Collet Identification Guide

Use the guide below for selecting replacement collets. The best way to tell what type of collet you have is to measure the length of the collet. ER, TG, and SYOZ collets all have unique measurements. For best results always use a PowerCOAT nut tightened to proper specification using an accurate torque wrench.

 

ER Collet
L
D
ER 8
13mm (.51")
8.5mm (.33")
ER 11
18mm (.708")
11.5mm (.45")
ER 16
27.5mm (1.08")
17mm (.67")
ER 20
31.5mm (1.24")
21mm (.83")
ER 25
34mm (1.34")
26mm (1.02")
ER 32
40mm (1.57")
33mm (1.3")
ER 40
46mm (1.81")
41mm (1.61")
ER 50
60 mm (2.36")
52mm (2.05")

ER Collet dimensions
ER Collet Style
TG Collet
L
A
TG 75
47mm (1.85")
27mm (1.06")
TG 100
60mm (2.36")
35mm (1.38")
TG 150
76mm (3")
51mm (2")

TG collet dimensions
TG Collet Style
SYOZ / EOC Collet
L
D
EOC 8
26mm (1.026")
14.4mm (.567")
SYOZ 20
34mm (1.34")
20mm (.78")
RDO 20
34mm (1.34")
20mm (.78")
407E
34mm (1.34")
20mm (.78")
EOC 12
34mm (1.34")
20mm (.78")
SYOZ 25
52mm (2.06")
35mm (1.38")
RDO 35
52mm (2.06")
35mm (1.38")
462E / SYOZ 25
52mm (2.06")
35mm (1.38")
EOC 32
60mm (2.36")
43.7mm (1.72")


SYOZ - EOC - Perske collet dimensions
SYOZ Collet Style
DA Collet
L
D
DA 180
1.625"
1.035"
DA 100
1.438"
.769"
DA 200
1.188"
.531"
DA 300
1.000"
.375"

DA double angle collet dimensions
DA Collet Style
DNA Collet L D
DNA 11 16.9mm (0.67") 11.5mm (0.45")
DNA 16 24mm (0.94") 17mm (0.67")
DNA 20 30.42mm (1.20") 21.10mm (0.83")
DNA 32 40mm (1.57") 33.25mm (1.31")
DA double angle collet dimensions
DNA Collet Style