Find out what an unmarked fitting is This kit identifies six common U.S. hydraulic fitting standards: NPT, NPSM, JIC, SAE 45°, ORFS, and O-Ring Boss. Match the part to a card, find its size, then confirm the thread and seat angle with the gauge. It works on male and female ends and packs into one vinyl bag for the service truck or the bench. How to identify a fitting 1Match the shape Compare the end of the fitting to the drawings and pick the card that matches. If it has a flare or cone seat, hold it against the angle gauges on the tool to confirm the angle. 2Find the size Test the part against the sizes on that card until you find the closest fit. The chart on the card gives you the dash size and nominal size. 3Confirm the thread Set the pitch gauge in the threads. When the teeth sit flush with no light showing between them, read the TPI and check it against the card's chart. Male outside diameter Female inside diameter Inside or outside threads The six standards on the cards Where a fitting seals is often the fastest way to narrow it down. Standard Thread Seals on NPT Tapered pipe The threads NPSM Straight pipe 30° seat (60° included) in the female swivel JIC Straight UN/UNF 37° flare SAE 45° Straight UN/UNF 45° flare ORFS Straight UN O-ring in the flat face O-Ring Boss Straight UN/UNF O-ring at the base of the male thread Fittings that are easy to mix up Some of these standards share a thread, so a thread count alone won't settle it. Check these instead. JIC or SAE 45°? Several dash sizes use the same thread. Check the flare instead: JIC is 37° and SAE is 45°, and the gauge has a guide for each. NPT or NPSM? They share threads per inch and are close in diameter. NPT threads taper and seal on the threads. NPSM threads run straight, and the swivel seals on a 30° seat. JIC or O-Ring Boss? Male ends share the same UN/UNF thread sizes. A JIC male has a 37° flare on the nose. An ORB male has an O-ring at the base of the thread instead. What's in the bag Six identification cards One card per standard. Each has a chart of dash size, nominal size, and threads per inch for every size on the card. Angle and thread pitch gauge Reads 11, 11.5, 12, 14, 16, 18, 19, 20, 24, 27, and 28 TPI, plus 1.0, 1.5, and 2.0 mm metric pitch, on inside or outside threads. Angle gauges for 37°, 45°, 30° (60° included), and 12° (24° included) seats. Also sold separately. Blue vinyl bag Holds the cards and gauge together so nothing goes missing between jobs. Working on British or metric equipment? The cards cover U.S. standards only. The gauge reads metric pitch, but to identify BSPP, BSPT, JIS, DIN, Komatsu, or Kobelco fittings, use the TGK-01 BSP and metric thread gauge kit.
