We are Riddhi Siddhi Impex, a Mumbai-based Monel 400 shims manufacturer and supplier, established in 2002. We slit nickel-copper Alloy 400 shims to ASTM B127 / ASME SB-127 in thicknesses from 0.03 mm to 5 mm. Our ISO 9001, 14001, and 45001-certified firm carries ready stock, a monthly supply capacity of 400 to 500 tonnes, and ships worldwide with EN 10204 Type 3.1 / 3.2 certificates on request.
Monel 400 shims are thin, flat spacers slit from a nickel-copper alloy holding 63.0% minimum nickel and 28.0 to 34.0% copper. This solid-solution grade is not hardenable by heat treatment, so it gains strength only through cold work. The high nickel and copper content resists hydrofluoric acid, seawater, and reducing conditions that attack stainless steel. Fitters place these shims wherever a gap must be set accurately, between flanges, under pump housings, and inside valve assemblies. These Monel Shims are specified in power generation and marine applications.
As a Monel 400 Shims supplier, we process every Nickel-Copper Alloy 400 shim in-house on our own slitting lines. Material leaves in soft annealed condition to ASTM B127, in any width from 3 mm to 2000 mm. Buyers can specify BA, 2B, or Matte surfaces with slit, deburred, or round edges. A documented quality system governs each stage, from source coil inspection through final dispatch.
We provide ASTM B127 Monel 400 shim stock in soft annealed condition, with a choice of surface finishes and three edge options.
| Parameter | Details |
|---|---|
| Standard | ASTM B127 / ASME SB-127 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Condition | Soft / Annealed |
| Surface Finish | BA (Bright Annealed), 2B, Matte |
| Supply Form | Cold Rolled |
| Edge | Slit edge, Deburred edge, Round edge |
Nickel and copper define this grade. UNS N04400 shims carry at least 63.0% nickel with 28.0 to 34.0% copper, and this pairing gives the alloy its resistance to reducing acids and seawater. The full composition to ASTM B127 appears below.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 28.0 to 34.0 |
| Iron (Fe) | 2.50 max |
| Manganese (Mn) | 2.00 max |
| Carbon (C) | 0.30 max |
| Silicon (Si) | 0.50 max |
| Sulphur (S) | 0.024 max |
Soft annealed Alloy 400 shims pair a 480 MPa minimum tensile strength with 35% elongation, so they form, bend, and punch without cracking. The yield minimum applies to the qualifying gauge, so figures for shims below 0.51 mm are indicative.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
480 MPa (70 ksi) |
|
Yield Strength (0.2% offset), minimum
|
195 MPa (28 ksi) |
|
Elongation in 50 mm, minimum
|
35% |
International buyers can cross-reference UNS N04400 shims against their regional standard below. The 2.4360 shims we slit match every designation listed.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N04400 |
| Europe (EN) | NiCu30Fe |
| Germany (W.Nr) | 2.4360 |
| Japan (JIS) | NW 4400 |
| United Kingdom (BS) | NA 13 |
These 4 industries consistently specify the Alloy 400 shims we slit. In each case, buyers select the grade for corrosion resistance in reducing and seawater conditions rather than for strength.
Marine fabricators use Monel 400 shims around pump bodies, valve seats, and seawater piping supports. UNS N04400 resists flowing seawater, pitting, and chloride stress corrosion cracking, so a shim holds its thickness in saline service where a stainless spacer would corrode and lose the setting.
Chemical plants specify Alloy 400 shims at flanges and heat exchanger joints handling hydrofluoric and sulphuric acid. The nickel-copper matrix resists reducing acids that corrode stainless steel, so the shim keeps the clearance stable through long runs and cuts unplanned shutdowns for realignment.
Oil and gas operators use Monel 400 shims on wellhead equipment, valve trim, and instrument mounts exposed to sour, chloride-bearing fluids. The grade withstands hydrogen sulphide and brine, and a shim slit to ±0.1 mm sets the exact gap between mating parts without on-site trimming.
Power stations use Monel 400 shims in feedwater heaters, condenser assemblies, and turbine auxiliaries cooled by seawater. Resistance to both saline coolant and reducing acids lets one shim material serve duties that would otherwise require two, which simplifies spares and keeps alignment accurate.
Export orders leave Mumbai and Taloja, packed in wooden cases or on pallets, ready for sea.
| 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 |
Monel 400 Shims price range in India is around ₹3,500 to ₹4,000 per kg. In the USA, it is generally $45 to $50 per kg. The figure tracks global nickel and copper rates, and thickness, width, quantity, and finish all move it. Volume discounts apply to bulk orders, so call or WhatsApp us for today's rate.
We slit Monel 400 shim stock from 0.03 mm to 5 mm thick and to any width between 3 mm and 2000 mm. Anything below 0.03 mm falls under our Monel 400 foils range instead.
Monel 400 is a solid-solution alloy that strengthens only through cold work, not by heat treatment. We supply the shims in soft annealed condition, and they may work-harden if put under repeated mechanical stress during use.
Yes, we custom-slit Monel 400 shims to any width between 3 mm and 2000 mm on our own lines, holding ±0.1 mm.
Some of the surface finishes we offer are BA, 2B, and Matte.
You can source Monel 400 shims in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds N04400 shim inventory on the shelf, ready for immediate dispatch. As a manufacturer, stockist, and exporter, we serve buyers across India and export overseas. Phone or WhatsApp us and we will provide a quote within 24 hours.
