{"product_id":"boka-er20-prazisionsspannzangen-0-01mm-rundlauf-grosse-2-13mm","title":"Boka ER20 precision collets 0.01mm concentricity size 2-13mm ","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cmeta content=\"width=device-width, initial-scale=1.0\" name=\"viewport\"\u003e\u003c\/p\u003e\n\n\u003ch1\u003e Boka ER20 precision collets 0.01mm concentricity size 2-13mm\u003c\/h1\u003e\n\n\u003cp\u003e Discover the \u003cb\u003eBoka ER20 high-precision collet series\u003c\/b\u003e . Made of \u003cb\u003ehardened 65Mn steel\u003c\/b\u003e , they offer \u003cb\u003e0.01mm concentricity\u003c\/b\u003e (4×D) and are \u003cb\u003ecompatible with all ER20 collet chucks\u003c\/b\u003e . Designed for milling, turning, and drilling machines, they feature \u003cb\u003edurability\u003c\/b\u003e and \u003cb\u003eincreased wear resistance\u003c\/b\u003e . This is achieved through \u003cb\u003ethermal aging\u003c\/b\u003e and \u003cb\u003ecryogenic treatment\u003c\/b\u003e . Optimal performance is ensured by full tool shank insertion.\u003c\/p\u003e\n\n \u003cp\u003e\u003ca href=\"https:\/\/www.bokatools.de\/products\/boka-praezisions-spannzangen-set-0-01mm-rundlauf-er16-er20-er25-er32-er40-65mn\" style=\"color: #007bff; text-decoration: underline;\"\u003eInterested in a complete set? Check out our ER series set here.\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch2\u003e Product advantages\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cb\u003eHigh concentricity:\u003c\/b\u003e Our Boka ER20 collets offer a concentricity of less than 0.01 mm (measured at 4×D), enabling high tool concentricity and reduced machining errors. Ideal for precise applications.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cb\u003eQuality material \u0026amp; hardening:\u003c\/b\u003e Manufactured from high-quality, alloyed 65Mn spring steel and fully hardened. This ensures high strength, elasticity, and a long service life of the collet under demanding conditions.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cb\u003eImproved durability through process:\u003c\/b\u003e Each collet undergoes a thermal aging process to eliminate grinding stresses and a comprehensive cryogenic treatment to increase wear resistance and dimensional stability.\u003c\/li\u003e\n\n\u003cli\u003e \n\u003cb\u003eSecure tool holding:\u003c\/b\u003e Specially designed for cylindrical tool shanks. For optimal clamping performance and tool life, the tool shank should always be fully inserted into the collet.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cb\u003eStandard-compliant compatibility:\u003c\/b\u003e Boka ER20 collets comply with industry standards and are compatible with common ER20 collet chucks. This offers a flexible solution for your existing machines and tools.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Technical data \u003c\/h2\u003e\n\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0505\/9503\/7346\/files\/ER20-para-pic.png\" alt=\"Technical drawing\" style=\"max-width: 1000px; width: 100%; height: auto;\"\u003e\u003c\/p\u003e\n\n\u003cdiv class=\"table-wrapper\"\u003e\n\n\u003ctable\u003e\n\n\u003cthead\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e Article\u003c\/th\u003e\n\n\u003cth\u003e ER20-2\u003c\/th\u003e\n\n\u003cth\u003e ER20-3\u003c\/th\u003e\n\n\u003cth\u003e ER20-4\u003c\/th\u003e\n\n\u003cth\u003e ER20-5\u003c\/th\u003e\n\n\u003cth\u003e ER20-6\u003c\/th\u003e\n\n\u003cth\u003e ER20-7\u003c\/th\u003e\n\n\u003cth\u003e ER20-8\u003c\/th\u003e\n\n\u003cth\u003e ER20-9\u003c\/th\u003e\n\n\u003cth\u003e ER20-10\u003c\/th\u003e\n\n\u003cth\u003e ER20-11\u003c\/th\u003e\n\n\u003cth\u003e ER20-12\u003c\/th\u003e\n\n\u003cth\u003e ER20-13\u003c\/th\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/thead\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e SKU\u003c\/td\u003e\n\n\u003ctd\u003e 56030801\u003c\/td\u003e\n\n\u003ctd\u003e 56030802\u003c\/td\u003e\n\n\u003ctd\u003e 