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Curved jaw coupling with two hubs and a star-shaped polyurethane element
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Industrial Coupling

Curved Jaw Coupling

Two hubs with curved jaws drive through a star-shaped polyurethane element. Compact, low inertia and maintenance-free, it damps shock and plugs in axially.

  • Star-shaped polyurethane element
  • Curved jaws keep surface pressure low
  • Compact, low inertia, maintenance-free
  • Flange, brake-disc and brake-wheel types
Series
XL / LXD / XLS
Model sizes
126
Data tables
9
Drawings & catalogues
2
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No drawing? Send old coupling photos, nameplate details and shaft dimensions.

Engineering data

Overview and Where It Fits

A curved jaw coupling, often called a star coupling, has two hubs with convex jaws and a star-shaped polyurethane element between them. The curved contact faces keep surface pressure low, so the jaws do not wear or deform even under brief overload, while the element damps shock and takes small misalignment. It is compact, has low inertia and needs no maintenance; the hubs simply plug together axially. Sizes XL0 to XL16 cover 7.5 N·m to 18,650 N·m nominal torque with a 92 ShA element, about 70% more with 98 ShA, and bores up to 200 mm. Besides the basic type there are double-element, flanged, double- and single-flange, brake-disc and brake-wheel versions. Before we quote, please send the power or torque and speed, both shaft sizes with keyways, and the type you need.

Typical use

Pumps, fans and conveyors, plus hoisting and general drives that need a compact, maintenance-free elastic coupling.

Sizes and torque

XL0 to XL16: nominal torque 7.5 N·m to 18,650 N·m with a 92 ShA element (about 70% more with 98 ShA), bores 6 mm to 200 mm, speed up to 19,000 rpm.

Types

XL basic; ZT-S double element; ZT-F flanged (A–D); ZT-SF / ZT-DF double and single flange; ZT-P brake disc; ZT-Z brake wheel; LXD single flange (JB/T 10466-2004); XLS double flange (Q/JL01-2001).

Bores and temperature

Cylindrical bores as standard, keyways to your drawing; a taper bore only after a strength check. Working temperature −35 °C to +80 °C.

Engineering data

Selection Information to Confirm

Final model selection is based on the actual drive data and approved drawing. Provide the items you already know; unknown values can be reviewed by engineering.

Upload Drawing & Get Quote
  1. 01Required torque or motor power and service factor
  2. 02Operating speed, peak load, starts and reversing duty
  3. 03Shaft diameters d1/d2, keyways and fit requirements
  4. 04DBSE, overall length and available installation space
  5. 05Temperature, dust, moisture, corrosion and maintenance access
  6. 06Existing drawing, old part photo, nameplate or measured dimensions

Engineering data

Model and Dimension Data

Use each catalogue drawing together with its data table. Final torque, speed, bore, material and fit remain subject to the approved project drawing.

Choose a type

XL Curved Jaw Coupling data sheet

17 sizes
Dimension points to confirm
XL curved jaw coupling dimension drawing
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ModelEquivalent ZT modelNominal torque Tn N·mMax. speed n r/minBore d1, d2 mmBore length L mmL0 mmD mmD1/D2 mmD3 mmE mmS mmRadial comp. mmAxial comp. mmInertia kg·m²Weight kg
XL0ZT14A7.5190006–1611353030—131.50.21.00.000050.10
XL1ZT19A10140006–1925664032401620.41.20.000080.30
XL2ZT24A35106008–2430785540551820.81.40.00020.61
XL3ZT28A9595008–283590654865202.51.01.50.00071.00
XL4ZT38A190850010–38451148066782431.01.80.0022.08
XL5ZT42A265800010–42501269575942631.02.00.0043.21
XL6ZT48A310710010–485614010585104283.51.42.10.0064.41
XL7ZT55A410630015–5565160120981183041.42.20.0126.64
XL8ZT65A625560015–6575185135115—354.51.42.60.02510.13
XL9ZT75A1280475020–7585210160135—4051.83.00.05416.03
XL10ZT90A2400375030–90100245200160—455.51.83.40.13927.50
XL11ZT100A3300335030–115110270225180—5061.83.80.24538.50
XL12ZT110A4800300040–125120295255200—556.52.24.20.43554.0
XL13ZT125A6650265040–145140340290230—6072.24.60.8581.8
XL14ZT140A8600236040–160155375320255—657.52.25.01.4109.7
XL15ZT160A12800200060–180175425370290—7592.25.72.72162.7
XL16ZT180A18650180085–200195475420325—8510.52.26.44.95230.8

Torque values are for a 92 ShA polyurethane element; a 98 ShA element carries about 70% more. The misalignment table below gives the limits at 1500 r/min. Bores and keyways are machined to your drawing.

Engineering data

Related Applications

steel rolling mill coupling application for heavy-duty industrial drivesSteel Rolling MillsIn rolling mills, couplings must cope with high torque, shock loads, reversing duty and thermal…mining crusher coupling application for heavy-duty industrial drivesMining and CrushingCrushers and mining drives hit couplings with impact loads, material jams and dust, so overload protection…pump and fan coupling application for heavy-duty industrial drivesPumps and FansFor pumps and fans, speed, vibration, balancing and alignment accuracy decide which coupling fits.conveyor coupling application for heavy-duty industrial drivesConveyorsConveyor couplings start under load, run around the clock and have to tolerate dust and some misalignment.

Engineering data

Related Products

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Engineering data

Selection Guides and Technical Articles

Flexible Coupling Types for Industrial Drives: A Practical ComparisonFlexible coupling is a family, not one construction. Elastomeric, pin-bush, grid, diaphragm, tyre, jaw, and gear…Coupling Misalignment Symptoms and Prevention MethodsThis guide covers “Coupling Misalignment Symptoms and Prevention Methods”. Wear patterns, lubricant condition…Selecting a Diaphragm Coupling for Pumps and Fans: Operating Speed, Alignment, and Spacer RequirementsA Diaphragm Coupling transmits torque through metal diaphragm packs and does not rely on lubricated gear teeth. It is…How Should an Old Coupling Be Measured for Replacement? Dimensions, Photos, and Wear-Correction ChecklistThe old part may be worn, deformed, or modified in the field. The purpose of replacement measurement is not to…

FAQ

Product Selection FAQ

What is the difference between a curved jaw (star) coupling and a jaw (plum) coupling?

Both drive through an elastomer between two jaw hubs. A curved jaw coupling has convex jaws and a star-shaped polyurethane element, which keeps contact pressure low and the coupling compact. A jaw (plum) coupling to GB/T 5272 uses straight jaws and a multi-petal element. Not sure which one you have? Send us a photo.

Which element hardness should I choose?

The table torques are for a 92 ShA element, which damps shock well. A 98 ShA element carries about 70% more torque but is stiffer. Tell us the load and the machine, and we suggest one.

Can I change the element without moving the machines?

Yes, with the ZT-SF double-flange type or the ZT-F types B and D: remove the flange and change the element radially. With the basic XL type, one machine has to be moved back far enough to separate the hubs.

Can you replace a coupling made to another standard or brand?

Usually yes. Send us the nameplate, a photo or a drawing with both shaft sizes, the jaw outside diameter and the overall length, and we match a size or make it to your dimensions.

What do you need from me for a quote?

Motor power or torque and speed, both shaft diameters and keyways, and the type you need. For brake-disc or brake-wheel types, add the disc or wheel size. Please also tell us the quantity.

Engineering data

Send an Engineering RFQ

Complete the contact step first, then add the operating data you already know. Unknown engineering values do not block submission.

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