{"id":38,"date":"2026-10-05T20:12:06","date_gmt":"2026-10-05T12:12:06","guid":{"rendered":"http:\/\/runda-hitech.com\/?page_id=38"},"modified":"2026-10-05T21:09:37","modified_gmt":"2026-10-05T13:09:37","slug":"threaded-fittings","status":"publish","type":"page","link":"https:\/\/runda-hitech.com\/index.php\/products\/tube-fittings\/threaded-fittings\/","title":{"rendered":"Threaded Pipe &#038; Tube Fittings"},"content":{"rendered":"\n<div class=\"wp-block-cover alignfull rlok-hero\" style=\"min-height:430px;aspect-ratio:unset;\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\"><\/span><img decoding=\"async\" class=\"wp-block-cover__image-background\" alt=\"\" src=\"http:\/\/runda-hitech.com\/wp-content\/uploads\/2026\/10\/r-lok-threaded-fittings-1-1.jpg\" data-object-fit=\"cover\"\/><div class=\"wp-block-cover__inner-container has-global-padding is-layout-constrained wp-block-cover-is-layout-constrained\">\n<h1 class=\"wp-block-heading\">Threaded Pipe &amp; Tube Fittings<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Threaded pipe and tube fittings join instrument tubing, small-bore pipe and manifold ports without welding, so a line can be extended or repaired with hand tools. R-LOK supplies the family in 316 and 316L stainless steel with NPT threads from 1\/8 in to 1 in, and ISO 7\/1 or ISO 228 threads on request. Material certificates and dimensional inspection records ship with each order.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"\/index.php\/contact\/\">Request a quote<\/a><\/div>\n\n<div class=\"wp-block-button is-style-outline\"><a class=\"wp-block-button__link wp-element-button\" href=\"\/index.php\/products\/\">Browse products<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group rlok-body has-global-padding is-layout-constrained wp-container-core-group-is-layout-b8954cbe wp-block-group-is-layout-constrained\" style=\"border-radius:0px\">\n<p class=\"wp-block-paragraph\"><span class=\"rlok-fallback-nav\"><a href=\"\/index.php\/products\/\">Products<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/applications\/\">Applications<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/quality\/\">Quality<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/resources\/\">Resources<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/about\/\">About<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/contact\/\">Contact<\/a><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span class=\"rlok-bc\"><a href=\"\/index.php\/\">Home<\/a> &rsaquo; <a href=\"\/index.php\/products\/\">Products<\/a> &rsaquo; <a href=\"\/index.php\/products\/tube-fittings\/\">Tube Fittings<\/a> &rsaquo; <strong>Threaded Fittings<\/strong><\/span><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-6ac5c474 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"http:\/\/runda-hitech.com\/wp-content\/uploads\/2026\/10\/r-lok-threaded-fittings-2-1.jpg\" alt=\"316 stainless steel hex nipple with NPT male threads at both ends\" width=\"760\"\/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-6ac5c474 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Key features<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>316 and 316L stainless steel bodies, machined from solid bar<\/li>\n\n<li>NPT threads 1\/8 in to 1 in per ASME B1.20.1<\/li>\n\n<li>ISO 7\/1 taper and ISO 228 parallel threads, IHN-2G to IHN-16G<\/li>\n\n<li>Reducing parts such as IHRN-8N-4N (1\/2 in by 1\/4 in) and IRHB-12N-8N<\/li>\n\n<li>VCR-compatible ends -V4 (1\/4 in) and -V6 (3\/8 in) on listed bodies<\/li>\n\n<li>Extended nipples to a stated length, such as IHLN-8N-100L at 100 mm<\/li>\n<\/ul>\n<\/div>\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Parameter<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>Thread sizes<\/td><td>1\/8 in to 1 in NPT; codes -2N to -16N map six sizes<\/td><\/tr><tr><td>Straight lengths<\/td><td>19.1 mm for ICN-2N up to 97.7 mm for IRT-16N<\/td><\/tr><tr><td>Hex across flats<\/td><td>11.1 mm on 1\/8 in IH parts to 42.9 mm on 1 in<\/td><\/tr><tr><td>Sealing<\/td><td>metal-to-metal tapered NPT thread; no elastomer in the standard family<\/td><\/tr><tr><td>ISO 228 sealing<\/td><td>on a bonded washer, for joints re-made repeatedly<\/td><\/tr><tr><td>Pressure rating<\/td><td>not tabulated on pages 3-01 to 3-24; confirmed per size and material<\/td><\/tr><tr><td>Documents<\/td><td>packing list, material certificate for the heat, dimensional inspection records<\/td><\/tr><tr><td>Packing<\/td><td>individual bags, export cartons with desiccant; threads oiled, low-residue clean on request<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What the range covers<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The family covers straight and branching shapes: IHN hex nipples, IHLN extended nipples, IHRN reducing nipples, IFE and IME male elbows, ISE and IRSE male-to-female elbows, IMT and HTU male tees, and IFC crosses.