56030803\u003c\/td\u003e\n\n\u003ctd\u003e 56030804\u003c\/td\u003e\n\n\u003ctd\u003e 56030805\u003c\/td\u003e\n\n\u003ctd\u003e 56030806\u003c\/td\u003e\n\n\u003ctd\u003e 56030807\u003c\/td\u003e\n\n\u003ctd\u003e 56030808\u003c\/td\u003e\n\n\u003ctd\u003e 56030809\u003c\/td\u003e\n\n\u003ctd\u003e 56030810\u003c\/td\u003e\n\n\u003ctd\u003e 56030811\u003c\/td\u003e\n\n\u003ctd\u003e 56030812\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e Model\u003c\/td\u003e\n\n\u003ctd\u003e ER20-2mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-3mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-4mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-5mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-6mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-7mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-8mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-9mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-10mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-11mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-12mm\u003c\/td\u003e\n\n\u003ctd\u003e ER20-13mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e Size (d)\u003c\/td\u003e\n\n\u003ctd\u003e 2mm\u003c\/td\u003e\n\n\u003ctd\u003e 3mm\u003c\/td\u003e\n\n\u003ctd\u003e 4mm\u003c\/td\u003e\n\n\u003ctd\u003e 5mm\u003c\/td\u003e\n\n\u003ctd\u003e 6mm\u003c\/td\u003e\n\n\u003ctd\u003e 7mm\u003c\/td\u003e\n\n\u003ctd\u003e 8mm\u003c\/td\u003e\n\n\u003ctd\u003e 9mm\u003c\/td\u003e\n\n\u003ctd\u003e 10mm\u003c\/td\u003e\n\n\u003ctd\u003e 11mm\u003c\/td\u003e\n\n\u003ctd\u003e 12mm\u003c\/td\u003e\n\n\u003ctd\u003e 13mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e clamping area\u003c\/td\u003e\n\n\u003ctd\u003e 2mm - 1mm\u003c\/td\u003e\n\n\u003ctd\u003e 3mm - 2mm\u003c\/td\u003e\n\n\u003ctd\u003e 4mm - 3mm\u003c\/td\u003e\n\n\u003ctd\u003e 5mm - 4mm\u003c\/td\u003e\n\n\u003ctd\u003e 6mm - 5mm\u003c\/td\u003e\n\n\u003ctd\u003e 7mm - 6mm\u003c\/td\u003e\n\n\u003ctd\u003e 8mm - 7mm\u003c\/td\u003e\n\n\u003ctd\u003e 9mm - 8mm\u003c\/td\u003e\n\n\u003ctd\u003e 10mm - 9mm\u003c\/td\u003e\n\n\u003ctd\u003e 11mm - 10mm\u003c\/td\u003e\n\n\u003ctd\u003e 12mm - 11mm\u003c\/td\u003e\n\n\u003ctd\u003e 13mm - 12mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e Diameter (D)\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\u003ctd\u003e 21mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e Total length (L)\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n \u003ctd\u003e31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\u003ctd\u003e 31mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e Concentricity\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\u003ctd\u003e ≤ 0.01mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e form\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\u003ctd\u003e Around\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e Material type\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\u003ctd\u003e Alloy Steel\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e Packaging dimensions (mm)\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\u003ctd\u003e 25*25*35\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e Gross weight (kg)\u003c\/td\u003e\n\n\u003ctd\u003e 0.04\u003c\/td\u003e\n\n\u003ctd\u003e 0.04\u003c\/td\u003e\n\n\u003ctd\u003e 0.04\u003c\/td\u003e\n\n\u003ctd\u003e 0.04\u003c\/td\u003e\n\n\u003ctd\u003e 0.04\u003c\/td\u003e\n\n\u003ctd\u003e 0.04\u003c\/td\u003e\n\n\u003ctd\u003e 0.03\u003c\/td\u003e\n\n\u003ctd\u003e 0.03\u003c\/td\u003e\n\n\u003ctd\u003e 0.03\u003c\/td\u003e\n\n\u003ctd\u003e 0.03\u003c\/td\u003e\n\n\u003ctd\u003e 0.03\u003c\/td\u003e\n\n\u003ctd\u003e 0.02 \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\u003cstyle\u003e\n    body {\n      font-family: Arial, sans-serif;\n      line-height: 1.6;\n      padding: 16px;\n      color: #333;\n      font-size: 16px;\n    }\n\n    h1 {\n      