{"title":"ER Collet Chuck Sets","description":"\u003cp data-start=\"1911\" data-end=\"2346\"\u003eBrowse our ER collet chuck sets for milling machines and compatible R8 spindle systems. This collection includes ER25, ER32, and ER40 R8 shank milling collet chucks, along with matching spanners and collet set options. Designed for precise toolholding, these collet chuck holders are commonly used for milling, drilling, and machining applications that require secure clamping of end mills, drill bits, and other cutting tools.\u003c\/p\u003e","products":[{"product_id":"er32-collet-chuck-with-collets","title":"ER32 Collet Set with R8 Chuck — 11pc Metric Kit for Mills","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis ER32 collet set pairs an R8 shank collet chuck with 11 metric spring collets (Φ3 mm–Φ20 mm) in one ready-to-install kit. The R8 shank fits directly into Bridgeport-style mill spindles and secures with the standard 7\/16\"-20 UNF drawbar. Collets cover the full size range a hobbyist or small-shop machinist reaches for most: 3 mm through 20 mm in stepped increments, plus the collet nut and ER32 spanner wrench.\u003c\/p\u003e\n\u003cp\u003eBuying the chuck body and collets as a matched ER32 collet set removes the guesswork of sourcing separate ER32 components. Every piece is pre-confirmed to the ER32 standard before shipping from our Toledo, OH warehouse.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e11-piece collet set\u003c\/strong\u003e: Φ3, Φ4, Φ5, Φ6, Φ8, Φ10, Φ12, Φ14, Φ16, Φ18, Φ20 mm — covers standard metric end mill and drill shank sizes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR8 shank collet chuck\u003c\/strong\u003e: 7\/16\"-20 UNF drawbar thread; fits all R8 spindle mills without modification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eER32 spring collets\u003c\/strong\u003e: 1 mm clamping range per collet; hardened alloy spring steel construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded ER32 spanner wrench\u003c\/strong\u003e: no hunting for the right wrench — collet nut tightening tool ships in the box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatched components\u003c\/strong\u003e: chuck body and collets verified to the same ER32 OD and taper spec before packaging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawbar-ready design\u003c\/strong\u003e: R8 taper accepts standard 7\/16\"-20 drawbar found on all Bridgeport-compatible spindles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCollet system: ER32\u003c\/li\u003e\n\u003cli\u003eChuck shank: R8 taper, 7\/16\"-20 UNF drawbar thread\u003c\/li\u003e\n\u003cli\u003eCollet set size: 11 pieces\u003c\/li\u003e\n\u003cli\u003eCollet range: Φ3 mm – Φ20 mm (metric stepped increments)\u003c\/li\u003e\n\u003cli\u003ePer-collet clamping range: 1 mm\u003c\/li\u003e\n\u003cli\u003eER32 collet OD: 33 mm (1.30\")\u003c\/li\u003e\n\u003cli\u003eER32 collet length: 40 mm (1.57\")\u003c\/li\u003e\n\u003cli\u003eMax ER32 chuck RPM: 8,000 RPM\u003c\/li\u003e\n\u003cli\u003eDrawbar thread: 7\/16\"-20 UNF\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis kit is designed for milling machines with an \u003cstrong\u003eR8 spindle taper\u003c\/strong\u003e. Confirmed compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBridgeport Series 1 \/ J-Head mill\u003c\/li\u003e\n\u003cli\u003eGrizzly G0704\u003c\/li\u003e\n\u003cli\u003eGrizzly G0731 \/ G0758\u003c\/li\u003e\n\u003cli\u003eSieg X2 \/ SX2 \/ X3\u003c\/li\u003e\n\u003cli\u003eAutobox MD100930 mini mill\u003c\/li\u003e\n\u003cli\u003eLittleMachineShop HiTorque mini mill\u003c\/li\u003e\n\u003cli\u003eTormach PCNC 440 \/ 770 \/ 1100\u003c\/li\u003e\n\u003cli\u003eHarbor Freight #44991 mini mill\u003c\/li\u003e\n\u003cli\u003ePrecision Matthews PM-25MV \/ PM-727\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot for lathes or drill presses\u003c\/strong\u003e: R8 is a mill spindle interface. If you need an ER32 chuck for an MT3 headstock, message us — we carry MT3 ER collet chucks separately.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1× ER32 R8 shank collet chuck body (7\/16\"-20 UNF drawbar thread)\u003c\/li\u003e\n\u003cli\u003e11× ER32 metric spring collets: Φ3, Φ4, Φ5, Φ6, Φ8, Φ10, Φ12, Φ14, Φ16, Φ18, Φ20 mm\u003c\/li\u003e\n\u003cli\u003e1× ER32 collet nut\u003c\/li\u003e\n\u003cli\u003e1× ER32 hook spanner wrench\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this fit my Bridgeport mill?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. Bridgeport Series 1 and J-Head mills use an R8 spindle taper with a 7\/16\"-20 UNF drawbar. This chuck installs the same way as any R8 tooling — insert the taper, thread the drawbar, snug it down.