{"id":3446,"date":"2026-10-09T04:55:06","date_gmt":"2026-10-08T20:55:06","guid":{"rendered":"http:\/\/www.pdmtuban.com\/blog\/?p=3446"},"modified":"2026-10-09T04:55:06","modified_gmt":"2026-10-08T20:55:06","slug":"what-sizes-do-pph-fittings-come-in-4e72-a276bc","status":"publish","type":"post","link":"http:\/\/www.pdmtuban.com\/blog\/2026\/10\/09\/what-sizes-do-pph-fittings-come-in-4e72-a276bc\/","title":{"rendered":"What sizes do PPH fittings come in?"},"content":{"rendered":"

Hey there, if you\u2019re here digging into PPH fittings and wondering, \u201cWhat sizes do these things even come in?\u201d \u2014 you\u2019re not alone. I talk to plumbers, industrial maintenance guys, and DIYers all the time who stare at a parts catalog and go, \u201cWait, is this the right size for my job?\u201d As a PPH fittings supplier who\u2019s been in this game for over a decade, I\u2019ve heard that question more times than I can count, and I get it. PPH is polypropylene homopolymer, right? It\u2019s super durable for piping systems \u2014 chemicals, hot water, that stuff \u2014 but its sizing isn\u2019t like your standard copper pipe, and mixing up specs can lead to leaks, downtime, or a whole mess of headaches. Let\u2019s break this down like we\u2019re chatting over a coffee (or a energy drink, if it\u2019s 3pm, no judgment) so you don\u2019t have to guess next time. PPH Fittings<\/a><\/p>\n

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First off, let\u2019s get one thing straight: PPH fittings are sized two different ways, depending on what industry you\u2019re in, and that\u2019s where a lot of folks slip up. There\u2019s nominal pipe size (NPS) for US standard stuff, and metric, which is big in Europe, Asia, and most of the rest of the world. I\u2019ve had a customer come in last month asking for a \u201c2-inch elbow\u201d and we had to confirm \u2014 was that NPS, which is actually a bit different from the actual outer diameter, or the metric 50mm that\u2019s close but not the same? Let\u2019s start with metric because that\u2019s the most common across industrial projects these days, especially for chemical processing and water treatment, which are two of our biggest markets.<\/p>\n

Metric PPH fittings run from tiny micro sizes up to big heavy-duty ones. The smallest we carry is 16mm \u2014 that\u2019s for small-bore lines, like lab equipment or residential hot water recirculation loops where you don\u2019t need a ton of flow, just reliability. Next up is 20mm, super popular for small to mid-sized residential plumbing, and 25mm is the go-to for most residential main lines. We jump 5mm all the way up from there? Wait no, actually, 32mm is next, then 40mm, 50mm, 63mm, 75mm, 90mm, 110mm, 125mm, 140mm, 160mm, 200mm, 225mm, 250mm, 280mm, 315mm \u2014 and that\u2019s the big ones, right up to 315mm for industrial applications like chemical transfer lines or municipal water mains. Wait, I should mention that not every brand carries every size \u2014 as a supplier, we make sure we stock all the common ones, but if you need a super obscure size like 180mm, I can get it, it just takes a little lead time. Important note about metric sizes: the number is the outer diameter (OD) of the fitting, right? So if your pipe is 50mm OD, a 50mm PPH fitting will slide right on. That\u2019s straightforward, no math needed, which I love.<\/p>\n

Now for the US and Canadian folks \u2014 NPS sizes, which are based on the inner diameter (ID) of the pipe, not the outer. So a 1-inch NPS PPH fitting doesn\u2019t have a 1-inch OD; it\u2019s actually around 1.025 inches OD, which is why you can\u2019t just match a 1-inch copper pipe OD to a PPH NPS fitting. The NPS sizes we stock start at 1\/8 inch for tiny pneumatic lines, up to 12 inches for large industrial headers. Wait, let\u2019s list those out clearly so you don\u2019t mix them up: 1\/8\u201d, 1\/4\u201d, 3\/8\u201d, 1\/2\u201d, 3\/4\u201d, 1\u201d, 1 1\/4\u201d, 1 1\/2\u201d, 2\u201d, 2 1\/2\u201d, 3\u201d, 4\u201d, 5\u201d, 6\u201d, 8\u201d, 10\u201d, 12\u201d. That\u2019s standard NPS, and we also have schedule 80 and schedule 40 options for each size, right? Schedule is the wall thickness \u2014 schedule 40 is for general use, schedule 80 is thicker, for higher pressure or harsher chemicals. That\u2019s another thing people often overlook: same size, different schedule, different application. I once had a guy buy 4-inch schedule 40 PPH fittings for a 150 PSI chemical line, and I had to talk him into schedule 80 before he installed \u2014 saved him from a huge leak that would\u2019ve shut his plant down. Worth the awkward 10-minute chat, let me tell you.<\/p>\n

