Image Image NK-Series Japanese Pneumatic Female Threaded Coupler Markets Maintenance Repair Operations (MRO) Product Options Part Number Length Maximum OD Body Size Thread Thread Size Pipe Thread Material 2NKBF2 1.97" 1.02" 1/4" BSPP 1/4" BSPP / BSPT Steel 2NKF2 1.97" 1.02" 1/4" NPT 1/4" NPT / NPTF Steel