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What collet sizes are included — are they metric or imperial?\u003c\/strong\u003e\u003cbr\u003e\nA: The 11 collets are metric: Φ3, Φ4, Φ5, Φ6, Φ8, Φ10, Φ12, Φ14, Φ16, Φ18, and Φ20 mm. Each collet clamps a 1 mm range. If you primarily use imperial-shank end mills, see our ER32 imperial collet sets (sold separately).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do I need anything else to start using this kit?\u003c\/strong\u003e\u003cbr\u003e\nA: No. The kit includes the chuck body, all 11 collets, the collet nut, and the spanner wrench. You just need a mill with an R8 spindle and the standard 7\/16\"-20 drawbar (already installed on most R8 mills).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum tool shank diameter this system can hold?\u003c\/strong\u003e\u003cbr\u003e\nA: The largest collet in this set is Φ20 mm, which holds shanks from 19 to 20 mm. ER32 collets cap out at 20 mm maximum. For shanks up to 26 mm you would need an ER40 system.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this on a drill press or lathe headstock?\u003c\/strong\u003e\u003cbr\u003e\nA: No. The R8 taper is designed for milling machine spindles and requires a drawbar for secure clamping. Drill presses typically use MT2 or MT3 tapers, and mini lathe headstocks are usually MT3 — neither is compatible with R8.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Autobox\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShips from Toledo, OH\u003c\/strong\u003e — same or next business day; typical 3-5 day US delivery, no overseas wait\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-matched kit\u003c\/strong\u003e — chuck body and collets are from the same ER32 spec run, so you are not mixing tolerances from two separate orders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns, no restocking fee\u003c\/strong\u003e — if a collet size does not work for your tooling, send it back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUS-based customer support\u003c\/strong\u003e — email us a photo of your machine and we will confirm fit before you order\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Autobox","offers":[{"title":"Default Title","offer_id":46727469662345,"sku":"TJT-TJ320-ER32-R8","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0762\/4923\/5593\/files\/ER32ColletSetwithR8Chuck_11pcMetricKitforMills.png?v=1778736146"},{"product_id":"r8-shank-collet-chuck-spanner","title":"R8 ER32 Collet Chuck \u0026 Spanner — ER25 \/ ER32 \/ ER40 Options","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis R8 ER32 collet chuck and spanner set gives your Bridgeport-style or mini mill spindle a precise, quick-change tool holding system. Each kit includes the R8-shank collet chuck body and a matched hook spanner wrench — the two items you need to put the ER collet system to work. Available in ER25, ER32, and ER40 to match your tooling diameter range. The R8 shank has a 7\/16\"-20 UNF drawbar thread for use in standard R8 spindles.\u003c\/p\u003e\n\u003ch2\u003eAvailable Options\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eER25 — R8 Shank:\u003c\/strong\u003e Collet range 1–16 mm (1\/32\"–5\/8\"). Fits standard ER25 collets. Includes ER25 hook spanner. Price: $42.95.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eER32 — R8 Shank:\u003c\/strong\u003e Collet range 2–20 mm (3\/32\"–3\/4\"). Fits standard ER32 collets. Includes ER32 hook spanner. Price: $52.95.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eER40 — R8 Shank:\u003c\/strong\u003e Collet range 3–26 mm (1\/8\"–1\"). Fits standard ER40 collets. Includes ER40 hook spanner. Price: $68.95.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: ER collets are not included. Order the collet size that matches your tooling; see our ER collet sets listed separately.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eR8 shank with 7\/16\"-20 UNF drawbar thread — fits standard R8 spindles without modification\u003c\/li\u003e\n\u003cli\u003eHook spanner wrench included for each collet size — no separate wrench purchase required\u003c\/li\u003e\n\u003cli\u003eHardened and ground collet chuck body for concentricity at the collet seat\u003c\/li\u003e\n\u003cli\u003eChoice of ER25, ER32, or ER40 to match your end mill and drill bit diameter range\u003c\/li\u003e\n\u003cli\u003eDrawbar thread engagement verified to standard depth — addresses common fit issues seen with budget alternatives\u003c\/li\u003e\n\u003cli\u003eWorks with any brand of ER-standard collets (ER25, ER32, or ER40 as applicable)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank type:\u003c\/strong\u003e R8 taper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawbar thread:\u003c\/strong\u003e 7\/16\"-20 