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Home » Products » CNC Tool Holders (BT/SK/CAT/NT/HSK/ISO) » Precision ER Collet Chuck Tool Holder | BT, CAT, SK, NT Spindle Mounts

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BT ER Collet Chuck Tool Holder BT ER Collet Chuck Tool Holder
BT ER Collet Chuck Tool Holder BT ER Collet Chuck Tool Holder
BT ER Collet Chuck Tool Holder BT ER Collet Chuck Tool Holder
BT ER Collet Chuck Tool Holder BT ER Collet Chuck Tool Holder
BT ER Collet Chuck Tool Holder BT ER Collet Chuck Tool Holder

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Precision ER Collet Chuck Tool Holder | BT, CAT, SK, NT Spindle Mounts

Size:
BT30
BT40
BT50
Availability:
Inquire
Maximize your CNC machining precision and versatility with our Premium ER Collet Chuck Tool Holders. Manufactured by Pingyuan Zhenghao Machinery, these essential tool holders are designed to securely grip a wide range of cutting tools (end mills, drills, reamers) using the industry-standard ER collet system. Forged from high-quality 20CrMnTi alloy steel and precision-ground to achieve an ultra-low runout of ≤ 0.005mm, our ER chucks ensure extended tool life and superior surface finishes. Available in all major spindle tapers including BT30/40/50, CAT40/50, SK40/50, and NT30/40, and dynamically balanced for high-speed performance at unbeatable factory-direct prices.

  • BT30 BT40 BT50

  • XZH

  • 8466100000

  • Alloy Steel 20CrMnTi

  • 56-58HRC

  • Machine tools collet chuck tool holder clamping accessories

  • MAS403 shank

  • 0.005mm

  • BT30/BT40/BT50

  • Silver

  • MAS 403 and B6339

  • 0.003mm

  • G2.5 25000rpm G6.3 12000rpm

  • BT30 BT40 BT50 ER Collet Chuck Tool Holder

  • XZH

Product Description

BT ER Collet Chuck Tool Holder

Specification

Material: 20CrMnTi

Taper tolerance:<AT3 

Carbon depth: 0.8mm±0.2mm

Max. Run out: <0.005mm

Surface Roughness: Ra<0.005mm

Cooling AD＋B type can be made by request

When Order, please specify balancing G6.3 or G2.5

Shank body standard: MAS403 


ER Collet Chuck Tool Holder


Model

D

D1

L1

Clamping Range

Wt(KG)

BT30xER20-70

35

31.75

70

0.5-13

0.55

BT30xER25-70

42

31.75

70

0.5-16

0.58

BT30xER32-70

50

31.75

70

1-20

0.85

BT30xER40-80

63

31.75

80

2-26

1.10


BT40xER16-70

32

44.45

70

0.5-10

1.14

BT40xER20-70

35

44.45

70

0.5-13

1.16

BT40xER20-100

35

44.45

100

0.5-13

1.38

BT40xER20-130

35

44.45

130

0.5-13

1.76

BT40xER25-70

42

44.45

70

0.5-16

1.22

BT40xER25-100

42

44.45

100

0.5-16

1.52

BT40xER25-130

42

44.45

130

0.5-16

1.90

BT40xER25-160

42

44.45

160

0.5-16

2.10

BT40xER32-70

50

44.45

70

1-20

1.30

BT40xER32-100

50

44.45

100

1-201

1.72

BT40xER32-130

50

44.45

130

1-202

2.05

BT40xER32-160

50

44.45

160

1-202

2.58

BT40xER40-80

63

44.45

80

2-26

1.45

BT40xER40-100

63

44.45

100

2-26

2.01

BT40xER40-160

63

44.45

160

2-26

3.29


BT50xER16-70 28
 69.85 70 0.5-10 3.64

BT50xER20-70

35 69.85 70 0.5-13 3.67

BT50xER20-100

35 69.85 100 0.5-13 3.84

BT50xER25-70

 42 69.85 70 0.5-16 3.7

BT50xER25-100

42 69.85 100 0.5-16 4.54

BT50xER32-70

 50 69.85 70 1-20 3.73

BT50xER32-100

50 69.85 100 1-20 5.2

BT50xER32-160

50 69.85 160 1-20 4.97

BT50xER32-200

 50 69.85 200 1-20 5.48

BT50xER40-80

63 69.85 80 2-26 3.76

BT50xER40-100

63 69.85 100 2-26 4.44

BT50xER40-160

63 69.85 160 2-26 5.77

BT50xER40-200

63 69.85 200 2-26 6.66

Detailed Image

bt er tool holder08

[Product Overview]

