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A curved edge, to put more teeth in the cut

EZARC 802302, arc edge 8 in 14 TPI, 5-pack

The only blade on this shelf whose edge is curved rather than straight — a design aimed squarely at the three-teeth rule this hub is built on.

EZARC arc edge reciprocating saw blade with its curved cutting edge

EZARC 802302, arc edge 8 in 14 TPI, 5-pack

The only blade on this shelf whose edge is curved rather than straight — a design aimed squarely at the three-teeth rule this hub is built on.

Amazon reference
B0H6WRG1GG
EAN
0810151454108
  • A curved edge, stated to engage about 110 per cent more teeth than a straight blade
  • Variable tooth height, stated to improve chip clearance and heat dissipation
  • A curved edge cannot start a cut flush against a surface the way a straight one can

Best for: Thin-wall tube, where tooth engagement is the whole problem

≈ $21
Check price on Amazon

Specifications

Amazon reference
B0H6WRG1GG
EAN
0810151454108

Every other blade on this shelf has a straight edge. This one is curved, and the reason is the rule this hub is built on: keep at least three teeth in the cut. On thin-wall tube a straight blade crossing a round section has almost no teeth engaged as it enters and leaves, which is exactly when a tooth catches the far wall and strips. Curving the edge keeps more of it in contact for more of the stroke, and EZARC puts the gain at about 110 per cent more teeth engaged.

Two other details follow the same logic. The shank is angled 6 degrees, which turns part of the saw’s thrust into a downward force that keeps the teeth biting rather than skating. And the tooth height alternates, so the gullets clear chips rather than packing — which is the other half of the hub’s warning, where too many teeth in the cut burns instead of cutting.

The figures are published properly: M42 high speed steel with 8 per cent cobalt, 14 TPI nominal, 8 in overall with 4.72 in of actual cutting edge, and a material range of 2 to 6 mm (0.08 to 0.24 in) tubing. That range is narrower than the straight blades here claim, which given what the blade is designed for reads as honesty rather than weakness. The one thing a curved blade cannot do is start a cut flush against a flat surface.

Availability

Read on the day this page was built: $20 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-07. The live price is at the top of the page.

The questions welders ask

Why curve the edge?

To fight the three-teeth rule. This hub’s buying tip is that too few teeth in the cut lets a tooth catch the far edge and strip — and on thin-wall tube, a straight blade crossing a round section has barely any teeth in contact at the start and end of each stroke. A curved edge wraps the work slightly, so more teeth are engaged through more of the stroke. EZARC puts the gain at about 110 per cent more teeth engaged, which is a claim rather than a measurement, but the mechanism is sound and it is aimed at precisely the failure this shelf exists to explain.

What does the effective cutting length tell me?

How much blade you actually get. The blade is 8 in overall and 4.72 in of that is toothed cutting edge; the rest is shank and the transition. Few listings publish both figures, and it is the second one that decides whether the blade will reach through your work. On this shelf the TOLESA blades publish only the overall length and give a maximum pipe diameter instead, which is the same information arrived at differently.

More metal saw blades

  • EZARC carbide oscillating multi-tool blades with adapters

    EZARC 801113, carbide oscillating, 3-pack

    Carbide teeth on an oscillating blade, for hardened screws and nails — and one of the few listings on this site that names the mount system it will not fit.

    Amazon reference
    B07YDMX328
    EAN
    0611553064151
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    • States plainly what it will not fit: Starlock, Starlock Plus and Starlock Max
    • No blade width, cut depth or tooth pitch published anywhere

    Best for: Cutting hardened screws, nails and embedded metal flush with a surface

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  • EZARC carbide tipped reciprocating saw blade with welded teeth

    EZARC R678HM, carbide 6 in 8 TPI, 3-pack

    The coarse-pitch carbide blade this shelf needs: 8 TPI for solid section, with each tooth ground and welded rather than cut from the body.

    Amazon reference
    B08FQQ52T8
    EAN
    0611553064410
    • An 8 TPI pitch, the only coarse blade on this shelf, which is what solid section needs
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    Best for: Rebar, car beams and hardened steel, where a bi-metal blade dulls in one cut

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  • Milwaukee 5-3/8 inch carbide metal cutting circular saw blade

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    A cold-cut blade for a cordless metal saw, with cobalt in the carbide and vibration slots in the plate — and no arbor size, kerf or speed rating published.

    Amazon reference
    B0B4PBQ93R
    EAN
    0045242569199
    • Cobalt-infused tungsten carbide stated, which is a tougher grade than plain carbide for ferrous work
    • Laser-cut vibration damping slots in the plate, stated to reduce heat and noise
    • No arbor size published, on a circular blade — the one dimension that decides whether it fits

    Best for: A cordless metal-cutting circular saw on steel and stainless, where a cool, burr-free cut is the point

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Elsewhere in the workroom

  • PGN ER70S-6 solid MIG welding wire, 0.035 inch, on a ten-pound spool

    PGN Bearings ZY-GHM-0902-06, ER70S-6, 0.035 in, 10 lb

    The coarsest of three PGN wires on this shelf, on a listing whose fourth bullet exists purely to state the diameter and the weight clearly.

    Amazon reference
    B07XFFZX3V
    EAN
    0760655001301
    • One of three diameters of the same wire on this shelf — .023, .030 and .035 in — so the range covers sheet to section
    • A bullet devoted to stating the diameter and spool weight plainly, "making the key specifications easy to verify before ordering"
    • Carries a different reference format from the maker’s own .023 in and .030 in wires — ZY-GHM-0902-06 against WW-ER70S6-nnn-10LB

    Best for: Heavier fabrication, bought from a maker that offers the same wire in three diameters

    ≈ $33
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  • VEVOR ER70S-6 MIG welding wire, 0.035 inch, on an eleven-pound spool

    VEVOR ER70S-6, 0.035 in, 11 lb

    The coarser of the two VEVOR wires on this shelf, in the larger spool — and the one whose listing drops the tensile figure its own stablemate publishes.

    Amazon reference
    B0CGCXKFQ2
    EAN
    0840349946337
    • Eleven pounds rather than ten, for a small increase over the brand’s 0.030 in spool
    • States the deoxidiser argument — higher manganese and silicon for dirty, oily or rusted steel
    • Does not publish the 490 MPa tensile figure that the same maker’s 0.030 in listing gives

    Best for: Thicker section and structural work, where 0.035 in lays metal faster than 0.030

    ≈ $27
    Check price on Amazon
  • VEVOR ER70S-6 solid MIG welding wire on a ten-pound spool

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    Amazon reference
    B0GCDRL8V4
    EAN
    0197988178002
    • Publishes a tensile strength — at least 490 MPa — which no other wire in this hub states
    • Names both shielding gas options: 100 per cent CO2, or 80 per cent argon with 20 per cent CO2
    • A ten-pound spool where two wires on this shelf give eleven for less

    Best for: General fabrication where the deposit strength matters and the gas is already decided

    ≈ $25
    Check price on Amazon

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