{"id":111,"date":"2026-09-10T10:00:00","date_gmt":"2026-09-10T06:30:00","guid":{"rendered":"https:\/\/sanatiblog.ir\/blog\/push-in-fittings-and-air-tube\/"},"modified":"2026-09-10T10:00:00","modified_gmt":"2026-09-10T06:30:00","slug":"push-in-fittings-and-air-tube","status":"publish","type":"post","link":"https:\/\/sanatiblog.ir\/fa\/blog\/push-in-fittings-and-air-tube\/","title":{"rendered":"\u0627\u062a\u0635\u0627\u0644 \u0641\u0634\u0627\u0631\u06cc \u0648 \u0634\u0644\u0646\u06af \u0628\u0627\u062f: \u0633\u0627\u06cc\u0632 \u0631\u0627 \u062f\u0631\u0633\u062a \u0628\u06af\u06cc\u0631\u06cc\u062f"},"content":{"rendered":"

Push-in fittings are the quick connectors on air lines: push the tube in and it holds; press the ring and it comes out. They are cheap, but a wrong size means a second trip to the market. Three things to know.<\/p>\n

1. Tube size is the outside diameter<\/h2>\n

Metric air tube is sold by its outside diameter: 4, 6, 8, 10 and 12 mm are the common sizes. Inch tube (1\/4″, 5\/16″…) looks almost the same but does not seal in a metric fitting. Do not mix them.<\/p>\n

2. The thread on the other end<\/h2>\n

Most fittings in Iran have BSP<\/strong> threads (written R or G): 1\/8, 1\/4, 3\/8 and 1\/2 inch. American machines use NPT<\/strong>, which looks very similar but does not seal with BSP. Small valves often use M5. If you are not sure, take the old fitting with you.<\/p>\n

3. Polyurethane or nylon tube<\/h2>\n
    \n
  • Polyurethane (PU):<\/strong> soft and flexible, easy to route around a machine. The usual choice.<\/li>\n
  • Nylon (PA):<\/strong> stiffer, takes more pressure and heat, keeps its shape on long straight runs.<\/li>\n<\/ul>\n

    Two tips<\/h2>\n

    Cut the tube square with a tube cutter, not a side cutter: a slanted cut leaks. And push the tube all the way in, past the first click, until it stops.<\/p>\n

    What to tell the seller: tube size, thread size and type, the shape (straight, elbow, tee) and whether you want a brass or plastic body.<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u0633\u0627\u06cc\u0632 \u0634\u0644\u0646\u06af\u060c \u0646\u0648\u0639 \u0631\u0632\u0648\u0647 \u0648 \u062c\u0646\u0633 \u0634\u0644\u0646\u06af\u060c \u062a\u0627 \u0642\u0637\u0639\u0647\u200c\u0647\u0627 \u0628\u0627\u0631 \u0627\u0648\u0644 \u062c\u0627 \u0628\u06cc\u0641\u062a\u0646\u062f.<\/p>\n","protected":false},"author":0,"featured_media":126,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-111","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts\/111","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/comments?post=111"}],"version-history":[{"count":0,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts\/111\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/media\/126"}],"wp:attachment":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/media?parent=111"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/categories?post=111"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/tags?post=111"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}