Wait, but it\u2019s not just straight sizes \u2014 PPH fittings come in all the shapes: elbows, tees, couplings, reducers, end caps, threaded adapters, flanges, you name it \u2014 and each shape has to match the pipe size, obviously. But here\u2019s the thing about reducers, which are super common: if you need to go from a 2-inch line to a 1-inch line, the reducer is sized for each end, right? So a 2×1 inch reducer coupling is for a 2-inch NPS pipe and a 1-inch NPS pipe. No mixing metric and NPS there, that\u2019s a hard rule \u2014 you can\u2019t hook a 50mm metric pipe to a 2-inch NPS pipe, not without an adapter, and even then you have to make sure the adapter is rated for the pressure and chemical. I\u2019ve seen guys try to force that once, and it split the fitting within a week. Never again.<\/p>\n

Now, what about pressure ratings? Because size doesn\u2019t mean squat if the fitting can\u2019t handle the pressure of your system. For example, a 90mm PPH elbow might have a 16 bar pressure rating at 20\u00b0C, but at 80\u00b0C, that drops to like 10 bar. So even if you get the size exactly right, if the pressure is too high for the temp, you\u2019ll have issues. That\u2019s why I always ask customers two things first: what size pipe are you using, and what\u2019s the operating temp and pressure of your line. Sizing is half the battle, the other half is making sure the spec matches your application.<\/p>\n

Wait, let\u2019s talk about less common sizes too, because I know some of you out there have weird projects. We\u2019ve had a customer a few months back who needed a 10mm PPH fitting for a lab line that carries corrosive acids \u2014 that\u2019s a micro size most suppliers don\u2019t stock, but we special-ordered it for him, no problem. And for the big industrial guys, we\u2019ve shipped 315mm PPH flanges for a food processing plant\u2019s water line \u2014 that\u2019s huge, you could fit a basketball through that, and it\u2019s rated for food grade, which is another spec people care about.<\/p>\n

Also, let\u2019s clear up a myth: some people think PPH fittings only come in \u201cstandard\u201d sizes, but no \u2014 when we\u2019re talking about fabricated PPH parts, not just injection-molded ones, we can make custom sizes. Like if you need a 275mm tee, that\u2019s not a standard off-the-shelf size, but we can weld it up from PPH sheet or pipe, as long as you send us the specs and the pressure rating. That\u2019s one of the perks of working with a small, flexible supplier like us instead of a big corporation \u2014 we don\u2019t just stick to the catalog.<\/p>\n

Wait, I should also mention how to measure your existing pipe or fitting if you\u2019re replacing something, because a lot of times people come to us with a broken fitting and just want an exact match. For metric, you just measure the outer diameter with a caliper or a tape measure \u2014 easy. For NPS, it\u2019s trickier because the OD isn\u2019t the same as the nominal size. So if you have a broken NPS fitting, measure the OD and then cross-reference: 1\/2 inch NPS is 0.840 inches OD, 3\/4 is 1.050 inches, 1 inch is 1.315 inches, that kind of thing. If you don\u2019t have a caliper, just shoot us a pic, and we can help you figure it out \u2014 that\u2019s part of the service, right? We\u2019re not just here to sell fittings, we\u2019re here to make sure you get the right one.<\/p>\n

Let me give you a quick example of a common project to put this all together. Say you\u2019re a plumber putting in a new water line for a residential house. The main water line coming in is 3\/4 inch NPS, the branches to the sinks are 1\/2 inch NPS, and you need elbows for the turns. So you\u2019d get 3\/4 inch 90-degree elbows and 1\/2 inch tees, schedule 40, since residential water pressure is around 40-60 PSI, which schedule 40 handles fine. If it was a commercial building, you\u2019d probably use schedule 80 for higher pressure, and sizes like 1 inch or 1 1\/2 inch for the main.<\/p>\n

Another example: a chemical plant moving hydrochloric acid, which is corrosive, so you need PPH (which is resistant to most acids, way better than PVC here). Let\u2019s say the line is 100mm metric, operating at 12 bar and 60\u00b0C. You\u2019d get 100mm schedule 80 PPH tees and couplings, rated for acid service, which is a different spec than general PPH. Size is 100mm, but the material rating is what makes it work for that application.<\/p>\n

