ISO Screw Thread Standards Index — Complete List with Scope Summaries (M, Inch, Tr, Miniature, Gaging)
Complete index of the ISO screw thread standards — the metric M profile family (ISO 68-1, 261, 262, 724, the five-part ISO 965 tolerance system including its hot-dip galvanizing pair), the inch family (ISO 68-2, 263, 725, 5864), the trapezoidal Tr lead-screw set (ISO 2901-2904), miniature threads (ISO 1501), gaging (ISO 1502), measuring wires (ISO 16239) and vocabulary (ISO 5408) — with edition year and a one-line scope summary per document, transcribed row-for-row from the collected index.
Last updated: 2026-11
Specifications
The metric thread world routes through ISO documents the way the inch world routes through the ASME B1 series — and this index lines up all 21 of them with edition years and one-line scopes, so a thread question can be sent to the right document before anyone opens a standard. The backbone: ISO 68-1 fixes the metric basic profile and ISO 261 the diameter-pitch plan that M-designations live in; ISO 262 selects the preferred sizes from M1 to M64 (the sizes bolts and nuts actually come in); ISO 724 prints the basic dimensions and ISO 965-1/-2 carry the tolerance system whose 5H/6H/7H/6g classes every metric drawing assumes. The 965 family is worth reading as a system: -1 principles, -2 limits of size for general-purpose work, -3 deviations for constructional threads, and the -4/-5 pair that handles hot-dip galvanizing — external threads cut oversize to mate with H or G internals, and the internals to match them — the pair you need when fasteners are galvanized after threading. Around the backbone: the inch family (ISO 68-2, 263, 725, 5864) for the inch-series work ISO still covers; the trapezoidal Tr lead-screw set (2901-2904), the metric counterpart to Acme; ISO 1501 miniature threads 0.3-1.4 mm; ISO 1502 gaging; ISO 16239 measuring wires for the three-wire method; and ISO 5408 vocabulary fixing what "pitch", "flank" and "effective diameter" mean. Edition years are the tabulated editions — consult the latest ISO publication for design.
| Coverage | 21 ISO documents: metric M family (68-1, 261, 262, 724, 965-1/-2/-3/-4/-5), inch family (68-2, 263, 725, 5864), trapezoidal Tr (2901, 2902, 2903, 2904), miniature (1501), gaging (1502), measuring wires (16239), vocabulary (5408) |
|---|---|
| Per-document data | Designation with edition year, full name, one-line scope summary — e.g. ISO 965-4:1998, "ISO metric screw threads — Tolerances — Part 4: Hot-dip galvanized external threads" |
| Galvanizing pair | ISO 965-4 (external threads to mate with H or G internal) + ISO 965-5 (internal threads to mate with h externals before galvanizing) — read together when fasteners are hot-dip galvanized after threading |
| Edition currency | Year column shows the tabulated edition; later ISO revisions may exist — consult the latest publication for design |
| Standard | Name | Summary |
|---|---|---|
| ISO 68-1:1998 | ISO general-purpose screw threads — Basic profile — Part 1: Metric | Defines the basic profile for ISO metric threads (M). |
| ISO 68-2:1998 | ISO general-purpose screw threads — Basic profile — Part 2: Inch | Defines the basic profile for ISO inch threads. |
| ISO 261:1998 | ISO general-purpose metric screw threads — General plan | Defines ISO metric thread plan; links to basic dimensions (ISO 724) and tolerances (ISO 965). |
| ISO 262:1998 | ISO general-purpose metric screw threads — Selected sizes | Preferred sizes for screws/bolts/nuts from 1 to 64 mm. |
| ISO 263:1973 | ISO inch screw threads — General plan & selection (0.06–6 in) | Inch series plan and designations (non-pipe threads). |
| ISO 724:1993 | ISO general-purpose metric screw threads — Basic dimensions | Basic dimensions for ISO metric threads (per ISO 68-1/261). |
| ISO 725:2009 | ISO inch screw threads — Basic dimensions | Basic dimensions for ISO inch threads (per ISO 68-2/263). |
| ISO 965-1:2013 | ISO metric screw threads — Tolerances — Part 1: Principles & basic data | Principles and basic data for ISO metric thread tolerances. |
| ISO 965-2:1998 | ISO metric screw threads — Tolerances — Part 2: Limits of sizes (general purpose) | Limits of sizes for external/internal threads (medium quality). |
