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Heavy-duty Diaphragm Coupling for steel mills, cranes, mining and port equipment
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Industrial Coupling

Diaphragm Coupling

Designed for high-speed blowers, pumps, fans and low-backlash precision drives; no lubrication, low backlash and good dynamic balance performance.

  • Diaphragm torque transmission
  • Compensates multi-direction offset
  • High speed and precision
  • Wear-free, low inertia
Series
JMII / JMIIJ / DJM / SJM / JZM
Model entries
110
HTML tables
5
Drawings / files
12
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No drawing? Send old coupling photos, nameplate details and shaft dimensions.

Documented engineering data

Product Overview and Application Boundary

A diaphragm coupling consists of two hubs, metallic diaphragm packs, precision bolts and, when required, a spacer section. Shaft misalignment is compensated through elastic deformation of the diaphragms in axial, angular and radial directions. The structure requires no lubrication and offers high torsional stiffness, low backlash, good balancing performance and low maintenance. It is suitable for pumps, fans, compressors, high-speed motors, servo drives and precision equipment. Selection should confirm rated torque, peak torque, speed, shaft distance, bore, keyway, balancing grade, ambient temperature and whether a single-diaphragm, double-diaphragm or spacer type is required.

Typical use

Recommended for high-speed blowers, pumps, fans and low-backlash precision drives.

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 Diaphragm Coupling

This route follows Diaphragm 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 Diaphragm Coupling
Typical machining and heat-treatment route for Diaphragm 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/flange datums, bolt circle and face machining: Machine the named teeth, grooves, holes, splines or mechanism features by turning, milling, hobbing, shaping, drilling, boring or grinding as specified.
  6. 06. Laser/wire-cut diaphragm plates and finish bolt holes: Cut diaphragm sheets by the approved laser, waterjet or wire-EDM route, finish the bolt pattern and remove burrs without damaging the sheet surface.
  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. Hub hardness and diaphragm flatness/PT inspection: Check hardness, effective case where applicable, distortion and surface condition; perform UT, MT or PT when required before final machining.
  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. Diaphragm pack, runout and 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.

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

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.

JMII Diaphragm Coupling data sheet

Source: JB/T9147-1999
Dimension points to confirm
JMII Diaphragm Coupling dimension drawing with bore, outside diameter, length and installation confirmation points
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ModelNominal torque Tn N·mInstantaneous max torque Tmax (N·m)Maximum speed nmax r/minBore diameterBore length LMain dimensions mmTorsional stiffness ×10⁶ (N·m/rad)Weight kgMoment of inertia kg·m²
J1/Y type LRecommended LDD1t
JMII140631070014-2827-623580398±0.20.370.90.0005
JMII263100930020-3838-824092538±0.20.451.40.0011
JMII3100200840025-4544-11245102638±0.20.562.10.002
JMII4250400670030-5560-112551287711±0.30.814.20.006
JMII5500800590035-6560-142651459111±0.31.26.40.012
JMII68001250510040-7584-1427516810514±0.31.429.60.024
JMII710002000475045-8084-1728018011215±0.41.912.50.0365
JMII816003150430050-8584-1728020012015±0.42.3515.50.057
JMII925004000420055-8584-1728020512020±0.42.716.50.065
JMII1031505000400055-9084-1729021512820±0.43.0219.50.083
JMII1140006300365060-95107-17210023513223±0.53.46250.131
JMII1250008000340060-100107-21210025014523±0.53.67300.174
JMII13630010000320063-110107-21211027015523±0.55.2360.239
JMII14800012500285065-110107-21211530016227±0.67.8450.38
JMII151000016000270070-125107-21212532017627±0.68.43550.5
JMII161250020000245075-130107-25214035018632±0.710.23750.85
JMII171600025000230080-140132-25214537020332±0.710.97851.1
JMII182000031500215090-160132-30216540023038±0.913.071151.65
JMII1925000400001950100-170167-30217544024538±0.914.261502.69
JMII2031500500001850110-180167-30218546026038±0.922.131703.28
JMII2135500560001800120-200167-35220048028038±0.923.72004.28
JMII2240000630001700130-200202-30221050029538±0.924.62305.18
JMII2350000800001600140-220202-30222054031044±129.712757.7
JMII24630001000001450150-240202-41024060033550±1.232.643809.3
JMII25800001250001400160-250242-41025562035050±1.237.6941015.3
JMII26900001400001300180-260242-41027566038550±1.250.4351020.9
JMII271120001800001200190-280282-47029572041060±1.471.5262032.4
JMII281400002000001150220-300282-47030074042060±1.493.3768036
JMII291600002240001100240-320330-47032077045060±1.4114.5378043.9
JMII301800002800001050250-340330-55035082049060±1.4130.7695060.5

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.

PDFJMI Diaphragm Coupling catalogue PDFOpen filePDFJMIJ Diaphragm Coupling catalogue (JB/T9147-1999) PDFOpen filePDFJMII Diaphragm Coupling catalogue PDFOpen filePDFJMIIJ Diaphragm Coupling catalogue (JB/T9147-1999) PDFOpen filePDFDJM Diaphragm Coupling catalogue PDFOpen filePDFJZM Diaphragm Coupling catalogue PDFOpen filePDFSJM Diaphragm Coupling catalogue 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

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FAQ

Product Selection FAQ

Can the Diaphragm 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 Diaphragm Coupling?

Recommended for high-speed blowers, pumps, fans and low-backlash precision drives.

What should be checked during installation and maintenance?

Check alignment, hub fit, spacer length, bolt tightening and the condition of each diaphragm pack. Avoid forcing the assembly into position and inspect for fretting, cracks or permanent deformation.

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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