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Heavy-duty LK Elastic Block Coupling for steel mills, cranes, mining and port equipment
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Industrial Coupling

LK Elastic Block Coupling

Designed for heavy auxiliary drives, conveyors and equipment requiring replaceable elastic blocks; elastic buffering with modular replacement and practical maintenance.

  • Elastic block damping
  • Compact structure
  • Easy maintenance
  • Bore and keyway customization
Series
LK
Model entries
23
HTML tables
2
Drawings / files
2
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No drawing? Send old coupling photos, nameplate details and shaft dimensions.

Documented engineering data

Product Overview and Application Boundary

An LK elastic block coupling consists of two hubs, connecting body, replaceable elastic blocks and fasteners. Torque is transmitted through the elastic blocks, providing cushioning, vibration reduction and compensation for small installation deviations. Its advantage is modular elastic elements and convenient replacement, making it suitable for conveyors, hoists, heavy auxiliary drives and applications where downtime must be controlled. Selection should confirm torque, speed, bore, keyway, elastic block specification, outside diameter space, working temperature and maintenance method. For replacement, old coupling photos, dimensions and installation space should be provided.

Typical use

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

Selection focus

Confirm torque, speed, shaft diameter, keyway, service factor, misalignment and working environment before selection.

Custom options

Bore, keyway, material, heat treatment, dynamic balancing, surface treatment and export packing can be customized.

Material and inspection

Common materials include 45 steel, 42CrMo or project-specified grades; inspection records can be supplied on request.

Manufacturing Control

Machining, Heat Treatment and Inspection Process for LK Elastic Block Coupling

This route follows LK Elastic 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 LK Elastic Block Coupling
Typical machining and heat-treatment route for LK Elastic 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 named teeth, grooves, holes, splines or mechanism features by turning, milling, hobbing, shaping, drilling, boring or grinding as specified.
  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.

Documented 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.

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  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

Documented engineering data

Model and Dimension Data

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

LK Elastic Block Coupling data sheet

Source: JB/T9148-99
Dimension points to confirm
LK LK Elastic 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 r/minBore 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

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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.

Documented 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 LK Elastic Block Coupling catalogue (JB/T9148-99) PDFOpen file

Documented engineering data

Related Applications

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Documented engineering data

Related and Alternative Products

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Documented engineering data

Selection Guides and Technical Articles

Elastic Coupling for Circulating Water Pump | Selection GuideElastic Coupling selection for circulating water pump: torque, speed, bore, keyway, load, alignment, maintenance, RFQ d…Coupling Misalignment Symptoms and Prevention MethodsPractical guidance on coupling misalignment, including torque, speed, bore, keyway, operating duty and RFQ data for eng…

FAQ

Product Selection FAQ

Can the LK Elastic Block Coupling be customized from a drawing or old part?

Yes. We can confirm bore, keyway, material, heat treatment, balancing grade, surface treatment and export packing by drawing or old part photos.

What information is needed before quotation?

Please send torque or motor power, speed, shaft diameter, keyway, equipment type, working condition, quantity, drawings or old coupling photos.

Can it replace an imported coupling brand?

Replacement is evaluated after checking dimensions, torque, material, installation space and working condition. Final drawings should be confirmed before production.

What applications are a good fit for the LK Elastic Block Coupling?

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

What should be checked during installation and maintenance?

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.

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