1. 3/4" UN-S 12 tpiSKU: 1161. 3/4" UNF - UN-S Tap 12 t.p.i. UN Threads. 160mm O/A , 50mm Flute Length. 30.5mm Shank. 25mm Square Drive. 6 Flutes & Centres Both Ends.Manufactured in UK TWT Machine Tools. ShippingFree UK Shipping. £72.00PriceQuantity*Add to Cart