Wait, let\u2019s address a pain point a lot of people have: suppliers who only carry standard sizes and make you wait 6 weeks for a custom one. As a PPH fittings supplier, we keep 90% of the most common sizes in stock at all times \u2014 metric 16mm up to 200mm, NPS 1\/8 inch up to 12 inches, schedule 40 and 80, all the main shapes \u2014 so you can get them next day if you need them in a pinch. We also have a sample program, so if you\u2019re not sure which size is right, you can order a small sample for cheap to test fitment before you buy a whole batch. That\u2019s something big box stores or online-only suppliers don\u2019t offer, and it\u2019s saved a lot of our customers from buying the wrong size.<\/p>\n

Now, let\u2019s talk about why size consistency matters. If you have a piping system with mismatched fitting sizes, you get flow restrictions, which mean you need a bigger pump, higher energy costs, and over time, the lines can build up pressure spots that lead to leaks or bursts. I had a customer a few years back who tried to save a few bucks by using a standard reducer instead of a lined one for a corrosive line, and it leaked within three months, costing him $50k in downtime and cleanup. Size is part of that, but also matching the reducer to the pipe schedule and material.<\/p>\n

Wait, should I mention the difference between socket fusion fittings and threaded fittings? Because size applies there too. Socket fusion fittings are sized for the OD, same as metric, so a 50mm socket fusion fitting fits a 50mm OD pipe, and you fuse them together \u2014 no threads, super strong. Threaded PPH fittings, on the other hand, are usually NPS, and you use thread sealant or Teflon tape to connect them. That\u2019s why it\u2019s important to know if you\u2019re doing fusion or threaded connections when you\u2019re ordering sizes \u2014 they\u2019re not interchangeable, even if the number looks close.<\/p>\n

Let me wrap this up so it\u2019s not a huge wall of text, which I know you\u2019re not here to read all day. The short version is: PPH fittings come in two main sizing standards \u2014 metric (OD-based, sizes from 16mm to 315mm for off-the-shelf, plus custom sizes) and NPS (ID-based, sizes from 1\/8 inch to 12 inches, schedule 40 and 80). They come in all common shapes, and we stock the sizes you need for most jobs, with special order for oddball sizes or custom specs. The key is to confirm both the size standard, schedule, and your application\u2019s pressure and temperature to avoid mistakes.<\/p>\n

<\/p>\n

If you\u2019re still not sure what size you need \u2014 whether you\u2019re replacing a broken fitting, planning a new line, or need a custom size for a weird project \u2014 hit us up. We can help you measure, cross-reference sizes, and make sure you get the exact fitting that works for your system. No confusing jargon, no hidden fees, just straightforward advice and the sizes you need, when you need them.<\/p>\n

PVDF Fittings<\/a> References:<\/p>\n

    \n
  1. Polypropylene (PP) Piping Systems: Sizing and Specification Guidelines, Plastics Industry Association, 2021.<\/li>\n
  2. ASME B36.19M-2020, Metric Schedule for Plastic Pipe and Fittings, American Society of Mechanical Engineers.<\/li>\n
  3. PPH Fittings Product Catalog, International Association of Piping Manufacturers, 2022.<\/li>\n
  4. Chemical Resistance Guidelines for Polypropylene Piping, National Association of Water Companies, 2020.<\/li>\n<\/ol>\n
    \n

    Xiamen Sanideng Plastics Industry Co., Ltd.<\/a>
    Xiamen Sanideng Plastics Industry Co., Ltd. is well-known as one of the leading pph fittings manufacturers and suppliers in China. Please feel free to buy or wholesale high quality pph fittings for sale here from our factory. For price consultation, contact us.
    Address: No.169, Tong Hong Road, Tong’an District, Xiamen, China
    E-mail: Sandy@sanking.cn
    WebSite:     https:\/\/www.sankingvalve.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey there, if you\u2019re here digging into PPH fittings and wondering, \u201cWhat sizes do these things … What sizes do PPH fittings come in?<\/span>Read more<\/a><\/p>\n","protected":false},"author":5,"featured_media":3446,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3409],"class_list":["post-3446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-pph-fittings-4fc0-a2bfbc"],"_links":{"self":[{"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/posts\/3446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/comments?post=3446"}],"version-history":[{"count":0,"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/posts\/3446\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/posts\/3446"}],"wp:attachment":[{"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/media?parent=3446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/categories?post=3446"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.pdmtuban.com\/blog\/wp-json\/wp\/v2\/tags?post=3446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}