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Rubber block coupling (LK series) with rubber blocks between the drive arms
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Industrial Coupling

Rubber Block Coupling

For heavy auxiliary drives, conveyors and machines where you'd rather swap elastic blocks than whole couplings. Cushioned, modular and easy to maintain.

  • Elastic block damping
  • Compact structure
  • Easy maintenance
  • Bore and keyway customization
Series
LK
Model sizes
23
Data tables
2
Drawings & catalogues
2
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

Two hubs, a connecting body, a set of replaceable elastic blocks and fasteners. Torque goes through the blocks, which cushion shock, reduce vibration and take up small installation errors. The real advantage is maintenance: the blocks are modular, so changing them is quick. That's why it's used on conveyors, hoists, heavy auxiliary drives and anywhere downtime has to stay short. For selection we need torque, speed, bore, keyway, block size, the space available for the outside diameter, working temperature and how you plan to maintain it. For a replacement, photos of the old coupling, its dimensions and the installation space help a lot.

Typical use

Recommended for heavy auxiliary drives, conveyors and equipment requiring replaceable elastic blocks.

Selection focus

Before we pick a size, we check torque, speed, shaft diameter, keyway, service factor, misalignment and the working environment.

Custom options

We can tailor the bore, keyway, material, heat treatment, dynamic balancing, surface finish and export packing to your job.

Material and inspection

Typical materials are 45 steel (C45 / AISI 1045) and 42CrMo (42CrMo4 / AISI 4140), or whatever grade your project specifies. Inspection records are available on request.

Manufacturing Control

Machining, Heat Treatment and Inspection Process for Rubber Block Coupling

This route follows Rubber Block Coupling from drawing and material review through blank preparation, CNC rough machining, feature machining, heat treatment, reinspection, finish machining, assembly and final release. The approved drawing determines the exact material and treatment route.

Manufacturing and inspection flowchart for Rubber Block Coupling
Typical machining and heat-treatment route for Rubber Block Coupling; drawing-specific operations are released only after technical approval.
  1. 01. Drive data and drawing review: Confirm torque, speed, shaft interfaces, alignment allowance, acceptance criteria and the approved drawing before release.
  2. 02. Material certificate and blank inspection: Verify material identity, certificate, heat number, blank dimensions and the specified forging, casting or bar-stock route.
  3. 03. Saw cutting and forging/casting blank preparation: Saw-cut the stock or prepare the forging/casting blank, remove scale, transfer traceability marks and retain machining allowance.
  4. 04. CNC rough turning of faces, diameters and bores: Use CNC or vertical lathes to rough-turn faces, outside diameters, bores and datum shoulders, leaving allowance for heat-treatment distortion and finishing.
  5. 05. Hub, connecting-body and driving-slot machining: Machine the features shown on the approved drawing by turning, milling, hobbing, shaping, drilling, boring or grinding.
  6. 06. Elastic-block moulding/cure or incoming inspection: Manufacture or verify the spring, pin, bearing, friction or elastomer element to the released specification, with batch traceability where required.
  7. 07. Hub/flange normalizing, Q&T or stress relief: Normalize, quench-and-temper or stress-relieve steel hubs and flanges as specified while protecting established datums; diaphragm and elastomer parts remain under separate material controls.
  8. 08. Metal heat-treatment and elastomer cure/batch verification: Control metal-part heat treatment separately from elastomer moulding and vulcanization; verify elastomer batch certificate, hardness, dimensions and visible defects before assembly.
  9. 09. Bore, keyway and fit finishing: Finish-turn or grind datum faces and fits, then bore the shaft holes and machine keyways, splines, seal seats or mounting interfaces to the approved tolerances.
  10. 10. Elastic-element fit and final assembly inspection: Verify dimensions, runout, tooth or component fit and controlled assembly; record lubrication, fastener, balance or functional checks applicable to the product.
  11. 11. Final inspection, marking and release: Complete final inspection, traceability marking, rust protection and packing only after the required records and acceptance results are complete.

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.

