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EJECTOR SLEEVES

Straight Ejector Sleeves



Material Head Thick-
ness
(T)
Concen-
tricity between the hole and shaft diameters
Hole
diameter
(V)
Finishing
Hole dia-
meter
(V)
Smax. Shaft
dia-
meter
tole-
rance
Blank
type
L
dimen-
sion
designa-
tion type
LCV dimension designation type
Shaft dia-
meter selec-
tion
Shaft diameter designa-
tion
4mm
(T4)
0.005 Grinding +0.005
0
V×3
and
S≤25
0
-0.005
- - ESV ESVB
+0.01
0
V× 5
and
S≤25
ESV-H ESVB-H
6·8mm
(JIS)
+0.005
0
V×3
and
S≤25
ESVJ ESVJB
4mm
(T4)
0.01 Wire cutting
&
Polishing
+0.01
0
V×10
and
S≤50
- - ESVK-H ESVKB-H
6·8mm
(JIS)
ESVKJ-H ESVKJB-H
4mm
(T4)
0.03 Reaming H7 50 -0.01
-0.02
ESNV ESNV-LC ESNV-L ESNVB
6·8mm
(JIS)
- - ESNVJ ESJVB
4mm
(T4)
0.06 100
(150)
-0.01
-0.02
ESN ESN-LC ESN-L ESNB
6·8mm
(JIS)
-0.01
-0.02
(-0.01
-0.03)
ESJ ESJL ESNJ ESJB

Straight Ejector Sleeves -Tapered Type-



Material Head Thickness(T) Concen-
tricity between the hole and shaft diameters
Hole
diameter(V)
Finishing
Hole
diameter(V)
Smax. Tip
dia-
meter
(P)
tole-
rance
L·V dimension designa-
tion type
SKH51 equivalent 4mm
(T4)
0.003 Grinding +0.005
0
V×3 0
-0.005
ESVX

Short Ejector Sleeves (Straight Core Sleeves)


Straight Core Sleeves are published on index of Shaped Inlay Core Pins for Boss.
Product name Material Head Thick-
ness
(T)
Concen-
tricity between the hole and shaft diameters
Hole
diameter
(V)
Finishing
Hole
diameter
(V)
Smax.
(Reference)
Tip
diameter
(P)
tolerance
L·V dimension designation type
Shaft
dia-
meter selection
Shaft diameter designa-
tion

Short Ejector Sleeves

SKD61 equivalent

Nitrided
4mm
(T4)
0.06 Reamers H7 30 -0.01
-0.02
ECB
ECBB
-
SKH51
equivalent
0.01 Wire cutting
& Polishing
+0.005
0
3 0
-0.005
EPBBH
+0.01
0
-0.01
-0.02
EPBB-H
EPBB-M
Straight Core Sleeves SKH51 equivalent 4mm
(T4)
0.005 Grinding +0.005
0
V×3 designation 0
-0.005
CSV4T CSVB4T
V×3 specification CSHKV4T CSHKBV4T
+0.01
0
V×3 designation CSHL4T CSHB4T
Wire cutting
&
Polishing
V×10 specification CSHK4T CSHKB4T
6 · 8mm
(JIS)
Grinding +0.005
0
V×3 designation CSV CSVB
V×3 specification CSHKV CSHKBV
+0.01
0
V×3 designation CSHL CSHB
Wire cutting
&
Polishing
V×10 specification CSHK CSHKB
NAK80 4mm
(T4)
0.005 Grinding +0.005
0
V×3 designation 0
-0.005
CSGLV4T CSGBV4T
V×3 specification CSGKV4T CSGKBV4T
+0.01
0
V×3 designation CSGL4T CSGB4T
Wire cutting
&
Polishing
V×10 specification CSGK4T CSGKB4T
6 · 8mm
(JIS)
Grinding +0.005
0
V×3 designation CSGLV CSGBV
V×3 specification CSGKV CSGKBV
+0.01
0
V×3 designation CSGL CSGB
Wire cutting
&
Polishing
V×10 specification CSGK CSGKB

