 relate, and what to put on the order.

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ISO 10683

non-electrolytic zinc flake coating systems for fasteners

When zinc flake is the right route instead of electroplating: no electrolytic hydrogen charging, typical thickness, corrosion classes and friction requirements, and what to specify.

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DIN 50979

the German designation system for zinc and zinc-alloy coatings with Cr(VI)-free passivation

How a DIN 50979 coating code is built, what each field fixes, how An, Cn and Fn differ, what T0 and T2 mean, and how the code relates to ISO 19598 and ISO 4042.

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DIN 267

the German technical delivery conditions series: which parts are withdrawn, which are still in force

DIN 267 is a series, not one standard. Which parts are withdrawn and what carries the subject now, which parts are still in force, and how Part 9 became ISO 4042 plus DIN 50979 and ISO 19598.

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Phosphate conversion coating

DIN 50942 / ISO 9717

phosphate conversion coatings on metals

How phosphate coatings are actually specified: coating mass in g/m² rather than colour, zinc versus manganese, the role of the supplementary oil, and what to write on the drawing.

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MIL-DTL-16232

heavy phosphate coatings with supplementary oil

The US defence detail specification for heavy phosphate coatings: what Type and Class mean, typical minimum coating mass, thread effects, and why "Type M" alone is not a specification.

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DIN 50938

black oxide (Brünieren) on iron and steel, and what the black finish really is

What Brünieren to DIN 50938 actually produces: a magnetite film grown out of the steel, its real thickness, the corrosion protection it does and does not give, why oil or wax follows, and how to specify it.

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MIL-DTL-13924

reading a defence black oxide callout and turning it into an order

How to read "black oxide per MIL-DTL-13924": why the class is a statement about your material, why the corrosion protection is the oil and not the black, what a defence number does not buy, and the ISO / DIN documents it maps onto.

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Testing and measurement

ISO 15330

preloading test for the detection of hydrogen embrittlement

How the ISO 15330 parallel bearing surface preloading test works, what a pass really proves, how it differs from ASTM F1940 process qualification, and what to specify.

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ISO 9227 / ASTM B117

neutral salt spray (NSS) testing

Salt spray explained for fastener QC: the cabinet conditions in both standards side by side, why hours are not service life, and how to write an acceptance criterion that survives an argument.

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ISO 6507 / ISO 6508

Vickers and Rockwell hardness testing

Vickers and Rockwell for fastener QC: why the test force belongs in the result, when HRC is not valid on small parts, surface preparation, and how to write a hardness callout.

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ISO 2639

determination of effective case depth after carburizing

Effective versus total case depth, the 550 HV 1 default limit hardness, where on a fastener the traverse is taken, and the exact wording that makes a case-depth requirement unambiguous.

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ISO 3497

coating thickness measurement by X-ray spectrometric methods

How XRF thickness measurement is specified and where it goes wrong: spot size on curved and threaded surfaces, calibration standards, counting time, and the referee methods.

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ISO 965

metric thread tolerances 6H, 6g, 6e and 6G, and where the room for plating comes from

How ISO 965 tolerance positions and grades work, the fundamental deviation values by pitch that decide how much coating a thread can take, and what to write so a plated thread still gauges.

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ASTM F606 / F606M

how fastener mechanical properties are actually measured

The certificate says F606. This page says what was done to the bolt: proof load measured as a change in length, wedge tension pulling the head off-axis, machined specimens, nut proof load on a mandrel, and where hardness is read.

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ISO 18203

determination of the thickness of surface-hardened layers

The current number for hardened-depth measurement on steel: which designation belongs to which process, why each one carries a different limit hardness, how the depth is read off the traverse, and the one string that makes a drawing callout unambiguous.

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