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Series codes group the shapes: C short hex nipple, H hex nipple, R reducing nipple, E elbow, T tee, C cross, P plug or cap. Female parts include the IHC coupling, IPC cap and IPP plug; HEU, HFN, HFMT and HTU bodies take VCR ends.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Design and materials<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bodies are machined from solid bar rather than cast, which keeps the bore concentric and the wall thickness uniform around the thread. Catalogue photography marks the standard material 316L; 316 is the usual alternative.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A threaded joint has no elastomeric seal: the fine tapered NPT thread closes metal to metal, so the fitting is limited by the metal and not by an O-ring or gasket compound.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Selection and installation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Confirm the thread form and size on each port, the shape required, and whether the hex clears nearby pipework. A 1 in elbow needs about 45 mm of swing space; check the L, A or S dimension column.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Apply thread sealant or PTFE tape to male NPT threads, leaving the first two threads bare, and tighten with a wrench. Mixed stainless and carbon steel threads are worth avoiding in wet service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Standards referenced:<\/strong> NPT thread form per ASME B1.20.1; ISO 7\/1 taper and ISO 228 parallel threads on request; Dimensions per catalogue section 3-01 to 3-24, in mm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical duties:<\/strong> Instrument tubing at transmitters and gauges; Small-bore piping on hydraulic and pneumatic panels; Oil and gas skid sample and impulse lines; Chemical dosing and utility lines in petrochemical plants; Water treatment and process lines in pharmaceutical plants; Battery and hydrogen process skids.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Threaded pipe &amp; tube fitting model selection guide<\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Series \/ model<\/th><th>Size<\/th><th>Connection<\/th><th>Notes<\/th><\/tr><\/thead><tbody><tr><td>IHN-2N-2G<\/td><td>1\/8 NPT x 1\/8 ISO\/BSP parallel<\/td><td>NPT male to ISO parallel male<\/td><td>Hex male adapter<\/td><\/tr><tr><td>IHN-16N-16G<\/td><td>1 NPT x 1 ISO\/BSP parallel<\/td><td>NPT male to ISO parallel male<\/td><td>Hex male adapter; largest size in series<\/td><\/tr><tr><td>IHLN-8N<\/td><td>1\/2 NPT<\/td><td>NPT male, both ends<\/td><td>Long hex nipple; length A made to order, e.g. IHLN-8N-100L (A = 100 mm)<\/td><\/tr><tr><td>IHLN-16N<\/td><td>1 NPT<\/td><td>NPT male, both ends<\/td><td>Long hex nipple; largest size in series<\/td><\/tr><tr><td>IA-4G-4N<\/td><td>1\/4 ISO\/BSP parallel x 1\/4 NPT<\/td><td>ISO parallel male to NPT female<\/td><td>Adapter, male x female<\/td><\/tr><tr><td>IA-16G-16N<\/td><td>1 ISO\/BSP parallel x 1 NPT<\/td><td>ISO parallel male to NPT female<\/td><td>Adapter, male x female; largest size in series<\/td><\/tr><tr><td>IRA-8N-4N<\/td><td>1\/2 NPT x 1\/4 NPT<\/td><td>NPT female to NPT male<\/td><td>Reducing adapter, large female x small male<\/td><\/tr><tr><td>IRA-16N-12N<\/td><td>1 NPT x 3\/4 NPT<\/td><td>NPT female to NPT male<\/td><td>Reducing adapter; largest size in series<\/td><\/tr><tr><td>IHRC-8N-4N<\/td><td>1\/2 NPT x 1\/4 NPT<\/td><td>NPT female, both ends<\/td><td>Hex reducing coupling<\/td><\/tr><tr><td>IHRC-16N-12N<\/td><td>1 NPT x 3\/4 NPT<\/td><td>NPT female, both ends<\/td><td>Hex reducing