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Spiral drills (HM)

For jewellery materials which are difficult to machine, such as pearl and corals, you need a drilling expert: these twist drills of finest grained hard metal have two cutting edges and two flutes, and have a substantially longer service life than traditional tool-steel or HSS twist drills on pealrs and corals.

Twist drill Fig. 4203 "HM"
Material: Finest grain carbide
Execution: 4 grooves
Range of app.: corals, pearls
Shank: 2,35 mm dia.
Rec. speed: 5.000 - 9.000 r.p.m. (freehand drilling)
Rec. speed: 8.000 - 14.000 r.p.m. (upright drilling)
Advantage: durable, solid construction
Subgroups
  • singly
    nameshapehead Øshaft ØPUitem No.
    twist drill4203 / HM0.70 mm2.35 mm1 piece568507
    twist drill4203 / HM0.80 mm2.35 mm1 piece568508
    twist drill4203 / HM0.90 mm2.35 mm1 piece568509
    twist drill4203 / HM1.00 mm2.35 mm1 piece568510
    twist drill4203 / HM1.10 mm2.35 mm1 piece568511
    twist drill4203 / HM1.20 mm2.35 mm1 piece568512
    twist drill4203 / HM1.30 mm2.35 mm1 piece568513
    twist drill4203 / HM1.40 mm2.35 mm1 piece568514
    twist drill4203 / HM1.50 mm2.35 mm1 piece568515
    twist drill4203 / HM1.60 mm2.35 mm1 piece568516
    twist drill4203 / HM1.80 mm2.35 mm1 piece568518
    twist drill4203 / HM2.10 mm2.35 mm1 piece568521
    twist drill4203 / HM2.30 mm2.35 mm1 piece568523
  • Assortment
    nameVersionshapehead Øcontentsitem No.
    twist drillAssortment4203 / HM0.70-1.20 mm6 pieces568500

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