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Hollow Hexagonal Drill Steel

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Hollow rock-drill steel used for rolling the hollow rock-drilling rod is a special alloy steel containing Fe base, W, C, Si, Mn, Cr and V. Its advantages are long service life and high quality.
  • Hollow Drill Steel
  • Bart KingKong
  • Hollow Hexagonal Drill Steel
  • Hollow Drills Steels
  • 0.4m-10m length
  • 4°46′,6,7 ,11,12degree
  • steel grade
  • granite and marble quarry, gold mine, railway, tunne
  • 500mm,1000mm,1500mm,2000mm,2500mm,3000mm,3500mm,4000mm,4500mm,5000mm,5500mm,6000mm.
  • 95CrMo, 23CrNi3Mo, 40SiMnCrNiMo, 35SiMnMoV

Hollow Hexagonal Drill Steel, is a rock drill steel or integral drill steel without tips. Hollow Drill Steel Bar is a type of steel specially used in drill rod manufacture, high intension and toughness.

Material: 95CrMo (Same as SANDBAR 20 or C253)

Diameter: Hex. 22mm, 25mm, 28mm, 32mm, 38mm.

Length: 800mm, 1600mm, 2400mm, 3200mm or any length according to your requirement.

Package: Wrapped with plastic knitting and then into bundles.

Integral drill rod without tip shank sizes 82.5 mm*22mm(3 1/4”*7/8”), 108mm*22mm(4 1/4”*7/8”), 108mm*25mm(4 1/4”*1”), 159,*25mm(6 1/4”*1). Lengths: 400mm to 6400mm(1’4”-21’). Head diameters: 27mm to 40mm.

Type Length(mm)



Hollow Hexagonal Drill Steel has following advantages:

1. High fatigue strength and toughness, high intension.

2. High resistance to wear and permanent distortion.

3. Industrial process of heat treatment.

4. Uniform straightness, eliminating the need for straightening. 

Hot Rolled Hexagonal Hollow Drill Steel

Steel Grade: 95CrMo

Chemical Composition:

    C: 0.92-1.03PCT

    Si: 0.25-0.45PCT

    Mn: 0.25-0.45PCT

    Cr: 0.80-1.20PCT

    Ni: 0.25PCT MAX

    Mo: 0.20-0.30PCT

    S,P: 0.025PCT MAX

    Cu: 0.30PCT MAX

Hollow drill steel reduces the expense of impact energy, improves the drilling speed and efficiency, also it can be used for drilling bore hole diameter from 30mm to 41mm usually. Each rods use premium quality alloy steel and advanced industrial process to assure high drilling performance.


55SiMnMo: Hollow Drills Steels used for H19 H22 H25 Taper Drill Rods.

35SiMnMoV: D32 D38 Hollow Drill Steels.

Z708 sanbar 61/ 40SiMnCrNiMo: Round Drill Steels, D45 D51.

Sanbar 23/ 25CrNi3Mo Steels: Drill Rod with thread connection. surface hardness HRC58-62. Core hardness: HRC43-45.

Photos of Bart-KINGkONG Hollow Rock Drilling Steels

Hollow Hexagonal Drill Steel08Hollow Hexagonal Drill Steel07

Hollow Hexagonal Drill Steel04Hollow Hexagonal Drill Steel06

Contact Amy Zhang for more details


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