{"product_id":"hss-boring-tool-set","title":"Proxxon HSS Internal Threading Tool Set — 6-Piece, Metric \u0026 Whitworth, 6mm Shank in Wooden Box (No. 24520)","description":"\u003cp\u003eCut internal threads in both metric and Whitworth standards. The Proxxon HSS internal threading tool set provides six boring cutters covering the two most common thread forms — 60° metric and 55° Whitworth — in three sizes each, giving you the flexibility to cut a wide range of internal thread sizes on the lathe. All six cutters are presented in a fitted wooden box and mount via a tool holder to the tool post of the PD 230\/E lathe.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e60° Metric inside thread cutters (3 pieces):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e3\/64\" (1.3mm) — for fine metric threads\u003c\/li\u003e\n\u003cli\u003e7\/64\" (2.65mm) — for medium metric threads\u003c\/li\u003e\n\u003cli\u003e5\/32\" (4.0mm) — for larger metric threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e55° Whitworth inside thread cutters (3 pieces):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e3\/64\" (1.3mm) — for fine Whitworth threads\u003c\/li\u003e\n\u003cli\u003e7\/64\" (2.65mm) — for medium Whitworth threads\u003c\/li\u003e\n\u003cli\u003e5\/32\" (4.0mm) — for larger Whitworth threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePieces:\u003c\/strong\u003e 6 cutters (3 metric + 3 Whitworth)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread angles:\u003c\/strong\u003e 60° (metric) and 55° (Whitworth\/BSW)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank diameter:\u003c\/strong\u003e 15\/64\" (6mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutter length:\u003c\/strong\u003e 3-3\/16\" (95mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e HSS (High Speed Steel)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible machine:\u003c\/strong\u003e Proxxon PD 230\/E (via tool holder mounted to tool post)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e Fitted wooden box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart No.:\u003c\/strong\u003e 24520\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eMetric vs. Whitworth — Which Do You Need?\u003c\/h2\u003e\n\u003cp\u003eThe 60° metric thread form is the international standard used in most modern engineering applications. The 55° Whitworth (BSW) form is the British standard, still widely used in older machinery, vintage equipment restoration, and some specialty applications. This set covers both, making it suitable for a broad range of threading work.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhich lathe is this compatible with?\u003c\/strong\u003e\u003cbr\u003eThese cutters are designed for the Proxxon PD 230\/E lathe, mounted via a tool holder to the tool post. Verify compatibility with other Proxxon lathe models before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs a tool holder included?\u003c\/strong\u003e\u003cbr\u003eNo — the cutters require a tool holder that mounts to the PD 230\/E tool post, sold separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between boring and threading tools?\u003c\/strong\u003e\u003cbr\u003eThese are specifically internal threading (boring) tools — they cut thread forms inside a pre-bored hole. They are not general-purpose boring bars for enlarging holes.\u003c\/p\u003e\n\n\u003ch2\u003eWorks Well With\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/precision-lathe-pd-250-e\"\u003eProxxon Precision Lathe PD 250\/E\u003c\/a\u003e — similar Proxxon lathe ecosystem (verify PD 230\/E compatibility)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/proxxon-cutter-set-with-tungsten-carbide-inserts-for-pd-250-e-and-pd-400-3-piece-no-24555\"\u003eProxxon Tungsten Carbide Insert Cutter Set for PD 250\/E (No. 24555)\u003c\/a\u003e — carbide turning tools for the Proxxon lathe range\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/proxxon-die-holder-for-round-dies-m3-to-m10-no-24082\"\u003eProxxon Die Holder for Round Dies — M3 to M10 (No. 24082)\u003c\/a\u003e — external threading companion for cutting outside threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eReturns can only be accepted for unused product in its original packaging. A copy of the original packing slip or invoice is required. For warranty claims please call 1-877-776-9966. Please see our return and refund policy \u003ca href=\"\/pages\/refund-policy\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cspan class=\"js-reveal\" data-reveal-target=\".js-reveal-container\"\u003eCalifornia Residents Prop 65 Information\u003c\/span\u003e\n\u003cdiv class=\"js-reveal-container\" data-reveal-mode=\"slide\"\u003e\n\u003cbr\u003e\u003cimg src=\"\/\/cdn.shopify.com\/s\/files\/1\/1643\/2529\/files\/exclamation-mark-24144_large.png?v=1511288737\" alt=\"\" width=\"16\" height=\"14\" border=\"0\" align=\"left\" style=\"margin: 6px 6px 0 0;\"\u003eWARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to \u003ca href=\"https:\/\/www.p65warnings.ca.gov\/\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e.\u003c\/div\u003e","brand":"Proxxon","offers":[{"title":"Default Title","offer_id":51230006771936,"sku":"24520","price":115.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0786\/3943\/1904\/files\/24520_ac94ba34-8842-45a7-98b8-14ea4c98847b.jpg?v=1774616294","url":"https:\/\/protoolhaus.com\/products\/hss-boring-tool-set","provider":"Pro Tool Haus","version":"1.0","type":"link"}