Stepped Ejector Sleeves



Material Head Thickness
(T)
Concen-
tricity between the hole and shaft diameters
Hole
diameter
(V)
Finishing
Hole
diamete
(V)
Smax. Tip
dia-
meter
(P)
tole-
rance
Blank
type
L
dimen-
sion
designa-
tion type
L·V dimension designation type
Shaft diameter selection Shaft diameter designa-
tion
4mm
(T4)
0.005 Grinding +0.005
0
V×3 0
-0.005
- - ESVF ESVFB
V×3
and
S≤25
- - ESVFE ESVBF
+0.01
0
V×5
and
S≤25
ESVFE-H ESVBF-H
6 · 8mm
(JIS)
+0.005
0
V×3
and
S≤25
- - ESVJFE ESVJBF
4mm
(T4)
0.01 Wire cutting
&
Polishing
+0.01
0
V×10
and
S≤30
  - - ESVKF-H ESVKFB-H
V×10
and
S≤50
  - - ESVKFE-H ESVKBF-H
6 · 8mm
(JIS)
V×10
and
S≤50
  ESVKJFE-H ESVKJBF-H
4mm
(T4)
0.03 Reaming
H7 50 -0.01
-0.02
(-0.01
-0.03)
- - ESNVF -
6 · 8mm
(JIS)
              ESJVF  
4mm
(T4)
0.06     100   ESNFT ESNF-LC ESNF -
6 · 8mm
(JIS)
      ESJFT ESJF-LC ESJF

Stepped Ejector Sleeves -Relief Tapered Type-



Material Head Thickness(T) Concen-
tricity between the hole and shaft diameters
Hole
diameter
(V)
Finishing
Hole
diameter
(V)
Smax. Tip
diameter
(P)
tolerance
L·V dimen-
sion designa-
tion type
SKH51 equivalent 4mm
(T4)
0.005 Grinding +0.005
0
V×3 0
-0.005
ESVFX

Ejector Sleeves & One-step Center Pin Sets



Material Head Thickness(T) Sleeve shape Center Pin shape L dimension designation typ L·V dimension designation type
SKH51 equivalent 4mm
(T4)
Straight Tip stepped straight ESV-S-□ -
SKD61 equivalent
+
Nitrided
4mm
(T4)
Straight Tip stepped straight ESNS-□ ESNP-□
6 · 8mm
(JIS)
ESJS-□ ESJP-□
4mm
(T4)
Stepped Tip stepped straight ESNM-□ ESND-□
6 · 8mm
(JIS)
ESJM-□ ESJD-□

Ejector Sleeve and Center Pin Combination Example

Center Pin Shaft Diameter(D or P)Tolerance
0
-0.005
-0.01
-0.02
Ejector sleeve
hole diameter
(V)
tolerance
+0.005
0
(precision class)

Suitable
Because the clearance between the ejector sleeve and center pin is kept to 0.01 mm and below, this is used in cases where the plastic is conducive to the development of burrs, and for precision molds.
Suitable
Because the clearance between the ejector sleeve and the center pin is large, this is used in applications where smooth sliding is required.(*The hole diameter of the ejector sleeve can also be made 0.01 mm larger.)
+0.01
0
and
H7
×
Unsuitable
Combination of the ejector sleeves and shaft-diameter tolerance center pins is unsuitable, due to the large contact surface with the center pins. Where the same dimensions have been specified for hole diameter and shaft diameter, take caution as there have been problems with the pins not fitting the holes, the pins stopping partially into the holes and sliding not being smooth.
Suitable
The minimum clearance required for fit between the ejector sleeve and center pin (0.01 mm) can be achieved. This is widely used in general applications, where the plastic is not conducive to the development of burrs.

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