Last reviewed: July 2026 · MLC editorial team · US market edition
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Most tap and die sets are bought to repair threads, not cut them - and the carbon-steel bargain sets are fine for exactly that. Cutting new threads in steel is a different job that wants HSS. Knowing which side of that line your work falls on decides whether £30 or £150 is the right spend. Our thread pitch chart and tap drill charts carry the numbers to go with them.
How we picked these
- HSS (high-speed steel) for cutting new threads; carbon steel is acceptable for chasing/repair only
- Ground threads over rolled for accuracy
- Taper, second and plug taps for blind holes - cheap sets include only taper
- A tap wrench that holds square - the T-handle in budget sets is usually the worst tool in the box
Prices shown are typical street prices in $ at review time and move with promotions. Links are affiliate links - MLC earns a commission on qualifying purchases at no extra cost to you, which funds the free reference charts on this site.
Reviewed picks
Irwin Hanson 26376 (76pc, machine screw + fractional + metric)
The US machine-shop staple - proper HCS ground threads, both unified and metric coverage, and open-stock replacements everywhere.
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Typical price: $180-$240 · Check price on Amazon (ad)
GEARWRENCH 3887 (75pc ratcheting)
The ratcheting tap handles are genuinely clever in tight spots, and the drive system beats bar-handles for feel.
Typical price: $160-$220 · Check price on Amazon (ad)
Drill America HSS sets (size-by-size)
The pro move: skip the 100-piece case and buy HSS taps individually in the sizes your work actually uses.
Typical price: $8-$25 each · Check price on Amazon (ad)
Muzerdo 86-piece (SAE + metric)
The budget repair set - thread chasing and light-duty cutting with full both-system coverage for the money.
Typical price: $40-$60 · Check price on Amazon (ad)
Recommendations at a glance
| Pick | Typical price | Link |
|---|
| Irwin Hanson 26376 (76pc, machine screw + fractional + metric) | $180-$240 | Amazon |
| GEARWRENCH 3887 (75pc ratcheting) | $160-$220 | Amazon |
| Drill America HSS sets (size-by-size) | $8-$25 each | Amazon |
| Muzerdo 86-piece (SAE + metric) | $40-$60 | Amazon |
Related reference on MLC
Frequently asked questions
Carbon steel or HSS taps?
HSS cuts new threads in steel and stainless and survives production use; carbon steel dulls fast in steel but chases existing threads perfectly well. The bargain 110-piece cases are carbon - fine as repair kits, frustrating as cutting tools.
What is the difference between taper, second and plug taps?
Chamfer length. Taper taps lead in gently for starting square in through-holes; second taps carry less lead; plug (bottoming) taps cut nearly to the bottom of blind holes. Blind-hole work uses taper then plug - which is why sets containing only taper taps disappoint.
What size hole do I drill before tapping?
Nominal diameter minus thread pitch, for standard 75% engagement metric threads - an M8x1.25 wants a 6.8mm drill. Our tap drill charts list every size, imperial included, so you never guess.
Why do my taps keep breaking?
Wrong hole size (too small), no cutting fluid, or driving without backing off. Rule: half a turn forward, quarter back to break the chip, and use actual tapping compound in steel. Taps break in torsion the instant chips pack the flutes.