Atlas Copco Tensor STR61‑70‑13 Angle Wrench (8436 6160 70)

The Atlas Copco Tensor STR61‑70‑13, also referenced as 8436 6160 70, is a high‑performance electric angle wrench engineered for precision fastening in confined spaces. Part of the Tensor ETV series, this tool combines a compact 90‑degree head with advanced torque and angle control, making it ideal for applications where straight‑line access is limited. Its robust build and intelligent electronics ensure consistent joint integrity in automotive, heavy equipment, and general assembly operations.

Design and Ergonomics

The angle wrench features a slim profile and a low‑profile gear head, allowing operators to reach fasteners in tight engine bays, chassis frames, and machinery interiors. The housing is constructed from impact‑resistant composite materials with a soft‑grip overmold to reduce vibration and user fatigue. A built‑in LED work light illuminates the fastening area, improving accuracy in dim environments. The tool weighs approximately 2.5 kg and is balanced for one‑handed operation.

Control and Precision

Equipped with a brushless DC motor and a high‑resolution angle encoder, the STR61‑70‑13 delivers torque from 5 to 70 N·m with an accuracy of ±2.5% of the set value. The angle measurement resolution is 0.1°, enabling sophisticated tightening strategies such as torque‑control, angle‑control, and yield detection. The tool also supports multi‑step programs, allowing operators to define snug, final, and re‑tightening stages within a single cycle.

Technical Specifications

• Torque Range: 5 – 70 N·m (adjustable)

• Free Speed: 130 rpm (nominal)

• Drive Size: 1/2″ square or 3/8″ (depending on configuration)

• Angle Head Offset: 13 mm (low profile)

• Voltage: 36 VDC (powered via controller)

• Weight: 2.5 kg

• Noise Level: < 75 dB(A)

• Vibration: < 2.5 m/s²

• Operating Temperature: 0 °C to +45 °C

Integration with Controllers

The angle wrench is fully compatible with Atlas Copco Power Focus and Tensor controllers (PF3000, PF4000, TC‑4000 series). It communicates via a dedicated cable using CAN‑bus protocol, enabling real‑time data exchange for torque, angle, and tool status. The controller can store multiple tightening programs and download them to the tool, allowing rapid changeovers. Firmware updates are performed via the controller’s software suite.

Safety and Quality Assurance

The tool incorporates a dual‑safety shutdown feature: if the torque or angle exceeds preset limits, the motor stops instantly and an error signal is sent to the controller. A built‑in temperature sensor prevents overheating during prolonged use. Every tightening cycle is logged with a unique timestamp and can be traced back to the operator and workpiece via barcode integration, ensuring full compliance with ISO 5393 and VDI/VDE 2645 standards.

Applications

Typical applications include automotive engine block assembly (cylinder head bolts, bearing caps), chassis suspension bolting, electrical cabinet assembly, and general machinery fastening where clearance is restricted. The angle head is particularly useful for securing bolts in corners and along frame rails. It is also used in aerospace for structural fastener installation.

Maintenance and Service

Routine maintenance includes lubrication of the angle gear every 500 operating hours, using Atlas Copco approved grease. The brushless motor requires no brush replacement, reducing downtime. The tool’s housing can be wiped clean with mild solvents. A comprehensive diagnostic routine, accessible via the controller, checks motor current, encoder health, and thermal performance.

Benefits for Production

By providing accurate torque and angle in a compact format, the Tensor STR61‑70‑13 reduces rework and scrap. Its quick‑change tool holders and standardized interface minimize setup time. The integration with plant network enables real‑time monitoring and predictive maintenance, leading to higher overall equipment effectiveness.

Conclusion

The Atlas Copco Tensor STR61‑70‑13 angle wrench is a reliable, precise, and ergonomic solution for demanding fastening tasks in tight spaces. Its advanced electronics, robust mechanics, and seamless controller integration make it a valuable addition to any professional assembly operation.