Same Head, Two Grinds
Both use a one-piece YG8C full-carbide head joined to the steel body by RFW. The 3-cutter program covers Ø3–20 mm SDS-Plus; the 4-cutter program covers Ø4–25 mm SDS-Plus. Three or four cutting edges are separate geometry choices within this construction.
4-Cutter (Cross, 90°): Roundest Holes, Best Anchor Precision
Four edges in a symmetric cross balance the cutting forces around the axis. More edges ride the hole wall and the symmetry cancels side load, so the 4-cutter grind drills the roundest, most dimensionally accurate hole and starts with the most precise positioning. In clean, unreinforced concrete it is also the fastest — four edges remove more material per revolution with less single-edge thrust. When the job is precise anchor holes in sound concrete, where hole roundness drives anchor pull-out, the 4-cutter full carbide head is the pick. This is the geometry on the right of the image above.
3-Cutter (Y, 120°): Self-Centering and Rebar-Steady
Three edges at 120° form a triangle — the minimum stable contact set — so at least two edges are engaged at every instant. That buys two things a symmetric 4-cutter cannot match. It self-centers hard on smooth or sloped starts without walking; and it stays steady when an edge meets rebar — instead of grabbing and deflecting, the Y keeps the bit centered and shears through the bar. This is the grind for expected rebar contact and awkward starts: the 120° three-point is the rebar-tolerant, anti-jam geometry. It trades a little of the 4-cutter's clean-concrete speed and hole-wall polish for that stability. This is the geometry on the left of the image above.
Which to Grind for Which Job
| The job | Grind to pick |
|---|---|
| Precise anchor holes in sound concrete | 4-cutter |
| Clean / unreinforced concrete, maximum speed | 4-cutter |
| Rebar contact expected (anchors near bars, post-installed rebar) | 3-cutter |
| Awkward, sloped or smooth-surface starts | 3-cutter |
| Steel deck-plate pass-through | 3-cutter |
| General mixed concrete | Either — 4-cutter for roundness, 3-cutter for rebar safety |
What They Share (Because Both Are Full Carbide Head)
Compare centering, hole tracking and reinforcement behavior for the selected diameter. Carbide grade, joining control, body construction and the machine determine the complete drilling system; confirm performance through the agreed comparison test. the 3-cutter full carbide head guide
OEM & Private-Label
Zhonghuan manufactures both grinds — 3-cutter (Y) and 4-cutter (cross) full carbide head — under OEM and private-label programs, with documented grade, weld method and runout inspection. Contact Zhonghuan Tools with your diameter range and application for a sample plan and quotation.
Related Procurement Programs
Sourcing full carbide head SDS for a distributor or private-label channel? These OEM programs cover both grinds.
- 3-Cutter Full Carbide Head SDS-Plus Manufacturer — OEM / private-label for the 3-cutter (Y) grind.
- Y-Cutter SDS Drill Bits Manufacturer & OEM — the 3-blade 120° geometry as a Heller-Trijet-class OEM line.
- Full Carbide Head SDS-Plus Drill Bits Manufacturer — the full-carbide-head program both grinds belong to.
