HSS hole saws thread version 1/2-20 UNF

Bimetal hole saw Co8/M42 dia. 25 mm cutting depth 36 mm for steel, stainless steel, sheet metal, wood

Item number: 25100425
EAN: 4007220062357
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Dia. external
Technical information

Bimetal hole saw Co8/M42 dia. 25 mm cutting depth 36 mm for steel, stainless steel, sheet metal, wood

Cutting depth, max
36 mm
Cutting depth, max [inch]
1.7 /16 Inch
Dia. external
25 mm
Dia. external [inch]
1 Inch
RPM from, rust and acid-resistant steels
175 RPM
RPM from, soft non-ferrous metals
470 RPM
RPM from, steels up to 1,200 N/mm²
350 RPM
RPM from, thermoplastics, fibre-reinforced plastics (GRP/CRP)
560 RPM
Packaging unit
1 piece

Hole saws are made from tough, shatter-proof, sturdy HSS bimetal. The saw teeth are made from high-quality M42 (Co8) material. They are used for cutting out holes.

The thread version 1/2-20 UNF includes the thread LS 14 to LS 30. Matching hole saw arbors are LSS 1 and LSS 4.

  • Cost-effective sawing of round cut-outs.
  • Chattering during sawing is prevented by the alternating tooth pitch.
  • High concentricity.
  • Good chip removal.
  • The hole saw is conveniently centred and guided via the replaceable HSS pilot drill.
  • Hole saw arbor is supplied with an ejection spring for improved ejection of the sawn material.
Recommendations for use
  • Observe the recommended rotational speeds.
  • Clamp the pilot drill in the hole saw arbor and make sure that it projects at least 3 mm (1/8") over the teeth of the hole saw.
  • When cutting metals, use a high-quality cutting oil, if possible. This facilitates smooth running and extends the hole saw service life. Exception: when working on aluminium, use kerosene instead of cutting oil.
  • HSS hole saws are suitable for work on stainless steel (INOX). In order to avoid corrosion, remove any particles which develop during work from the workpiece. Clean the workpiece chemically or mechanically (etching/polishing, etc.).
  • Make sure that all the teeth are applied evenly. To prevent tooth breakage, avoid swinging movements during sawing.
  • Avoid overheating the tool.
  • Observe the maximum cutting depth.
  • The 25.0 mm diameter is suitable for cutting out holes for plumbing and heating pipes.
Ordering notes
  • Please order hole saw arbors separately.
Safety notes
  • When using shank extensions, the recommended hole saw rotational speeds must not be exceeded. Risk of accidents!
Materials that can be worked
Hard non-ferrous metal
Other non-ferrous metals
Soft aluminium alloys
Soft non-ferrous metal
Soft wood
Stainless steel (INOX)
Steel, cast steel
Steels up to 1,200 N/mm² (< 38 HRC)
Steels up to 700 N/mm² (< 220 HB)
Tough aluminium alloys
Cutting out holes
Drive types
Column drill
Power drill
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