HSS CENTRE DRILLS

Type of HSS Drills

CENTRE DRILLS

Drill Standards : IS, JIS, ANSI, DIN and BS

Wide Range : Sizes from 0.30mm to 100mm(Dia) and
Length - up to 1200mm

Tolerances : h6 / h8 / Custom Tolerances

Material Grades used – M2, M35, M42 and ASP

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Customers of HSS Centre Drills
  • Bharat Forge Limited
  • Maruti Suzuki India Limited
  • Rail Wheel Factory
  • Youngshin Automotive India Pvt Ltd
  • Divgi Torq Transfer Systems Pvt Ltd
  • SAAB Engineering Unit - IV
  • Bill Forge Private Limited
  • CNC Automotive
  • Chennai Forge Products Pvt Limited
  • Engine Factory
  • SEP India Pvt Ltd
  • Sundaram Fasteners Limited
  • Sansera Engineering Limited
  • Bus Body Building
  • Railway Cabin Shells
  • Automotive

GALLERY

• A small twist drill used to make centres in a piece of work about to drill further deep.

• Centre drills are usually double-sided drills with a 60' stepped point, held in a drill chuck or collet chuck in a lathe.

• A Center drill is used for drilling a hole on the axis of a shaft to hold it between centres.

• It was also used to drill centre holes on machining Center, but has been replaced by the spot drill (which has a simpler geometry) for this purpose.

The parts are

• Overall Length

• Body Diameter

• Drill Dia

• Drill Length

• Angle

• Overall length is maximum length of centre drill

• Maximum diameter of the Centre Drill is known as Body Diameter.

• The small diameter of centre drill is drill diameter and also known as pilot length

• The length of the small diameter which performs the operation is known as Drill length or Pilot Length.

• The angle of the tip of Center drill.

• countersink angles come in 3 angles: 60°, 82° and 90° included angles.

• A common angle used in live centres is 60°.

• Center drills come in two common types, Type A (DIN 333-A) and Type B (DIN 333-B), based on the Center drill angle.

• Type A forms a centre hole with a single 60-degree chamfer.

• Type B forms a hole with 2 chamfers, a 60-degree chamfer and additionally a 120- degree chamfer at the start of the hole


• There is also a type R (DIN 333-R) that has a radius instead of a chamfer. This forms a centre hole that results in more holding accuracy because there is contact only at a single point, but the load bearing capacity of the hole (ability to withstand lateral forces resulting from cutting) would be less.

    • A small twist drill used to make centres in a piece of work about to drill further deep.

    • Centre drills are usually double-sided drills with a 60' stepped point, held in a drill chuck or collet chuck in a lathe.

    • A Center drill is used for drilling a hole on the axis of a shaft to hold it between centres.

    • It was also used to drill centre holes on machining Center, but has been replaced by the spot drill (which has a simpler geometry) for this purpose.

    The parts are

    • Overall Length

    • Body Diameter

    • Drill Dia

    • Drill Length

    • Angle

    • Overall length is maximum length of centre drill

    • Maximum diameter of the Centre Drill is known as Body Diameter.

    • The small diameter of centre drill is drill diameter and also known as pilot length

    • The length of the small diameter which performs the operation is known as Drill length or Pilot Length.

    • The angle of the tip of Center drill.

    • countersink angles come in 3 angles: 60°, 82° and 90° included angles.

    • A common angle used in live centres is 60°.

    • Center drills come in two common types, Type A (DIN 333-A) and Type B (DIN 333-B), based on the Center drill angle.

    • Type A forms a centre hole with a single 60-degree chamfer.

    • Type B forms a hole with 2 chamfers, a 60-degree chamfer and additionally a 120- degree chamfer at the start of the hole


    • There is also a type R (DIN 333-R) that has a radius instead of a chamfer. This forms a centre hole that results in more holding accuracy because there is contact only at a single point, but the load bearing capacity of the hole (ability to withstand lateral forces resulting from cutting) would be less.