| ISO 965-3:1998 | ISO metric screw threads — Tolerances — Part 3: Deviations for constructional threads | Deviations for constructional uses (per ISO 261; ISO 68-1 profile). |
| ISO 965-4:1998 | ISO metric screw threads — Tolerances — Part 4: Hot-dip galvanized external threads | Limits for galvanized external threads mating with H or G internal threads. |
| ISO 965-5:1998 | ISO metric screw threads — Tolerances — Part 5: Internal threads to mate with galvanized externals | Limits for internal threads to mate with tolerance h external threads before galvanizing. |
| ISO 2901:1993 | ISO metric trapezoidal screw threads — Basic & maximum material profiles | Defines basic and maximum material profiles for Tr threads. |
| ISO 2902:1977 | ISO metric trapezoidal screw threads — General plan | Series of diameter/pitch combinations for trapezoidal threads. |
| ISO 2903:1993 | ISO metric trapezoidal screw threads — Tolerances | Tolerance system for Tr threads (lead screws & special axial displacement not covered). |
| ISO 2904:1977 | ISO metric trapezoidal screw threads — Basic dimensions | Basic dimensions for Tr threads (per ISO 2902 plan). |
| ISO 1501:2009 | ISO miniature screw threads | Profiles, diameter-pitch sets, dimensions and tolerances for 0.3–1.4 mm miniature threads. |
| ISO 1502:1996 | ISO general-purpose metric screw threads — Gauges & gauging | Manufacture and use of gauges for checking ISO metric threads (external & internal). |
| ISO 5408:2009 | Screw threads — Vocabulary | Fundamental terminology for symmetrical/unsymmetrical, cylindrical/tapered threads. |
| ISO 5864:1993 | ISO inch screw threads — Allowances & tolerances | System of allowances/tolerances for standard inch thread series (0.06–6 in). |
| ISO 16239:2013 | Metric series wires for measuring screw threads | Material, nominal diameters, tolerances, and designation for thread-measuring wires. |
Materials
- Not applicable — reference index; the underlying thread dimension charts live on this catalog's per-standard thread pages
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 Screw Thread Standards Index — Complete List with Scope Summaries (M, Inch, Tr, Miniature, Gaging)) 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 10,000 pieces. Stock items run 3–7 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
How do I route a metric thread question through this index, and which documents matter when galvanized fasteners are involved?
Route by question: what the thread looks like — ISO 68-1 (profile) and 261 (plan); which size to call out — ISO 262 (preferred selections); what the dimensions are — ISO 724; how tight it fits — ISO 965-1 for the tolerance principle and 965-2 for the actual limits behind the 6H/6g classes a drawing names; how it is inspected — ISO 1502 gaging or ISO 16239 wire measurement. The galvanizing case is the one that genuinely needs the deep cuts: a fastener hot-dip galvanized after threading grows by zinc buildup, so ISO 965-4 shifts the external thread limits to leave room — mating it with a plain 6H nut gives an interference of zinc, not thread — and 965-5 defines the H or G internal threads that pair with it, while 965-5 additionally covers the reverse case of internal threads sized to accept h-tolerance externals that will be galvanized later. Two boundary notes: the trapezoidal Tr documents (2901-2904) are the lead-screw family and unrelated to M-profile fastener threads despite the shared metric vocabulary; and the tabulated years are editions, not the latest status — ISO documents revise, so confirm currency with ISO before designing to a summary here.
What is the MOQ and lead time for threaded parts and tooling referenced by this chart?
The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Confirm the exact schedule against quantity, size mix and any tooling items at quotation.
Related knowledge
- Thread-Forming vs Thread-Cutting vs Thread-Rolling Self-Tapping Screws: What the Evidence Settles on Base Material
- Screw Family Selection by Base Material: Wood, Machine and Self-Tapping Threads, Engagement and Coating
- Hex Bolts vs Socket Head Cap Screws: What the Evidence Settles on Strength, Clearance and Cost
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