{"id":9039,"date":"2026-10-20T15:23:18","date_gmt":"2026-10-20T07:23:18","guid":{"rendered":"https:\/\/xzfastener.com\/?p=9039"},"modified":"2026-10-20T15:23:22","modified_gmt":"2026-10-20T07:23:22","slug":"a194-2h-vs-2hm-nuts-ordering-inspection","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/it\/a194-2h-vs-2hm-nuts-ordering-inspection\/","title":{"rendered":"ASTM A194 2H vs 2HM Nuts: Ordering and Inspection Checks"},"content":{"rendered":"<style>.xz-batch-guide{max-width:900px;width:100%;margin:0 auto;line-height:1.8;color:#253747;overflow-wrap:anywhere}.xz-batch-guide h2{font-size:26px;line-height:1.35;margin:32px 0 16px}.xz-batch-guide p{margin:0 0 18px}.xz-batch-guide li{margin:9px 0}.xz-batch-guide a{text-decoration:underline}@media(max-width:767px){.xz-batch-guide h2{font-size:23px}.xz-batch-guide ul,.xz-batch-guide ol{padding-left:22px}}<\/style><div class=\"xz-batch-guide\"><p>An enquiry for \u201cA194 heavy hex nuts\u201d leaves an important question unanswered: which grade? For project buyers comparing 2H and 2HM, the grade affects more than the mark on the nut. It changes the requirements the supplier must meet and document.<\/p><h2>2HM does not mean a metric version of 2H<\/h2><p>The M in the grade designation 2HM should not be used to identify the thread system. Specify metric or inch threads separately, including the diameter, pitch and required fit. A nut described as 2HM still needs a complete dimensional and thread callout.<\/p><p>2H and 2HM have different proof-load and hardness requirements. Grade 2HM also has individual hardness-testing requirements. Compare the applicable standard edition and ordered size rather than copying one value from a general comparison chart.<\/p><h2>Order the nut against the approved assembly<\/h2><p>List the nut grade alongside the stud or bolt specification. Include the required number of nuts per assembly, any washers and the surface finish. A supplier should not replace a specified nut grade simply because another nut engages with the thread.<\/p><p>If your purchase list calls for B7M studs and 2HM nuts, keep both designations visible in the quotation and packing documents. Review any offered substitution through the project\u2019s approval process. See the <a href=\"https:\/\/xzfastener.com\/it\/b7-vs-b7m-stud-bolts-buyers-guide\/\">B7 versus B7M purchasing guide<\/a> for handling deviations.<\/p><h2>What to ask about hardness records<\/h2><p>Ask the supplier to confirm the test coverage required for the ordered grade and how the results are recorded. The report should make it possible to identify the tested supply, the test method and the acceptance basis. Do not accept a generic statement that \u201chardness is OK\u201d as a substitute for the agreed inspection evidence.<\/p><p>Where a project requires witnessed testing or third-party inspection, agree the inspection body, notice period and release procedure before the order proceeds. These arrangements can affect planning and should be visible in the quotation.<\/p><h2>Check thread fit after the specified finish<\/h2><p>State whether nuts are supplied plain or with a specified coating. Confirm the finished thread requirements with the supplier and include assembly checks where required by the purchase specification. Finish colour alone does not identify the nut grade or prove that the thread will assemble correctly.<\/p><p>Keep grades and batches segregated during packing. Labels should identify the purchase-order line, grade, size, quantity and relevant traceability reference. Use the <a href=\"https:\/\/xzfastener.com\/it\/oil-gas-fastener-receiving-checklist\/\">receiving checklist<\/a> to compare those labels with the delivered reports.<\/p><h2>Prepare an A194 nut RFQ<\/h2><p>Send the exact grade, standard edition, thread details, dimensions, finish and quantity. Include the mating stud specification and document requirements. Material inspection reports, dimensional reports, batch traceability and any EN 10204 or third-party requirements should be agreed for the specific supply.<\/p><p>Use the <a href=\"https:\/\/xzfastener.com\/it\/products\/a194-high-strength-heavy-hex-nuts-black-finish-metric-hexagon-nuts-m12-m14-m16-m18-m20-m22-m24-m27-m30-for-industrial-fastening\/\">A194 heavy hex nut page<\/a> to start your product enquiry, then <a href=\"https:\/\/xzfastener.com\/it\/home\/contact-us\/\">send the complete matched-set requirements<\/a> per la revisione.<\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>An enquiry for \u201cA194 heavy hex nuts\u201d leaves an important question unanswered: which grade? For project buyers comparing 2H and 2HM, the grade affects more than the mark on the nut. It changes the requirements the supplier must meet and document. 2HM does not mean a metric version of 2H The M in the grade [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[479],"tags":[],"class_list":["post-9039","post","type-post","status-publish","format-standard","hentry","category-fastener-knowledge-library"],"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/posts\/9039","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/comments?post=9039"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/posts\/9039\/revisions"}],"predecessor-version":[{"id":9040,"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/posts\/9039\/revisions\/9040"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/media?parent=9039"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/categories?post=9039"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/it\/wp-json\/wp\/v2\/tags?post=9039"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}