We are Riddhi Siddhi Impex, a Mumbai-based manufacturer and supplier of Stainless Steel 304L Shims, established in 2002. We slit low-carbon UNS S30403 shim stock to ASTM A240 / ASME SA-240, from 0.03 mm to 5 mm thick. As an ISO 9001, 14001, and 45001-certified company with a supply capacity of 400-500 tons monthly, we issue EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Stainless Steel 304L Shims are precision spacers slit from the low carbon 18/8 austenitic grade. Carbon is limited to 0.030% maximum, against 0.08% in standard 304, so a welded shim keeps its grain boundaries clear of chromium carbide and resists intergranular attack across the 425 to 850 °C sensitisation range. Chromium at 17.5 to 19.5% supplies the passive film, and nickel keeps the structure ductile. 304 stainless steel shims are typically used for precise alignment and spacing in welded assemblies, chemical plants, and marine environments.
As a reliable stainless steel 304 Shim supplier, none of the stainless steel shims we offer come from a reseller's shelf. Our own lines slit annealed ASTM A240 stock to any width from 3 mm to 2000 mm, with deburred or round edge options for sealing faces, and our inspectors log each coil from goods in to final packing.
We provide ASTM A240 304L Shims in the annealed soft condition only, custom-slit from ready stock, in the finishes and edge conditions set out below.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240, ASTM A480 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Condition | Annealed (Soft) |
| Supply Forms | Cold rolled |
| Surface Finish | BA (Bright Annealed), 2B, Matte, Matte PVC, Scotch-Brite |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
The carbon ceiling separates SS 304L Shims from the standard grade. Held to 0.030% maximum, carbon cannot pull the 17.5 to 19.5% chromium out of solution, so corrosion resistance survives welding.
| Element | Composition (% by weight) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 0.75 max |
| Chromium (Cr) | 17.5 to 19.5 |
| Nickel (Ni) | 8.0 to 12.0 |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
Annealed 304L Stainless Steel Shims deliver a 485 MPa tensile floor and stretch 40% minimum, so they blank cleanly and fold around uneven seats without cracking. Soft is the only condition we offer, as 304L is not a temper-rolled grade. For gauges under 0.38 mm, treat the tabulated figures as indicative, since ASTM A240 relaxes elongation requirements at foil thicknesses.
| Property | Value (Annealed) |
|---|---|
|
Tensile Strength, minimum
|
485 MPa (70 ksi) |
|
Yield Strength (0.2% offset), minimum
|
170 MPa (25 ksi) |
|
Elongation in 50 mm, minimum
|
40% |
|
Hardness, maximum
|
201 HBW / 92 HRB |
Engineers ordering 1.4307 shims, SUS304L shims, or UNS S30403 shims against a regional code can confirm the matching designation in this table.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S30403 |
| Europe (EN) | X2CrNi18-9 |
| Germany (W.Nr) | 1.4307 |
| Japan (JIS) | SUS304L |
| China (GB) | 022Cr19Ni10 |
| Russia (GOST) | 03Х18Н11 |
These 4 industries utilise the 304L SS shims we slit, picking the low-carbon grade wherever a spacer gets welded, washed down, or fitted near corrosion-sensitive equipment.
Engine and airframe fitters level mounts, pack seat tracks, and build up mounting faces with 304L shim stock. Shims slit to ±0.1 mm seat first time, and tack-welded packs hold their corrosion resistance where a standard 304 spacer would sensitise.
Dairy, brewery, and pharma engineers align filler heads, mixer mounts, and conveyor rails on Type 304L shims. Daily caustic cleaning and steam sterilisation leave no mark on the passive layer, so lines clear hygiene audits year after year.
Gasket cutters blank Stainless Steel 304L Shims into sealing rings, hose clamp liners, and spring seats. The annealed sheet folds around flange irregularities without splitting, and welded gasket assemblies stay free of grain-boundary attack in service.
Instrument makers stamp camera parts, watch band links, and metal tower packing from 304L Stainless Steel Shims. Tight thickness control supports fine blanking, and the annealed austenitic structure keeps magnetic permeability low beside sensor assemblies.
Consignments of packed SS 304L shims are transported from Taloja and Mumbai to various destinations throughout India or the world within a matter of days.
| 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 mill test certificates on request |
Stainless Steel 304L Shims price in India is roughly ₹200 to ₹359 per kg, and export buyers generally pay about $3.5 to $4.2 per kg depending on thickness, finish, and quantity. The low-carbon grade carries a modest premium over standard 304 shims. Treat the band as indicative, because nickel rates, gauge, slit width, finish, and quantity all move it. Call or WhatsApp our team for an exact quote.
Stainless Steel 304L Shims come in thicknesses from 0.03 mm to 5 mm, with slit widths of 3 mm to 2000 mm held within ±0.1 mm.
Stainless Steel 304L Shims differ from SS 304 shims in carbon content, 0.030% max against 0.08% max. The lower carbon content helps prevent sensitisation and intergranular corrosion after welding, while standard 304 offers higher strength minimums plus temper-rolled options.
Stainless Steel 304L Shims are essentially non-magnetic in the annealed condition we supply. Light cold work at slit edges can raise a faint magnetic response, far weaker than in hard-tempered 304.
Yes, Stainless Steel 304L Shims weld by TIG, spot, and seam methods with no post-weld anneal. The 0.030% carbon cap keeps chromium carbide out of the heat-affected zone.
Stainless Steel 304L Shims price in India is roughly ₹200 to ₹359 per kg, and export buyers generally pay about $3.5 to $4.2 per kg. Send gauge, width, finish, and quantity for a firm rate.
You can source Stainless Steel 304L Shims in India from us at Riddhi Siddhi Impex. Ready UNS S30403 stock is in our Mumbai and Taloja warehouses, with slitting and dispatch inside 4 to 5 days, or 2 to 3 days on urgent orders. Call or WhatsApp us; quotes will be provided within 24 hours.
