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Taps and dies

Baer Thread cutting set M3–M12, HSS-G

Taps and dies from M3 to M12, in ground HSS — the sizes that cover almost every workshop repair.

Baer Thread cutting set M3–M12, HSS-G, product photograph

Baer Thread cutting set M3–M12, HSS-G

Taps and dies from M3 to M12, in ground HSS — the sizes that cover almost every workshop repair.

Range
M3 to M12
Material
HSS-G (ground high-speed steel)
Covers
Internal threads (taps) and external threads (dies)
Amazon reference
B09Z25RGQH
EAN
4058462189814
  • HSS-G means ground rather than rolled flutes: sharper and more accurate
  • M3–M12 covers the vast majority of workshop fasteners
  • Not sold on the American store at the time of checking

Best for: Repairing stripped threads and making threaded holes properly

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Specifications

Range
M3 to M12
Material
HSS-G (ground high-speed steel)
Covers
Internal threads (taps) and external threads (dies)
Amazon reference
B09Z25RGQH
EAN
4058462189814

HSS-G is the specification

Ground flutes rather than rolled ones mean a sharper cutting edge and a truer thread. On taps, that is the difference between a tool that cuts and one that pushes metal around.

Threads are repairs

Most workshop threading is fixing something: a stripped hole in an engine casing, a bracket that needs a new bolt size, a nut welded on badly. Having M3 to M12 to hand turns those from a trip to a supplier into ten minutes.

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

What tapping drill do I need?

A rough rule for metric coarse threads: drill diameter equals the thread diameter minus the pitch. M6 × 1.0 needs a 5.0 mm (0.20 in) hole; M8 × 1.25 needs 6.75 mm (0.27 in); M10 × 1.5 needs 8.5 mm (0.33 in). Undersize holes break taps and oversize ones give a weak thread — this is the one place to consult a chart rather than guess.

How do I avoid breaking a tap?

Cutting fluid, a quarter-turn back for every half-turn forward to break the chip, and a tap wrench that keeps the tap square to the hole. Most breakages happen because the tap is leaning or because a long chip has jammed in the flute. In blind holes, back the tap out and clear it.

Welders this fits

More drill bits & taps

  • Baer Thread cutting set M3–M12, 30 pieces, product photograph

    Baer Thread cutting set M3–M12, 30 pieces

    The same range with the matching drills in the box — no chart, no arithmetic, no broken taps.

    Range
    M3 to M12
    Quantity
    30 pieces
    Material
    HSS-G
    Includes
    Taps, dies and matching tapping drills
    Amazon reference
    B08KGJL6YT
    EAN
    4058462016844
    • The tapping drills are in the box, matched to each thread
    • Removes the commonest cause of broken taps: an undersized hole
    • €138 — twice the set without drills

    Best for: Someone who taps rarely enough to forget the drill sizes each time

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  • Bosch Professional HSS-Cobalt ProBox, 19 pieces, product photograph

    Bosch Professional HSS-Cobalt ProBox, 19 pieces

    Cobalt bits, which exist for one reason: stainless steel work-hardens and ordinary HSS gives up.

    Material
    HSS-Cobalt (HSS-Co)
    Quantity
    19 bits
    Named use
    Stainless steel
    Amazon reference
    B009CGDSYI
    EAN
    3165140689786
    • Cobalt alloy holds its edge at the temperature stainless generates
    • A 19-piece set covers the common sizes in one box
    • More brittle than plain HSS — they chip if the work moves

    Best for: Anyone who has burnt out ordinary bits trying to drill stainless

    ≈ $66
    Check price on Amazon
  • APRW combination drill and tap bits with their storage case

    APRW AP-6 combination drill-tap set

    A combination drill-tap set whose contents bullet lists six imperial sizes and six metric ones, in a set the same sentence calls six pieces.

    Amazon reference
    B0FWQX4YL9
    EAN
    0780748644802
    • Surface nitriding rather than a coating, which hardens the steel itself rather than sitting on it
    • A back taper that extends beyond the tap, stated to prevent over-drilling damaging the thread
    • The contents bullet lists six imperial sizes and six metric sizes in a "6-Piece" set

    Best for: A range of small threads in soft metal and thin panel, once the contents are confirmed

    ≈ $15
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Elsewhere in the workroom

  • Set of nickel-plated 6 inch locking C-clamp pliers

    Biugaaufai 6 Inch locking C-clamp set

    A set of 6-inch locking clamps whose own listing cannot agree on how many are in the box.

    Amazon reference
    B0DNFD3KD7
    EAN
    0729767456652
    • Several clamps in one purchase, which is how a frame actually gets held
    • Nickel-plated alloy steel, stated
    • The title says "6 Pack" and the first bullet says "four 6-inch C-Clamp pliers" — the quantity is not settled anywhere on the page

    Best for: Small work and body panels, where several modest clamps beat one large one

    ≈ $33
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  • CESFONJER MB15 wear parts set, 0.8 mm, 20 pieces, product photograph

    CESFONJER MB15 wear parts set, 0.8 mm, 20 pieces

    Twenty pieces for €20 — enough contact tips that changing one stops feeling like a decision.

    Torch
    MB15
    Wire diameter
    0.8 mm (0.03 in)
    Contents
    20 pieces, including 5 gas nozzles
    Amazon reference
    B07Y3MFRRM
    EAN
    0716852507948
    • Enough tips that you change them at the first sign of wear rather than the last
    • MB15 is the fitment on most small and portable machines
    • Unbranded consumables vary in copper quality and thread finish

    Best for: Small-machine owners who weld regularly and have been nursing one tip

    Check price on Amazon
  • KAKA Industrial cast iron 90 degree angle clamp holding two square tubes

    KAKA INDUSTRIAL AC-100

    The only clamp on this shelf that holds a right angle on its own, bolted to a bench — with a copper-plated screw so spatter does not weld to the thread.

    Amazon reference
    B0159ZUQ22
    EAN
    0745369240840
    • Holds a true 90 degrees mechanically, which is what this hub’s buying tip says magnets cannot do
    • Publishes all three jaw dimensions — 4 in opening, 2-1/4 in height, 3-1/2 in width
    • The listing calls 26 lb a "lightweight design" in the same sentence that publishes the figure

    Best for: Repeating the same square corner, where the clamp sets the angle instead of a magnet suggesting it

    ≈ $155
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All drill bits & taps

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