DIN69871 SK30/40/50-ER MILLING CHUCK ARBORS

SK milling chuck (SK chuck system) core advantages

1. Ultra high precision

SK cylinder clamp cone angle of 8 ° (ER cylinder clamp 16 °), with a larger clamping and bonding area; The finished product combination has a bounce of ≤ 3-5 μ m, and the high-precision version can reach 2 μ m, far superior to ordinary ER tool holders. The processed mirror surface and precision mold have no vibration patterns.

2. Double the clamping force

8 ° shallow cone locking tool structure, clamping force twice that of ER chuck, high-speed cutting tool does not slip or fall off, suitable for high feed milling.

3. Excellent high-speed dynamic balance

One piece thin-walled slim body, no wind resistance nut, factory standard G2.5 dynamic balance, SK40 can adapt up to 25000-40000 revolutions per minute, suitable for high-speed machines and engraving and milling machines.

4. Good air avoidance

The front end has a slender outer diameter, and deep cavities, narrow grooves, and dead corners of the mold are not easy to hit the workpiece, making it suitable for precision mold machining.

5. Extend tool life

Extremely small radial runout, uniform force on each cutting edge, reducing tool wear by more than 20%.

Applicable processing scenarios

1. High speed precision milling of mold steel, aluminum parts, and copper parts

2. Deep hole drilling, reaming, and rigid tapping

3. Processing of shock prone materials such as graphite and acrylic

4. High gloss processing of small precision parts, medical devices, and 3C products

FAQ:

Q1: What does DIN69871 standard mean?

A: DIN69871 is German standard for ISO taper tool holders, also known as SK taper, with flange drive keys.

Q2: What’s the difference between SK30, SK40 and SK50?

A: SK30: small taper, for light cutting & high speed. SK40: most common for medium milling. SK50: larger taper, higher rigidity for heavy cutting. Not interchangeable.

Q3: What runout can your SK ER arbor achieve?

A: ≤0.003mm at 3xD for precise machining.

Q4: Can I mix SK and BT tool holders?

A: No. Different flange and taper dimensions, cannot fit each other’s spindle.

Q5: What ER collet series are available?

A: ER16, ER20, ER25, ER32, ER40. Custom lengths available.

Q6: Maintenance tips for SK ER arbor?

A: Keep taper and flange clean. Avoid scratches on contact surface to prevent runout and spindle damage.

Q7: Lead time & warranty?

A: Standard sizes in stock, 3–7 days delivery. Custom 7–15 days. Warranty against manufacturing defects.