The ER Collet Chuck Tool Holder is the most widely used and versatile tool holding system in the metalworking industry. By utilizing interchangeable ER collets (which have a wide collapse range of up to 1mm or 0.039"), a single ER chuck can securely clamp a vast array of metric and imperial tool shank diameters. Whether you are performing heavy roughing, high-speed finishing, drilling, or rigid tapping on a CNC machining center, the ER collet chuck provides the perfect balance of gripping force, concentricity, and clearance.

[Key Features & Advantages]

  • High-Precision Runout: Both the external spindle taper and the internal ER collet pocket are precision ground in a single setup. This guarantees a maximum Total Indicator Runout (T.I.R.) of ≤ 0.005mm (0.0002"), reducing tool wear and preventing chatter.

  • Premium Material & Hardness: Constructed from high-grade 20CrMnTi alloy steel. The tool holders are case-hardened to HRC 56-60, providing a tough, shock-absorbing core and a highly wear-resistant surface.

  • Dynamic Balancing (Optional/Standard): For high-speed machining applications, our tool holders can be dynamically balanced to G6.3 at 15,000 RPM or G2.5 at 25,000 RPM, protecting your machine's spindle bearings and ensuring flawless cuts.

  • Comprehensive Taper Selection: We manufacture ER chucks to fit almost any machine tool in the world, including BT (MAS 403), CAT (ANSI B5.50), SK/DAT (DIN 69871), and NT (DIN 2080) tapers.

  • Versatile ER Sizes: Available in all standard ER sizes: ER11, ER16, ER20, ER25, ER32, and ER40, offered in various gauge lengths (stub, standard, and extended) to accommodate any machining depth or fixture clearance requirement.

[Why Partner with Pingyuan Zhenghao Machinery?]

  • Direct Manufacturer Savings: Bypass trading companies and source premium CNC tooling directly from our factory for highly competitive wholesale pricing.

  • Strict Quality Control: Every tool holder undergoes rigorous inspection using advanced air gauges and balancing machines to ensure it meets strict international standards (DIN, ISO, MAS, ANSI).

  • Complete Tooling Systems: We supply the ER chucks, high-precision ER collets, clamping nuts (Hex, Spanner, Mini, or Bearing types), pull studs (retention knobs), and wrenches for a complete, ready-to-use setup.

  • OEM & Customization: We offer laser engraving of your brand logo, part numbers, and custom balancing specifications directly onto the tool holders for retail distribution.

Frequently Asked Questions (FAQ) - Selection Guide

Q1: What does "ER32" mean?

A: "ER" refers to the standard collet design (invented by Rego-Fix). The number "32" refers to the approximate outside diameter of the collet in millimeters. An ER32 chuck uses ER32 collets, which can grip tool shanks ranging from 2mm up to 20mm (or 1/16" to 3/4").

Q2: Should I choose a Hex Nut, Spanner (UM) Nut, or Mini (M) Nut?

A:

  • Hex Nut: Common on smaller sizes (ER11, ER16, ER20). Tightened with a standard wrench.

  • Spanner/UM Nut: Common on larger sizes (ER25, ER32, ER40). Features slots and requires a hook or spanner wrench. Offers higher clamping torque.

  • Mini (M) Nut: Has a smaller outside diameter than standard nuts. Ideal for machining in tight spaces or deep pockets where clearance is limited.

Q3: Do I need a balanced tool holder?

A: If your CNC machine spindle runs at speeds above 8,000 - 10,000 RPM, balancing is highly recommended. Unbalanced tool holders create centrifugal forces that cause vibration (chatter), poor surface finish, premature tool failure, and rapid wear on your expensive spindle bearings.

Q4: How do I properly install a collet into the ER chuck nut?

A:Crucial Step: You must snap the ER collet into the clamping nut before inserting the cutting tool and before screwing the nut onto the chuck. Insert the collet at an angle into the nut and press until the extractor ring clicks into the groove on the collet. If you drop the collet into the chuck first and then screw the nut on, you will damage the nut and the collet will not clamp correctly.

Upgrade your CNC machining precision with our rigid and accurate ER collet chucks.

Contact our sales team today for a complete catalog and bulk pricing.