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HSS, cobalt, step & annular

The best metal drill bits and taps for 2026

Drilling steel well is mostly about speed, pressure and fluid. We cover HSS against cobalt, coatings that earn their price and coatings that do not, step drills and annular cutters — plus taps and dies, with the tapping drill sizes that stop threads tearing out.

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What we recommend

  1. 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
  2. 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

    Search Amazon for this model
  3. 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

    Search Amazon for this model
  4. QWORK titanium-coated combination drill and tap bits in their case

    QWORK DG39142, 1/4-20 drill-tap, 6-pack

    Six combination drill-tap bits in a single thread size — which is not what "6 pcs" means on the two sets beside it on this shelf.

    Amazon reference
    B0GKC9KXWC
    EAN
    0795973764096
    • Six bits of one size, so a snapped bit is replaced immediately rather than ordered
    • Titanium coating on HSS, stated for thermal stability
    • All six bits are 1/4"-20 — this is not a size set, and the title does not make that obvious

    Best for: One thread size used constantly, where the bit that snaps is replaced from the same box

    ≈ $7
    Check price on Amazon
  5. 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
    Check price on Amazon
  6. DKIBBITH titanium combination drill and tap bits in six SAE sizes

    DKIBBITH DKVIP-003, SAE drill-tap, 6-pack

    Six combination bits covering the common small SAE threads, on a listing that tells you the single mistake that strips a thread.

    Amazon reference
    B08JZDWZ9P
    EAN
    0791715205667
    • Six genuinely different sizes — 6-32, 8-32, 10-24, 10-32, 12-24 and 1/4-20 UNC
    • Covers both pitches of the #10 thread, 10-24 and 10-32, which matters more than it looks
    • Titanium coating wears off the cutting edge quickly; the nitrided set at the same price hardens the steel itself

    Best for: The common small machine screw threads, in aluminum and thin steel

    ≈ $15
    Check price on Amazon
  7. Drill America 1/2 inch NPT pipe tap with its matching 23/32 inch drill bit

    Drill America POU1/2NPTW/DRILL, 1/2 in NPT tap and 23/32 in drill

    The only product in this hub that answers the question the shelf is built on — which drill goes with which tap — by putting the two in the same bag.

    Amazon reference
    B01MG92FX1
    EAN
    0887861241854
    • Supplies the tap and its matching tapping drill together — the exact thing this hub’s introduction says stops threads tearing out
    • Publishes both sizes: a 1/2 in NPT tap and a 23/32 in drill
    • A carbon steel tap, which is softer than HSS and intended for chasing an existing thread rather than cutting a new one in solid steel

    Best for: Cutting or recutting a 1/2 in NPT pipe thread without guessing the tapping drill

    ≈ $18
    Check price on Amazon
  8. NEIKO 13-piece combination drill and tap set in its case

    NEIKO 10059A, 13-piece drill-tap set

    The only combination set on this shelf that covers both thread systems and whose stated piece count matches its own contents.

    Amazon reference
    B0762HJ3GF
    EAN
    0816914021129
    • Covers both systems — six SAE sizes and six metric — in one case
    • The arithmetic is right: six plus six plus one adapter is thirteen
    • No coating or surface treatment stated, where the sets at half the price claim titanium or nitriding

    Best for: A workshop that meets both imperial and metric threads and does not want two sets

    ≈ $30
    Check price on Amazon
  9. Greenlee DTAPKIT one-step drill and tap kit with its quick change adaptor

    TEMPO Greenlee DTAPKIT

    A trade kit that publishes the one limit these bits actually have — the thickness of metal it will tap through, up to 10 gauge.

    Amazon reference
    B0041FIR1E
    EAN
    0013161051743
    • Publishes a material thickness limit — up to 10-gauge metal — which only one other listing here does
    • Names the materials properly: aluminum, brass, copper, plastic and mild steel
    • Ten gauge is about 3.4 mm (0.13 in) — thicker section needs a tap and a tapping drill, not a combination bit

    Best for: Electrical and plumbing work on enclosures, strut and panel up to 10 gauge

    ≈ $31
    Check price on Amazon
  10. Milwaukee Shockwave drill and tap bits in five SAE sizes

    Milwaukee 48-89-4874, Shockwave drill-tap, 5-piece

    The only drill-tap set on this shelf built to survive an impact driver, and one of two that publish the metal thickness they will tap.

