When it comes to rigging flight control systems, using the proper tools and techniques is critical to safety and FAA compliance. In this post, we walk you through how to use the ATI520JK AT520JK swaging tool—manufactured by Snap-on / ATI Tools—to swage MS21260 eye terminals and MS21266 fork terminals onto aircraft-grade stainless steel cable.
This tool is widely used across general aviation, commercial, and military maintenance operations for making permanent, airworthy control cable assemblies.
🔧 Tools & Parts Featured in the Demonstration
Swaging Tool: ATI520JK AT520J
Cable: Aircraft-grade stainless steel wire rope (7x7 or 7x19 construction)
Terminals:
MS21260 (Eye Terminal) MS21266 (Fork Terminal)
Inspection Gauge: Go/No-Go gauge for post-swage verification
✅ Step-by-Step Instructions for Proper Swaging
1. Prepare the Cable
Cut the wire rope cleanly using a certified aircraft cable cutter. Ensure the end is not frayed or mushroomed.
2. Insert the Terminal
Slide the MS21260 or MS21266 terminal onto the cable. Ensure the cable is fully seated inside the terminal barrel. Mark the cable to confirm full insertion.
3. Load the Tool
Open the jaws of the ATI520JK AT520J swaging tool and insert the terminal into the correct die cavity. Each swage size is engraved on the tool for easy selection.
4. Swage in Stages
Begin compressing the terminal by squeezing the handles. Move along the length of the fitting in 3–4 staged compressions to ensure full and even swaging.
5. Inspect the Swage
Use a calibrated Go/No-Go gauge to inspect the swaged terminal. The fitting should pass through the “Go” side but not the “No-Go” side, confirming proper compression diameter.
🛠 Why Use the ATI520JK AT520J?
Approved for swaging terminals that meet NAS and MIL specs
Compatible with popular terminal types including MS21260, MS21266, MS20668
Manual operation—perfect for field or hangar use
Used by A&P mechanics, MRO facilities, and OEMs worldwide
⚠️ Safety & Compliance Tips
Always follow ATI Chapter 20 and FAA AC 43.13-1B guidelines when rigging or terminating aircraft cable
Swaged fittings must be visually inspected and gauge-verified before flight
Replace any worn, overused, or uncalibrated tooling
🛒 Where to Buy Top Flight Tools offers:
New and used ATI520JK AT520J swaging tools
FAA-approved MS21260 and MS21266 terminals
Inspection gauges
Calibration and re-certification services
Need help identifying your tool or finding the right replacement parts? Contact us today—we’re happy to help.
⚠️ Disclaimer Top Flight Tools (TFT) is an independent reseller and is not affiliated with, sponsored by, or endorsed by Snap-on®, ATI Tools®, or any Snap-on Incorporated subsidiaries. All product names, trademarks, and registered trademarks are the property of their respective owners. Any reference to ATI Tools® products, specifications, or part numbers is provided solely for informational purposes. All Snap-on® and ATI Tools® trademarks, brand names, and part numbers remain the property of their respective companies. TFT makes no claim of affiliation and assumes no responsibility for the misuse of this information or any misrepresentation of association with the original manufacturer.