Rubber Block Coupling data sheet

Source: JB/T9148-99
Dimension points to confirm
LK Rubber Block Coupling dimension drawing with bore, outside diameter, length and installation confirmation points
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On smaller screens, swipe horizontally or view the compact model cards.

ModelNominal torque Tn N·mAllowable speed n rpmBore diameterBore length LMain dimensions mmWeight kgMoment of inertia kg·m²
Y type LJ1 type L1Recommended LDBS
LK110000195085,90,9517213215037019051254
100,110,120212167
95172132
LK2160001750100,110,120,12521216717041520852005.2
130252202
LK3250001600110,120,12521216718545022552656.3
130,140,150252202
LK4400001400130,140,150252202210520260533821.5
160,170,180302242
LK5630001200160,170,180302242230600275658026.6
190,200,220352282
LK61000001170190,200,220352282260620285662529.3
240,250,260410330
220352282
LK71250001080240,250,260410330280670295678055
280470380
LK8160000990240,250,260410330300730305688080
280,300,320470380
260410330
LK9200000950280,300,32047038032076031561075100
340550450
LK10250000920280,300,32047038034579034561270120
340,360550450
LK11315000820300,32047038036085038071545192
340,360,380550450
320470380
LK12400000790340,360,38055045038091042071820255
400650540
LK13500000750360,38055045040096046082245332
400,420,440650540
LK14630000690400,420,440,450,460,480650540450105050582670520
LK15900000600440,450,460,480,5006505405001200550104401708
530800680
LK161250000535460,480,50065054052013505701048701248
530,560800680
LK171600000480530,560,600,63080068060015006501059001930
LK182000000450560,600,63080068065016007301270002650
670900780
LK19250000042063080068068017007801288504080
670,710,750900780
LK203150000380710,750900780750190082012120605500
800,8501000880

Weight and moment of inertia are approximate values; instantaneous maximum torque must not exceed 1.5 times the nominal torque Tn.

LK / LKA Elastic Block Coupling allowable compensation

Source: JB/T9148-99

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

Allowable compensationModel
LK1~LK4 / LKA1LK5~LK15 / LKA2~LKA11LK16~LK18 / LKA12~LKA14LK19~LK20 / LKA15~LKA20
Axial Δx /mm±1.5±2±2.5±3
Radial Δy /mm0.50.80.81
Angular Δα0°30′0°30′0°15′0°15′

The allowable compensation values in the table refer to shaft relative displacement under working conditions caused by manufacturing error, installation error, load variation, shock, vibration, base deformation and temperature change.

Engineering data

Product Documents and Drawing Files

Only files currently linked to this product are listed. Request the required model if the correct revision is not shown.

PDFLK Rubber Block Coupling catalogue (JB/T9148-99) PDFOpen file

Engineering data

Related Applications

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.paper mill coupling application for heavy-duty industrial drivesPaper MillPaper machines run nonstop in humid, corrosive conditions where roll alignment is critical.

Engineering data

Related Products

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Engineering data

Selection Guides and Technical Articles

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FAQ

Product Selection FAQ

Can you make a rubber block coupling from my drawing or an old part?

Yes. Send the drawing, or just photos of the old part, and we'll work out the bore, keyway, material, heat treatment, balancing grade, surface finish and packing from there.

What do you need from me for a quote?

Torque or motor power, speed, shaft diameters, keyways, what the equipment is, how it runs, how many you need, and a drawing or photos of the old coupling. Missing some of it? Send what you have and we'll ask for the rest.

Can it replace a coupling from an imported brand?

Usually, yes. We compare dimensions, torque, material, installation space and the working conditions first, and you sign off the final drawing before production starts.

Where is a rubber block coupling typically used?

It's mostly used for heavy auxiliary drives, conveyors and equipment requiring replaceable elastic blocks.

What should I check when installing and maintaining it?

Check shaft alignment, bore and keyway fit, fastener tightening and the condition of the elastic element. Replace the elastic element if cracking, hardening, permanent deformation or abnormal clearance is found.

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
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