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Cleco Series 19, 24, and 34 Angle Nutrunners – Technical Overview and Practical Application

**Angle nutrunners** from Cleco's 19RAA, 24RAA, and 34RAA series are designed for industrial fastening requirements where compact design, precise torque control, and high durability are essential. These tools combine durable pneumatic drives with optimized angle gear design to enable access in confined spaces while ensuring repeatable fastenings. Unlike standard straight nutrunners, angle versions offer a significantly smaller head diameter and ergonomic power transmission, reducing strain on the torso and hands.

Construction and Materials

The housing and gear head of Cleco tools are typically made from hardened die-cast aluminum or a steel alloy to achieve an optimal weight-to-strength ratio. Internal gear teeth are made of hardened steel with precision-ground tooth profiles to minimize backlash and prevent torque loss. Shafts and bearings use hardened chrome steel materials, often with surface coatings for corrosion resistance. In the 19RAA, 24RAA, and 34RAA series, seals and O-rings are made from nitrile or fluorine-containing elastomers (NBR, FKM), depending on compressed air quality and ambient temperature, to ensure oil resistance and longevity. Some models offer optional **ATEX-compliant** versions or special coatings for corrosive environments.

Drive and Gear Technology

The pneumatic motors in Cleco angle nutrunners operate with compressed air-regulated speed ranges, typically between 1,000 and 10,000 rpm, depending on the model and gear ratio. The angle gear transmits motor power to the fastener interface; gear ratios are designed to allow for both high idle speeds and precise, high-torque working ranges. The series numbers 19, 24, and 34 correspond to different power and size classes: the 19RAA targets compact applications with limited space, the 24RAA represents a medium power range, and the 34RAA is designed for higher torque requirements. Integrated slip clutches or click mechanisms are available in some variants to prevent tool and fastener damage when preset torque values are exceeded.

Connections, Air Supply, and Maintenance

Cleco angle nutrunners use standardized quick couplings (1/4" or 3/8" NPT/ISO variants) for compressed air supply. Correct air preparation is crucial: a filter-regulator-lubricator combination is required to reliably remove particles, water, and excess moisture, and to ensure defined lubrication. Recommended operating pressure is usually between 4.5 and 6.2 bar; deviations affect performance characteristics and wear. Maintenance intervals include regular re-oiling, checking O-rings, replacing worn bearings, and inspecting gear housing screw connections. Symptoms such as power loss, unusual vibrations, or air ingress into the gearbox indicate seal or bearing problems and should be addressed immediately to prevent consequential damage.

Seals, Lubrication, and Service Life Optimization

Sealing materials are chosen according to the operating environment and lubricants used. Nitrile rubber (NBR) offers a good balance for general compressed air environments; FKM is advantageous at higher temperatures and with more aggressive media. Proper lubrication reduces friction in bearings and gears and significantly extends service life. Cleco recommends finely dosed oiling via inline oilers, supplemented by periodic internal cleaning and lubricant replacement after defined operating hours. Spare parts kits for seals, bearings, and gear components are available, enabling planned maintenance.

Fields of Application and Suitability

Angle nutrunners from the 19RAA, 24RAA, and 34RAA series are designed for production lines in aerospace, automotive manufacturing, mechanical engineering, assembly areas, and for maintenance in manufacturing. Their compact geometry allows fastening in hard-to-reach areas of gearboxes, housings, or pipelines. The robust gear design permits use in continuous high-volume workplaces, while sensitive variants are used for final assemblies with controlled torque.

Practical Examples

**Example 1 – Assembly of Gearbox Housings:** In a production line, 24RAA angle nutrunners are used to fasten bolts inside the gearbox housing. The angled design allows screws to be started deep within the housing, and the integrated torque limitation ensures repeatability. Air preparation at 5 bar, inline oiling every 8 hours, and weekly inspection of O-rings prevent air ingress and increase service life. **Example 2 – Final Assembly in Body Construction:** For fastening seat consoles, 19RAA models are used because their compact head access enables assembly in confined channels. The tool operates at low speed and with precise run-down to avoid exceeding pre-tensioning forces. By using a click clutch, the specified tightening torque per screw is reliably maintained, eliminating rework. **Example 3 – Maintenance of a Production Plant:** During maintenance inspections, high-torque 34RAA angle nutrunners are used to loosen corroded screw connections on pump-side flanges. The robust construction and heat-resistant seals ensure that functionality is maintained in the short term despite oil and water contamination. After maintenance, wear parts are replaced, and the tool is returned to series operation.

Integration into Manufacturing Processes and Automation

Cleco angle nutrunners can be integrated into semi-automated and fully automated assembly stations. Interfaces to torque control systems enable data acquisition per fastening for quality assurance and traceability. Electronic or pneumatic controls can specify start/stop parameters, torque profiles, and cycle times. Adaptable flanges and quick-change systems are available for linear or rotary handling systems, as are various bit holders (1/4" hex, 3/8" square) to cover different screw sizes.

Selection Criteria

When choosing between 19RAA, 24RAA, and 34RAA, the primary decision is the required torque, followed by installation space, weight, and desired speed. Furthermore, air consumption and the existing compressed air infrastructure must be considered. Technologies such as torque limitation, non-reversing clutches, or vibration-damped handles influence productivity and ergonomics. Plan for maintenance intervals and spare parts stocking to minimize downtime. Further technical information on pneumatic components, air preparation, and application examples can be found at [maku-industrie.de/technik](https://maku-industrie.de/technik) and specific industrial use cases at [maku-industrie.de/anwendungsbeispiele](https://maku-industrie.de/anwendungsbeispiele).

Technical Specifications (typical values)

* Idle speed: 1,000–10,000 rpm; Operating pressure: 4.5–6.2 bar; Torque range: model-dependent (low to high); Air connection: 1/4" or 3/8" NPT/ISO; Sealing materials: NBR/FKM; Housing material: Die-cast aluminum/steel; Lubrication: Inline oiler recommended.

FAQs

**1. Which series is best suited for tight installation spaces?** For particularly tight areas, the 19RAA series is suitable due to its more compact head diameter and low weight. The 24RAA series offers a compromise between accessibility and performance; the 34RAA is less designed for very tight installations but for higher torques. **2. Which maintenance measures are most effective in extending service life?** Regular air preparation, dosed inline oiling, periodic replacement of O-rings and bearings, and immediate repair in case of performance loss are crucial. Implement a documented maintenance plan with defined operating hour intervals and stock wear kits. **3. How do I ensure compatibility with my compressed air system?** Check connection sizes, permissible operating pressure, and air volume flow (l/min). Install a filter-regulator-lubricator with an adjustable pressure range and measure pressure fluctuations under load. Pay attention to the water separator and particle filter to avoid seal damage.