Purchased from Boeing as surplus equipment. Brand new, never used. No manufacturer packaging.
Genuine Zephyr Tool Group (ZEPHYR MFG. CO. INC.) aerospace-grade microstop countersink tool, pulled from Boeing surplus inventory. This is a heavy-duty, high-performance unit designed for precision countersinking in aircraft assembly and manufacturing.
Key Features & Specs (from manufacturer data):
- Model: ZT692 series (stamped clearly on the body)
- Internal cutter thread: 7/16-20
- Cutter capacity: Supports up to 1.5"–2" diameter countersink cutters (depending on footpiece; this appears to be a larger "W" or "WW" style full cage)
- Precision depth adjustment in 0.0005" increments with knurled micrometer-style collar and clear scale markings (10, 15, N, etc. visible)
- Heavy-duty construction with full ball bearing design for radial and thrust loads — rated for continuous operation up to 6,000 RPM
- Fail-safe positive stop to prevent over-countersinking and workpiece damage
- Drive shaft: 3/8" round with three flats (TF style) for secure collet or quick-change holding
- Removable black footpiece with large window/opening for chip evacuation and visibility
- Includes the adjustment lock ring and robust thrust system for long service life between adjustments
This tool is built for demanding aerospace applications where repeatable, flush countersinks are critical (rivets, fasteners, composites, etc.). Excellent condition — new/old stock, never used in production. Minor shelf wear or marks from storage only; no damage, rust, or operational wear.
Manufacturer: Zephyr Tool Group (Inglewood, CA) — a trusted name in aircraft tooling since 1939. Often specified on Boeing and other OEM tooling lists.
Perfect for aircraft maintenance, sheet metal shops, composite work, or precision metal fabrication. Comes exactly as shown in the photos.
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