Achieving trouble-free chip evacuation with a spiral tap in blind holes is particularly challenging and is a main cause of headaches for many manufacturers. To resolve this problem and to improve the ejection of chips, OSG’s A-Tap® A-SFT has adopted a variable helix flute design, which encourages stable chip evacuation and reduces cutting forces.

Machine nut taps
Machine nut taps for through holes
for thread depth up to 1.0xD
Nut taps for unalloyed and low alloyed steel
for tapping of non abrasive materials
Trapezoidal nut taps up to Tr 36x6 for right- and left-hand threads
for metric threads up to M 24 with long reduced shank to allow nuts to run over

Short machine taps
Taps for thread cutting by hand and machine
Short machine taps acc. to DIN, ISO and JIS-B
Taps for through and blind holes
for non abrasive material up to 900 N/mm²
Short machine taps for right and left-handed threads (LH)
Taps with short and long thread lead

Short machine taps
M (metric)
M (ISO 529)
Mf (metric fine)
BSW - W (DIN 477)
UNC - UNF
G (BSP) Pipe-thread
Rc (BSPT) tapered
PG Armoured tube thread
NPT (tapered pipe thread)
NPT - left hand
NPTF - NPS