Metric Machine Nut Taps

Metric Machine Nut Taps

Machine nut taps are purpose-built for cutting metric internal threads in nut blanks at production speed. They differ from standard hand or machine taps in two ways: a much longer shank (so cut nuts can travel up the tap and clear of the work), and a geometry optimised for continuous powered tapping rather than the start-stop rhythm of hand work. AIMS Industrial stocks metric nut taps for production threading machines, automatic nut runners, and high-volume tapping setups.

Where nut taps fit

• Production runs of metric nuts and threaded inserts where dozens or hundreds of identical parts are processed in sequence
• Threading machines fitted with bent-shank tap holders, where finished nuts collect on the shank
• Repetitive tapping into nut blanks where tap life and chip clearance are the limiting factors

Sizes we stock

The metric machine nut tap range covers the common production sizes from M3 to M24 in coarse pitch, with metric fine sizes available on request. Bent-shank and straight-shank options are stocked depending on the threading machine.

Brands and material

Our machine nut taps are HSS-grade from Sutton Tools, Bordo, and Champion, chosen for tap life and consistency in production environments. Where the application demands it, HSS-E (cobalt) and surface-treated taps can be sourced for tougher materials and higher cutting speeds.

Tap selection advice

For nut tapping, the chip evacuation pattern is the spec to watch. Spiral-point taps push chips ahead of the cut (good for through-holes), spiral-flute taps lift chips back out (better for blind holes), and straight-flute taps suit shorter chips in cast and free-machining materials. Get the chip pattern right and tap life follows.

Spiral-point versus straight-flute nut taps

The chip evacuation pattern is the spec to watch on production nut tapping. Spiral-point (gun) taps push chips ahead of the cut — perfect for through-holes, which is what nut blanks always are. Straight-flute taps eject chips both ways — more general-purpose but slower in pure production work. For dedicated nut tapping, spiral-point is usually the better choice; straight-flute earns its place where the same tap also handles short-run work.

Speed and feed

Production nut tapping runs faster than hand tapping — typical surface speeds are 15-25 m/min for HSS taps in mild steel, with feed locked to the thread pitch (one full revolution per pitch advance). Tapping fluid reaches the cut at every revolution, either flooded or via mist coolant. Get speed, feed, and lubrication right and tap life can run into thousands of nuts per tap.

Need help sourcing a specific size?

If you're running a less common metric fine pitch, or need bulk ordering for a production line, contact our team — we can source on request and price by volume.