The JSB Shell Axial Mount Grid Coupling combines serpentine spring flexibility with an axially removable shell, permitting fast spring replacement by sliding the cover along the shaft. With 16 sizes from 45 to 63,000 N·m and maximum speeds reaching 6,000 rpm, it excels in high-speed, space-constrained industrial drives.
The JSB Shell Axial Mount Grid Coupling is an advanced metallic flexible coupling engineered for applications demanding both high rotational speed and space-efficient maintenance access. Featuring a single-piece axially removable shell, this coupling allows technicians to inspect or replace the serpentine spring by sliding the cover along the shaft centreline — eliminating the need for radial lifting space above the coupling.
Available in 16 standardised sizes from JSB1 (45 N·m) to JSB16 (63,000 N·m), the JSB series achieves maximum permissible speeds of up to 6,000 rpm on smaller models, making it the highest-speed variant within the grid coupling family. The serpentine spring delivers 36% average vibration damping, 99.47% transmission efficiency, and a 2× short-term overload capacity — the same proven performance characteristics shared across the entire grid coupling product line.
Maximum permissible speed of 6,000 rpm for smaller sizes (JSB1–JSB5) makes this variant the top choice for high-speed motor and turbine couplings within the grid coupling family.
The one-piece shell slides off along the shaft axis, allowing complete spring access without radial clearance — ideal where guards, piping, or adjacent machines limit vertical lifting space.
With outer diameters ranging from 112 mm (JSB1) to 584 mm (JSB16), the axial mount shell maintains a slim profile that fits inside standard machine guards and coupling enclosures.
The serpentine spring element absorbs torsional oscillations, protecting downstream bearings and gearboxes from resonance-induced fatigue damage.
Short-term peak torques up to twice the nominal rating are safely absorbed, providing a protective buffer during motor start-up and process transients.
Only five core components — two hubs, one axial shell, one serpentine spring, and seals — minimise spare parts inventory and simplify field servicing across all 16 sizes.
The JSB grid coupling shares the fundamental five-component architecture of the JS series, with the shell re-engineered for axial (along-shaft) removal.
1 & 5 — Half Couplings (Hubs): Precision-machined steel hubs with involute tooth profiles that engage the serpentine spring. Keyway bores conform to standard profiles across the full diameter range from 18 mm to 260 mm.
2 — Serpentine Spring: A continuous wave-form spring manufactured from high-grade spring steel with controlled heat treatment, providing the coupling's characteristic flexibility, damping, and overload resilience.
3 — Axial Shell (Cover): A single-piece cylindrical shell that encloses the spring and retains lubricant. Slides axially for removal, requiring only shaft-end clearance equal to the shell length.
4 — Lubrication Port: Positioned on the shell circumference for periodic re-greasing without disassembly.
The axial shell design is optimised for installations where overhead crane access or radial clearance is unavailable. To explore the full range of grid coupling mounting options, visit our product catalogue.
Complete dimensional and performance data for all 16 JSB sizes.
Note: Weight calculated without bore holes. All shaft bores can be customised to client specifications.
The JSB axial mount grid coupling serves industries where high speed, compact installation, and rapid maintenance define the coupling selection criteria.
Driving high-speed spindles, looms, and winding machines where rotational speeds above 4,000 rpm demand a coupling rated for continuous high-speed duty with minimal imbalance.
