Cleco 55RNL-3T-4 Pneumatic Stall Collar Reverse Angle Nutrunner | 55 Series | Lever Start | 195 RPM | 100 (ft-lbs) Max Torque

When assembly work requires higher torque at a controlled rundown speed, the Cleco 55RNL-3T-4 pneumatic stall collar reverse angle nutrunner gives production teams a compact right-angle fastening tool for bolts, nuts, and socket-driven assembly work. As part of the 55 Series, this lever-start model delivers 195 RPM free speed for measured rundown and up to 100 ft-lbs / 136 Nm max torque, making it useful for medium-to-high torque joints where controlled fastening is more important than impact-style breakaway power.

The stall drive system (a pneumatic torque-control method where the motor stops as joint resistance reaches the tool’s output) keeps the tool straightforward to set up when air pressure and joint conditions are properly verified. A 1/2" square drive accepts compatible sockets, while the collar reverse design lets the operator back out fasteners, reposition parts, or perform rework without changing tools. The angle head helps reach fasteners around fixtures, brackets, housings, and frame members where inline tools may not fit cleanly.

Type: Pneumatic Stall Collar Reverse Angle Nutrunner | Series: 55 Series | Start Type: Lever Start | Drive Size: 1/2" Square Drive | Max Torque: 100 ft-lbs / 136 Nm | Free Speed: 195 RPM | Length: 16.8" / 425 mm | Weight: 6.5 lbs / 2.95 kg | Head Height: 1.63" / 41.28 mm | Side to Center: 0.72" / 18 mm | Air Consumption: 55 SCFM / 26 L/sec | Air Inlet: 1/2" NPT | Min. Hose I.D.: 1/2"

Features:

• Stall-type fastening provides simple pneumatic torque control for production assembly applications.
• Collar reverse operation allows the tool to be reversed when required for fastener removal, alignment correction, or rework.
• 195 RPM free speed supports controlled rundown on higher-torque fastening jobs.
• Angle head configuration improves access around frames, brackets, panels, and production fixtures.
• Heavy duty Cleco motor, gearing, and angle head construction support regular use in assembly environments.
• Torque can be adjusted by adjusting air pressure, allowing setup to be matched to the joint when properly tested.
• Planetary gears support tool speed changes with minimal parts service and replacement.

Made in USA:

Applications:

• Heavy equipment and machinery assembly — tightening bolts on frames, brackets, covers, guards, and mounted components.
• Automotive and truck production — fastening medium-to-high torque joints where right-angle access improves reach.
• Industrial MRO and plant maintenance — removing and reinstalling socket-driven fasteners during equipment repair or line changeover.
• Agricultural and off-road equipment manufacturing — controlled fastening on assemblies with obstructed or recessed fastener locations.
• Production tool cribs — standardizing pneumatic angle nutrunners for stations that require reversible operation and verified torque setup.

FAQs:

• Q: What does “stall” mean on this Cleco nutrunner?
  A: Stall means the motor stops as resistance in the joint reaches the tool’s torque output. It is commonly used for pneumatic assembly work where torque is controlled through air pressure, joint consistency, and verification testing.
• Q: Is the 55RNL-3T-4 reversible?
  A: Yes. The collar reverse design allows the operator to reverse the tool when needed, which helps with fastener removal, repositioning, and rework during assembly.
• Q: What sockets fit this nutrunner?
  A: This model uses a 1/2" square drive, so it should be paired with compatible 1/2" drive sockets rated for the application. Socket size and style should match the fastener and clearance requirements of the joint.
• Q: How is this different from an impact wrench?
  A: This is a nutrunner for controlled assembly fastening, not a hammering impact tool for breaking loose seized hardware. Use it when repeatable rundown and torque setup matter; use an impact wrench for high breakaway removal work.
• Q: Should final torque be checked after setup?
  A: Yes. Air pressure, joint type, lubrication, and fastener condition all affect torque output, so the final assembly process should be verified with an approved torque audit method before production use.

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Need help selecting the correct Cleco Pneumatic Nutrunners for your application? Please call (800) 608-5210 or email info@intlairtool.com