We are Riddhi Siddhi Impex, a Mumbai-based Stainless Steel 310S Shims manufacturer and supplier, established in 2002. We slit 310S shim stock to ASTM A240 / ASME SA-240 in thicknesses from 0.03 to 5 mm. Our ISO 9001, 14001, and 45001-certified company holds ready stock and a monthly supply capacity of 400-500 tonnes, ships worldwide with EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Stainless Steel 310S shims are thin, flat spacers slit from 310S, a low-carbon austenitic grade built around 25% chromium and 20% nickel. The carbon ceiling of 0.08% curbs carbide precipitation, so the metal keeps its structure through long spells at high temperature. AISI 310S resists oxidation and scaling in continuous service up to roughly 1050 °C. Fabricators fit use Stainless Steel shims wherever a precise gap must survive heat: between furnace plates, under burner mounts, and inside heat-exchanger stacks.
We slit every 310S shim in-house on our own lines rather than reselling fixed widths. Stock leaves the plant in annealed soft condition to ASTM A240, in any width from 3 mm to 2000 mm, with BA, 2B, Matte, or Scotch-Brite surfaces. A documented quality system tracks each coil from incoming inspection to dispatch, and mill test certificates follow on request.
We provide 310S shim stock to ASTM A240 / ASME SA-240 in annealed condition, with four surface finishes and edge options, precision-slit to your width from coil or supplied flat.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Condition | Annealed (Soft) |
| Surface Finish | BA (Bright Annealed), 2B, Matte, Scotch-Brite |
| Supply Forms | Cold rolled (CR) |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Chromium at 24 to 26% builds the oxide film that gives 310S its heat resistance, while 19 to 22% nickel holds the austenite stable across the working range. The full ASTM A240 composition for AISI 310S shims appears below.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 1.50 max |
| Chromium (Cr) | 24.0-26.0 |
| Nickel (Ni) | 19.0-22.0 |
Annealed 310S austenitic stainless steel shims pair a 515 MPa minimum tensile strength with 40% elongation, so the material forms and punches without cracking. Values for gauges under 0.5 mm are indicative rather than tested to the standard.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
515 MPa (75 ksi) |
|
Yield Strength (0.2% offset), minimum
|
205 MPa (30 ksi) |
|
Hardness (max)
|
217 HBW / 95 HRB |
|
Elongation in 50 mm, minimum
|
40% |
International buyers can cross-reference UNS S31008 shims against their regional standard using the table below. Our 310S shim stock matches every designation listed here, from 1.4845 shims in Europe to SUS 310S shims in Japan.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S31008 |
| Europe (EN) | X8CrNi25-21 |
| Germany (W.Nr) | 1.4845 |
| Japan (JIS) | SUS310S |
| China (GB) | 06Cr25Ni20 |
| Russia (GOST) | 10Х23Н18 |
5 industries use the 310S shim stock we slit. In each, buyers pick the grade for high-temperature oxidation resistance and dimensional stability rather than room-temperature strength.
Furnace builders use 310S shims around muffle joints, hearth plates, and burner mounts. The 25-20 stainless structure resists scaling near 1050 °C, so spacers hold their thickness through heating cycles that would warp lower-alloy steel.
Refinery and reformer assemblies use SS 310S shims where oxidising and carburising gases attack ordinary spacers. The grade resists sulphidation and keeps its strength at temperature, holding flange gaps aligned across long production runs.
Boiler and superheater assemblies rely on 310S shim stock for baffle spacing and tube-support alignment. High chromium limits oxide growth on hot surfaces, and the shims stay dimensionally stable under sustained thermal load.
Kiln hoods, calciner supports, and glass-furnace fittings run above 1000 °C for weeks together. Alloy 310S shims tolerate that duty, resisting oxidation and the abrasive dust of cement and glass lines.
Heat-exchanger builders set 310S shims as precision spacers and thin gasket layers between hot mating faces. A shim slit to ±0.1 mm seats without trimming, so technicians fix clearances accurately during assembly.
Export orders leave from Mumbai, and Taloja is packed in wooden cases or on pallets, ready for sea freight.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW Mumbai |
| Dispatch Points | Mumbai and Taloja warehouses |
| Standard Lead Time | 4 to 5 days |
| Urgent Dispatch | 2 to 3 days |
| Payment Terms | Advance, credit, LC |
| Certification | EN 10204 Type 3.1 / 3.2 on request |
The price of Stainless Steel 310S Shims in India is around ₹180 to ₹350 per kg. International buyers pay roughly $2.85 to $5.00 per kg. Nickel and chromium surcharges move the figure, along with thickness, width, finish, and quantity. As a stockist, we hold ready material, so call or WhatsApp us for today's price list.
We slit Stainless Steel 310S shim stock from 0.03 mm to 5 mm thick, in any width between 3 mm and 2000 mm. Gauges below 0.03 mm fall under our Stainless Steel 310S foil range.
310S shim stock offers strong oxidation and scaling resistance in continuous service up to approximately 1050 °C. That heat tolerance suits furnace, kiln, and heat-treatment spacing, where lower-alloy spacers would scale.
Yes. We precision-slit SS 310S shims to any width from 3 mm to 2000 mm, holding a width tolerance of ±0.1 mm, so each spacer arrives ready to fit.
We supply SS310S shims in BA (bright annealed), 2B, Matte, and Scotch-Brite finishes. Slit, mill, deburred, or round edges suit winding and gasket work.
Standard dispatch runs 4 to 5 working days from our Mumbai and Taloja warehouses. Urgent orders can leave in 2 to 3 days, subject to the slitting schedule.
You can source Stainless Steel 310S shims in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds ready stock for immediate dispatch, and as a stockist and exporter we serve buyers across India and overseas. Phone or WhatsApp us for a quote within 24 hours.
