At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium SS 304 (UNS S30400) Hex Bolt built for demanding service. The most widely used austenitic 18-8 stainless steel, offering good corrosion resistance and excellent formability. This technical datasheet covers the precise dimensional tolerances per ASME B18.2.1 and the material requirements dictated by ASTM A193 Gr B8 Cl.1 and ASTM A276 / A479.
A SS 304 Hex Bolt uses a hexagonal head for wrench or socket tightening and is one of the most widely specified fastener forms in industrial assembly. The tables below provide the principal dimensions, equivalent material grades, chemical composition and mechanical properties covered by the technical data for this product.
Our hex bolts are manufactured in standard and custom configurations, ensuring a precise fit for demanding structural, piping, and chemical-process applications.
| Product Name | SS 304 Hex Bolt | Material Category | Stainless Steel |
| Material Grade | SS 304 (UNS S30400) | Fastener Spec | ASTM A193 Gr B8 Cl.1 |
| Dimension Spec | ASME B18.2.1 | Material Spec | ASTM A276 / A479 |
| Thread Standard | ASME B1.1 (UNC, UNF, 8UN) | Thread Tolerance | Class 2A / 3A |
The ASME B18.2.1 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads.
| Nominal Size (in) | Body Diameter (Max – Min) | Width Across Flats (Max – Min) | Width Across Corners (Max – Min) | Head Height (Max – Min) |
|---|---|---|---|---|
| 1/4″ | 0.260 – 0.237 | 0.438 – 0.425 | 0.505 – 0.484 | 0.163 – 0.150 |
| 5/16″ | 0.324 – 0.298 | 0.500 – 0.484 | 0.577 – 0.552 | 0.211 – 0.195 |
| 3/8″ | 0.388 – 0.360 | 0.562 – 0.544 | 0.650 – 0.620 | 0.243 – 0.226 |
| 1/2″ | 0.515 – 0.482 | 0.750 – 0.725 | 0.866 – 0.826 | 0.323 – 0.302 |
| 5/8″ | 0.642 – 0.605 | 0.938 – 0.906 | 1.083 – 1.033 | 0.403 – 0.378 |
| 3/4″ | 0.768 – 0.729 | 1.125 – 1.088 | 1.299 – 1.240 | 0.483 – 0.455 |
| 1″ | 1.022 – 0.976 | 1.500 – 1.450 | 1.732 – 1.653 | 0.627 – 0.591 |
The hex head permits assembly with a standard wrench or socket. Buyers should confirm the required nominal diameter, thread series, length and thread class against the purchase drawing or applicable standard before ordering.
The UNS S30400 Hex Bolt is manufactured from SS 304, a stainless steel. The equivalent designations below assist with cross-referencing this material against European, British and other national standards.
| US / UNS | Werkstoff Nr. (DIN) | European (EN) | British Standard (BS) | Other / AFNOR |
|---|---|---|---|---|
| S30400 | 1.4301 | X5CrNi18-10 | 304 S31 | Z7 CN 18-09 (AFNOR) |
This section details the chemical composition limits and minimum mechanical properties governing SS 304 (UNS S30400) fasteners, as dictated by ASTM A193 Gr B8 Cl.1 (chemistry & mechanicals) and the raw bar/rod standard ASTM A276 / A479.
| Element | Composition, % |
|---|---|
| Chromium | 18.0–20.0 |
| Nickel | 8.0–10.5 |
| Manganese, max | 2.0 |
| Carbon, max | 0.08 |
| Silicon, max | 0.75 |
| Phosphorus, max | 0.045 |
| Sulfur, max | 0.030 |
| Iron | Balance |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Annealed bar (A276/A479) | 75 000 (515) | 30 000 (205) | 40 | 201 HB max |
| Cold-worked (F593 CW, ≤5/8 in.) | 100 000 (690) | 65 000 (450) | 20 | – |
Our SS 304 hex bolts are specified across the following industries and service conditions, drawing on the material’s core strengths:
For applications exposed to highly aggressive chemicals or chloride-rich environments, the exact operating conditions should be reviewed against the certified data for this grade rather than general stainless steel assumptions.
Every batch of Hex Bolts produced undergoes rigorous internal and third-party testing to ensure zero-defect delivery. We supply complete traceability with our global shipments.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
This datasheet references ASME B18.2.1 for dimensional requirements and ASTM A193 Gr B8 Cl.1 for material and fastener requirements. The applicable standard edition and purchase requirements should be confirmed for every project.
For ASME standards information, see the ASME standards catalogue. For ASTM International material and fastener specifications, see the ASTM International standards catalogue. These external references are provided for standards identification; the purchaser should verify the current edition applicable to the order.
A SS 304 Hex Bolt is an externally hex-driven bolt with a fully or partially threaded shank manufactured from SS 304 (UNS S30400). The product combines the ASME B18.2.1 dimensional geometry with the ASTM A193 Gr B8 Cl.1 material and fastener requirements.
The dimensional information in this datasheet is based on ASME B18.2.1, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the SS 304 product range.
SS 304 is identified as UNS S30400. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.4301, EN X5CrNi18-10, British Standard 304 S31, Z7 CN 18-09 (AFNOR).
SS 304 is a stainless steel known for good general corrosion resistance and wide industrial availability. For applications exposed to highly aggressive chemicals or chloride-rich environments, the exact operating conditions should be reviewed against the certified data for this grade rather than general stainless steel assumptions.
The product information supports standard and custom configurations. For a quotation, provide the required material grade, nominal size, dimensional requirement, quantity, standard and any inspection or certificate requirements.
Need a SS 304 Hex Bolt for an industrial project? Send the required size, quantity, standard and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: SS 304 / UNS S30400, nominal size, ASME B18.2.1 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
