1/4"UNF Imperial Thread. These Are An Imperial UNF (Unified) Thread.
10x 1/8"BSP STRAIGHT ANGLED HYDRAULIC GREASE NIPPLES JCB IMPERIAL CLASSIC THREAD
Lumatic Hydraulic Nipple Straight Imperial Thread 3/8" UNF
Lumatic Hydraulic Nipple Straight Imperial Thread 1/4" BSP
Lumatic Hydraulic Nipple Straight Imperial Thread 1/4" BSF
Lumatic Hydraulic Nipple Straight Imperial Thread 5/16" BSF
Lumatic Hydraulic Nipple Straight Imperial Thread 1/4" WHITWORH