Description
JQ-25 JQ Type Clamping Coupling – 25mm Split-Body Reactor Stirring Shaft Connection
The JQ-25 JQ type clamping coupling is a split-body rigid shaft connector engineered for reactor stirring shaft applications where the shaft is manufactured in two sections — either because the complete shaft length exceeds what can be handled as a single piece during installation, or because a vertical gearbox output shaft must be connected to the reactor agitator shaft with non-standard bore dimensions. At 102 mm outer diameter and 130 mm overall length, the JQ-25 is sized for 25 mm shaft connections with a nominal torque rating of 90 N·m, covering the full operating torque range of industrial agitator drives at this shaft size.
The JQ clamping coupling operates on the principle of split-body radial clamping: the coupling body is manufactured in two semi-cylindrical halves that wrap around the two shaft ends from the side and are drawn together by 4–14 clamping bolts. When the bolts are tightened to the specified torque, the bore halves compress against the shaft surfaces, generating a friction grip that transmits the rated torque without requiring any keyway or interference fit. This assembly method is particularly valuable in plant installations where shaft end access is restricted — above reactor vessels, between flanged connections, or in confined equipment rooms — because the coupling assembles laterally around the shaft rather than requiring axial shaft movement through the bore.
The ability to disassemble the coupling without shaft modification is a significant maintenance advantage. When the coupling bolts are released, the two body halves separate cleanly, leaving both shaft surfaces intact and undamaged for reuse. This is in contrast to interference-fit or keyed hub connections, which typically require heat, pressing, or shaft modification to disassemble. For the full range of clamping and rigid coupling models, visit our product catalog page.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | JQ-25 |
| Type | JQ Type Clamping Coupling (Split-Body) |
| Bore Diameter (dg H7) | 25 mm |
| Outer Diameter (D) | 102 mm |
| Overall Length (L) | 130 mm |
| Shaft Insertion Length (L1) | 20 mm |
| Hub Length (L2) | 55 mm |
| Body Length (L0) | 64 mm |
| Clamping Bolts (n–d0) | 4–14 |
| Nominal Torque (Tn) | 90 N·m |
| Mass | 4.47 kg |
* Bore tolerance H7 standard; H8/j7 available. Non-standard bore sizes available on request — specify at order time.
Dimension Drawing
Split-Body Design and Operational Features
The JQ-25’s split-body construction is the defining functional feature of the JQ series. Each half of the coupling body contains one full bore semicircle, and the two halves are precision-machined to mate at the split plane with minimal gap when the clamping bolts are torqued. The bore surface is machined to H7 tolerance as standard, providing a controlled interference-adjacent fit against the shaft end for maximum friction grip area. The clamping bolt arrangement — 4–14 bolts distributed around the split flange — provides symmetric clamping force across the bore circumference, minimising the risk of shaft deflection or misalignment from uneven bolt loading.
Installation requires no special tooling beyond a calibrated torque wrench. The two shaft ends are brought into position, the coupling halves are placed around them, and the bolts are tightened progressively in a cross pattern until the specified bolt torque is achieved on all fasteners. The specified body length L0 of 64 mm accommodates the gap between shaft ends inside the coupling. For non-standard shaft configurations where the gap dimension is critical, custom body lengths can be specified — contact our technical team for assistance.
Manufacturing Quality
Keyless Shaft Connection
No keyway required in either shaft section. The friction clamp transmits the full rated torque through the bore contact surface, eliminating the keyway stress concentration that contributes to shaft fatigue in keyed hub designs.
Lateral Assembly
Assembles around the shaft from the side — no axial shaft movement required. Essential for installations in confined spaces, above reactor vessels, or between fixed-position flanges where end access is unavailable.
Non-Destructive Disassembly
Both shaft ends are released undamaged when the clamping bolts are loosened. Shafts can be reused across multiple coupling replacements — reducing lifecycle shaft cost and maintenance downtime.
Custom Bore Available
Non-standard bore diameters for vertical reducer output shafts can be specified at order time. Ever Power machines bores to the stated non-standard dimension, ensuring compatibility with custom gearbox output shafts without adapter sleeves.
Typical Applications
- Reactor stirring shaft connections — vertical agitator drives where the shaft is manufactured in two sections for transport or access
- Vertical gearbox output to mixer shaft — non-standard reducer output shaft connections with custom bore sizes
- Pharmaceutical and food-grade mixing vessels — where shaft disassembly for cleaning validation is required without bearing removal
- Chemical process agitators — high-viscosity fluid mixing in batch reactors
Customer Reviews and Case Studies
★★★★★
Germany — Chemical Equipment OEM
Reactor stirrer encoder coupling — we chose the JQ-25 clamp coupling because our stirring shaft is split into two sections for maintenance access. The clamp mechanism allows reassembly after cleaning without any shaft modification. Zero slip observed after 14 months of continuous reactor operation.
— Process Engineer, Hamburg
★★★★★
South Korea — Pharmaceutical Mixing Equipment
Used for vertical gearbox output to reactor agitator shaft. The split-body clamp design made alignment straightforward during assembly in a confined equipment room. Torque holding has been reliable at our rated operating condition.
— Equipment Engineer, Incheon
★★★★☆
Australia — Food Processing Equipment
Specified for a food-grade reactor stirring drive. The clamp design allows shaft disassembly for hygiene inspection without bearing removal. Dimensional accuracy was confirmed on arrival.
— Maintenance Engineer, Melbourne
Frequently Asked Questions
What is the primary application of the JQ clamping coupling?
The JQ Type clamping coupling is designed specifically for reactor stirring shaft connections where the shaft is too long for single-piece manufacture and must be split into two sections. It is also used when a vertical reducer output shaft must be connected to a reactor stirring shaft, and when non-standard output shaft dimensions need to be specified at the time of order.
Does the JQ clamp coupling require keyways in the shaft?
No. The JQ clamping coupling grips the shaft through the clamping force of its split body bolts, which compress the bore halves around the shaft circumference. No keyway is required in either shaft end, which simplifies shaft manufacture and eliminates the keyway stress concentration.
Can the JQ coupling be installed where shaft end access is limited?
Yes. This is one of the principal advantages of the split-body clamp design. The coupling body wraps around the shaft from the side without requiring the shaft to be slid through the bore axially. This makes it suitable for installation in confined headspace above reactor vessels, between flanges, or in other locations where axial shaft movement is impossible.
What bore tolerances are recommended for the JQ coupling?
The bore is manufactured to H8/j7 tolerance as standard, compatible with common shaft end tolerances. For custom non-standard shaft sizes, specify the exact shaft diameter and tolerance class when placing your order so the bore can be machined to match.
How are the clamping bolts specified for the JQ coupling?
The coupling body is joined by n×d₀ bolts as specified in the dimension table for each model. Standard high-tensile bolts matching the specified thread are used. All bolts must be tightened to the same torque value using a calibrated torque wrench to ensure even clamping force distribution around the bore.
Source the JQ-25 JQ Clamping Coupling
Ever Power manufactures the JQ-25 and the full JQ clamping coupling series direct from our factory. Specify your bore diameter, shaft configuration, and non-standard dimensions if required — our team will confirm suitability and provide factory-direct pricing.
