JSD Single Flange Grid Coupling

JSD Single Flange Grid Coupling

The JSD Single Flange Grid Coupling features one flanged hub and one keyed shaft hub, bridging flange-connected and shaft-mounted equipment. With 19 sizes from 45 to 160,000 N·m, it provides the flexibility needed for mixed-interface drive trains in power generation, steel production, and heavy process machinery.

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JSD Single Flange Grid Coupling – Hybrid Flange-to-Shaft Serpentine Spring Coupling

The JSD Single Flange Grid Coupling is a hybrid connection solution that pairs one flanged hub (connecting flange d1) with one standard keyed shaft hub (half-shaft coupling d). This asymmetric design addresses a common industrial scenario: connecting a flanged output – such as a gearbox or turbine flange – to a cylindrical keyed shaft on a motor, pump, or generator.

Spanning 19 models from JSD1 (45 N·m) to JSD19 (160,000 N·m), the coupling retains the serpentine spring core technology with 36% vibration damping, 99.47% transmission efficiency, and 2x overload tolerance. The single flange design is lighter and more compact than the double flange JSS variant, making it the economical choice when only one equipment interface requires a flanged connection.

JSD Single Flange Grid Coupling with hybrid shaft-flange interface

Fig. 1 – JSD Single Flange Grid Coupling product assembly

Engineering Advantages of the Single Flange Design

Mixed Interface Compatibility

One flange end connects to bolted equipment interfaces (gearboxes, turbines, generators), while the keyed shaft end mounts directly on a cylindrical shaft – bridging two different coupling philosophies in a single unit.

Reduced Weight vs. Double Flange

By replacing one flanged hub with a standard keyed hub, the JSD saves 15–30% weight compared to the equivalent JSS model, reducing bearing loads and foundation requirements.

Variable Shaft Gap (L2)

Each model specifies minimum and maximum L2 distances between the flange face and shaft hub face, accommodating different equipment spacings during installation.

Dual Bore Specifications

The flange side (d1) and shaft side (d) each support independent bore diameter ranges, allowing engineers to match different shaft sizes on driving and driven equipment.

Serpentine Spring Damping

The same premium spring steel element used across all grid coupling variants absorbs torsional oscillations, protecting both the flanged and shaft-mounted equipment from resonance damage.

Field-Replaceable Spring

Spring replacement requires only shell removal – no need to disconnect the flange bolts or withdraw the shaft hub from its keyed connection.

Structural Configuration

The JSD coupling combines elements of both the JS standard and JSS double flange designs:

Flange Hub (Connecting Flange d1): One hub integrates a precision-drilled connecting flange with bolt circle matching the driven equipment. Available flange bores are listed separately from the shaft-side bores.

Shaft Hub (Half-Shaft Coupling d): The opposite hub is a standard keyed-bore hub identical to those used in JS and JSB couplings. This provides a familiar and proven shaft-mounting interface.

Serpentine Spring & Shell: The spring and enclosing shell are functionally identical to other grid coupling variants. Two shell configurations are used: JSD1–JSD13 employ a compact design, while JSD14–JSD19 use a reinforced shell with larger clearance gaps.

The JSD is the natural choice when retrofitting a flanged gearbox output to a keyed motor shaft, or vice versa. For installations where both ends require flanges, see the JSS double flange grid coupling.

JSD single flange grid coupling engineering drawing

Fig. 2 – JSD Single Flange Grid Coupling cross-section and dimensional drawing

Technical Specifications – JSD Single Flange Grid Coupling

Full specifications for all 19 JSD sizes. Bore diameter listings show flange-side and shaft-side options separated by slashes where applicable.

JSD single flange grid coupling dimensional reference

Fig. 3 – JSD Single Flange Grid Coupling complete dimensional reference

Model Nominal Torque
Tn (N·m)		 Max Speed
(rpm)		 Shaft Bore d
(Flange d1 / Shaft d)		 Flange L
(mm)		 Shaft L
(mm)		 L2 Min
(mm)		 L2 Max
(mm)		 D (mm) D1 (mm) C (mm) Weight
(kg)		 Lubricant
(kg)
JSD1 45 3,600 18–28 / 25, 28 / 30, 32, 35 35 47 45 102 97 86 3 2.9 0.027
JSD2 140 3,600 22–28 / 30–38 / 40, 42 41 47 45 106 94 – 3 3.9 0.041
JSD3 224 3,600 25–38 / 40–56 54 50 – 109 114 113 3 5.9 0.054
JSD4 400 3,600 32–38 / 40–56 / 60, 63, 65 60 60 56 – 135 125 3 8.98 0.068
JSD5 630 3,600 40–48 / 50, 55, 56 / 60–80 73 63 – 166 148 114 – 13.5 0.086
JSD6 900 3,600 48–56 / 60–75 / 80, 85 79 76 64 166 159 152 – 17.5 0.113
JSD7 1,800 3,600 55–75 / 80, 85, 90, 95 / – 88 89 93 204 190 178 3 28.6 0.172
JSD8 3,150 3,600 65–95 / 100, 110 / – 98 100 93 204 211 210 3 42.9 0.254
JSD9 5,600 2,440 80–95 / 100–125 / 130 120 90 103 205 251 251 5 70.8 0.426
JSD10 8,000 2,250 90, 95 / 100–125 / 130–150 127 104 106 205 270 276 5 95.7 0.508
JSD11 12,500 2,025 95–125 / 130–150 / 160, 170 150 120 125 205 308 319 6 139 0.735
JSD12 18,000 1,800 110–150 / 160–180 / 190 162 134 130 – 346 346 6 190 0.907
JSD13 25,000 1,650 120–200 152 184 135 – 384 359 – 259 1.13
JSD14 35,500 1,500 100–180 / 190, 200 / 240, 250 173 183 175 185 453 426 – 342.77 1.95
JSD15 50,000 1,350 110–125 / 130–220 / 240–280 186 198 180 205 501 457 – 434.48 2.81
JSD16 63,000 1,220 125 / 130–220 / 240, 250 / 280–320 220 216 194 224 566 527 10 641.96 3.49
JSD17 90,000 1,100 100–125 / 130–260 / 280–320 249 239 202 247 630 590 10 859.88 3.77
JSD18 125,000 1,050 110–150 / 160–250 / 280–320 / 340, 360 276 259 207 267 676 660 – 1,127.74 4.4
JSD19 160,000 900 110–150 / 160–180 / 190–320 / 340–380 305 279 224 289 757 711 – 12.4 5.63

