Push-to-connect pneumatic fittings: tube OD 4 to 12 mm and 1/8 to 1/2 in with the thread sizes offered — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/push-to-connect-fitting-sizes/ (sheet CC BY 4.0) Basis: SMC KQ2H male connector series listings (metric and NPT inch ranges); numbers only Catalog version: 2026-10-20 Sizes: see table below - Push-to-connect (push-in, one-touch) fittings take tube by outside diameter: metric 4, 6, 8, 10, 12 (and 16) mm, inch 1/8, 5/32, 1/4, 5/16, 3/8, 1/2 in. The table lists the male threads SMC offers on its straight male connector KQ2H for each tube OD (metric: tapered R, ISO 7, or M5/M6; inch: NPT). A tube must match the OD to within the maker's tube tolerance; soft PU/nylon tubes in the same nominal OD are not interchangeable with hard ones. - Tube dimensions (OD, ID, wall) of PU tube are on the PU pneumatic tube page. 5/32 in is 3.97 mm, 1/4 in is 6.35 mm, 3/8 in is 9.53 mm: metric and inch tubes of similar size do not interchange (6 mm vs 1/4 in leaks or blows out). - Left out, no file: collet and cartridge bore, hex size and body length are in SMC's PDF catalogue (not readable here) and Festo/Legris tables were not checked; retail pages do not print them, so we publish no body. tube OD male threads offered (SMC KQ2H) 4 mm R1/8, R1/4, M5, M6 6 mm R1/8, R1/4, R3/8, M5, M6 8 mm R1/8, R1/4, R3/8 10 mm R1/8, R1/4, R3/8, R1/2 12 mm R1/4, R3/8, R1/2 16 mm R3/8, R1/2 1/8 in NPT 1/16, 1/8, 1/4 5/32 in NPT 1/16, 1/8, 1/4 1/4 in NPT 1/16, 1/8, 1/4, 3/8 5/16 in NPT 1/8, 1/4, 3/8 3/8 in NPT 1/8, 1/4, 3/8, 1/2 1/2 in NPT 1/4, 3/8, 1/2 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - SMC Pneumatics (distributor): KQ2H male connector, metric — web — Publisher's page; dimensions are facts — https://www.smcpneumatics.com/mkq2h.html - SMC Pneumatics (distributor): KQ2H male connector, inch tube, NPT — web — Publisher's page; dimensions are facts — https://www.smcpneumatics.com/newKQ2Hnpt.html No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=push-to-connect-fitting-sizes