Why This ER16 Collet Locks Your Tool With 0.005 mm Runout This is a single ER16 spring collet machined from solid 65Mn steel. You get a guaranteed runout of 0.005 mm at the nose, which means your dr
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Why This ER16 Collet Locks Your Tool With 0.005 mm Runout This is a single ER16 spring collet machined from solid 65Mn steel. You get a guaranteed runout of 0.005 mm at the nose, which means your dr
This is a single ER16 spring collet machined from solid 65Mn steel. You get a guaranteed runout of 0.005 mm at the nose, which means your drill or end mill spins true without chatter marks. Hardness is held at HRC 58-60 across the full taper, so the collet does not deform under repeated clamping cycles. We ship from our Dongguan factory in 7 days, and we offer a firm quote within 12 hours of receiving your drawing.
The ER16 collet uses a 8-degree included angle on the outer cone. When your ER chuck nut pulls the collet into the socket, the slots compress evenly around the tool shank. Our slots are cut with a 0.3 mm wire EDM kerf, leaving no burrs on the gripping surface. This design distributes clamping force over 80% of the shank circumference — that is why you get zero tool pull-out even at 12,000 rpm spindle speeds.
We start with 65Mn spring steel, not cheap 45# carbon steel. The blanks are turned on a CNC lathe, then milled for the six slots. Heat treatment is done in a vacuum furnace to avoid surface decarburization. Final hardness is 58-60 HRC, with a case depth of 1.2 mm. This gives you elastic recovery — the collet returns to its original diameter after releasing the tool, so you can use it 10,000+ times without losing grip.
We machine the inner bore to H5 tolerance (0/+0.008 mm). The outer cone is ground to 0.002 mm roundness. Surface finish on the bore is Ra 0.4, and on the taper it is Ra 0.2 — this reduces friction and prevents the collet from sticking in the chuck. Slot width is 1.5 mm ± 0.05 mm, and the slot depth is 80% of the collet length. These numbers are not optional; we measure every single unit, not just batch samples.
Every ER16 collet goes through three checks. First, a CMM measures the taper angle and bore diameter. Second, a hardness tester confirms HRC 58-60 on three points of the body. Third, we mount the collet on a test mandrel and measure TIR (total indicated runout) with a 0.001 mm dial indicator. If any unit exceeds 0.005 mm runout, it is scrapped — not reworked. You get a signed inspection report with every shipment.
We stock ER16 collets for shank diameters from 1.0 mm to 10.0 mm in 0.5 mm increments. The clamping range per collet is ±0.5 mm, which is standard for ER series. For example, a 6.0 mm collet holds shanks from 5.5 mm to 6.5 mm. If you need a non-standard bore, we can machine it to your exact size in 3 days. This is a single collet product — you order one piece, not a set. No MOQ applies.
Each collet is wrapped in anti-rust paper, placed in a fitted plastic tube, and boxed with a label showing the ER16 size and lot number. We ship via DHL or FedEx from our Dongguan plant. Typical transit to the US or Europe is 5-7 days. For urgent orders, we can air-freight within 24 hours of production. We do not mix batches — your collets come from one heat treatment lot for consistency.
| Parameter | Value |
|---|---|
| Material | 65Mn spring steel |
| Hardness | 58-60 HRC |
| Runout (TIR) | 0.005 mm max |
| Bore tolerance | H5 (0/+0.008 mm) |
| Surface finish (bore) | Ra 0.4 |
| Surface finish (taper) | Ra 0.2 |
| Clamping range | ±0.5 mm per collet |
| Shank diameter range | 1.0 mm – 10.0 mm |
| Slot width | 1.5 mm ± 0.05 mm |
| Lead time | 7 days for stock sizes |
| MOQ | No MOQ — order 1 piece |
No MOQ — you can order exactly one piece, and the price stays the same per unit as for a hundred.
Yes, we machine custom bore sizes to your drawing within 3 days, with the same 0.005 mm runout guarantee.
We mount each collet on a precision test mandrel and measure TIR with a 0.001 mm dial indicator; any unit above 0.005 mm is rejected.
For 50 pieces, production takes 10 days including heat treatment and inspection; we can split the shipment if you need 10 pieces faster.
Send us your drawing or just the shank diameter and quantity. We reply with a firm price and delivery date within 12 hours. For a single ER16 collet or a thousand, the process is the same. Email sc@bquq.com or WhatsApp +86 13713157787. If you are comparing options, read our CNC cutting tool selection guide and the CNC machining tolerances guide to confirm your spec. This is precision manufacturing, made in China, with no MOQ — start your order now.
| 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 |
