What Are ISO Standards for Fasteners?
ISO standards for fasteners are developed and published by the International Organization for Standardization (ISO), an independent, international body that creates globally accepted standards across a wide range of manufacturing and industrial sectors. While fasteners represent only a small portion of ISO’s vast standards portfolio, ISO fastener standards are among the most widely adopted in global engineering and construction.
ISO began developing fastener standards nearly 5 decades ago, with the goal of creating a unified system for dimensions, mechanical properties, tolerances, and performance requirements. Over time, ISO bolt standards, nut specifications, and screw standards have become the preferred regulatory framework for assembling internationally traded goods.
Today, ISO standards are extensively used in cross-border manufacturing, EPC projects, export-oriented industries, and multinational infrastructure developments. Many regulatory bodies and manufacturers actively encourage the use of ISO standards over region-specific systems to ensure uniformity, interchangeability, and global compatibility of fasteners.
ISO Fastener Standards List
| ISO Standard | Description |
|---|---|
| ISO 1051 A | Flat round head rivets |
| ISO 1051 B | Round head rivets |
| ISO 1051 C | Countersunk head rivets |
| ISO 1207 | Slotted cheese head screws |
| ISO 1234 | Split pins |
| ISO 1479 | Hexagon head self tapping screws |
| ISO 1481 | Tapping screws, slotted pan head |
| ISO 1482 | Slotted countersunk head tapping screws |
| ISO 1483 | Slotted raised countersunk head tapping screws |
| ISO 1580 | Slotted pan head screws |
| ISO 10511 | Prevailing torque type hexagon thin nuts |
| ISO 10512 | Prevailing torque type hexagon regular nuts |
| ISO 10513 | Prevailing torque type all-metal hexagon high nuts with metric fine pitch thread |
| ISO 10642 | Hexagon socket countersunk head cap screws |
| ISO 10670 | Conical spring washers |
| ISO 13337 | Spring-type straight pins |
| ISO 13918 | Welding studs and ceramic ferrules for arc stud welding |
| ISO 14579 | Hexalobular cylindrical head |
| ISO 14580 TX | Cylinder screw low head TORX drive |
| ISO 14581 | Hexalobular socket countersunk flat head screws |
| ISO 14582 | Hexalobular socket countersunk flat head screws, high head |
| ISO 14583 | Hexalobular raised countersunk head |
| ISO 14584 | Hexalobular socket raised countersunk head screws |
| ISO 14585 | Hexalobular pan head |
| ISO 14586 | Hexalobular countersunk head |
| ISO 14587 | Hexalobular socket raised countersunk (oval) head tapping screws |
| ISO 15071 | Hexalobular socket raised countersunk (oval) head tapping screws |
| ISO 15072 | Hexagon bolts with flange with metric fine pitch thread |
| ISO 15480 | Thread forming screws for metric ISO threads |
| ISO 15482 | Cross recessed countersunk head drilling screws with tapping screw thread |
| ISO 15481 | Cross recessed pan head drilling screws with tapping screw thread |
| ISO 15983 | Break mandrel blind rivets |
| ISO 299 | Nuts for T-slots |
| ISO 2009 | Slotted countersunk head screws |
| ISO 2010 | Slotted raised countersunk oval head screws |
| ISO 2339 | Taper pins |
| ISO 2340 | Clevis pins without head |
| ISO 2341 | Clevis pins with head |
| ISO 2342 | Slotted headless screws – Marks series |
| ISO 2491 | Thin parallel keys and corresponding keyways |
| ISO 2936 | Assembly tools for screws and nuts – Hexagon socket screw keys |
| ISO 3912 | Woodruff keys and keyways |
| ISO 4014 | Hexagon head bolts with shank |
| ISO 4016 | Hexagon head bolts with nut, production class C |
| ISO 4017 | Hexagon head bolts with full thread |
| ISO 4018 | Hexagon screws, production class C |
| ISO 4026 | Hexagon socket set screws with flat point |
| ISO 4027 | Hexagon socket set screws with cone point |
| ISO 4028 | Hexagon socket set screws with full dog point |
| ISO 4029 | Hexagon socket set screws with cup point |
| ISO 4032 | Hexagon nuts |
| ISO 4033 | Hexagon high nuts (style 2 – Product grades A and B) |
| ISO 4034 | Hexagon nuts, product class C |
| ISO 4035 | Hexagon thin nuts (chamfered) |
| ISO 4161 | Hexagon nuts with flange |
| ISO 4762 | Hexagon socket head cap screws |
| ISO 4766 | Slotted nuts |
| ISO 4775 | Hexagon nuts with large width across flats for high voltage connections |
| ISO 773 | Rectangular or square parallel keys |
| ISO 774 | Taper keys with or without gib head |
| ISO 7035 | Hexagon slotted castle nuts |
| ISO 7036 | Hexagon slotted castle nuts, high type (metric) |
| ISO 7037 | Hexagon high slotted castle nuts |
| ISO 7038 | Hexagon thin slotted castle nuts |
| ISO 7040 | Prevailing torque nuts with non-metallic insert |
| ISO 7041 | Prevailing torque type hexagon nuts (non-metallic insert) |
