What This C Style Collet Chuck Holder Does for Your Spindle This is a C style collet chuck holder — a precision CNC tooling component that grips ER collets to hold cutting tools firmly in your machini
This is a C style collet chuck holder — a precision CNC tooling component that grips ER collets to hold cutting tools firmly in your machining center or lathe. You get a guaranteed runout of 0.005 mm TIR at the nose, a hardness of HRC 58-62 on the gripping surfaces, and a lead time of 10 days for standard sizes. That means less tool deflection, longer tool life, and repeatable part accuracy on every cycle.
C style collet chucks are designed with a tapered nose and a threaded retaining nut, which pulls the collet inward as you tighten. This creates a stronger, more concentric grip than a straight shank holder, especially above 10,000 RPM. For your high-speed milling or drilling operations, this design reduces vibration and prevents tool pullout — so you can push feed rates up to 20% higher without losing finish quality.
We machine the chuck body from 42CrMo alloy steel, then through-harden it to HRC 58-62. The hardened layer reaches 1.5 mm deep, so the taper won't deform even after repeated collet changes. The retaining nut is made from 20CrMnTi, carburized to HRC 58-62 for wear resistance on the threads. We grind the inner taper to a surface finish of Ra 0.4 µm, which ensures the collet seats evenly and holds runout at 0.005 mm TIR.
Every single C style collet chuck holder goes through a 100% inspection, not a sampling plan. We measure the taper angle with a CMM, check the runout with a precision mandrel, and test the thread fit with a go/no-go gauge. You also get a printed inspection report with the actual measured values, signed by our QC engineer. If any unit exceeds 0.005 mm TIR, it goes back to the grinding machine — it never ships.
We make C style chucks for ER11, ER16, ER20, ER25, ER32, and ER40 collets. The shank diameter can be 1/8" to 1-1/4" (3.175 mm to 31.75 mm), and the overall length ranges from 50 mm to 150 mm. If you use a CAT, BT, or HSK spindle, we can machine the back end to your exact pull stud or retention knob specification. Just tell us your collet series and shank size — we'll match the taper geometry precisely to the collet manufacturer's standard.
Standard finish is a black oxide coating, which protects against rust and reduces friction when inserting the collet. For coolant-heavy environments, we offer an electroless nickel plating that adds 25 µm of corrosion resistance without changing the dimensions. If you need high-temperature stability above 200°C, we can apply a TiN coating on the taper. All coatings are applied after final grinding, so the dimensional accuracy stays within tolerance.
You might think a made in China tool holder costs less but sacrifices quality. That's not true with our precision manufacturing process. Our C style collet chuck holders are ground on the same Japanese and Swiss machines used by premium brands, but our overhead in Dongguan is lower. You typically pay 30-40% less than a comparable German or American product, and we ship DDP to your door with no hidden customs fees. The tolerance and hardness are identical — we publish them, and we stand behind them.
| Parameter | Value |
|---|---|
| Material (body) | 42CrMo alloy steel |
| Material (nut) | 20CrMnTi, carburized |
| Hardness (body) | HRC 58-62 |
| Hardness (nut threads) | HRC 58-62 |
| Runout (TIR at nose) | 0.005 mm |
| Taper surface finish | Ra 0.4 µm |
| Collet series | ER11, ER16, ER20, ER25, ER32, ER40 |
| Shank diameter | 3.175 mm – 31.75 mm (1/8" – 1-1/4") |
| Overall length | 50 mm – 150 mm |
| Lead time (standard sizes) | 10 days |
| MOQ | No MOQ — order 1 piece |
| Inspection | 100% CMM + runout test, report included |
There is no MOQ — you can order a single prototype piece for testing, and we will apply the same full inspection process as a bulk order.
Yes, we can turn, grind, and thread the back end to match any standard spindle taper (CAT, BT, HSK) or your custom pull stud design — just include the drawing with your inquiry.
We grind the inner taper and nose in a single setup on a cylindrical grinder, then verify each unit with a precision test mandrel and record the actual TIR on the inspection report.
Standard sizes ship in 10 days; custom lengths or special coatings (TiN, nickel) add 3-5 days, so expect 13-15 days total — we will confirm the exact date in your quote.
Stop waiting for vague estimates. Send us your drawing or just your spindle and collet specs, and we will return a firm quote with unit price, tooling cost, and delivery date within 12 hours. For a full reference on choosing toolholders, check our CNC cutting tool selection guide. To confirm your tolerance requirements, read our CNC machining tolerances guide. Email your drawing to sc@bquq.com or reach us on WhatsApp at +86 13713157787 — we are ready to machine your first piece this week.
| 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 |
