SS 310 / 310S Machine ScrewUNS S31008 · ASME B18.6.3 · Manufacturer, trader & exporter, India
AISI 310S · UNS S31008
An SS 310 / 310S machine screw is a small-diameter screw for equipment assembly. Finished fastener specification not asserted; material/feedstock may be supplied to ASTM A276 / A479 (UNS S31008), where applicable; manufacturing route and finished fastener requirements are to the purchase specification or project drawing. Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads.
- UNS S31008
- ASME B18.6.3
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 310 / 310S Machine Screw?
- What it is
- A small-diameter screw for equipment assembly
- Finished spec
- Not asserted
- Material / feedstock
- ASTM A276 / A479 (UNS S31008), where applicable
- Dimensions
- ASME B18.6.3 · DIN 84 / 963 (legacy DIN)
- Grade
- SS 310 / 310S · UNS S31008
- Best at
- Furnaces, burners and heat treatment at high temperature
SS 310 / 310S Machine Screw Specification
| Product | SS 310 / 310S Machine Screw |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | ASTM A276 / A479 (UNS S31008), where applicable |
| Dimensional standard | ASME B18.6.3 · DIN 84 / 963 (legacy DIN) |
| Manufacturing route | Route dependent on product design and purchase specification |
| Project / purchase specification | Yes — finished fastener requirements are to the purchase specification or project drawing |
| Sizes | M10 – M64 · ½" – 4" (others on request) |
| Threads | UNC · UN-8 · metric coarse |
| Testing | PMI (as specified in the PO) · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 or 3.2 on request / as specified in the PO |
When to Choose a Machine Screw
Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads.
- Pan, flat and cheese heads
- Slotted or Phillips
- M2 – M10 typical
More on choosing: Machine screw guide.
SS 310 / 310S Machine Screw: Why 310S for machine screws
Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads. In SS 310 / 310S, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Stainless fasteners resist atmospheric and process corrosion. SS 310 / 310S is picked for furnaces, burners and heat treatment at high temperature. |
|---|---|
| Typical service | Furnace parts — Muffles, retorts, radiant tubes and conveyor belts. |
| Bolting | A193 B8 or project-specified bolting |
SS 310 / 310S Machine Screw Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
| Iron | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S31008.
SS 310 / 310S Machine Screw Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S31008 — Annealed plate & sheet.
Full chemistry, properties and equivalents are on the SS 310 / 310S grade page.
Standards on this page
Other SS 310 / 310S fasteners
SS 310 / 310S Machine Screw — questions buyers ask
What sizes are machine screws?
Usually small diameters, M2 to M10 or #2 to 3/8".
What nut is used with SS 310 / 310S machine screws?
Usually a nut in the same alloy — it may be machined from ASTM A276 / A479 bar, where applicable; finished requirements are to the purchase specification or project drawing.
Which standard covers SS 310 / 310S machine screws?
Finished fastener specification: Not asserted. Material / feedstock: ASTM A276 / A479 (UNS S31008), where applicable. Dimensions: ASME B18.6.3 · DIN 84 / 963 (legacy DIN). State the finished specification, material and dimensions on your purchase order or project drawing.
What decides the price of a SS 310 / 310S machine screw?
The alloy price, the size and dimensions, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 or 3.2 certificates available on request / as specified in the PO; dimensional reports as required. PMI can be arranged depending on product and requirements, as specified in the PO.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026