| ISO 7042 | Hexagon nuts with clamping part, all-metal nut |
| ISO 7045 | Cross recessed raised cheese head screws |
| ISO 7046 | Cross recessed countersunk flat head screws |
| ISO 7047 | Cross recessed raised countersunk head screws |
| ISO 7048 | Cross recessed cheese head screws |
| ISO 7049 | Pan head tapping screws with cross recess |
| ISO 7050 | Cross recessed countersunk head tapping screws |
| ISO 7051 | Countersunk flat head tapping screws with cross recess |
| ISO 7089 | Plain washers, Form A |
| ISO 7090 | Plain washers, Form B |
| ISO 7091 | Plain washers |
| ISO 7092 | Washers for cheese head screws |
| ISO 7093 | Plain washers, outer diameter about 3d |
| ISO 7094 | Washers for use in timber constructions |
| ISO 7379 | Hex-shoulder screws with hexagon socket |
| ISO 7380 | Hexagon socket button head screws |
| ISO 7380 FL | Flange button head hexagon socket cap screws |
| ISO 7380 TFL | Flange button head TORX cap screws |
| ISO 7380 TX | Pan head screws with TORX drive |
| ISO 7411 | High-strength injection structural bolts |
| ISO 7416 | Slotted, round, for HV connections |
| ISO 7434 | Slotted set screws with dog point |
| ISO 7435 | Slotted set screws with flat point |
| ISO 7436 | Slotted set screws with cup point |
| ISO 8673 | Hexagon nuts with metric coarse and fine pitch thread |
| ISO 8675 | Hex nuts low form with metric fine pitch thread |
| ISO 8676 | Hex cap screws, metric fine thread |
| ISO 8677 | Mushroom head square neck bolts |
| ISO 8733 | Parallel pins with internal thread |
| ISO 8734 | Dowel pins |
| ISO 8735 | Parallel pins with internal thread |
| ISO 8736 | Taper pins with internal thread |
| ISO 8737 | Taper pins with external thread |
| ISO 8738 | Medium type washers for pins |
| ISO 8740 | Cylindrical grooved pins |
| ISO 8741 | Grooved pins full length parallel |
| ISO 8742 | Grooved pins, third length centre-grooved |
| ISO 8744 | Grooved pins, full length taper-grooved |
| ISO 8745 | Parallel grooved pins |
| ISO 8746 | Round head grooved pins |
| ISO 8747 | Countersunk head grooved pins |
| ISO 8748 | Spiral dowel pins, heavy duty |
| ISO 8750 | Spiral spring pins, roll pins |
| ISO 8752 | Spring-type straight pins (roll pins) – heavy type |
| ISO 8765 | Partially threaded hex cap screws (fine thread) |
| ISO 21269 | Hexagon socket head cap screws with metric fine pitch thread |
These ISO standards list entries are widely referenced in international engineering drawings, procurement documents, and quality specifications.
Why Are ISO Standards for Fasteners Important?
The importance of adhering to an ISO standard for fasteners rests on two primary pillars: quality and consistency.
- Quality Assurance : ISO standards provide a framework for manufacturers to examine and assess their fasteners during all stages of production. This rigorous assessment ensures the creation of high-quality, strong fasteners capable of assembling products that remain durable and safe for long-term use.
- Global Consistency : In terms of consistency, ISO standards provide a universal basis for both national and international regulation. When fasteners are manufactured to the same worldwide standards, it significantly reduces barriers to international trade, saving valuable time and energy for engineers and procurement teams.
ISO vs Other Fastener Standards
ISO standards are often compared and used alongside other international and regional fastener standards.
| Aspect | ISO Standards | ASTM / DIN / IS |
|---|---|---|
| Governing Body | International Organization for Standardization | Regional / National bodies |
| Usage Region | Worldwide | Region-specific |
| Primary Focus | Global interchangeability | Local compliance |
| Common Industries | EPC, exports, automotive | Infrastructure, domestic projects |
| Used Together | Yes | Yes |
In practice, ISO fasteners may follow ISO dimensional standards while using ASTM or DIN material grades to meet project-specific requirements.
Applications of ISO Standard Fasteners
ISO standard fasteners are extensively used in:
- International infrastructure projects
- Oil & gas and petrochemical plants
- Power generation and transmission
- Automotive and heavy machinery manufacturing
- EPC and export-oriented projects
ISO Fasteners Supplied by Jade Alloys
Jade Alloys manufactures and supplies a comprehensive range of ISO standard fasteners for global industries, ensuring compliance with international quality and performance requirements.
Our Capabilities Include:
- Manufacturing as per major ISO bolt standards and ISO fastener specifications
- Property classes including 8.8, 10.9, 12.9, A2-70, A4-80
- Carbon steel, alloy steel, and stainless steel grades
- Full traceability with Material Test Certificates (MTC)
- Surface finishes such as Black, Zinc Plated, Hot Dip Galvanized, and PTFE
