Our manufacturing and quality systems are aligned with ISO, ASTM, DIN, and JIS international standards. Use the interactive database below to search, filter, and explore standard specifications relevant to your fastener requirements. Click any standard card to expand detailed data tables.
Standards Database
Search and filter by standard system — click a card to expand
Defines mechanical and physical properties for bolts, screws, and studs made of carbon steel and alloy steel with coarse and fine pitch threads. The most fundamental standard for metric fastener strength grading.
| Property Class | Tensile Strength Rm | Yield Strength Rp0.2 | Hardness HRC | Elongation A% | Material |
|---|---|---|---|---|---|
| 4.6 | 400 MPa | 240 MPa | — | 22 | Low carbon steel |
| 4.8 | 400 MPa | 320 MPa | — | 14 | Low carbon steel |
| 5.8 | 500 MPa | 400 MPa | — | 10 | Low/medium carbon steel |
| 8.8 | 800 MPa | 640 MPa | 22 – 32 | 12 | Medium carbon steel, Q&T |
| 10.9 | 1040 MPa | 940 MPa | 32 – 39 | 9 | Alloy steel, Q&T |
| 12.9 | 1220 MPa | 1100 MPa | 39 – 44 | 8 | Alloy steel, Q&T |
Q&T = Quenched and Tempered. Classes 8.8 and above require heat treatment. Maximum hardness limits apply to reduce hydrogen embrittlement risk.
Covers bolts, screws, studs, and nuts made from austenitic, martensitic, and ferritic stainless steel grades. Key for applications requiring corrosion resistance.
| Steel Grade | Property Class | Tensile Rm | Stress at 0.2% | Elongation | Typical Use |
|---|---|---|---|---|---|
| A2 (304) | 50 | 500 MPa | 210 MPa | 0.6d | General purpose |
| A2 (304) | 70 | 700 MPa | 450 MPa | 0.4d | Cold worked, higher strength |
| A4 (316) | 50 | 500 MPa | 210 MPa | 0.6d | Marine / chemical |
| A4 (316) | 70 | 700 MPa | 450 MPa | 0.4d | Cold worked, marine |
| A4 (316) | 80 | 800 MPa | 600 MPa | 0.3d | High strength marine |
A2 = Type 304 (18/8). A4 = Type 316 (molybdenum-bearing for improved corrosion resistance). A4-80 is the highest strength class for stainless fasteners.
Specifies dimensional and geometrical tolerances for bolts, screws, studs, and nuts. Defines acceptable deviation ranges for all critical dimensions.
| Dimension | M3 – M6 | M8 – M12 | M14 – M20 | M22 – M36 |
|---|---|---|---|---|
| Thread Tolerance | 6g/6H | 6g/6H | 6g/6H | 6g/6H |
| Head Height | ±0.15 mm | ±0.20 mm | ±0.30 mm | ±0.40 mm |
| Width Across Flats | −0.18 mm | −0.22 mm | −0.27 mm | −0.33 mm |
| Length Tolerance | ±0.3 mm | ±0.4 mm | ±0.5 mm | ±0.6 mm |
| Straightness | 0.003 L | 0.003 L | 0.003 L | 0.003 L |
Product grade A (precision), B (standard), and C (loose) determine specific tolerance levels. L = nominal length.
Specifies the test method for determining the relationship between tightening torque and resulting clamp force. Critical for assembly engineering and quality control.
| Parameter | Symbol | Typical Range | Application |
|---|---|---|---|
| Torque Coefficient | K | 0.10 – 0.16 | General bolted joints |
| Thread Friction | μth | 0.08 – 0.20 | Plated / lubricated |
| Bearing Friction | μb | 0.08 – 0.18 | Under-head surface |
| Clamp Force | F | 55–75% Rp0.2 | Target preload range |
K = T / (F × d). Coated fasteners require re-testing as K-value changes with surface treatment.
Specifies requirements for non-electrolytically applied zinc flake coatings (e.g., Dacromet, Geomet) for steel fasteners. Widely used in automotive applications.
| Requirement | Value | Detail |
|---|---|---|
| Coating Thickness | 5 – 15 μm | Dependent on flake class |
| Salt Spray (NSS) | ≥480 h (min) | No red rust at rated hours |
| Hydrogen Embrittlement | No fracture | Test per ISO 15330 |
| Adhesion | Pass tape test | ISO 2409 cross-cut, Class 0 |
No hydrogen embrittlement risk — key advantage over electroplating for high-strength fasteners.
Covers mechanical testing procedures for externally and internally threaded fasteners. Defines test methods, equipment requirements, and acceptance criteria.
| Test Method | Scope | Applicable To | Key Equipment |
|---|---|---|---|
| Proof Load | No permanent set at rated load | Bolts, nuts | UTM, load cell |
| Wedge Tensile | Head soundness at angle | Bolts, screws | Wedge fixture + UTM |
| Hardness | Surface & core hardness | All fasteners | Rockwell/Vickers tester |
| Cone Proof Load | Ductility confirmation | Nuts | Cone mandrel |
F606 is the primary ASTM standard referenced for fastener mechanical testing in North American specifications like ASTM A325, A490, and F3125.
