Does SMI make a Lovejoy coupling equivalent?

Yes. SMI's Star Coupling is a jaw coupling with an elastomer spider that follows the standard L-050–L-225 sizing — an independently manufactured compatible alternative, not a genuine Lovejoy part. Confirm dimensions before ordering.

What is the spider in a jaw coupling?

The spider is the flexible elastomer element between the two jaw hubs that absorbs shock and misalignment. SMI offers replacement spiders in standard sizes and hardness grades.

How do I match an L-type jaw coupling size?

Use the L-code (e.g., L-095) or measure hub outer diameter, length and bore. SMI engineers can identify the correct size and spider from your dimensions or a photo.

Lovejoy / Jaw Coupling Equivalent in India (2026)

Need a Lovejoy (L-type / jaw) coupling equivalent in India? SMI makes compatible star/jaw couplings (L-050–L-225) with ISO 9001:2015 + ZED certification. Cross-reference and fit guidance.

Lovejoy L-type jaw couplings (with an elastomer "spider") are an industry standard for pumps, compressors and general drives. For replacements and new builds, SMI offers a locally manufactured, certified alternative.

Company details are compiled from public records and IndiaMART/TradeIndia listings (2026); verify certifications directly. Brand names are used for compatibility reference only — SMI couplings are independently manufactured alternatives, not genuine OEM parts.

Quick Answer

SMI's Star Coupling (jaw coupling with elastomer spider) is a compatible alternative to standard L-type jaw couplings, following the common L-050 to L-225 sizing, manufactured in Ahmedabad with ISO 9001:2015 + ZED certification.

Size cross-reference (standard L-series)

Standard Size	Typical use
L-050 / L-070 / L-075	Small motors, pumps
L-090 / L-095 / L-099 / L-100	General industrial drives
L-110 / L-150 / L-190 / L-225	Larger pumps, compressors

Important: confirm hub OD, length, bore and spider type against your existing coupling before ordering — dimensions and spider hardness vary between makers.

Why source locally

India pricing + faster regional supply.
Custom bore to your shaft; choice of spider hardness.
Verifiable ISO 9001:2015 + ZED certification.

How a jaw coupling actually transmits torque

A jaw coupling has three parts: two metal hubs with protruding jaws, and an elastomer "spider" that sits between them. The jaws of each hub interleave, and the spider's lobes fill the gaps. Torque passes from one hub's jaws, through the compressed spider lobes, into the other hub's jaws. Nothing metal touches metal in normal operation.

That construction gives the jaw coupling its two defining characteristics. It is fail-safe in one direction — if the spider shreds completely, the jaws will still engage metal-to-metal and the drive keeps turning, noisily, rather than stopping dead. And it is torsionally soft, so it damps vibration and cushions starts, which is why it is the default on pump and compressor drives.

Choosing the spider: the decision that matters most

Two couplings with identical hubs can behave completely differently depending on the spider. When you order a replacement, specify the element as deliberately as the size.

Spider type	Character	Suits
Softer rubber (lower shore hardness)	Most damping, lowest torque capacity	Vibration-sensitive drives, light pumps, where cushioning matters more than capacity
Standard rubber / NBR	Balanced; the usual default	General industrial pumps, fans, compressors
Polyurethane (harder)	Higher torque capacity, less damping, better oil resistance	Higher-torque drives, environments with oil or chemical exposure

Three points people get wrong:

A harder spider is not simply "better". It raises torque capacity but transmits more shock and vibration to the bearings on both sides.
Temperature limits the elastomer, not the hub. If the coupling sits next to a hot process or an oversized motor, tell us the ambient — a standard rubber element near its temperature limit hardens and cracks within months.
Oil and solvents attack rubber. If the coupling lives under a leaking seal, a polyurethane element will last considerably longer than standard rubber.

How to identify the coupling you already have

Most enquiries arrive as "I need a Lovejoy L-095". Often the existing coupling is not actually that size, so measure before you order. Four figures identify almost any jaw coupling:

Hub outside diameter — across the widest part of the metal hub.
Hub length through the bore, and the overall assembled length.
Bore diameter and keyway — width and depth of the keyway, measured, not assumed.
Number of jaws and the spider's outside diameter.

Send those four with a photograph of the hub face and any casting marks. We can identify the size and confirm the equivalent without you needing to strip the drive twice.

Sizing for a new drive

Start with the torque at the coupling:

T (Nm) = 9,550 × P (kW) ÷ n (RPM)

A 7.5 kW motor at 1,440 RPM produces about 50 Nm. Then apply a service factor for the driven machine — around 1.0 to 1.25 for smooth centrifugal pumps and fans, 1.5 or more for reciprocating compressors, mixers and anything that starts under load. Select the coupling size on the service-factored figure, and check that both shaft diameters fit within the size's bore range. If a shaft is at the very top of a size's bore range, the remaining hub wall is thin — move up a size rather than machining to the limit.

Misalignment: what it will and will not forgive

Jaw couplings tolerate modest angular and parallel misalignment plus some axial float, and they are more forgiving than a chain or gear coupling of the same size. That tolerance is for residual error after alignment, not a substitute for it. Misalignment is absorbed by the spider deforming on every revolution, which generates heat inside the elastomer and is the most common reason a spider that should last years fails in months.

If a drive keeps eating spiders, the coupling is reporting a problem rather than causing one — check alignment, check for a soft foot under the motor, and check pipe strain pulling the pump out of line.

Failure modes and what they tell you

Spider lobes shredded or extruded outward — torque overload, or the wrong element hardness for the duty.
Spider hard, glazed and cracked — heat. Either ambient temperature, or heat generated by misalignment.
Spider swollen and soft — chemical or oil attack. Switch element material and fix the leak.
Uneven wear on one side of each lobe — angular misalignment.
Jaws worn or peened — the coupling has been running metal-to-metal with a failed spider. Replace both hubs; worn jaws will destroy a new spider quickly.
Hub loose on the shaft, keyway rolled over — the fit or the key was wrong, not the coupling.

Is a jaw coupling the right family at all?

Jaw couplings are excellent general-purpose devices, and wrong for some duties. Consider the alternatives honestly:

High torque, high misalignment, heavy duty — a gear coupling is the correct answer.
Severe shock, reversals, compressors — a grid coupling absorbs peaks that a spider cannot survive.
Large misalignment with zero maintenance — a tyre coupling is more tolerant and needs no lubrication.
Very high torque at low speed in dirt — a chain coupling is cheaper and tougher.

We manufacture all of them, so ask us which fits your drive rather than which we would rather sell. Our coupling selection guide compares the families side by side.

What to send us for a quote

Existing coupling size marking, or the four measurements listed above.
Motor kW and RPM.
Both shaft diameters and keyway sizes — measured.
Driven machine and duty — pump, fan, compressor; continuous or start-stop.
Ambient temperature, and any oil or chemical exposure.
Whether you need hubs and spider, or spiders only.
Quantity and delivery location.

Ordering spare spiders with the coupling is worth doing — the element is the wear part, and having one on the shelf turns a line stoppage into a ten-minute job.