{"id":2971,"date":"2026-07-26T16:20:04","date_gmt":"2026-07-26T08:20:04","guid":{"rendered":"https:\/\/bravofabs.com\/8un-thread-specifications-chart\/"},"modified":"2026-08-04T17:14:38","modified_gmt":"2026-08-04T09:14:38","slug":"8un-thread-specifications-chart","status":"publish","type":"post","link":"https:\/\/bravofabs.com\/8un-thread-specifications-chart\/","title":{"rendered":"8UN Thread Specifications: Complete Diameter, TPI &#038; Tolerance Chart"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The 8UN (8-Thread Series) is a constant-pitch thread standard within the Unified Thread Standard (UTS) family, governed by ASME B1.1. Unlike UNC and UNF \u2014 where TPI changes with diameter \u2014 every 8UN thread from 1-1\/16&#8243; to 6&#8243; uses exactly <strong>8 threads per inch<\/strong>. This reference page provides the complete dimensional data you need for design, machining, and inspection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At <strong>BravoFabs<\/strong>, we machine 8UN threads daily on CNC lathes for oil &amp; gas flanges, pressure vessel studs, and heavy machinery components. This data is compiled from ASME B1.1 and verified against our production experience.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key Takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>8UN = constant 8 TPI<\/strong> across all diameters \u2014 one threading insert can machine multiple sizes<\/li>\n<li><strong>Diameter range: 1-1\/16&#8243; through 6&#8243;<\/strong> per ASME B1.1 Table 2 (selected sizes also defined above 6&#8243;)<\/li>\n<li><strong>Thread form: 60\u00b0 V-thread<\/strong> with 0.125&#8243; pitch (1\/8&#8243; per thread), flat root per UN profile<\/li>\n<li><strong>Pitch diameter tolerance<\/strong> available in classes 2A\/2B (general) and 3A\/3B (precision)<\/li>\n<li><strong>Primary industries:<\/strong> oil &amp; gas (API flanges), pressure vessels (ASME B16.5), heavy equipment, marine propulsion<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">8UN Complete Diameter and Pitch Data (ASME B1.1)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nominal Diameter<\/th><th>TPI<\/th><th>Pitch (in)<\/th><th>Basic Minor \u00d8 Internal (in)<\/th><th>Basic Minor \u00d8 External (in)<\/th><th>Tap Drill (in)<\/th><\/tr><\/thead><tbody><tr><td>1-1\/16&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>0.9375<\/td><td>0.9102<\/td><td>15\/16 (0.9375)<\/td><\/tr><tr><td>1-3\/16&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>1.0625<\/td><td>1.0352<\/td><td>1-1\/16 (1.0625)<\/td><\/tr><tr><td>1-5\/16&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>1.1875<\/td><td>1.1602<\/td><td>1-3\/16 (1.1875)<\/td><\/tr><tr><td>1-7\/16&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>1.3125<\/td><td>1.2852<\/td><td>1-5\/16 (1.3125)<\/td><\/tr><tr><td>1-9\/16&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>1.4375<\/td><td>1.4102<\/td><td>1-7\/16 (1.4375)<\/td><\/tr><tr><td>1-11\/16&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>1.5625<\/td><td>1.5352<\/td><td>1-9\/16 (1.5625)<\/td><\/tr><tr><td>1-13\/16&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>1.6875<\/td><td>1.6602<\/td><td>1-11\/16 (1.6875)<\/td><\/tr><tr><td>2&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>1.8750<\/td><td>1.8477<\/td><td>1-7\/8 (1.8750)<\/td><\/tr><tr><td>2-1\/4&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>2.1250<\/td><td>2.0977<\/td><td>2-1\/8 (2.1250)<\/td><\/tr><tr><td>2-1\/2&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>2.3750<\/td><td>2.3477<\/td><td>2-3\/8 (2.3750)<\/td><\/tr><tr><td>2-3\/4&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>2.6250<\/td><td>2.5977<\/td><td>2-5\/8 (2.6250)<\/td><\/tr><tr><td>3&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>2.8750<\/td><td>2.8477<\/td><td>2-7\/8 (2.8750)<\/td><\/tr><tr><td>3-1\/4&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>3.1250<\/td><td>3.0977<\/td><td>3-1\/8 (3.1250)<\/td><\/tr><tr><td>3-1\/2&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>3.3750<\/td><td>3.3477<\/td><td>3-3\/8 (3.3750)<\/td><\/tr><tr><td>3-3\/4&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>3.6250<\/td><td>3.5977<\/td><td>3-5\/8 (3.6250)<\/td><\/tr><tr><td>4&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>3.8750<\/td><td>3.8477<\/td><td>3-7\/8 (3.8750)<\/td><\/tr><tr><td>4-1\/4&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>4.1250<\/td><td>4.0977<\/td><td>4-1\/8 (4.1250)<\/td><\/tr><tr><td>4-1\/2&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>4.3750<\/td><td>4.3477<\/td><td>4-3\/8 (4.3750)<\/td><\/tr><tr><td>5&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>4.8750<\/td><td>4.8477<\/td><td>4-7\/8 (4.8750)<\/td><\/tr><tr><td>5-1\/2&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>5.3750<\/td><td>5.3477<\/td><td>5-3\/8 (5.3750)<\/td><\/tr><tr><td>6&#8243;<\/td><td>8<\/td><td>0.125<\/td><td>5.8750<\/td><td>5.8477<\/td><td>5-7\/8 (5.8750)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Note: Basic minor diameter for internal threads = nominal &#8211; 1.125 \u00d7 pitch. For external threads, the basic minor diameter includes the thread root truncation per ASME B1.1 Figure 2. Tap drill sizes are for approximately 75% thread engagement \u2014 adjust for material and application.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8UN Pitch Diameter Tolerances (Classes 2A\/2B and 3A\/3B)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pitch diameter is the most critical dimension for thread fit. For 8UN threads at 8 TPI, the pitch diameter tolerance per ASME B1.1 is:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Tolerance Class<\/th><th>Application<\/th><th>PD Tolerance (8 TPI)<\/th><th>Typical Use<\/th><\/tr><\/thead><tbody><tr><td><strong>2A<\/strong> (External)<\/td><td>General industrial<\/td><td>0.0089&#8243;<\/td><td>Standard studs, bolts<\/td><\/tr><tr><td><strong>2B<\/strong> (Internal)<\/td><td>General industrial<\/td><td>0.0106&#8243;<\/td><td>Standard nuts, tapped holes<\/td><\/tr><tr><td><strong>3A<\/strong> (External)<\/td><td>Precision \/ aerospace<\/td><td>0.0057&#8243;<\/td><td>High-precision studs<\/td><\/tr><tr><td><strong>3B<\/strong> (Internal)<\/td><td>Precision \/ aerospace<\/td><td>0.0069&#8243;<\/td><td>Aerospace nuts,\u7cbe\u5bc6\u87ba\u7eb9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For oil &amp; gas applications, most specifications call for Class 2A on studs and Class 2B on nuts. Class 3A\/3B is reserved for applications where thread fit must be controlled to prevent fatigue crack initiation \u2014 such as rotating equipment shafts and aerospace fasteners.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8UN Thread Engagement: Minimum Length Requirements<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For full-strength thread engagement (bolt breaking before thread stripping), the minimum engagement length depends on the material combination:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nut Material<\/th><th>Bolt Material<\/th><th>Min Engagement (\u00d7 diameter)<\/th><th>Min Engagement at 1-5\/16&#8243;-8UN<\/th><\/tr><\/thead><tbody><tr><td>Steel<\/td><td>Steel<\/td><td>0.8D<\/td><td>1.05&#8243;<\/td><\/tr><tr><td>Steel<\/td><td>Aluminum<\/td><td>1.5D<\/td><td>1.97&#8243;<\/td><\/tr><tr><td>Aluminum<\/td><td>Steel<\/td><td>2.0D<\/td><td>2.63&#8243;<\/td><\/tr><tr><td>Cast Iron<\/td><td>Steel<\/td><td>1.0D<\/td><td>1.31&#8243;<\/td><\/tr><tr><td>Stainless (304)<\/td><td>Stainless (304)<\/td><td>1.2D<\/td><td>1.58&#8243;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">At 8 TPI, each full turn advances the bolt 0.125&#8243;. For a 1-5\/16&#8243;-8UN steel nut on a steel stud, you need approximately 9 full turns for full-strength engagement. <strong>Less engagement = risk of thread stripping before bolt fracture.