What This ER11 Collet Chuck Does for Your Drilling Cycle This is a CNC machined ER11 spring collet chuck with drill bit, ready for direct mounting on your spindle or holder. It holds round-shank drill
This is a CNC machined ER11 spring collet chuck with drill bit, ready for direct mounting on your spindle or holder. It holds round-shank drill bits from 1.0 mm to 7.0 mm with a guaranteed runout of 0.005 mm TIR at the nose, measured after assembly. The body is hardened to 58-60 HRC, and we ship standard sizes in 48 hours from our Dongguan factory. You get a rigid, repeatable grip that eliminates drill wandering and extends tool life by up to 30% compared to set-screw holders.
The ER11 collet uses a tapered outer surface that compresses evenly around the drill shank when you tighten the lock nut. Our chuck body is machined from a single billet of 42CrMo alloy steel, not welded or assembled from parts. The taper angle is ground to 8 degrees with a tolerance of ±0.002 mm. This precision manufacturing ensures the collet seats fully and concentrically, so your drill bit spins true at 20,000 RPM or higher. We test every chuck with a dial indicator before shipping.
We start with 42CrMo steel, which gives high toughness and wear resistance. After CNC turning and milling, we carburize the surface to a case depth of 0.8-1.2 mm, then harden to 58-60 HRC. The bore is honed to a surface finish of Ra 0.4 µm. The lock nut is made from 20CrMnTi, case-hardened to 60-62 HRC, and its threads are rolled, not cut, for smoother tightening and longer life. No coatings, no plating—just clean, hard steel that holds up in coolant-heavy drilling applications.
| Parameter | Value |
|---|---|
| Collet type | ER11 spring collet |
| Clamping range | 1.0 mm – 7.0 mm (metric), 1/16" – 1/4" (inch) |
| Chuck body material | 42CrMo alloy steel, carburized |
| Hardness (body) | 58-60 HRC |
| Hardness (lock nut) | 60-62 HRC |
| Runout (TIR at nose) | 0.005 mm |
| Surface finish (bore) | Ra 0.4 µm |
| Taper angle accuracy | ±0.002 mm |
| Max RPM | 20,000 RPM |
| Lead time (standard sizes) | 48 hours |
| MOQ | No MOQ – order 1 piece |
Many low-cost chucks are made from free-cutting steel or even cold-drawn bars, which deform under heat. We machine the ER11 chuck body from a solid 42CrMo billet on a 5-axis CNC lathe, then grind the taper on a dedicated internal grinder. This process removes residual stress and gives you a chuck that holds its geometry after thousands of clamping cycles. If you compare our chuck to a cast or forged competitor, you will see the difference in the first 100 parts you drill.
Each chuck is 100% inspected, not sample-checked. We use a CMM (coordinate measuring machine) to verify the taper angle, bore diameter, and concentricity. Then we assemble the chuck with a standard ER11 collet and a 5.0 mm drill bit, spin it on a test spindle, and measure runout with a laser sensor. We record the actual runout value on the QC report, which you receive with the shipping documents. If the runout exceeds 0.005 mm, the chuck is scrapped—not reworked.
The standard shank is straight, 10 mm diameter by 30 mm long, but we can machine any shank configuration you need: threaded, tapered, or with a flat for set screws. Send us your spindle drawing or the holder part number, and we will match the geometry exactly. We also offer the chuck with a pre-mounted ER11 collet of your chosen size, so you do not have to buy collets separately. For drilling deep holes, we can add internal coolant holes through the Chuck body.
No MOQ – you can order a single piece to test with your machine, and we offer quantity discounts starting at 10 pieces.
Yes, we machine custom shanks, extended lengths, and special clamping ranges up to 7.0 mm, with your drawing or a sample part.
We use SPC (statistical process control) on every batch, and each chuck comes with a CMM inspection report and a runout certificate.
Standard sizes ship in 48 hours; custom shanks or materials take 5-7 working days, and we can rush orders for an additional fee.
Before you buy, check our CNC cutting tool selection guide to see how this chuck fits into your overall tooling strategy. For tighter tolerances on the chuck itself, review our CNC machining tolerances guide to understand what we can hold on your custom part.
This CNC machined ER11 spring collet chuck with drill bit is made in China, and it is built for production environments where downtime costs money. Every chuck is inspected, tested, and shipped with a report. We are a precision manufacturing factory with 20 years of experience, and we stand behind our work.
Send your drawing or the spindle interface details to get a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. No MOQ, no minimum call-out—just a precision chuck that works.
| Parameter | Capability |
|---|---|
| Materials | AL6061/7075, SUS303/304/316, 45# steel, T2 copper, H59 brass, POM, PEEK, nylon |
| Tolerance | ±0.005mm standard, ±0.003mm on request |
| Machines | 3/4/5-axis CNC, turn-mill, Swiss lathe |
| Surface | Anodizing, nickel, zinc, passivation, sandblast, polish |
| Size Range | Max 400 x 300 x 200 mm |
| Prototype | 72 hours, no MOQ on samples |
| Inspection | Full report per batch, CMM data on request |
