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Band blade · variable pitch

Metallkraft Bi-metal M42 Sprint 1735 × 13 × 0.9, 6–10 TPI

A variable 6–10 tooth pitch, which is what stops a blade juddering on tube.

Metallkraft Bi-metal M42 Sprint 1735 × 13 × 0.9, 6–10 TPI, product photograph

Metallkraft Bi-metal M42 Sprint 1735 × 13 × 0.9, 6–10 TPI

A variable 6–10 tooth pitch, which is what stops a blade juddering on tube.

Type
Bi-metal M42
Dimensions
1735 × 13 × 0.9 mm (68.3 × 0.51 × 0.04 in)
Pitch
6–10 teeth per inch, variable
Suited to
Small and medium wall thicknesses
Amazon reference
B07T157WYF
EAN
4036351036975
  • Variable pitch damps the harmonic that makes a constant-pitch blade judder
  • M42 bi-metal: a high-speed-steel edge welded to a flexible backing
  • Blade length is machine-specific — 1735 mm (68.3 in) fits only saws built for it

Best for: General cutting of solid bar and thicker-walled section

≈ $59
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Specifications

Type
Bi-metal M42
Dimensions
1735 × 13 × 0.9 mm (68.3 × 0.51 × 0.04 in)
Pitch
6–10 teeth per inch, variable
Suited to
Small and medium wall thicknesses
Amazon reference
B07T157WYF
EAN
4036351036975

M42 is the standard worth paying for

A bi-metal blade has a high-speed-steel cutting edge electron-beam welded to a spring steel back. The edge holds hardness at cutting temperature; the back flexes around the wheels without cracking. Carbon blades are cheaper and blunt quickly in steel.

Three teeth in the cut

The rule that governs pitch choice: at least three teeth should be engaged at any moment. On 3 mm (0.12 in) wall tube, 6–10 TPI is marginal; on 20 mm (0.79 in) solid bar it is right. Choose the pitch for the thinnest wall you cut, not the thickest.

Sources

Every figure above comes from the manufacturer’s published specification for this reference. Fields the listing does not publish are left out rather than estimated. Market availability was verified per market on the EAN.

The questions welders ask

How do I read « 1735 × 13 × 0.9 »?

Length, width, thickness, all in millimeters. Length must match your saw exactly — it is set by the wheel centers and the tension range. Width affects how tight a curve the blade can follow and how much beam strength it has; thickness affects flexibility around the wheels. Only the length is non-negotiable.

What does variable pitch do?

It breaks up the resonance. A constant-pitch blade meets the workpiece at a fixed frequency, which sets up a judder that you hear and see in the cut. Varying the tooth spacing spreads that across a band of frequencies, so the cut is quieter, smoother and kinder to the teeth.

Welders this fits

More metal saw blades

  • Sägeband-Manufaktur M42 1638 × 13 × 0.9, 10/14 TPI, 3-pack, product photograph

    Sägeband-Manufaktur M42 1638 × 13 × 0.9, 10/14 TPI, 3-pack

    A 10/14 pitch: the one to fit when the work is tube and thin wall rather than solid bar.

    Type
    Premium M42 HSS bi-metal
    Dimensions
    1638 × 13 × 0.9 mm (64.5 × 0.51 × 0.04 in)
    Pitch
    10/14 TPI, variable
    Quantity
    3 blades
    Amazon reference
    B07N89PKT8
    EAN
    4251413656469
    • 10/14 keeps three teeth in a thin wall, where a 6–10 blade strips
    • German blade maker specializing in bands rather than a general accessories brand
    • Fine pitch cuts more slowly in solid bar

    Best for: Cutting tube, box section and thin-walled stock accurately

    Search Amazon for this model
  • Sägeband-Manufaktur M42 1440 × 13 × 0.65, 14/18 TPI, 5-pack, product photograph

    Sägeband-Manufaktur M42 1440 × 13 × 0.65, 14/18 TPI, 5-pack

    Fourteen to eighteen teeth per inch — for thin-wall tube and sheet, where anything coarser tears.