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common Industries and Applications for 8UN Threads<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Industry<\/th><th>Application<\/th><th>Governing Standard<\/th><\/tr><\/thead><tbody><tr><td>Oil &amp; Gas<\/td><td>API 6A flanges, wellhead studs, BOP bonnet bolts<\/td><td>API 6A, ASME B16.5<\/td><\/tr><tr><td>Pressure Vessels<\/td><td>Heat exchanger studs, manway bolts, vessel flange bolting<\/td><td>ASME BPVC Section VIII, ASME B16.5<\/td><\/tr><tr><td>Heavy Equipment<\/td><td>Hydraulic cylinder end caps, track pin retainers<\/td><td>Manufacturer spec (CAT, Komatsu)<\/td><\/tr><tr><td>Marine<\/td><td>Propeller shaft nuts, rudder stock bolts, hatch dog bolts<\/td><td>Classification society (ABS, DNV, LR)<\/td><\/tr><tr><td>Power Generation<\/td><td>Turbine casing studs, steam valve bonnet bolts<\/td><td>ASTM A193, ASTM A453<\/td><\/tr><tr><td>Aerospace<\/td><td>Landing gear bolts, engine mount studs<\/td><td>ASME B1.1, AMS specs<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">8UN Thread Machining: CNC Setup Parameters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For CNC lathe single-point threading of 8UN threads, we use the following starting parameters (adjust for material and insert grade):<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Parameter<\/th><th>Aluminum (6061)<\/th><th>Carbon Steel (1018\/1045)<\/th><th>Stainless (304\/316)<\/th><th>Alloy Steel (4140)<\/th><\/tr><\/thead><tbody><tr><td>Cutting Speed (SFM)<\/td><td>300-500<\/td><td>200-350<\/td><td>150-250<\/td><td>150-250<\/td><\/tr><tr><td>Number of Passes<\/td><td>8-12<\/td><td>12-16<\/td><td>14-18<\/td><td>14-20<\/td><\/tr><tr><td>Infeed per Pass<\/td><td>0.015&#8243; \u2192 0.002&#8243;<\/td><td>0.012&#8243; \u2192 0.001&#8243;<\/td><td>0.010&#8243; \u2192 0.001&#8243;<\/td><td>0.010&#8243; \u2192 0.0005&#8243;<\/td><\/tr><tr><td>Infeed Method<\/td><td>Modified flank<\/td><td>Modified flank<\/td><td>Modified flank<\/td><td>Radial (for hardness)<\/td><\/tr><tr><td>Insert Grade<\/td><td>Uncoated carbide<\/td><td>PVD TiAlN<\/td><td>PVD TiAlN<\/td><td>CVD Al\u2082O\u2083<\/td><\/tr><tr><td>Coolant<\/td><td>Soluble oil (5-8%)<\/td><td>Soluble oil (8-10%)<\/td><td>Heavy-duty (10-12%)<\/td><td>Heavy-duty (10-12%)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note on 8UN vs UNC tooling:<\/strong> Because 8UN is constant 8 TPI across all diameters, a single 8 TPI full-profile threading insert can machine any 8UN diameter \u2014 no insert changes between sizes. This is a significant production advantage for shops that machine multiple 8UN diameters in the same setup.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8UN Thread Inspection Checklist<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Every 8UN threaded part we produce at BravoFabs is verified against this checklist:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Go\/No-Go thread plug gauge<\/strong> (internal) or <strong>thread ring gauge<\/strong> (external) \u2014 primary acceptance test<\/li>\n<li><strong>Optical comparator at 20\u00d7<\/strong> \u2014 verify 60\u00b0 thread angle, root radius, crest flatness<\/li>\n<li><strong>Three-wire pitch diameter measurement<\/strong> \u2014 for precision Class 3A\/3B threads, measured to \u00b10.0002&#8243;<\/li>\n<li><strong>Visual inspection under magnification<\/strong> \u2014 check for torn threads, burrs, chatter marks<\/li>\n<li><strong>Material certification review<\/strong> \u2014 verify heat number and material grade match the PO requirements<\/li>\n<li><strong>Thread protector installation<\/strong> \u2014 for finished studs shipping to site, prevent handling damage<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">For more on thread series selection and interchangeability, see our guides on <strong><a href=\"https:\/\/bravofabs.com\/unc-vs-un-thread-comparison\/\">UNC vs UNF vs 8UN comparison<\/a><\/strong>, <strong><a href=\"https:\/\/bravofabs.com\/unc-8un-thread-interchangeability\/\">UNC and 8UN interchangeability rules<\/a><\/strong>, and <strong><a href=\"https:\/\/bravofabs.com\/manufacture-thread-in-metal-fabrication\/\">CNC thread manufacturing methods<\/a><\/strong>.