Gear Coupling Size Chart — FGC, HGC, HRC & Tyre Sizes (2026)
One-stop gear coupling size chart for India — FGC 1–7, HGC, HRC 070–230, tyre F40–F140 and jaw L-series sizes, with torque, bore and misalignment ranges. Request full spec sheets from SMI.
This is a one-stop size reference for the gear couplings and flexible couplings most commonly specified in India. Use the size designations below to identify your coupling, then request the full dimensional spec sheet (bore, OD, length and exact torque per size) from SMI.
Size codes follow common industry conventions; exact per-size dimensions vary by manufacturer — always confirm against your drawing or existing coupling before ordering.
Flexible / Full Gear Coupling (FGC series)
SMI's full gear couplings run from FGC 1 (smallest) to FGC 7 (largest).
| Parameter | Range (FGC 1–7) |
|---|---|
| Size designations | FGC 1, 2, 3, 4, 5, 6, 7 |
| Torque range | 500 – 500,000 Nm (size dependent) |
| Bore sizes | 20 – 400 mm |
| Maximum speed | up to 5,000 RPM |
| Misalignment | Angular up to 1.5°, Parallel up to 3 mm |
| Temperature | −30 °C to +120 °C |
Half Gear Coupling (HGC series)
SMI's half gear couplings (one flexible gear hub + one rigid flange) are designated HGC 1 to HGC 6, sized to match the FGC torque steps.
HRC Coupling sizes
Standard taper-bush HRC couplings: HRC 070, 090, 110, 130, 150, 180, 230 — defined by bore range and torque.
Tyre Coupling sizes (F-series)
Tyre couplings: F40, F50, F60, F70, F80, F90, F100, F110, F120, F140, in pilot bore (A) or taper bush (TC).
Jaw / Star Coupling sizes (L-series)
Jaw (star) couplings: L-050, L-070, L-075, L-090, L-095, L-099, L-100, L-110, L-150, L-190, L-225, with elastomer spider.
How to use this chart
- Identify the family (gear, tyre, HRC, jaw) by your application and misalignment needs.
- Match required torque and shaft bore to the size step.
- For exact per-size dimensions and torque, request the spec sheet — or send your shaft size / a photo of the existing coupling.
Need help sizing? See our selection guide or contact SMI's engineers for a recommendation and quote.
Super Mech Industries — Odhav, Ahmedabad, Gujarat 382415, India. Phone: +91 63510 70577. Email: smigvs@gmail.com. ISO 9001:2015 certified.