We at Riddhi Siddhi Impex manufacture and supply Inconel 718 shims from Mumbai, where we have slit Alloy 718 (UNS N07718) shim stock in-house since 2002. Our shims run from 0.03 mm to 5 mm thick to ASTM B670, AMS 5596, and AMS 5597. As an ISO 9001, 14001, and 45001-certified company, we maintain a ready stock of Inconel shims with a monthly supply capacity of 400 to 500 tonnes, with EN 10204 Type 3.1 or 3.2 certification available upon request.
Inconel 718 shims are thin precision spacers slit from nickel-chromium superalloy strip that gains its strength through ageing rather than cold work alone. During the solution treat and age cycle, niobium combines with nickel to precipitate the gamma double-prime phase, lifting tensile strength past 1240 MPa. High-performance Inconel shims in this condition hold their thickness and spring-back to about 650 °C, well beyond the reach of stainless shim stock. These Inconel 718 shims typically provide precise alignment and gap control in high-temperature aerospace engines, gas turbines, and exhaust systems.
As a reliable Inconel 718 shim supplier, we slit coils to ±0.1 mm on width, from 3 mm ribbons up to 2000 mm. Buyers order 718 shim stock solution annealed when the shim must be stamped or formed first, and precipitation hardened when it goes straight into service.
The table below covers the UNS N07718 shim stock we manufacture: thickness, width, slitting tolerance, surface finish, and edge condition.
| Parameter | Details |
|---|---|
| Standard | ASTM B670 / AMS 5596 / AMS 5597 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Surface Finish | BA (Bright Annealed), Matte, Skin Pass |
| Edge | Slit, Mill, Deburred, Round |
Alloy 718 shims owe their age-hardening response to niobium with tantalum at 4.75 to 5.50%, supported by titanium and aluminium. The AMS 5596 limits follow.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 50.0 to 55.0 |
| Chromium (Cr) | 17.0 to 21.0 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 to 5.50 |
| Molybdenum (Mo) | 2.80 to 3.30 |
| Titanium (Ti) | 0.65 to 1.15 |
| Aluminium (Al) | 0.20 to 0.80 |
| Cobalt (Co) | 1.0 max |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 0.35 max |
| Silicon (Si) | 0.35 max |
| Copper (Cu) | 0.30 max |
| Boron (B) | 0.006 max |
| Phosphorus (P) | 0.015 max |
| Sulphur (S) | 0.015 max |
Unlike work-hardening shim alloys, Inconel 718 reaches full strength through heat treatment. Solution annealed shim stock stays formable near 1034 MPa tensile, so it can be blanked and bent before ageing.
We stock all three conditions. The annealed row below shows AMS 5596 minima and the aged row shows AMS 5597 minima, while the spring temper row is indicative and certified against the mill test certificate per order.
| Condition | Tensile Strength | Yield Strength (0.2% Offset) | Hardness | Elongation (in 50mm) |
|---|---|---|---|---|
|
Solution Annealed
|
1034 MPa (150 ksi) min | 517 MPa (75 ksi) min | 100 HRB max | 30% min |
|
Precipitation Hardened (Aged)
|
1240 MPa min | 1035 MPa min | 36 to 47 HRC | Per print |
|
Cold Rolled Spring Temper
|
1240 to 1585 MPa | Per print | 40 to 47 HRC |
Purchase specifications that call for W.Nr 2.4668 or GH4169 shims match our UNS N07718 shim stock as shown below.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N07718 |
| Europe (EN) | NiCr19Fe19Nb5Mo3 |
| Germany (W.Nr) | 2.4668 |
| Japan (JIS) | NCF718 |
| China (GH) | GH4169 |
Precision shims meet heat, vibration, and fatigue in every gap they fill. These 4 industries specify Alloy 718 shim stock most often.
Turbine engines use Inconel 718 shims for blade tip clearance, heat shields, and exhaust sealing layers. Gap-adjustment shim packs in aerostructures rely on the aged temper, which keeps fatigue strength through repeated thermal cycling to about 650°C.
Gas turbine builders fit Nickel Alloy 718 shims for rotor alignment and heat exchanger spacing. The precipitation-hardened shim resists creep over long service intervals, so the alignment set at assembly stays put through years of combustion heat.
Valve shims, pump spacing shims, and instrumentation spacers in sour service depend on 718 shim stock. Its resistance to sulphide stress cracking makes it a standard pick for wellhead and downhole assemblies.
Flat springs, bellows, and precision machine spacers draw on the spring temper. A cold rolled IN718 shim delivers high-cycle fatigue strength where carbon spring steel would relax or corrode.
We dispatch Inconel 718 shims from Mumbai and Taloja in wooden cases or on pallets, as exporters and suppliers to buyers worldwide.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW Mumbai |
| Dispatch Points | Mumbai, Taloja |
| 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 |
Indicative pricing for Inconel 718 shims runs from Rs 3600 to Rs 7200 per kg for Indian buyers and USD 38 to USD 76 per kg for export. Thickness, temper, width, finish, quantity, and nickel market movement all shift the rate. Call or WhatsApp us with your size and temper for a firm quote.
Inconel 718 shims are used for turbine blade tip clearance, rotor alignment, valve and pump spacing, and flat springs across the aerospace, power, oil and gas, and general engineering sectors up to about 650 °C.
Inconel 718 shims are available from 0.03 mm to 5 mm thick and 3 mm to 2000 mm wide, custom slit to ±0.1 mm.
Inconel 718 shims are supplied solution annealed for forming, precipitation hardened above 1240 MPa tensile for finished service, and cold rolled to spring temper for flat spring work.
The main difference between Inconel 718 and Inconel 625 shims is the strength against corrosion duty. Aged 718 shims carry roughly twice the yield strength for load-bearing gaps, while 625 shims suit chemical exposure where corrosion resistance matters more than strength.
The indicative price of Inconel 718 shims is Rs 3600 to Rs 7200 per kg in India and USD 38 to USD 76 per kg for export, subject to gauge, temper, and market rates.
Inconel 718 shims are covered by ASTM B670 for flat products. The annealed row below is AMS 5597 minima, and the aged row is AMS 5596 minima, under UNS N07718.
You can source Inconel 718 shims from us at Riddhi Siddhi Impex, a Mumbai-based manufacturer and supplier since 2002. Send your requirement on call or WhatsApp for a quote within 24 hours.
