Irwin Tools 585-54009 9-piece bolt extractor set pneumatic accessory
- Drill Bits
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M4×0.70 straight-flute hand tap set in high-speed steel with 19.05 mm thread length and 54.10 mm overall length
This Cleveland C54249 straight flute hand tap cuts M4 threads with a 0.70 mm pitch. It is made from high speed steel with a bright uncoated finish and has four flutes. The thread limit is 2B and the class of fit is 6H for right-hand metric threads. Mechanics and hobbyists use it for through-hole or blind-hole tapping in steel or aluminium.
A fresh tap restores clean thread geometry when an old tool leaves rough flanks or fails the 6H gauge. The jump is worth it when the 75 percent thread drill size of 3.30 mm no longer produces acceptable engagement. The 19.05 mm thread length and 54.10 mm overall length match the original specification so no process change is needed.
The square shank fits common tap wrenches and CNC tool holders without adapters. Bright high speed steel requires cutting fluid to prevent built-up edge and premature wear. The most common error is drilling the 3.30 mm hole off-centre, which leads to bell-mouthed threads and tap breakage.
Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.
| Product | |
|---|---|
| Brand name | CLEVELAND |
| Product type | Taps |
Use a 3.30 mm drill bit for 75 percent thread engagement before tapping.
Start with the taper tap, then the plug tap, and finish with the bottoming tap; keep the tap perpendicular and use cutting oil.
Replace them when threads become rough, cutting requires excessive force, or the flutes show visible wear or chipping.
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