At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium Nitronic 50 (XM-19) (UNS S20910) Socket Head Cap Screw built for demanding service. Nitrogen-strengthened austenitic stainless with roughly twice the yield strength of 316 and excellent corrosion resistance. This technical datasheet covers the precise dimensional tolerances per ASME B18.3 and the material requirements dictated by ASTM A193 Gr B8S and ASTM A276 / A479.
A Nitronic 50 (XM-19) Socket Screw uses an internal hexagonal drive and is suitable for assemblies where a compact socket-head design is preferred. The tables below provide the principal dimensions, equivalent material grades, chemical composition and mechanical properties covered by the technical data for this product.
Our socket head cap screws are manufactured in standard and custom configurations, ensuring a precise fit for demanding structural, piping, and chemical-process applications.
| Product Name | Nitronic 50 (XM-19) Socket Head Cap Screw | Material Category | Stainless Steel |
| Material Grade | Nitronic 50 (XM-19) (UNS S20910) | Fastener Spec | ASTM A193 Gr B8S |
| Dimension Spec | ASME B18.3 | Material Spec | ASTM A276 / A479 |
| Thread Standard | ASME B1.1 (UNC, UNF, 8UN) | Thread Tolerance | Class 2A / 3A |
The ASME B18.3 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. ASME B18.3 governs socket head cap screws driven by an internal hex (Allen) key.
| Nominal Size | Head Diameter (Max, in) | Head Height (Max, in) | Hex Socket Size (in) | Thread |
|---|---|---|---|---|
| #10 (0.190″) | 0.312 | 0.190 | 5/32 | 10-24 UNC |
| 1/4″ | 0.375 | 0.250 | 3/16 | 1/4-20 UNC |
| 5/16″ | 0.469 | 0.312 | 1/4 | 5/16-18 UNC |
| 3/8″ | 0.562 | 0.375 | 5/16 | 3/8-16 UNC |
| 1/2″ | 0.750 | 0.500 | 3/8 | 1/2-13 UNC |
| 5/8″ | 0.938 | 0.625 | 1/2 | 5/8-11 UNC |
| 3/4″ | 1.125 | 0.750 | 5/8 | 3/4-10 UNC |
| 1″ | 1.500 | 1.000 | 3/4 | 1-8 UNC |
The socket head design provides an internal hexagonal drive for assembly with an appropriate Allen or hex key. Buyers should confirm the required nominal diameter, thread series, length and socket size against the purchase drawing or applicable standard before ordering.
The UNS S20910 Socket Head Cap Screw is manufactured from Nitronic 50 (XM-19), 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 |
|---|---|---|---|---|
| S20910 | 1.3964 | X2CrNiMnMoNNb21-16-5-3 | – | – |
This section details the chemical composition limits and minimum mechanical properties governing Nitronic 50 (XM-19) (UNS S20910) fasteners, as dictated by ASTM A193 Gr B8S (chemistry & mechanicals) and the raw bar/rod standard ASTM A276 / A479.
| Element | Composition, % |
|---|---|
| Chromium | 20.5–23.5 |
| Nickel | 11.5–13.5 |
| Manganese | 4.0–6.0 |
| Molybdenum | 1.5–3.0 |
| Nitrogen | 0.20–0.40 |
| Niobium | 0.10–0.30 |
| Vanadium | 0.10–0.30 |
| Iron | Balance |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Annealed bar | 100 000 (690) | 55 000 (380) | 35 | – |
| High-strength / cold-worked | 135 000 (930) | 105 000 (725) | 20 | – |
Our Nitronic 50 (XM-19) socket head cap screws 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 Socket Head Cap Screws 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 B18.3 for dimensional requirements and ASTM A193 Gr B8S 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 Nitronic 50 (XM-19) Socket Head Cap Screw is an internally hex-driven cap screw manufactured from Nitronic 50 (XM-19) (UNS S20910). The product combines the ASME B18.3 dimensional geometry with the ASTM A193 Gr B8S material and fastener requirements.
The dimensional information in this datasheet is based on ASME B18.3, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the Nitronic 50 (XM-19) product range.
Nitronic 50 (XM-19) is identified as UNS S20910. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.3964, EN X2CrNiMnMoNNb21-16-5-3, British Standard –, –.
Nitronic 50 (XM-19) 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 Nitronic 50 (XM-19) Socket Head Cap Screw 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: Nitronic 50 (XM-19) / UNS S20910, nominal size, ASME B18.3 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