The most widely used corrosion testing standard globally. Defines salt spray chamber conditions, solution preparation, and test procedures for evaluating corrosion resistance.
| Parameter | Specification | NSS | AASS | CASS |
|---|---|---|---|---|
| NaCl Concentration | 5% ± 1% | 5% ± 1% | 5% ± 1% | |
| pH | 6.5 – 7.2 | 3.1 – 3.3 | 3.1 – 3.3 | |
| Temperature | 35°C ± 2° | 35°C ± 2° | 50°C ± 2° | |
| Collection Rate | 1–2 mL/h/80cm2 | 1–2 mL/h/80cm2 | 1–2 mL/h/80cm2 |
NSS = Neutral Salt Spray. AASS = Acetic Acid Salt Spray. CASS = Copper-Accelerated Acetic Acid Salt Spray (for decorative coatings).
Standard method for chemical composition analysis using optical emission spectrometry. Rapid material grade verification and trace element detection.
| Element | Detection Range | Typical in 10.9 Steel | Significance |
|---|---|---|---|
| C | 0.01 – 1.5% | 0.25 – 0.42% | Hardenability, strength |
| Mn | 0.01 – 2.0% | 0.60 – 0.90% | Deoxidation, hardenability |
| Cr | 0.01 – 5.0% | 0.90 – 1.20% | Corrosion, hardenability |
| Mo | 0.01 – 2.0% | 0.15 – 0.30% | Creep resistance |
| Ni | 0.01 – 5.0% | ≤0.30% | Toughness, hardenability |
OES provides analysis in seconds. Results are used to confirm material grade, verify heat traceability, and detect counterfeit or misrepresented materials.
Defines methods for measuring grain size in metallic materials. Grain size critically affects mechanical properties — finer grains generally produce higher strength and toughness.
| ASTM Grain Size | Grains / mm2 | Grain Diameter | Typical Application |
|---|---|---|---|
| G 5 | 250 – 500 | ∼60 μm | Low carbon steel |
| G 7 | 1000 – 2000 | ∼30 μm | Medium carbon Q&T |
| G 8 | 2000 – 4000 | ∼20 μm | Alloy steel, fine grain |
| G 10 | 8000 – 16000 | ∼10 μm | Case-hardened surface |
Grain size ≥5 is typically required for ISO 898-1 property classes 8.8 and above. Comparison method or planimetric method used.
Specifies dimensions, tolerances, and technical delivery conditions for hexagon socket head cap screws (Allen bolts). The most common precision fastener for machinery and tooling.
| Thread d | Head Dia. dk | Head Ht. k | Socket s | Thread Length b |
|---|---|---|---|---|
| M4 | 7.0 mm | 4.0 mm | 3.0 mm | 20 mm |
| M5 | 8.5 mm | 5.0 mm | 4.0 mm | 22 mm |
| M6 | 10.0 mm | 6.0 mm | 5.0 mm | 24 mm |
| M8 | 13.0 mm | 8.0 mm | 6.0 mm | 28 mm |
| M10 | 16.0 mm | 10.0 mm | 8.0 mm | 32 mm |
Now superseded by ISO 4762 which is technically equivalent. Both DIN 912 and ISO 4762 are widely referenced in engineering specifications.
Specifies fully threaded hexagon head bolts from M1.6 to M52. The most common general-purpose bolt standard in European and global engineering.
| Thread d | Across Flats s | Head Ht. k | Washer Face | ISO Equivalent |
|---|---|---|---|---|
| M6 | 10.0 mm | 4.0 mm | ● | ISO 4017 |
| M8 | 13.0 mm | 5.3 mm | ● | ISO 4017 |
| M10 | 17.0 mm | 6.4 mm | ● | ISO 4017 |
| M12 | 19.0 mm | 7.5 mm | ● | ISO 4017 |
| M16 | 24.0 mm | 10.0 mm | ● | ISO 4017 |
DIN 933 has been withdrawn and replaced by ISO 4017, but remains a commonly referenced legacy standard in engineering drawings.
Japanese standard for hexagon head bolts. Includes seismic-specific requirements for structural applications in earthquake-prone regions. Increasingly harmonized with ISO.
| JIS Property Class | ISO Equivalent | Tensile Rm | Hardness HRC | Special Requirement |
|---|---|---|---|---|
| 4T | 4.6 | 400 MPa | — | Low carbon |
| 6T | 6.8 | 600 MPa | — | Medium carbon |
| 8T | 8.8 | 830 MPa | 22 – 32 | CharPy verified at 0°C |
| 11T | 10.9 | 1070 MPa | 32 – 39 | Additional ductility req. |
JIS B 1180 mandates salt spray testing exceeding ISO 9227 by 20% for corrosion resistance validation. Key for Japanese automotive and infrastructure projects.
Need Technical Specifications?
Our engineering team can provide detailed specification sheets and compliance documentation for any standard referenced above. Contact us for material certifications, test reports, or technical consultation.