Industry Applications

Thermal Power Stations

Coupling turbine output flanges to generator input shafts, or connecting boiler feed pump gearboxes to motor shafts, where one interface is flanged and the other is keyed.

Steel Rolling Mills

Linking flanged spindle couplings on rolling stands to keyed motor shafts, absorbing the severe torsional reversals inherent in hot and cold rolling processes.

Pulp & Paper Mills

Connecting gearbox flanges to paper machine drive shafts on press sections, dryer groups, and winder drives where precise torque control preserves sheet quality.

Water Infrastructure

Driving large vertical turbine pumps and axial flow pumps in flood control stations and irrigation networks where mixed flange/shaft interfaces are common in pump-motor assemblies.

GBC grid coupling product family - industrial serpentine spring couplings for JSD Single Flange applications

GBC grid coupling product range – engineered for reliability across all industrial sectors

Customer Feedback

★★★★★ – Coal-Fired Power Plant, USA

Industry: Power Generation  |  Application: Boiler Feed Pump Drive

“We installed JSD15 couplings between our 4,160V motor shafts and gearbox flanges on three 50,000 N·m boiler feed pump drives. The single flange saved us the cost of adapter flanges we previously needed with our old disc couplings. Vibration readings after commissioning were 40% below our alarm setpoints.”

– Vibration Analyst, Midwest Power Station

★★★★★ – Integrated Steel Works, Turkey

Industry: Steel Manufacturing  |  Application: Hot Strip Mill Drive

“Our hot strip mill finishing stands demand couplings that withstand 18,000 N·m with frequent torque reversals during cobble recovery. The JSD12 has performed flawlessly through over 8,000 rolling campaigns with no spring degradation, and the mixed flange-shaft design matched our existing drive train interfaces without modification.”

– Rolling Mill Superintendent, Iskenderun Works

★★★★☆ – Pulp Mill, Finland

Industry: Pulp & Paper  |  Application: Press Section Gearbox Coupling

“The JSD8 couplings on our press section gearbox-to-motor connections resolved a persistent vibration issue at 47 Hz that was causing accelerated bearing wear. The serpentine spring shifted the natural frequency sufficiently to avoid resonance. We recommend pre-ordering spare springs to minimize turnaround downtime during annual shutdowns.”

– Reliability Manager, Kymi Mill Complex

Frequently Asked Questions

Can the JSD flange end be oriented on either the driving or driven side?
Yes, the JSD coupling is bidirectional. The flange hub can be mounted on either the motor side or the driven equipment side, depending on which machine provides the flanged interface. Torque transmission performance is identical regardless of orientation.
What flange drilling standards does GBC support for the JSD series?
GBC machines JSD flanges to all major international standards including ISO 7005, ANSI B16.5, DIN EN 1092, and JIS B2220. Custom bolt circle diameters and non-standard hole patterns are also available. Submit your flange drawing for a precise quotation.
How do I specify different bore diameters for the flange side and shaft side?
When ordering, specify both bores separately: for example, JSD9 with flange bore d1 = 100 mm and shaft bore d = 110 mm. The two sides are independently machined, so any valid combination within the published bore ranges for each side can be accommodated.
Is the JSD coupling suitable for vertical shaft installations?
The JSD can be used in vertical configurations with appropriate modifications. The flange end must be the upper connection (supporting the coupling weight), and a retaining collar or set screw should be added to the lower shaft hub to prevent axial migration. Consult GBC engineering for vertical installation guidelines.
What is the expected service life of the serpentine spring in a JSD coupling?
Under normal operating conditions within rated torque and speed, the serpentine spring typically provides 3–5 years of reliable service. In clean, well-lubricated environments with moderate loads, spring life can exceed 8 years. Periodic inspection every 6–12 months and relubrication every 2,000–4,000 hours are recommended.

Order JSD Single Flange Grid Couplings From GBC

GBC delivers JSD single flange grid couplings with independent bore machining on flange and shaft sides, custom flange drilling to your specifications, and optional ISO 1940 dynamic balancing. Every unit ships with dimensional inspection reports and material certificates.

Request a JSD Quote
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Response within 24 hours  |  Custom bores available


The JSD Single Flange Grid Coupling features one flanged hub and one keyed shaft hub, bridging flange-connected and shaft-mounted equipment. With 19 sizes from 45 to 160,000 N·m, it provides the flexibility needed for mixed-interface drive trains in power generation, steel production, and heavy process machinery.

Contact Us

Email

sales@australia-drive.com

stuart_hamill@generalbearing.com.au

Tel: +61 3 9070 7991

SKU: d125c30c377a Categories: , Tags: , , , ,

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