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Wescon heavy-duty, long-travel microstop cages are engineered specifically for Taper-Lok drill-reamers. Built to handle continuous high-thrust loads and deep-hole drilling, these cages provide the stroke length and rigid depth control required for interference fit fastener installation.
| Wescon Model | Shaft Thread | Shaft Travel | Taper-Lok Cutter Capacity | Cross-Ref | NSN Cross-Ref |
|---|---|---|---|---|---|
| WES596-ES-750-TL | 1/4"-28 | 3/4" | 1/8" & 5/32" Standard | TLA4900-12 | N/A |
| WES596-ES-1500-TL | 1/4"-28 | 1-1/2" | 3/16" Standard | TLA4900-24 | 5133-00-838-2500 |
| WES696-ES-2375-TL | 7/16"-20 | 2-3/8" | Large Diameter Standard | TLA4900-38 | 5133-00-838-2503 |
Off-the-shelf tooling cannot accommodate every complex airframe geometry or proprietary drill template. Wescon specializes in the rapid engineering and manufacturing of custom Taper-Lok microstop cages designed specifically for tight-clearance applications and custom jig integrations.
Whether you need a modified skirt footprint to clear an adjacent stringer or a specialized nose to mate perfectly with a custom drill jig, our in-house machining division can build to your print or reverse-engineer a solution.

TAPER LOK MICROSTOP UNIT
| Part Number | Cutter Thread | Cutter Capacity | Shaft Diameter | Shaft Style | Price | Lead Time |
|---|---|---|---|---|---|---|
| WES596-ES-1500-TL | 1/4-28 | 3/4 in | Tri-Flat | $1,200.00 | Ships Next Business Day | |
| WES596-ES-750-TL | 1/4-28 | 3/4 in | Tri-Flat | $1,100.00 | Ships in 8 Weeks | |
| WES696-ES-2375-TL | 7/16-20 | 1 in | 3/8" Tri-Flat | $1,300.00 | Ships in 8 Weeks |
Looking for equivalent parts from other manufacturers?
Cross Reference SearchWescon USA’s precision microstops (countersink cages) are engineered to deliver absolute, repeatable depth control for critical airframe assembly.
Manufactured 100% in the USA using the highest quality aircraft-grade workmanship and materials, our microstops are built for high-cycle OEM and MRO environments. Capable of speeds up to 10,000 RPM, they feature dual ball bearings and heavy-duty thrust bearings to eliminate runout and vibration. With ultra-precise micro-adjustments in increments of 0.0005 inches, tooling engineers can dial in exact tolerances for any advanced composite or traditional alloy. To seamlessly integrate into global manufacturing lines, our entire catalog is available in both Imperial (e.g., 1/4-28) and Metric (e.g., M6x1, M8x1) cutter threads.
Proper surface contact is vital during hole preparation. We offer multiple foot piece options tailored to your specific application. Choose non-marring Nylon or Phenolic or Steel foot pieces to protect delicate aircraft skins, cladding, and composite panels from scoring, in high-friction, heavy-duty production environments.
Beyond our extensive standard catalog, Wescon USA provides direct-to-manufacturer engineering solutions. If your assembly line requires extended reach cages, unique skirt geometries, vacuum-adapted tooling, or tight-clearance footprints, our engineering team can design and manufacture custom microstops tailored precisely to your airframe specifications.