font-size: 22px;\n      font-weight: bold;\n    }\n\n    h2 {\n      font-size: 20px;\n      font-weight: bold;\n      margin-top: 28px;\n    }\n\n    h3 {\n      font-size: 18px;\n      font-weight: bold;\n      margin-top: 24px;\n    }\n\n    img {\n      max-width: 100%;\n      height: auto;\n      border-radius: 8px;\n      box-shadow: rgba(0, 0, 0, 0.08) 0px 3px 6px,\n                  rgba(0, 0, 0, 0.12) 0px 3px 6px;\n      margin: 12px 0;\n    }\n\n    .table-wrapper {\n      overflow-x: auto;\n      margin: 12px 0;\n      border-radius: 8px;\n      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);\n      border: 1px solid #ddd;\n      position: relative;\n      z-index: 1;\n    }\n\n    table {\n      width: 100%; \/* 允许表格在有足够空间时自动扩展 *\/\n      border-collapse: collapse;\n      border-spacing: 0;\n      \/* 这里不再设置min-width，让内容决定宽度 *\/\n    }\n\n    th, td {\n      padding: 10px 12px;\n      border: 1px solid #ddd;\n      text-align: center;\n      background-color: #fff;\n    }\n\n    \/* 默认数据列字体大小，比body默认字体小1号 (16px -\u003e 15px) *\/\n    td {\n      font-size: 15px; \n    }\n\n    th {\n      background-color: #f2f2f2;\n      font-weight: bold;\n    }\n\n    tr:nth-child(even) td {\n      background-color: #fafafa;\n    }\n\n    \/* 首列的特殊样式 - 标题和数据行 *\/\n    th:first-child,\n    td:first-child {\n      position: sticky;\n      left: 0;\n      z-index: 2; \/* 确保在滚动时覆盖其他单元格 *\/\n      background-color: #f2f2f2;\n      box-shadow: 1px 0 0 0 #ddd;\n      font-weight: bold; \/* 保持首列字体加粗 *\/\n      min-width: 120px; \/* 首列的最小宽度设为120px *\/\n      font-size: 16px; \/* 首列字体保持不变 *\/\n    }\n\n    \/* 其他数据列的最小宽度 *\/\n    th:not(:first-child),\n    td:not(:first-child) {\n        min-width: 95px; \/* 其他数据列的最小宽度设为95px *\/\n    }\n\n    tr:nth-child(even) td:first-child {\n      background-color: #eaeaea;\n    }\n\n    \/* 确保非首列的数据单元格字体小1号 *\/\n    td:not(:first-child) {\n        font-size: 15px; \n    }\n\n    \/* 针对屏幕宽度小于等于700px时的媒体查询\n       这里不再需要额外的媒体查询来设置min-width，因为td\/th上的min-width已经会生效\n       如果表格整体宽度超出，overflow-x: auto 会自动提供滚动条。\n    *\/\n    @media (max-width: 768px) { \/* 调整为768px，与您body的媒体查询保持一致 *\/\n      body {\n        font-size: 15px;\n        padding: 12px;\n      }\n\n      h1 {\n        font-size: 20px;\n      }\n\n      h2 {\n        font-size: 18px;\n      }\n\n      h3 {\n        font-size: 16px;\n      }\n    }\n  \u003c\/style\u003e","brand":"GEM Maschinen","offers":[{"title":"ER20-2mm","offer_id":52237883736404,"sku":"56030801","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-3mm","offer_id":52237883769172,"sku":"56030802","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-4mm","offer_id":52237883801940,"sku":"56030803","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-5mm","offer_id":52237883834708,"sku":"56030804","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-6mm","offer_id":52237883867476,"sku":"56030805","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-7mm","offer_id":52237883900244,"sku":"56030806","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-8mm","offer_id":52237883933012,"sku":"56030807","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-9mm","offer_id":52237883965780,"sku":"56030808","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-10mm","offer_id":52237883998548,"sku":"56030809","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-11mm","offer_id":52237884031316,"sku":"56030810","price":8.06,"currency_code":"EUR","in_stock":true},{"title":"ER20-12mm","offer_id":52237884064084,"sku":"56030811","price":8.06,"currency_code":"EUR","in_stock":false},{"title":"ER20-13mm","offer_id":52237884096852,"sku":"56030812","price":8.06,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0505\/9503\/7346\/files\/ER20-2-01.jpg?v=1752229215","url":"https:\/\/gem-europe.myshopify.com\/products\/boka-er20-prazisionsspannzangen-0-01mm-rundlauf-grosse-2-13mm","provider":"GEM Maschinen GmbH","version":"1.0","type":"link"}