liujinsong@czahlzq.com+86 151 3177 0577
Jaw coupling with two jaw hubs and a multi-petal elastomer element
Select a thumbnail. Hover or tap the main image to inspect details.

Industrial Coupling

Jaw Coupling

Two jaw hubs drive through a one-piece multi-petal elastomer. No lubrication and quick to assemble, it damps shock and takes misalignment on pumps, fans, conveyors and general drives.

  • One-piece multi-petal elastomer
  • No lubrication, easy assembly
  • Damps shock, takes misalignment
  • Double-flange, brake wheel and brake disc types
Series
LM / LMS / LML / LMPK
Model sizes
47
Data tables
5
Drawings & catalogues
3
Upload Drawing & Get QuoteAsk on WhatsAppView Model Tables

No drawing? Send old coupling photos, nameplate details and shaft dimensions.

Engineering data

Overview and Where It Fits

A jaw coupling, also called a spider or plum coupling, has two hubs with interlocking jaws and a one-piece multi-petal elastomer element between them. Torque passes through the element, which damps shock and vibration and lets the shafts run with small angular, radial and axial misalignment. There is nothing to lubricate, and the coupling is quick to assemble. It suits pumps, fans and conveyors, as well as hoisting and general drives that start often or reverse. Sizes LM50 to LM400 (GB/T 5272-2017) cover 28 N·m to 14,000 N·m nominal torque and bores from 10 mm to 160 mm. The LMS double-flange type lets you change the element without moving the machines, LML adds a brake wheel and LMPK a brake disc. Before we quote, please send the power or torque and speed, both shaft sizes with keyways, and the bore type. Is your old coupling marked LM5, LMD5 or LMZ5-I? Send us the nameplate and we will match it.

Typical use

Pumps, fans and conveyors, plus hoisting and general drives that start often or reverse, in metallurgy, mining and chemical plants.

Sizes and torque

LM50 to LM400 (GB/T 5272-2017): nominal torque 28 N·m to 14,000 N·m (max. 25,200 N·m), bores 10 mm to 160 mm, speed up to 15,000 rpm.

Types

LM basic type; LMS double flange (element changed without moving the machines); LML with brake wheel D0 160–710 mm; LMPK with brake disc 355–1000 mm.

Bores and temperature

Y, J or Z (1:10 taper) bores to GB/T 3852, keyways to your drawing. Working temperature −30 °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

LM Jaw Coupling data sheet (GB/T 5272-2017)

53 sizes | Source: GB/T 5272-2017
Dimension points to confirm
LM jaw coupling dimension drawing
Select a thumbnail. Hover or tap the main image to inspect details.

On smaller screens, swipe horizontally or view the compact model cards.

ModelNominal torque Tn N·mMax. torque Tmax N·mMax. speed n r/minBore d1, d2, dz mmBore length mmDimensions mmInertia kg·m²Weight kg
Y type LJ, Z type L1J, Z type LD1D2H
10,1122——
LM5028501500012,1427——5042160.00021.00
16,18,1930——
20,22,2438——
12,1427——
16,18,1930——
LM701122001100020,22,2438——7055230.00112.50
25,2844——
30,32,35,3860——
16,18,1930——
LM85160288900020,22,2438——8560240.00223.42
25,2844——
30,32,35,3860——
18,1930——
20,22,2438——
LM105355640725025,2844——10565270.00515.15
30,32,35,3860——
40,4284——
20,22,24385238
LM125450810600025,2844624412585330.01410.1
30,32,35,38*608260
40,42,45,48,50,5584——
25,28446244
LM1457101280525030,32,35,3860826014595390.02513.1
40,42,45*,48*,50*,55*8411284
60,63,65107——
30,32,35,38608260
LM17012502250450040,42,45,48,50,558411284170120410.05521.2
60,63,65,70,75107——
80,85132——
35,38608260
LM20020003600375040,42,45,48,50,558411284200135480.11933.0
60,63,65,70*,75*107142107
80,85,90,95132——
40,42,45,48,50,558411284
LM23031505670325060,63,65,70,75107142107230150500.21745.5
80,85,90,95132——
45,48,50,558411284
LM26050009000300060,63,65,70,75107142107260180600.45875.2
80,85,90*,95*132172132
100,110,120,125167——
60,63,65,70,75107142107
LM300710012780250080,85,90,95132172132300200670.80499.2
100,110,120,125167——
130,140202——
60,63,65,70,75107142107
LM3601250022500215080,85,90,95132172132360225731.73148.1
100,110,120*,125*167212167
130,140,150202——
80,85,90,95132172132
LM40014000252001900100,110,120,125167212167400250732.84197.5
130,140,150202——
160242——

Data to GB/T 5272-2017. Bores marked * are not available as J or Z type; a dash means not available. Weight and inertia are for the longest Y bore and the smallest bore. 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

GIICL drum gear coupling with crowned teethDrum Gear CouplingCrowned-tooth gear couplings for rolling mills, cranes, mining drives and port equipment. They carry high torque and take angular, axial and radial misalignment.Also used in: Steel Rolling Mills, Mining and Crushing, ConveyorsJS grid coupling with serpentine spring gridGrid CouplingGrid couplings for belt conveyors, crushers, induced-draft fans and auxiliary drives that take shock. The spring grid damps torsional vibration, and maintenance is simple.Also used in: Mining and Crushing, Pumps and Fans, ConveyorsSafety coupling with overload release mechanismSafety CouplingFor feeders, uncoilers, shear lines and other drives where a jam can wreck things. It releases at a set overload to protect shafts, gearboxes and the machine.Also used in: Steel Rolling Mills, Mining and Crushing, ConveyorsTorque limiter coupling with preset release torqueTorque Limiter CouplingFor flying shears, cutting lines and drives that need a precise overload point. It releases at the same torque every time and protects the drive train.Also used in: Steel Rolling Mills, Mining and Crushing, Conveyors

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 do model names like LM145 or LML200-400 mean?

In GB/T 5272-2017 the number is the size, equal to the outside diameter of the LM coupling in millimetres: LM145 is 145 mm across. LMS145 is the double-flange version of the same size, LML200-400 is size 200 with a 400 mm brake wheel, and LMPK is the brake-disc type.

My old coupling is marked LM5, LMD5 or LMZ5-I. Can you replace it?

Yes. These names come from the older GB/T 5272-2002 standard. Send us the nameplate, a photo or the old drawing with both shaft sizes, and we match it to the current size or make it to the old dimensions.

When should the elastomer element be replaced?

Check it at every maintenance stop. Replace it if it is cracked, worn, hardened or permanently squashed, or if the coupling starts to knock when the drive starts or reverses.

Can I change the element without moving the motor or gearbox?

With the LMS double-flange type, yes: undo the flange bolts and take the element out without moving either machine. With the basic LM type, one machine has to be moved back far enough to separate the hubs.

What do you need from me for a quote?

Motor power or torque and speed, both shaft diameters and keyways, and the bore type (Y, J or Z). For LML or LMPK, add the brake wheel or brake disc 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.

12
Contact
Upload Drawing & Get QuoteAsk on WhatsApp