Description
JQ-30 JQ Type Clamping Coupling – 30mm Split-Body Reactor Stirring Shaft Connection
The JQ-30 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-30 is sized for 30 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-30 |
| Type | JQ Type Clamping Coupling (Split-Body) |
| Bore Diameter (dg H7) | 30 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-30’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
- Split stirring shaft connections on tall reactor vessels where single-piece shaft handling is impractical
- Industrial mixing equipment — emulsification, dispersion, and dissolution reactors in chemical production
- Effluent treatment agitators — wastewater and sludge mixing drives requiring field-assembled shaft connections
- Food processing mixers — dairy, beverage, and condiment batch mixing vessel drives
Customer Reviews and Case Studies
★★★★★
France — Petrochemical Plant
Installed on vertical agitator drives in our chemical mixing vessels. The JQ-30 split clamp allows shaft removal during vessel maintenance without disturbing the bearing housing. Excellent dimensional fit on our 30 mm shafts.
— Process Engineer, Lyon
★★★★★
Brazil — Fertiliser Production
We use the JQ-30 on reactor stirring shaft connections in our ammonia-based fertiliser plant. The coupling’s clamp halves make shaft assembly faster than traditional keyways — our maintenance team saves approximately 2 hours per shaft replacement.
— Maintenance Supervisor, São Paulo
★★★★☆
Poland — Industrial Mixing Equipment
Fitted on an emulsification reactor agitator drive. The clamp coupling preserved the shaft surface — important in our application where shaft reuse over multiple coupling replacements is standard practice.
— Design Engineer, Warsaw
Frequently Asked Questions
What material is the JQ clamping coupling body made from?
The JQ coupling body is manufactured from cast iron or cast steel depending on the model size and torque rating. For special material requirements — stainless steel, higher-grade alloy steel — please specify when placing an enquiry.
What is the significance of the L0 dimension in the JQ coupling?
L0 is the overall body length of the coupling. When designing the reactor shaft layout, L0 must be accounted for in the shaft gap calculation between the two shaft sections. The shaft sections should be positioned so the gap between their ends falls within the central section of the coupling body.
Is the JQ coupling suitable for use in ATEX-classified zones?
The JQ coupling is a metallic mechanical component with no electrical components and low spark risk from mechanical contact. Many installations in ATEX Zone 1 and Zone 2 environments use JQ couplings. Confirm the overall ATEX classification requirements for your installation with your safety engineer and explosion protection certification body.
What is the maximum bore diameter available for this model?
Each JQ model has a specified bore range. The standard bore sizes within this range are detailed in the dimension table. For bore sizes outside the standard range, or for non-standard shaft diameters, contact Ever Power to discuss custom bore machining options.
How often should the JQ coupling clamping bolts be inspected?
Clamping bolt torque should be verified at the first scheduled maintenance after initial installation to confirm no relaxation has occurred during the initial running-in period. Subsequently, bolt torque inspection at planned maintenance intervals (typically annual) is sufficient for most applications. For high-vibration environments, more frequent checks are recommended.
Source the JQ-30 JQ Clamping Coupling
Ever Power manufactures the JQ-30 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.