coupling; largest size in series<\/td><\/tr><tr><td>IPG-8<\/td><td>1\/2 ISO parallel<\/td><td>ISO parallel flat gasket (copper)<\/td><td>ISO flat copper gasket<\/td><\/tr><tr><td>IPG-16<\/td><td>1 ISO parallel<\/td><td>ISO parallel flat gasket (copper)<\/td><td>ISO flat copper gasket; largest size in series<\/td><\/tr><tr><td>IRSE-8N-4N<\/td><td>1\/2 NPT x 1\/4 NPT<\/td><td>NPT female to NPT male, 90 deg<\/td><td>Reducing elbow, male x female<\/td><\/tr><tr><td>IRSE-16N-8N<\/td><td>1 NPT x 1\/2 NPT<\/td><td>NPT female to NPT male, 90 deg<\/td><td>Reducing elbow; largest size in series<\/td><\/tr><tr><td>IME-8N<\/td><td>1\/2 NPT<\/td><td>NPT male, both ends, 90 deg<\/td><td>Male elbow<\/td><\/tr><tr><td>IME-16N<\/td><td>1 NPT<\/td><td>NPT male, both ends, 90 deg<\/td><td>Male elbow; largest size in series<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Selection notes:<\/strong> Pages 3-03 to 3-18 print only model code, thread size and mm dimensions; working pressure, temperature basis, body material, seat\/packing and Cv are not published on these pages, so no material or rating is stated here. Ask the factory to confirm body material and pressure\/temperature ratings before this table is published; the sections divider page (page061) shows a 316L marking on one photographed fitting, but no material specification table accompanies it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Catalogue reference 3-03, 3-04, 3-07, 3-08, 3-11, 3-12, 3-17, 3-18. Confirm the final rating against the data sheet issued with your order.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>See also:<\/strong> <a href=\"\/index.php\/products\/tube-fittings\/double-ferrule-fittings\/\">Double Ferrule Fittings<\/a> &middot; <a href=\"\/index.php\/products\/tube-fittings\/high-purity-weld-fittings\/\">High Purity Weld Fittings<\/a> &middot; <a href=\"\/index.php\/products\/tube-fittings\/\">Tube Fittings<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Which thread standard is used, NPT or BSP?<\/summary>\n<p class=\"wp-block-paragraph\">The standard catalogue line is NPT to ASME B1.20.1, in 1\/8 to 1 in. ISO 7\/1 taper threads and ISO 228 parallel threads are available on request, and the IHN series includes ISO parallel Pipe thread columns, so state the requirement when enquiring.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What is the pressure rating of these fittings?<\/summary>\n<p class=\"wp-block-paragraph\">Catalogue tables on pages 3-01 to 3-24 give dimensions only, with no pressure or temperature column. A threaded joint is also limited by the mating pipe and by how it is made up, so ratings are confirmed for the exact size, material and thread combination.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What documents, minimum order and lead time apply?<\/summary>\n<p class=\"wp-block-paragraph\">Minimum order quantities and lead times depend on how many catalogue lines the order touches; a mixed order ships as one consignment. Quotes follow catalogue part numbers, or send a line list and we map each item to a series code.<\/p>\n<\/details>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull rlok-cta has-global-padding is-layout-constrained wp-container-core-group-is-layout-c4390f02 wp-block-group-is-layout-constrained\" style=\"border-radius:0px\">\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-container-core-group-is-layout-b097105c wp-block-group-is-layout-constrained\" style=\"border-radius:0px\">\n<h2 class=\"wp-block-heading\">Request a quote or technical clarification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Send us the model, size, material and quantity you need &mdash; or a photo of the existing part. We reply with a quotation, availability and the applicable documents, usually within one working day.