Inline nutrunners with quick action chuck by Cleco

Cleco Straight Rotary Screwdrivers (Series 19SPA and 19SCA) with Quick-Change Chuck

Straight rotary screwdrivers from Cleco's 19SPA and 19SCA series are aimed at industrial users who require repeatable, high-performance pneumatic tools for assembly and maintenance processes. These devices are designed as straight screwdrivers, feature a quick-change chuck, and are engineered for consistent torque transfer, long service life, and easy maintenance. Typical applications include series assembly in the electronics and automotive supplier industries, production lines in metal processing, and service and maintenance work in the manufacturing industry.

Construction, Materials, and Designs

The housing of the 19SPA and 19SCA series consists predominantly of an aluminum alloy with corrosion-resistant surface coatings. Internal components such as shafts and bearings are made of hardened steel, specifically heat-treated and ground to minimize wear. The designs are configured as straight screwdrivers to ensure accessibility in confined assembly areas. Different length variants allow adaptation to vertically or horizontally restricted installation situations. The quick-change chuck is available in a hardened version; precise tolerances achieve minimized play between the bit holder and the screw.

Connections, Air Supply, and Sealing Technology

Typical connection sizes are 1/4" and 3/8" NPT or BSP, depending on the regional version. For compressed air supply, the screwdrivers are designed for operating pressures between 4.5 and 6.3 bar. Integral air filters, pressure regulators, and silencers are prerequisites for reproducible performance data; the use of fine filter-oiler combinations in the supply line is recommended. Internal seals are made of nitrile or fluororubber (NBR/FKM) depending on temperature and oil resistance; this makes the tools compatible with mineral oils and many synthetic lubricants. A moisture-sensitive environment requires additional condensate separators in the compressed air line to prevent cavitation and internal corrosion.

Performance, Control Behavior, and Adjustment Options

The 19SPA and 19SCA series offer differentiated performance characteristics: The 19SPA models target high speeds at medium to low torques, while the 19SCA models are optimized for high torque requirements and slower, high-torque applications. Torque control is achieved mechanically via internal clutch or electromagnetic shut-off mechanisms in the control unit. Reproducibility is ensured by finely adjustable clutches; the tools typically offer a maximum repeatability within the adjustable range of ±3–5%. Idle speeds vary between 2000 and 8000 min−1 depending on the model; the maximum tightening torque ranges from a few Nm up to double-digit Nm values, suitable for self-tapping screws, countersunk screws, and metric screw connections.

Quick-Change Chuck: Mechanics and Advantages

The quick-change chuck significantly reduces setup times in production. Mechanically, it is based on a locking system that axially engages bits and secures them laterally. Advantages include quick, tool-free bit changes, low scrap risk due to slip-free bit reception, and reduced operator errors. Magnetized or clampable variants are available for special demands. The chuck is compatible with 1/4" hex bits according to ISO 1173 and common Torx and Pozidriv fittings. A crucial aspect is the precision of centering: the lower the runout, the lower the stress on the screw head and bit tip, which increases the service life of both components.

Ergonomics, Noise, and Vibration Management

The straight design reduces leverage during prolonged assembly cycles. Grip surfaces are tactilely designed and offer an oil- and dirt-resistant surface, ensuring grip security even with dirt and oil. Noise-reducing measures such as internal silencers and optimized air outlet channels reduce noise levels; this is important for control room specifications and occupational safety. Vibration-damping bearings in the grip area minimize hand-arm vibrations and increase process stability in repetitive applications.

Maintenance, Spare Parts, and Lifetime Criteria

Maintenance intervals are based on operating hours and the operating environment. Regular shaft lubrication, replacement of seals and silencers, and bearing inspection are standard measures. The modular design of the 19SPA/19SCA allows for the replacement of gearbox assemblies and quick-change chucks without a complete tool replacement. Spare parts include seal kits, ball bearings, valve bodies, and quick-change chuck inserts. A documented maintenance routine significantly extends the service life and ensures constant torque values.

Application Technology: Materials, Screw Connections, and Process Integration

When selecting the workpiece material, the combination of screw, workpiece material, and preload force determines the torque dosage. For softer materials such as aluminum or plastics, torque and tightening speed must be reduced to avoid engagement and overload damage. When using locking agents (Loctite, etc.), the tightening procedure must be adjusted, as viscosity affects the screwing behavior. In automated lines, Cleco straight screwdrivers can be coupled with feeding systems for bits and screws; common interfaces include pneumatic pick-and-place units and electrical controls with OK/NOK signal outputs to the line control.

Practical Examples

Example 1 — Assembly of Electrical Control Panel: In series production, sheet metal housings are fastened with M4 countersunk screws. Application: 19SPA with quick-change chuck, set tightening torque 3.5 Nm, reduced idle profile for clean transition into tightening torque. Result: constant preload, reduced rework due to damaged screw heads.

Example 2 — Assembly in Confined Bodywork Areas: For vehicle interior trim with hard-to-reach fastening points, a short 19SCA model with an extended shaft and quick-change chuck is used. Application: slow tightening with high torque for M6 fasteners; filtered air supply with additional dryer. Result: reproducible assembly without damaging plastic clips.

Example 3 — Maintenance of Production Facilities: Replacement of screw connections on steel frames: 19SCA with robust chuck, set clutch shut-off at higher Nm. Used in dirty conditions with reinforced seals and frequent maintenance. Result: reduced downtime thanks to quick bit changes and easy on-site repair. Further application cases can be found at Application Examples and technical details at Technology.

Compatibility and Accessories

The tools are compatible with standard 1/4" hex bits; additional accessories include extensions, angle attachments, magnetic adapters, and custom bit holders. For automated assembly, adapter plates and pneumatic connections are offered, enabling integration into linear axes and robot cells. For special environments, variants with reinforced sealing and chemical-resistant sealing materials are available.

Selection criteria include: required torque range, accessibility of the screw location, desired bit change time, environmental conditions (dirt, moisture, temperature), and the need for process monitoring in the production line.

• Important components: Housing (aluminum alloy), shaft (hardened steel), bearings (ball bearings), seals (NBR/FKM), quick-change chuck (hardened, 1/4" compatible)

Process-Technical Integration and Quality Control

For industrial line integration, feedback on tightening cycles, cycle counters, and OK/NOK signals are necessary. Cleco screwdrivers can be coupled with torque monitoring modules or placed in measuring stations on the line. Inspection intervals should be defined according to batch size and criticality of the connection; sample inspections and statistical process controls (SPC) improve product quality and reduce complaints.

Selecting Specific Specifications

When ordering, specify the model (19SPA vs. 19SCA), drive connection, desired torque range, idle speed, length, type of quick-change chuck, and necessary accessories such as filters/regulators/oilers. Pay attention to availability and, if applicable, customized modifications for special applications.

FAQs

1. What is the difference between Cleco 19SPA and 19SCA?
The 19SPA models are optimized for high speeds at moderate torque, while the 19SCA models are designed for higher torque requirements and slower, more powerful tightening. Selection depends on the required preload force and cycle time.

2. What air preparation is required?
A regulated compressed air element with fine filter, pressure regulator, and oiler is recommended, operating safely at 4.5–6.3 bar. Condensate separators and dryers are mandatory in humid environments; plan filter replacement intervals according to operating hours.

3. How quickly can the quick-change chuck be changed, and how does it affect process stability?
Bit changes with the quick-change chuck are tool-free and take seconds, significantly reducing setup times. Precise centering and hardened chuck jaws keep runout low, increasing process stability and the service life of both bit and screw.