    Type
    Premium M42 HSS bi-metal
    Dimensions
    1440 × 13 × 0.65 mm (56.7 × 0.51 × 0.03 in)
    Pitch
    14/18 TPI, variable
    Quantity
    5 blades
    Amazon reference
    B07VMRV9GQ
    EAN
    4251413656964
    • 14/18 is the pitch for thin-wall tube and sheet stacks
    • A thinner 0.65 mm (0.03 in) backing flexes more easily around small wheels
    • Very slow in solid material — the gullets fill and the blade rubs

    Best for: Thin-wall tube, conduit and light section on a small saw

    Search Amazon for this model
  • Sägeband-Manufaktur M42 1620 × 13 × 0.65, 8/12 TPI, 5-pack, product photograph

    Sägeband-Manufaktur M42 1620 × 13 × 0.65, 8/12 TPI, 5-pack

    Eight to twelve teeth: the middle pitch, and the one to fit if you only ever fit one.

    Type
    Premium M42 HSS bi-metal
    Dimensions
    1620 × 13 × 0.65 mm (63.8 × 0.51 × 0.03 in)
    Pitch
    8/12 TPI, variable
    Quantity
    5 blades
    Amazon reference
    B0G49MVZB4
    EAN
    4251413669353
    • The compromise pitch: acceptable on both tube and moderate solid stock
    • Five blades, so the saw is never waiting for a delivery
    • A compromise is worse than the right pitch at either extreme

    Best for: A workshop that cuts mixed stock and does not want to change blades constantly

    Check price on Amazon

Elsewhere in the workroom

  • PFERD 4-piece cutting and flap disc set, product photograph

    PFERD 4-piece cutting and flap disc set

    Three cutting discs and a flap disc from a professional abrasives maker — the two jobs, in the right proportion.

    Cutting discs
    3 × 125 × 1.0 mm (0.12 × 4.92 × 0.04 in), straight
    Flap disc
    1 × polishing/finishing disc
    Diameter
    125 mm (4.92 in)
    Amazon reference
    B0B33M94D5
    EAN
    4007220422618
    • A professional abrasives manufacturer rather than a hardware brand
    • Three-to-one is roughly the real consumption ratio of cutting to finishing
    • Four discs is a small quantity for €17

    Best for: Trying a better grade of abrasive before committing to a box

    Search Amazon for this model
  • SIXTOL Welding Mask 1, product photograph

    SIXTOL Welding Mask 1

    Twenty-three euros for an auto-darkening helmet — the cheapest thing on the European half of this site that protects something irreplaceable.

    Type
    Solar-powered auto-darkening
    Modes
    Welding and grinding
    Amazon reference
    B0CL8HN5GM
    EAN
    8595697702129
    • Auto-darkening at €23 — there is no excuse left for a hand shield
    • A grinding mode, so the lens stays clear while you dress the weld
    • No optical class, switching time or viewing area published

    Best for: A first helmet, or a spare so a visitor never welds without one

    Search Amazon for this model
  • Spurtar Welding magnets, 6 × 13 kg, product photograph

    Spurtar Welding magnets, 6 × 13 kg

    Six magnets for €20: they hold a corner square while you tack, and they are not clamps.

    Quantity
    6 magnets
    Hold
    13 kg (28.7 lb) each
    Angles
    45°, 90° and 135°
    Amazon reference
    B08GR33SXH
    EAN
    0696177836667
    • Six magnets means both ends of two joints held at once
    • Three angles cover square corners, mitres and obtuse bracing
    • Magnets hold for tacking and cannot resist a cooling weld

    Best for: Holding a frame square long enough to tack it

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All metal saw blades

Prices quoted in these summaries are dated readings. The live price is shown next to each product.