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"mailto:nimo@runda-hitech.com\">Email nimo@runda-hitech.com<\/a><\/div>\n\n<div class=\"wp-block-button is-style-outline\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/wa.me\/8613657416007\">WhatsApp +86 136 5741 6007<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Tel \/ WhatsApp: +86 136 5741 6007 &middot; Email: nimo@runda-hitech.com<\/p>\n<\/div>\n<\/div>\n\n\n\n<style>img{max-width:100%;height:auto}.wp-block-table{max-width:100%}.rlok-bc{display:block;font-size:13px;letter-spacing:.01em;color:#5a6b7d;margin:0 0 26px}.rlok-bc a{color:#0b2545;text-decoration:none}.rlok-bc a:hover{color:#c8102e;text-decoration:underline}.rlok-bc strong{color:#0b2545}.rlok-fallback-nav{display:block;border-bottom:1px solid #dde3ea;padding-bottom:12px;margin:0 0 18px;font-size:14.5px;font-weight:600}.rlok-fallback-nav a{color:#0b2545;text-decoration:none}.rlok-fallback-nav a:hover{color:#c8102e;text-decoration:underline}@media (max-width:782px){.rlok-hero{min-height:330px!important;padding-left:18px!important;padding-right:18px!important}.rlok-hero h1{font-size:26px;line-height:1.22}.rlok-hero p{font-size:15.5px}.rlok-body{padding:30px 18px 12px!important}.rlok-cta{padding:38px 18px!important}.rlok-cta h2{font-size:22px}.rlok-bc{font-size:12.5px;margin-bottom:18px}.wp-block-table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}.wp-block-table table{min-width:520px;font-size:13px}.wp-block-table th,.wp-block-table td{padding:7px 9px}.wp-block-columns{gap:1.1rem;margin-bottom:1.3rem}.wp-block-button{width:100%}.wp-block-button__link{width:100%;text-align:center}h2.wp-block-heading{font-size:22px}h3.wp-block-heading{font-size:19px}.wp-block-details{padding:12px 14px}}<\/style><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"http:\/\/runda-hitech.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Products\", \"item\": \"http:\/\/runda-hitech.com\/products\/\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Tube Fittings\", \"item\": \"http:\/\/runda-hitech.com\/products\/tube-fittings\/\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Threaded Fittings\", \"item\": \"http:\/\/runda-hitech.com\/products\/tube-fittings\/threaded-fittings\/\"}]}<\/script>\n\n\n<!-- VERIFY BEFORE PUBLISHING: Pressure and temperature ratings for the threaded fitting family are not published in catalogue pages 3-01 to 3-24. Confirm whether RUNDA can supply a verified rating table per size and material, or issue ratings only case by case. | Confirm whether the standard production material is 316 or 316L. The catalogue part photograph is marked 316L while the general catalogue note refers to 316 stainless steel. | Confirm the exact ISO thread designations offered: the catalogue note covers ISO taper threads on request and the IHN table lists ISO parallel Pipe thread columns in 1\/8 to 1 in. Verify which of ISO 7\/1 (BSPT) and ISO 228 (BSPP) are actually stocked or made to order. | Confirm lead times and minimum order quantities for mixed orders made up of many catalogue lines. | Confirm that material certificates are supplied as standard and state which third-party or mill certificates can be arranged at extra cost. | Confirm whether a cleaned, low-residue finish is available for oxygen or semiconductor service, and what the cleaning specification and residue limit would be, since the catalogue shows only an oiled shipment condition. -->\n\n<!-- build: slug=threaded-fittings type=category keywords=threaded pipe fittings supplier, 316 stainless steel hex nipple exporter, NPT male reducing nipple 1\/2 to 1\/4, stainless steel threaded elbow BSPP, instrument pipe fittings export China, hex coupling and pipe cap 316L, threaded cross fitting 1\/2 NPT, extended hex nipple custom length, R-LOK threaded fittings, threaded fittings material certificate -->","protected":false},"excerpt":{"rendered":"<p>316 stainless threaded pipe and tube fittings, 1\/8 to 1 in NPT, nipples, elbows, tees and crosses. Export supply with mill certificates. Request a quote.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":64,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-38","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages\/38","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/comments?post=38"}],"version-history":[{"count":11,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages\/38\/revisions"}],"predecessor-version":[{"id":407,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages\/38\/revisions\/407"}],"up":[{"embeddable":true,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages\/64"}],"wp:attachment":[{"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/media?parent=38"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}