<\/p>\n\n\n\n\n<h2 class=\"wp-block-heading\">8UN Thread Design Tips for Engineers<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Specify the Full Thread Callout on Drawings<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A complete 8UN thread callout on an engineering drawing should include: <strong>nominal diameter, threads per inch, series designation, tolerance class, and any special requirements<\/strong>. Example: &#8220;1-5\/16-8UN-2A&#8221; tells the machinist everything needed \u2014 diameter, TPI, series, and fit class. Ambiguous callouts like &#8220;8UN thread&#8221; or &#8220;8 TPI&#8221; without a diameter and tolerance class will result in questions from the shop, adding 1-2 days to your quote turnaround.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Choose the Right Tolerance Class: 2A\/2B vs 3A\/3B<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For 95% of industrial applications, <strong>Class 2A (external) and 2B (internal)<\/strong> are sufficient. These provide a running fit with adequate clearance for assembly and are the default for oil &amp; gas studs and nuts. Reserve <strong>Class 3A\/3B<\/strong> for applications where thread fit directly affects fatigue life \u2014 rotating shafts, aerospace fasteners, and\u7cbe\u5bc6\u5b9a\u4f4d\u87ba\u7eb9. Class 3 adds roughly 15-25% to machining cost due to tighter inspection requirements. If you are unsure which class to specify, see our <strong><a href=\"https:\/\/bravofabs.com\/unc-unf-8un-thread-selection-guide\/\">thread selection decision guide<\/a><\/strong> for a step-by-step framework.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Material Selection for 8UN Threaded Parts<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">8UN threads are most commonly machined in <strong>4140\/4142 alloy steel<\/strong> (ASTM A193 B7 for studs, ASTM A194 2H for nuts), <strong>304\/316 stainless steel<\/strong> (ASTM A193 B8\/B8M for corrosive service), and <strong>17-4 PH stainless<\/strong> (ASTM A564 for high-strength corrosive applications). For non-pressure applications, 1018\/1045 carbon steel with zinc plating is the economical choice. Aluminum 8UN threads are rare \u2014 at large diameters, aluminum lacks the thread strength needed for high-torque assembly. If weight reduction is critical, consider a steel threaded insert in an aluminum body.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for 8UN:<\/strong> 4140 heat-treated to 22-32 HRC \u2014 balances machinability with thread strength. <strong>Avoid:<\/strong> Unalloyed aluminum above 1&#8243; diameter \u2014 thread stripping risk exceeds acceptable margins at typical 8UN torque values.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Need 8UN Thread Machining? Get a Quote with Full Spec Review<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">BravoFabs produces custom 8UN threaded components from 1-1\/16&#8243; to 6&#8243; diameter in carbon steel, stainless, alloy steel, and aluminum. We provide full thread inspection reports with every batch \u2014 Go\/No-Go gauge results, optical comparator images, and material certifications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Upload your drawing with the complete thread callout<\/strong> (e.g., &#8220;2-1\/2-8UN-2A, ASTM A193 B7, with 3.1 material cert&#8221;). We&#8217;ll confirm the machining plan