    Amazon reference
    B08MFS1ZKM
    EAN
    0045242860401
    • Rated for impact drivers as well as drills, which no other set on this shelf claims
    • Publishes a thickness limit — metal up to 1/4 in — the most generous stated figure here
    • Five sizes, the smallest range on this shelf, and no metric at all

    Best for: Tapping on site with the impact driver already in your hand

    ≈ $32
    Check price on Amazon
  11. KOOPOOL 114-piece ratcheting tap and die set laid out in its case

    KOOPOOL 114-piece ratcheting tap and die set

    The only set in this hub that supplies the tapping drills alongside the taps, with the thread tolerance classes and the heat treatment both published.

    Amazon reference
    B0GKG5LNHF
    EAN
    0671891089407
    • Supplies 34 matched HSS drill bits alongside the 68 taps and dies — the tapping drill question answered in the same case
    • Publishes the thread tolerance classes: 6H for metric internal threads and 2B for UNC
    • The highest price on this shelf by a factor of three

    Best for: A workshop that cuts and repairs threads across both systems and wants one case for all of it

    ≈ $100
    Check price on Amazon

Choosing within drill bits & taps, by need

Covering every diameter

There is always one diameter missing when the moment comes. A complete set avoids stopping work for a single bit.

Baer Thread cutting set M3–M12, 30 pieces

The diameters that genuinely serve

A few quality bits, in the diameters actually used, cut better than a complete mediocre set.

Bosch Professional HSS-Cobalt ProBox, 19 pieces

Drill bits & taps and who each one is for

Drilling steel
Coated high-speed bits hold up better and cut for longer. It is where quality is felt immediately.
Tapping
The pilot hole diameter decides everything: too small and the tap breaks, too large and the thread does not hold.
Stainless and hard materials
Stainless work-hardens as soon as you rub without cutting. You need pressure, a low speed and lubricant, from the first second.

The trade-offs of drill bits & taps

Complete set against individual quality
A set covers every diameter with average bits. A few chosen bits in the common diameters cut better and last longer.
A titanium coating costs per bit
Coatings extend life in steel and do not rescue mediocre grinding. Point geometry matters more.
Hand tap against machine tap
The hand set is taken in three successive passes and forgives; the machine tap goes through in one and breaks at the slightest misalignment.

What keeps coming up about drill bits & taps

What pilot hole for tapping?

It is read from a tapping table specific to each pitch. Too small and the tap breaks; too large and the thread holds nothing.

How do I avoid breaking a tap?

Perfect alignment, lubricant, and a quarter turn back every turn to break the chip. A tap broken in a hole is very hard to extract.

Do I need lubricant to drill?

In steel and stainless, yes: it carries the heat away and hugely extends the bit’s life. Cast iron and brass are drilled dry.

Why does my bit no longer cut?

It has overheated and lost its edge, often for lack of lubricant or too high a speed. A blued bit is finished.

How do I drill a large diameter?

With a pilot hole, then opening out. Attacking directly stalls the machine and distorts the hole.

Can a bit be re-ground?

Yes, by hand on a grinder with practice, or with a dedicated sharpener. Point angle and symmetry of the lips decide the result.

Why does the bit wander at the start?

No center punch mark. A simple starting point is enough to stop it wandering on a smooth surface.

How do I drill stainless?

Low speed, firm pressure and lubricant. Rubbing without cutting work-hardens the surface, which then becomes nearly impossible to drill.

In short, on drill bits & taps

The tapping table decides the pilot hole, and a quarter turn back every turn avoids the broken tap. Center punch before drilling, lubricant in steel and stainless, low speed on large diameters — a blued bit cannot be rescued.

Drill bits & taps at a glance

    Drill bits & taps, side by side

    There is no table here, and the reason is in the listings. The figure published most often across these 11 products is material, given by 3 of them — short of the four in five a column needs to compare rather than to display gaps. Each product page says what its own maker published.

    Where each budget reaches on this shelf

    Lower range

    $7 – $15

    3 models

    QWORK DG39142, 1/4-20 drill-tap, 6-pack, APRW AP-6 combination drill-tap set, DKIBBITH DKVIP-003, SAE drill-tap, 6-pack

    Mid range

    $18 – $31

    3 models

    Drill America POU1/2NPTW/DRILL, 1/2 in NPT tap and 23/32 in drill, NEIKO 10059A, 13-piece drill-tap set, TEMPO Greenlee DTAPKIT

    Upper range

    $32 – $100

    3 models

    Milwaukee 48-89-4874, Shockwave drill-tap, 5-piece, Bosch Professional HSS-Cobalt ProBox, 19 pieces, KOOPOOL 114-piece ratcheting tap and die set

    Sources, and the ranking

    Specifications: manufacturer sheets for welding and metalworking machines and the matching Amazon product pages. Prices and availability: Keepa.

    Most recent revision in this category: October 7, 2026.

    How we assess drill bits & taps

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