We are Riddhi Siddhi Impex, a Mumbai-based manufacturer and supplier of Stainless Steel 409 Shims, established in 2002. Our slitting lines turn titanium-stabilised ferritic coil into shim stock to ASTM A240 / ASME SA-240, from 0.03 mm to 5 mm thick. Our ISO 9001, 14001, and 45001-certified company holds ready stock, with 400-500 tons of monthly supply capacity and EN 10204 Type 3.1 / 3.2 certificates on request.
409 Stainless Steel Shims are precision-slit ferritic spacers carrying 10.5 to 11.7% chromium with a titanium addition that bind carbon and nitrogen into stable carbonitrides. Welded edges therefore keep their corrosion resistance without post-weld annealing. Because the grade holds almost no nickel, it is the least expensive stainless shim material, and it stays magnetic in every condition.
Fitters slide these Stainless Steel Shims into exhaust assemblies, flange joints, and machine mounts where heat matters more than chloride exposure.
As a reliable Stainless Steel 409 Shim supplier, we slit every 409 shim in-house from source coil, supply the annealed soft condition per ASTM A240, and hold any width between 3 mm and 2000 mm to ±0.1 mm. Deburred or round edges suit gasket faces straight off the line.
We provide ASTM A240 Type 409 shim stock in the annealed soft condition, slit to your exact width from ready inventory, with the finish and edge options below.
| 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) |
| Supply Forms | Hot Rolled, Cold rolled |
| Surface Finish | BA (Bright Annealed), 2B, Matte, Scotch-Brite |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Titanium defines SS 409 Shims. Added at six times the combined carbon and nitrogen, it forms carbonitrides that leave chromium free to protect the surface. Current ASTM A240 limits for S40910 appear below.
| Element | Composition (% by weight) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulphur (S) | 0.020 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 10.50 to 11.70 |
| Nickel (Ni) | 0.50 max |
| Titanium (Ti) | 6x(C+N) min to 0.50 max |
| Niobium (Nb) | 0.17 max |
| Nitrogen (N) | 0.030 max |
| Iron (Fe) | Balance |
Formability is the prominent point of this grade. Annealed SA-240 Type 409 shim stock reaches 20% minimum elongation, so it punches and bends cleanly. Shims ship soft only; 409 carries no hardness temper ladder. Below the standard's thin-gauge testing threshold, treat the figures as indicative.
| Property | Value (Annealed) |
|---|---|
|
Tensile Strength, minimum
|
380 MPa (55 ksi) |
|
Yield Strength (0.2% offset), minimum
|
170 MPa (25 ksi) |
|
Elongation in 50 mm, minimum
|
20% |
|
Hardness, maximum
|
88 HRB |
Buyers ordering UNS S40900 shims, EN 1.4512 shims, or AISI 409 material under a regional code can match designations in this table.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S40900 / S40910 |
| Europe (EN) | X2CrTi12 |
| Germany (W.Nr) | 1.4512 |
| Japan (JIS) | SUH409 / SUS409L |
| China (GB) | 022Cr11Ti |
| United Kingdom (BS) | 409S |
| Italy (UNI) | X2CrTi12 / 1.4512 |
| France (AFNOR) | Z3CT12 |
| Russia / CIS (GOST) | 12X17 |
These 4 industries account for most of the 409 stainless shims leaving our slitting lines. Each picks the grade for heat and oxidation resistance delivered at a fraction of austenitic cost.
Exhaust builders set catalytic converter housings, muffler baffles, and flexible-joint clearances with SS 409 shim stock. The grade handles continuous exhaust-gas temperatures around 675 °C, with intermittent excursions towards 815 °C, and welded tabs keep their ductility due to titanium stabilisation.
Thermal equipment makers use Grade 409 shims to level tube supports, adjust baffle gaps, and pack burner mounts. Ferritic steel expands roughly a third less than austenitic grades on heating, so shimmed joints hold their setting through repeated thermal cycling.
Gasket cutters blank 409 ferritic stainless steel shims into exhaust-manifold and engine sealing layers. Thin annealed stock conforms to flange faces under bolt load while resisting hot combustion gas, and its 20% elongation lets embossed sealing beads form without cracking.
Machine shops keep 409 SS shims for aligning pump bases, adjusting bearing preloads, and setting die clearances in dry or mildly corrosive plant. Thicknesses starting at 0.03 mm allow height correction in very fine steps at carbon-steel-like cost.
Shim orders leave from our Mumbai and Taloja warehouses within days, packed for domestic transport or export 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 |
Stainless Steel 409 shims price in India is around ₹140 to ₹210 per kg, roughly $1.5 to $2.2 per kg for export buyers. The range is indicative; ferrochrome rates, thickness, width, finish, and order volume all move it. Call or WhatsApp our team for today's figure.
SS 409 shims are available from 0.03 mm to 5 mm thick, in any width between 3 mm and 2000 mm. We hold width to ±0.1 mm.
Stainless Steel 409 shim stock is covered by ASTM A240 / ASME SA-240, the flat-product specification for chromium stainless steels, with general requirements per ASTM A480.
Yes, SS 409 shims can be custom-slit to any width from 3 mm to 2000 mm at ±0.1 mm. Non-standard widths ship in the same 4 to 5 day lead time.
SS 409 shims compare with SS 304 shims as a ferritic, magnetic, budget option against an austenitic all-rounder. Grade 409 gives up chloride resistance yet matches 304 for dry heat spacing at a much lower price.
The price of SS 409 shims is near ₹140 to ₹210 per kg in India, about $1.5 to $2.2 per kg for export. Send your thickness, width, and quantity for a firm quotation.
You can source 409 SS shims in India from us at Riddhi Siddhi Impex. Our Mumbai and Taloja warehouses hold ready ferritic shim stock, and quotes will be provided within 24 hours.
