Home / Drilling & Tapping / Tapping / Tap, Acme Tandem , 1/2″ – 10 TPI, Left Hand, Widdell, USA Tap, Acme Tandem , 1/2″ – 10 TPI, Left Hand, Widdell, USA$49.00 Category: Tapping Related products Tap, Metric, M7 x 1 OSG (3 Available) “New” $5.00 Read more Tapping Head, Procunier #3 Morse Taper #3 Shank, Fits Clausing 20″ Drill $249.00 Read more Die Head, Threading Threads, National Acme DS 1-5/8 $149.00 Read more Tap, Acme Tandem, 7/8″ – 6 TPI Right Hand $75.00 Read more