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ER Spring Collets

HIGH-PRECISION SPRING COLLET SYSTEM

The universal standard for tool holding

High-precision ER Spring Collets are the most versatile tool holding system available. Each collet has a collapse range allowing it to grip a range of tool shank diameters, providing flexibility and excellent concentricity.

ER COLLET SIZE GUIDE

ER Size	Clamping Range	Best For
ER8	0.5 - 5mm	Micro tools, engraving
ER11	0.5 - 7mm	Small tools, precision work
ER16	1 - 10mm	Light milling, drilling
ER20	1 - 13mm	General purpose
ER25	2 - 16mm	General machining
ER32	2 - 20mm	Most common, versatile
ER40	3 - 26mm	Larger tools
ER50	6 - 34mm	Heavy duty

KEY BENEFITS

1mm collapse range per collet

Excellent concentricity (<0.01mm TIR)

Quick tool changes

Universal compatibility

Compatible ER Collet Accessories

Specifications

Material & Construction

Material: 65Mn, Hardness: HRC44-48

ER Collets

Name: ER Collets
Brand: ZHUZHOU SENO
SKU: er-collets
Availability: InStock

Select Specifications

D=Diameter | L1, L2, L3=Length Dimensions | L=Overall Length | D1=Shank Diameter | All in mm

Select blade width, groove depth (T), and working radius range to find the right Face Groove tool

Select boring diameter range, shank diameter (D), and insert type (C=diamond/T=triangular) to find the right boring head

Select CBA model (complete boring range) and internal boring range to find the right micro finish boring head

Select LBK model (matches your CBA boring head) and extension length to find the right extension rod

Select BT type (spindle taper), LBK number (locking block socket), CBA head model, and projection length (L1) to find the right boring head shank

Variant Type

Orientation

φ Dmin (Minimum Bore Diameter)

φ d (Diameter)

Square Dimension (h)

How to Choose the Right Holder

Shank Height (H): Choose based on your machine's tool holder/turret slot size
Tool Height (H3): Must match the H dimension of your SPB Tool (26mm or 32mm)

Example: If you have SPB26-3 tool (H=26mm), select H3=26mm

Width (W)

Shank Height (H)

Tool Height (H3)

Must match your SPB Tool's H dimension

Product Type

Size

Length

Drill Type

Diameter (D)

Length Variant

Flutes

HRC Grade

HRC≤56 is recommended for best price/performance ratio with newest nano-black coating technology.

Blade Width

Groove Depth (T)

Radius Range (Min/Max)

Found variant

Legend:

Blade Width Groove Depth (T) Radius Range Compatible Insert

No variants match the selected filters.

Try adjusting your filter selections.

Found variant

Legend:

Width (W) Height (H) Other Dimensions Insert/Accessories

No variants match the selected filters.

Try adjusting your filter selections.

ER Collet Model

Diameter

Diameter (D)

Length (L)

Shank Diameter (d)

Cutting Diameter

Corner Radius

Overall Length

GT Model

Thread Capacity

Standard

Lifting Capacity

Model

Model Code

QTY & Sizes

Shank Type

Collet System

Length (L1)

Type

Bore Diameter (d)

Length (L1) (Optional)

MTA Type

Tap Type

Thread Size

Pitch (mm)

Length

ERG Model

Metric Thread Size

ER Nut Type

ER Nut Model

Spanner Type

Spanner Model

Standard

Model

Model Code

Base Model

Length (L)

C Holder Size

ER Collet Size

Grade / Type

Length (L1) (Optional)

SL Holder Size

ER Collet Size

SK Type

ER Collet Size

Length (L1)

SK Taper

SLN Bore Size (inner diameter "d")

BT Type

BSA Size (for square shank tools)

BT Type

BSB Size (for square shank tools)

BT Type (spindle taper)

GT Chuck Type (tapping collet system)

Shank Diameter (D) (straight shank)

GT Chuck Type (tapping collet system)

Morse Taper Type (spindle taper)

GT Chuck Type (tapping collet system)

BT Type (spindle taper)

Clamping Range (drill bit size range)

MT Type (Morse Taper)

Capacity (drill bit size range)

SK Type (spindle taper)

Range (drill bit size range)

B Type (arbor taper)

MT Type (Morse Taper)

BT Type (spindle taper)

MT Type (tool taper)

Puller Type (DIN standard)

Model (MS.NO size)

Clamping Range (drill bit size range)

Taper Type (Morse or Jacobs)

Variation (chuck configuration)

Boring Range (min-max diameter)

Shank Diameter (D) (boring bar shank)

Insert Type (C=diamond, T=triangular)

CBA Model (complete boring range)

Internal Boring Range (diameter range)

LBK Model (extension rod size)

Extension Length (L) (reach)

BT Type (spindle taper)

LBK No. (locking block socket)

CBA Head (boring head model)

Projection Length (L1) (reach into workpiece)

Select Variant (multiple options available for this diameter)

SKU / Article Number

φ(d)

Morse #

★

Price per piece

€

30% Discounted price

D (Diameter)

L (Overall)

Insert Code

Insert Count

Insert

Blade Width

Blade Height

Groove Depth

Orientation

Working Radius Range

Compatible Inserts

φ(d)

Morse #

H7 Tolerance

Stock: pcs

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Please select specifications above to see details

ER Spring Collets

ER COLLET SIZE GUIDE

KEY BENEFITS

Compatible ER Collet Accessories

BT x ER Tool Holders

SK Type High-Speed & Fine Balanced Tool Holders

HSK-A-ER Tool Holder

ER Collets extension Bars

Side Lock ER Collets Straight Shank chucks

Specifications

Material & Construction

ER Collets

Select Specifications

How to Choose the Right Holder

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