Yih Troun / Y.T. Indexable Cutting Tool Systems
Taiwanese indexable tooling by Yih Troun / Y.T. since 1977: UFO Family tapered-polygon heads (±0.01 mm), D50–300 mm slitting saws, ±0.008 mm spot drills, M3–M36 counter bores, and Chamfer King countersinks.
Yih Troun / Y.T. UFO Family Modular Milling Tools
Yih Troun / Y.T. UFO tools join CB3 and CB3W shanks via a tapered-polygon interface at ±0.01 mm. The line spans T-slot inserts from 0.5 mm (0.1 mm steps) and 55°/60° thread mills (Ø10–25 mm). Serviceable items include 3TS2580-10 heads, 3T1635-3.0-ME, and B100 inserts.
- Tapered polygon ±0.01 mm
- CB3 / CB3W / Capto shanks
- T-slots from 0.5 mm (0.1 mm step)
- Inserts 3T1635-3.0-ME, SNGW1205-ME
Yih Troun / Y.T. Slitting, Slotting and Cut-Off Cutters
Yih Troun / Y.T. slitting cutters cover D50–300 mm diameters and 1.4–30 mm widths up to 17,200 rpm. Thin SB 1.0 and 1.2 mm blades (Ø50–100 mm) use LNGT inserts, while heavy discs run CNGX 1005/1305/1605. Replaceable items cover SC/SCL bodies, BLL holders, and screws.
- D50–300 mm, up to 17,200 rpm
- SB 1.0 & 1.2 mm thin blades
- LNGT 1010N–1213N & CNGX inserts
- SC / SCL cutters & BLL arbors
Yih Troun / Y.T. Spot Drills, Center Drills and 390 Engraving
Yih Troun / Y.T. spot drills (90°, 90°+142°, 142°) and center drills (60°, 60°+120°, 90°) hold ±0.008 mm eccentricity via tapered-key clamping. Fully ground carbide inserts replace worn edges without pulling the shank. The 390 engraving tool starts at Ø0.15 mm with TU1 shanks and GA centralizers.
- Eccentricity ±0.008 mm
- Spot angles 90° / 90°+142° / 142°
- Center angles 60° / 60°+120° / 90°
- 390 engraver Ø0.15 mm, TU1 / GA
Yih Troun / Y.T. Counter Bore SDET and Chamfer King Series
Yih Troun / Y.T. counter bores cover M8–M36 seats with 4-edge SDET06 and SDET09 inserts, while 4-in-1 tools start at M3. Holders come as CBK/HBM for drill presses and CBI for CNC machines. Chamfer King countersinks span Ø4–Ø110 mm with replaceable carbide strips and screws.
- M8–M36 seats & 4-in-1 from M3
- 4-edge SDET06 / SDET09 inserts
- CBK / HBM (drill) & CBI (CNC)
- Chamfer King Ø4–Ø110 mm
Yih Troun / Y.T. Dovetail, Aluminum Face Mills and UFO Mill
Yih Troun / Y.T. makes indexable dovetail cutters, aluminum alloy face mills, and UFO Mill common holders with swappable heads. Vertical insert sintering since 2005 spans 1,000+ insert items across 4,500 cutters. Spare heads, carbide inserts, and Swiss screws cut downtime.
- Dovetail & Aluminum Face Mills
- UFO Mill common holder system
- 1,000+ in-house carbide inserts
- 4,500+ standard indexable cutters
UFO Modular System and CB3 / CB3W Shank Compatibility
The Yih Troun / Y.T. UFO system uses a patented tapered-polygon fit holding ±0.01 mm positioning tolerance. A single CB3 or CB3W shank (HSS or carbide for deep-overhang stability) accepts over 400 inserts, while six Capto shanks cover 1,400+ UFO inserts.
Applications span T-slot inserts starting from 0.5 mm (0.1 mm increments), 55°/60° thread mills (Ø10–25 mm, 4–6 teeth, full/partial profiles, Rc/NPT), and six profile types including dovetail, circlip, radius, and dual chamfer.
SB Saw Blades, SC / SCL Side Milling and CNGX Disc Cutters
Slitting and slotting cutters span D50–300 mm outer diameters and 1.4–30 mm thicknesses with clamping rated to 17,200 rpm; thin SB blades in 1.0 and 1.2 mm (Ø50–100 mm) take LNGT 1010N, 1011N, 1212N, and 1213N inserts.
SCL cutters pair with BLL holders on face milling arbors for higher rigidity than long side-milling arbors (SC), while heavy disc cutters run fully ground 4-edge CNGX 1005 / 1305 / 1605 inserts for rapid wide-slot roughing.
Spot Drills, M3–M36 Counter Bores and Chamfer King
Spot drills (90°, 90°+142°, 142°) and center drills (60°, 60°+120°, 90°) maintain ±0.008 mm eccentricity; the 390 engraving tool starts at Ø0.15 mm with an HSS TU1 shank, Swiss screw, and GA centralizer.
Counter bores cover M8–M36 seats using 4-edge E-grade SDET06 and SDET09 inserts across CBK/HBM (drill press carbide stripe) and CBI (CNC) holders, while 4-in-1 tools start at M3 and Chamfer King countersinks cover Ø4–Ø110 mm.
Yih Troun / Y.T. and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Yih Troun / Y.T. and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.
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Documents and sources
- Yih Troun / Y.T. official homepage — 4,500+ standard indexable cutters and 30+ patents
- Yih Troun company history — established 1977, vertical carbide sintering and global patents
- Y.T. E-Catalogs — 2026.10 Asia / Europe catalogs and 2025.08 4-in-1 counter bore catalog
- Indexable UFO Family Series (A01) — tapered-polygon ±0.01 mm, CB3/CB3W, thread milling
- Indexable Slitting / Slotting / Cut-Off Series (A02) — D50–300 mm, 17,200 rpm, CNGX inserts
- Indexable Center Series (A03) — spot and center drills ±0.008 mm, 390 engraving tool
- Indexable Counter Bore Series (A04) — M3–M36 seats, SDET06/SDET09, CBK/HBM and CBI
- UFO T-Slot cutter case study (FAQ-31) — CB3-2016-150-30 holder and 3T1635-3.0-ME B100
- SB saw blade 1.0 & 1.2 mm series (FAQ-29) — Ø50–100 mm and LNGT 1010N–1213N inserts
- Indexable UFO Family overview (FAQ-17) — 0.5 mm in 0.1 mm increments, taper triple-convex
- UFO bore machining field test (FAQ-15) — CB3-3225-170, 3TS2580-10 head, SNGW1205-ME
- Side milling cutter SC vs SCL (FAQ-02) — BLL holder mounting on face milling arbor