| Model (New) | Model (Legacy) | Nominal Torque Tn (N·m) |
Max Speed (rpm) |
Shaft Bore d (mm) | Bore Length L (mm) |
L₂ (mm) | D (mm) | Clearance C (mm) |
Weight (kg) |
Lubricant (kg) |
|---|---|---|---|---|---|---|---|---|---|---|
| JSB1 | JS201 | 45 | 6,000 | 18, 19, 20, 22, 24, 25, 28 | 47 | 48 | 112 | 3 | 1.95 | 0.0272 |
| JSB2 | JS202 | 140 | 6,000 | 22, 24, 25, 28, 30, 32, 35 | 47 | 48 | 122 | 3 | 2.59 | 0.048 |
| JSB3 | JS203 | 224 | 6,000 | 25, 28, 30, 32, 35, 38, 40, 42 | 50 | 51 | 130 | 3 | 3.36 | 0.0544 |
| JSB4 | JS204 | 400 | 6,000 | 32, 35, 38, 40, 42, 45, 48, 50 | 60 | 61 | 149 | 3 | 5.45 | 0.068 |
| JSB5 | JS205 | 630 | 6,000 | 40, 42, 45, 48, 50, 55, 56 | 63 | 64 | 163 | 3 | 7.26 | 0.0862 |
| JSB6 | JS206 | 900 | 5,500 | 48, 50, 55, 56, 60, 63, 65 | 76 | 67 | 174 | 3 | 10.44 | 0.113 |
| JSB7 | JS207 | 1,800 | 4,750 | 55, 56, 60, 63, 65, 70, 71, 75, 80 | 89 | 89 | 200 | 3 | 17.7 | 0.172 |
| JSB8 | JS208 | 3,150 | 4,000 | 65, 70, 71, 75, 80, 85, 90, 95 | 98 | 96 | 233 | 3 | 25.42 | 0.254 |
| JSB9 | JS209 | 5,600 | 3,250 | 75, 80, 85, 90, 95, 100, 110 | 120 | 121 | 268 | – | 42.22 | 0.427 |
| JSB10 | JS210 | 8,000 | 3,000 | 80, 85, 90, 95, 100, 110, 120 | 127 | 124 | 287 | – | 54.48 | 0.508 |
| JSB11 | JS211 | 12,500 | 2,700 | 90, 95, 100, 110, 120, 125, 130, 140 | 149 | 143 | 320 | 6 | 81.72 | 0.735 |
| JSB12 | JS212 | 18,000 | 2,400 | 110, 120, 125, 130, 140, 150, 160, 170 | 162 | 146 | 379 | 6 | 122.58 | 0.908 |
| JSB13 | JS213 | 25,000 | 2,200 | 120, 125, 130, 140, 150, 160, 170, 180, 190, 200 | 184 | 156 | 411 | 6 | 180.24 | 1.135 |
| JSB14 | JS214 | 35,500 | 2,000 | 140, 150, 160, 170, 180, 190, 200 | 183 | 204 | 476 | – | 230.18 | 1.952 |
| JSB15 | JS215 | 50,000 | 1,750 | 160, 170, 180, 190, 200, 220, 240 | 216 | 216 | 533 | – | 321.43 | 2.815 |
| JSB16 | JS216 | 63,000 | 1,600 | 180, 190, 200, 220, 240, 250, 260 | 216 | 226 | 584 | – | 448.55 | 3.496 |
Connecting motors to mixers, conveyors, and centrifugal separators in hygienic environments where compact profiles reduce contamination surfaces and simplify washdown access.
Coupling servo-driven main shafts on form-fill-seal machines and palletisers where precise torque transmission and rapid maintenance turnarounds are production-critical.
Driving large centrifugal chillers, cooling tower fans, and air handling units where vibration isolation between motor and driven equipment reduces structural noise transmission.
★★★★★ — Sugar Mill, Brazil
Industry: Sugar & Ethanol | Application: Cane Shredder Drive
We retrofitted JSB8 couplings on four cane shredder drives operating at 3,100 rpm. The axial shell design was essential because our shredder housings have only 40 mm radial clearance to the support frame. After two crushing seasons totalling 14,000 operating hours, the springs showed no measurable wear and bearing vibration levels remain well within ISO 10816 limits.
— Reliability Engineer, Ribeirao Preto Mill
★★★★★ — Automotive Assembly, Japan
Industry: Automotive Manufacturing | Application: Paint Line Conveyor
Our paint line conveyor drives require couplings that tolerate frequent start-stop cycles — over 200 per shift. The JSB5 units have operated for 26 months without a single unplanned stoppage. The compact 163 mm OD fits perfectly inside our safety guards without modification.
— Production Engineering Manager, Aichi Prefecture Plant
★★★★☆ — Gold Mine, South Africa
Industry: Mining & Minerals | Application: Ball Mill Auxiliary Drive
We specified JSB11 couplings for three ball mill classifier drives at 12,500 N·m. Installation was straightforward and the axial shell access suited our underground machine room where crane clearance is nonexistent. We deducted one star only because we would prefer a stainless lubrication port for our corrosive underground atmosphere.
— Shaft Maintenance Planner, Witwatersrand Operations
From single replacement units to multi-year OEM supply agreements, RP delivers JSB axial mount grid couplings with factory-direct pricing, precision bore machining, and worldwide logistics. Every coupling ships with a dimensional inspection certificate and 12-month product warranty.
Response within 24 hours | Custom bores available
We specified JSB11 couplings for three ball mill classifier drives at 12,500 N·m. Installation was straightforward and the axial shell access suited our underground machine room where crane clearance is nonexistent. We deducted one star only because we would prefer a stainless lubrication port for our corrosive underground atmosphere.
— Shaft Maintenance Planner, Witwatersrand Operations
From single replacement units to multi-year OEM supply agreements, RP delivers JSB axial mount grid couplings with factory-direct pricing, precision bore machining, and worldwide logistics. Every coupling ships with a dimensional inspection certificate and 12-month product warranty.
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Response within 24 hours | Custom bores available
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