and inspection criteria in your quote. <a href=\"https:\/\/bravofabs.com\/contact\/\">Request a quote \u2192<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<div class=\"wp-block-group has-light-gray-background-color has-background is-layout-flow wp-block-group-is-layout-flow\" style=\"border-color:#1e73be;border-width:2px;padding-top:20px;padding-right:24px;padding-bottom:20px;padding-left:24px\">\n<h3 class=\"wp-block-heading\">Need 8UN Threaded Parts? Free CNC Quote with Drawing Review<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Send us your drawing or STEP file and we&#8217;ll provide a detailed machining quote \u2014 including material recommendations, thread inspection plan, and delivery timeline. ISO-certified, serving industrial clients in DE\/US\/CA\/EU.<\/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 has-white-color has-vivid-cyan-blue-background-color has-text-color has-background wp-element-button\" href=\"https:\/\/bravofabs.com\/contact\/\" style=\"border-radius:6px\">Request a Quote Now \u2192<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-container-core-group-is-layout-cbfb3306 wp-block-group-is-layout-constrained\" style=\"border-left-color:#2563eb;border-left-width:4px;border-left-style:solid;background-color:#f0f4ff;margin-top:32px;margin-bottom:0;padding-top:12px;padding-bottom:12px;padding-left:20px;padding-right:24px\">\n\n<h4 class=\"wp-block-heading\" style=\"font-size:15px;font-style:normal;font-weight:700;line-height:1.4;margin-top:0;margin-bottom:8px\">\ud83d\udd17 Related Thread &amp; Manufacturing Resources<\/h4>\n\n\n\n<ul class=\"wp-block-list\" style=\"font-size:14px;line-height:1.7;padding-left:18px\">\n<li><strong><a href=\"https:\/\/bravofabs.com\/8un-and-unc-thread-series\/\">8UN vs UNC Thread Series: Complete Comparison Guide<\/a><\/strong> \u2014 pillar reference<\/li>\n<li><strong><a href=\"https:\/\/bravofabs.com\/unc-8un-thread-interchangeability\/\">Can UNC Replace 8UN? Thread Interchangeability Guide<\/a><\/strong> \u2014 bolt substitution rules<\/li>\n<li><strong><a href=\"https:\/\/bravofabs.com\/unc-unf-8un-thread-selection-guide\/\">UNC vs UNF vs 8UN: Thread Selection Guide<\/a><\/strong> \u2014 decision framework for engineers<\/li>\n<li><strong><a href=\"https:\/\/bravofabs.com\/manufacture-thread-in-metal-fabrication\/\">How to Manufacture Thread in Metal Fabrication<\/a><\/strong> \u2014 CNC threading methods<\/li>\n<li><strong><a href=\"https:\/\/bravofabs.com\/cnc-turning-service\/\">CNC Turning Service<\/a><\/strong> \u2014 single-point threading for shafts and cylindrical parts<\/li>\n<\/ul>\n\n<\/div>\n<div class=\"rs-section\"><div class=\"rs-container\"><h2>Explore Related Manufacturing Services<\/h2><div class=\"rs-grid\"><div class=\"rs-card\"><a href=\"\/quality-control-in-metal-fabrication\/\">Quality Control in Metal Fabrication<\/a><p>QC processes, inspection tools &amp; CMM verification guide.<\/p><\/div><div class=\"rs-card\"><a href=\"\/cnc-turning-service\/\">CNC Turning Services<\/a><p>Precision turned parts. UN, UNC, metric threads.<\/p><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>The 8UN (8-Thread Series) is a constant-pitch thread standard within the Unified Thread Standard (UTS) family, governed by ASME B1.1. Unlike UNC and UNF \u2014 where TPI changes with diameter \u2014 every 8UN thread from 1-1\/16&#8243; to 6&#8243; uses exactly 8 threads per inch. This reference page provides the complete dimensional data you need for [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"8UN Thread Specs: Diameter, TPI & Tolerance Chart | BravoFabs","_seopress_titles_desc":"Complete 8UN thread reference: diameter chart, TPI data, pitch diameter tolerances (Classes 2A\/2B and 3A\/3B), thread engagement requirements, and CNC setup parameters. 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