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Knightsbridge 51mm Bi-Metal Holesaw - Yellow

£599
The RRP is the manufacturer's recommended retail price of the item.
Limited Stock
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Description

The Knightsbridge 51mm bi-metal holesaw features a 51mm overall diameter cutting edge with 4/6 TPI (teeth per inch) variable tooth geometry, designed to cut through steel, stainless steel, die-cast metals, hardwood floors, plywood and plastics. The bi-metal construction combines a high-speed steel cutting edge with a spring steel body, giving the saw resistance to heat and tooth stripping when cutting harder materials.

Designed for electrical installation work where a 51mm diameter hole is required for downlights, ceiling speakers, or cable pass-throughs, the holesaw provides a 38mm maximum cutting depth and fits standard arbors (sold separately, use Knightsbridge HSARBORL arbor). The variable tooth pitch reduces vibration during cutting and improves chip clearance compared to fixed-pitch designs, which matters when drilling through layered materials like plasterboard-backed steel stud.

The bright yellow finish on the steel body makes the holesaw easy to locate in a toolbox or on a site floor. The bi-metal edge retains sharpness through multiple cuts in soft and medium-hardness materials, though cutting depth and lifespan reduce when used on stainless steel or hardened metals compared to softwood or plywood.

Specification
Diameter 51 mm
Recessed Depth 38 mm
Cut-out Diameter 51 mm
Construction Steel
Finish Yellow
Warranty 0
Downloads

Product Specification Sheet

Frequently Asked

What arbor does this holesaw require?

The 51mm holesaw fits the Knightsbridge HSARBORL arbor, sold separately. The arbor provides the mandrel and pilot drill bit needed to centre and drive the holesaw during cutting.

What materials can it cut?

The bi-metal construction handles steel, stainless steel, die-cast metals, hardwood floors, plywood and plastics. Cutting depth and blade life are longest in softwood and plywood, and reduce when cutting stainless steel or hardened metals.

What's the maximum cutting depth?

The holesaw cuts to a maximum depth of 38mm in a single pass. For materials thicker than 38mm, the hole must be cut from both sides or the saw withdrawn and repositioned.

What does 4/6 TPI variable teeth mean?

TPI (teeth per inch) refers to tooth density. Variable pitch means the spacing between teeth alternates between 4 TPI and 6 TPI sections along the cutting edge, which reduces vibration and improves chip clearance when drilling layered or mixed materials.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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    Description

    The Knightsbridge 51mm bi-metal holesaw features a 51mm overall diameter cutting edge with 4/6 TPI (teeth per inch) variable tooth geometry, designed to cut through steel, stainless steel, die-cast metals, hardwood floors, plywood and plastics. The bi-metal construction combines a high-speed steel cutting edge with a spring steel body, giving the saw resistance to heat and tooth stripping when cutting harder materials.

    Designed for electrical installation work where a 51mm diameter hole is required for downlights, ceiling speakers, or cable pass-throughs, the holesaw provides a 38mm maximum cutting depth and fits standard arbors (sold separately, use Knightsbridge HSARBORL arbor). The variable tooth pitch reduces vibration during cutting and improves chip clearance compared to fixed-pitch designs, which matters when drilling through layered materials like plasterboard-backed steel stud.

    The bright yellow finish on the steel body makes the holesaw easy to locate in a toolbox or on a site floor. The bi-metal edge retains sharpness through multiple cuts in soft and medium-hardness materials, though cutting depth and lifespan reduce when used on stainless steel or hardened metals compared to softwood or plywood.

    Specification
    Diameter 51 mm
    Recessed Depth 38 mm
    Cut-out Diameter 51 mm
    Construction Steel
    Finish Yellow
    Warranty 0
    Downloads

    Product Specification Sheet

    Frequently Asked

    What arbor does this holesaw require?

    The 51mm holesaw fits the Knightsbridge HSARBORL arbor, sold separately. The arbor provides the mandrel and pilot drill bit needed to centre and drive the holesaw during cutting.

    What materials can it cut?

    The bi-metal construction handles steel, stainless steel, die-cast metals, hardwood floors, plywood and plastics. Cutting depth and blade life are longest in softwood and plywood, and reduce when cutting stainless steel or hardened metals.

    What's the maximum cutting depth?

    The holesaw cuts to a maximum depth of 38mm in a single pass. For materials thicker than 38mm, the hole must be cut from both sides or the saw withdrawn and repositioned.

    What does 4/6 TPI variable teeth mean?

    TPI (teeth per inch) refers to tooth density. Variable pitch means the spacing between teeth alternates between 4 TPI and 6 TPI sections along the cutting edge, which reduces vibration and improves chip clearance when drilling layered or mixed materials.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.