Taper Pipe Plug Gages

About

A taper pipe plug gage inspects an internal tapered pipe thread — the threaded hole a fitting screws into. Because a taper thread seals by wedging rather than by bottoming out, it cannot be accepted on diameter alone: the gage establishes where the thread stands relative to the gaging notch or step, and that standoff is the measurement. WESTport manufactures taper pipe plug gages for NPT, NPTF and ANPT thread forms, precision ground and hand lapped, and certifies every one in our own climate-controlled, ISO/IEC 17025 accredited laboratory with NIST-traceable documentation. The WESTport taper pipe plug gage line Each gage below is a single product covering the full size range and every step type in that form. Select size and step type on the product page. NPT Taper Pipe Plug Gage. L1 plug gages for general-purpose American National Standard Taper Pipe internal threads, checking functional size and hand-tight engagement across the standard pipe sizes from 1/16-27 upward. NPTF Taper Pipe Plug Gage. The full dryseal family in one product — L1 for hand-tight engagement, L3 for wrench engagement and taper, and the 6-step for crest and root truncation. NPTF threads seal without compound, so the truncation check is not optional. ANPT Thread Plug Gage. Aeronautical National Form Taper Pipe gages manufactured to SAE AS71051 , in L-1, L-3 and 6-step, for pipe threads in aerospace fluid and pneumatic systems. What taper pipe gages inspect Hand-tight engagement (L1) Wrench engagement (L3 / L2) Thread taper Crest truncation (6-step) Root truncation Functional size NPT / NPTF / ANPT forms Dryseal sealing threads Which gage checks what A taper pipe thread is not accepted on a single check. Each gage in the family answers a different question, which is why they are ordered together. Gage What it checks Why it matters L1 Functional size — hand-tight engagement Confirms the thread will start and seat to the correct standoff L3 (plug) / L2 (ring) Wrench engagement and taper Confirms en