UNF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eER25 collet range:\u003c\/strong\u003e 1–16 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eER32 collet range:\u003c\/strong\u003e 2–20 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eER40 collet range:\u003c\/strong\u003e 3–26 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy tool steel, hardened\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrench included:\u003c\/strong\u003e Hook spanner matched to collet size (ER25, ER32, or ER40)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollets included:\u003c\/strong\u003e None — order separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eDesigned for mills with R8 spindle tapers. Confirmed compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBridgeport Series 1 \/ J-Head (R8 spindle)\u003c\/li\u003e\n\u003cli\u003eGrizzly G0731 \/ G0758 (R8 spindle)\u003c\/li\u003e\n\u003cli\u003eGrizzly G0704 (R8 spindle, mini mill)\u003c\/li\u003e\n\u003cli\u003eSieg X2 \/ SX2 \/ X3 (R8 spindle)\u003c\/li\u003e\n\u003cli\u003eHarbor Freight mini mill #44991 (R8 spindle)\u003c\/li\u003e\n\u003cli\u003eLittleMachineShop HiTorque mini mill (R8 spindle)\u003c\/li\u003e\n\u003cli\u003eAutobox MD100930 (R8 spindle)\u003c\/li\u003e\n\u003cli\u003ePrecision Matthews PM-25MV \/ PM-727 (R8 spindle)\u003c\/li\u003e\n\u003cli\u003eTormach PCNC 440 \/ 770 (R8 spindle)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot for use in lathe tailstocks, drill press spindles, or MT-taper machines. All listed machines confirmed in our compatibility database.\u003c\/p\u003e\n\u003cp\u003eUnsure if this fits your machine? Message us — we'll confirm before you order.\u003c\/p\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × R8-shank ER collet chuck body (ER25, ER32, or ER40 — per variant selected)\u003c\/li\u003e\n\u003cli\u003e1 × Hook spanner wrench matched to collet size\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eER collets are not included. Sold separately.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to buy collets separately?\u003c\/strong\u003e\u003cbr\u003eA: Yes. This kit includes the R8 collet chuck body and the hook spanner wrench. ER collets (ER25, ER32, or ER40) are sold separately. See our ER collet sets or our ER32 R8 chuck-with-collets bundle if you want everything in one order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which ER size should I choose — ER25, ER32, or ER40?\u003c\/strong\u003e\u003cbr\u003eA: Choose based on the largest tool shank diameter you plan to hold. ER25 covers up to 16 mm (5\/8\"), ER32 covers up to 20 mm (3\/4\"), and ER40 covers up to 26 mm (1\"). Most hobbyists running end mills up to 1\/2\" do fine with ER25; those running 3\/4\" shanks or face mills need ER32 or ER40.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What drawbar thread does this R8 shank use?\u003c\/strong\u003e\u003cbr\u003eA: 7\/16\"-20 UNF — the standard thread for R8 tooling in Bridgeport-style mills. If your drawbar is metric (M12), this chuck will not thread in without an adapter; check your mill's drawbar before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this fit my lathe tailstock?\u003c\/strong\u003e\u003cbr\u003eA: No. This is an R8-shank tool holder for mill spindles only. Lathe tailstocks use MT2 or MT3 tapers, which are physically incompatible with R8 tooling. For lathe tailstock work, see our MT2 or MT3 drill chuck arbors.\u003c\/p\u003e\n\u003ch2\u003eWhy Buy from Us\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eShips from our US warehouse in Toledo, OH — typical 3–5 business day delivery, no overseas wait\u003c\/li\u003e\n\u003cli\u003eSpanner wrench included with every collet size — no separate wrench purchase, no sourcing mismatch\u003c\/li\u003e\n\u003cli\u003e30-day returns, no restocking fee — if it doesn't fit your machine, return it\u003c\/li\u003e\n\u003cli\u003eUS-based customer support — email us a photo of your spindle, we'll confirm fit before you order\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Autobox","offers":[{"title":"ER25","offer_id":46727476347017,"sku":"TJT-ER25-R8","price":42.95,"currency_code":"USD","in_stock":true},{"title":"ER32","offer_id":46727476379785,"sku":"TJT-ER32-R8","price":52.95,"currency_code":"USD","in_stock":true},{"title":"ER40","offer_id":46727476412553,"sku":"TJT-ER40-R8","price":68.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0762\/4923\/5593\/files\/e433e0cc64a84451663c7f7be8750eb6.webp?v=1778736588"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0762\/4923\/5593\/collections\/ER_Collet_Chuck_Sets.webp?v=1777947991","url":"https:\/\/autoboxtoolworks.com\/collections\/er-collet-chuck-sets.oembed","provider":"AutoBoxToolWorks","version":"1.0","type":"link"}