PRODUCT DATA ①
■ Step R and Concentricity of Stepped Ejector Sleeves
■ Guaranteed Range of Shaft-Diameter Precision for Ejector Sleeves and Center Pins
Step R
Straight Ejector Sleeves
Center Pins –Shaft Diameter (D) Selection Type–
x 1
b 1
x 1
b 1
Shaft diam- eter (D or P) Guaranteed precision range Length (b 1 )
a ± 3
P D
0 － 5
（ L － N ）
N
F
L
E For shaft diameter (P) designation type refer to the explanation given below.
L
b 1 ≧ F – x 1 max. or b 1 ≧ L – (Tip length) – x 1 max.
In order to ensure the effective dimensions of the length (L–N) of the tip diameter (P), (L–N) is designed to be a plus tolerance and N is a minus tolerance. Step R is configured to form a smooth transition between tip diameter (P) and retention diameter (D). Size of step R: Approximately R8–12 ＊ ＊ The size of step R is determined by the size of the grindstone used to process it. This is not a guaranteed value for R. Formula used for calculating the length (a) of step R: a = D–P 2 × (2R– D–P 2 ) Concentricity of tip diameter (P) and shaft diameter (D): 0.2 mm or less
b 1 ≧ L – x 1 max.
Stepped Ejector Sleeves
Stepped Center Pins
x 1
e
a
e a
x 1
Retention Diameter (D) Guaranteed precision range Length (e)
■ Step R and Concentricity of Stepped Center Pins
Step R
N
N
＊ 5: Tolerance of length of N
e ≧ N–5–x 1 max.–a–3
e ≧ N–5–x 1 max.–a–3
＊ 5: Tolerance of length of N
＊ a: Length of step R section
＊ 3: Tolerance of step R section length
＊ a: Length of step R section
＊ 3: Tolerance of step R section length
a ± 3
D P
• Straight Ejector Sleeves • Center Pins T Shaft diameter (D or P) tolerance
• Stepped Ejector Sleeve • Stepped Center Pins T Retention diam- eter (D) tolerance
x 1 max.
M Material
Head thickness (T)
（ F － N ）
－ 5 N 0
30 ＊
T4 (4mm)
E This does not apply to the shaft diameter (P) designation type center pins. Refer to the explanation below for details.
F
d 1 Precision
SKH51
p 1 Precision
JIS (4/6/8mm)
35
d 1 = D d 1 = D d 1 = D d 1 = D
D 0 D 0
0 –0.1 0 –0.1
In order to ensure the effective dimensions of the length (F–N) of the tip diameter (P), (F–N) is designed to be a plus tolerance and N is a minus tolerance. Step R is configured to form a smooth transition between tip diameter (P) and retention diameter (D). Size of step R: Approximately R8–12 ＊ ＊ The size of step R is determined by the size of the grindstone used to process it. This is not a guaranteed value for R. Formula used for calculating the length (a) of step R: a = D–P 2 × (2R– D–P 2 ) Concentricity of tip diameter (P) and shaft diameter (D): 0.2 mm or less
p 1 = (D or P)
0 –0.1
(D or P) 0
–0.005
SKD61
T4 (4mm) T4 (4mm) ECB, ECBB T4 (4mm)
40
–0.005
(D or P) –0.01 –0.02 (D or P) –0.01 –0.03
–0.02
1 = (D or P)
–0.01 –0.1
p
D –0.01 –0.02 D –0.02 –0.04
–0.01 –0.1 –0.02 –0.1
10
SKD61 + Nitriding
40 40 40
JIS (4/6/8mm) T10 (10mm)
＊ When L20.00–39.99 is x 1 max. = 10
■ Center Pins –Shaft diameter (P)designation type–
•
Details of A part
■ Guaranteed Range of Tip-Diameter Precision for Stepped Ejector Sleeves
b 1
x 1
(Guaranteed Range of Shaft-diameter Precision)
x 1
b 1
※
Step R
Step R
A part
F
b 1 ≧ F － x 1
L
G
b 2
a
P D
0 － 5
（ L － N ）
N
Misumi's center pin –shaft diameter (P) designation type– enables to be designated in 0.01mm or 0.1mm increments of the shaft diameter (P) even with long length L. The length of the guaranteed range of shaft-diameter (P) precision is set to b 1 , and other shaft–diameter areas are relief processed.
• When L ≧ 200.01 As shown in the figure on left side, smooth step R processing is performed on the junction section between the shaft diameter (P) area and the relief area. ※ Size of step R: approximately 100R (reference value)
L
b 2 = Tip diameter (P) Guaranteed precision range
b 2 Guaranteed range
Tip diameter (P) tolerance
M Material
( L–N )
G max.
J Tolerance
x 1 max.
40.00 or less
3
T Shaft diameter (P) tolerance
p 1 Precision
M Material
Head thickness (T)
40.01– 60.00
10
L150.00 or less
L150.01 —200.00
L200.01 —250.00
L250.01 —300.00
L300.01 —350.00
L350.01 —400.00
L400.01 —450.00
L450.01 —500.00
P 0
0 –0.03
b 2 ≧ (L–N)–Gmax.
SKH51
60.01– 80.00
15
J
–0.005
30
30
T4 (4mm)
80.01–100.00
20
0 –0.1
0 –0.005
p 1 = P
P
JIS (4/6/8mm)
35
35
SKH51 ( ※ Shaft diameter 0.01mm increments)
100.01–125.00
25
110
160
210
–
–
–
T4 (4mm)
30
30
40.00 or less
3
–0.01 –0.1
–0.01 –0.02
p 1 = P
P
P –0.01 –0.02
JIS (4/6/8mm)
35
35
40.01– 60.00
10
0 –0.1
0 –0.005
p 1 = P
P
60.01– 80.00
15
SKD61 ( ※ Shaft diameter 0.01mm increments) SKD61 + Nitriding ( ※ Shaft diameter designation in 0.1mm increments)
J –0.01 –0.05
SKD61 + Nitriding
b 2 ≧ (L–N)–Gmax.
T4 (4mm)
40
60
110
160
210
–
–
–
–0.01 –0.1
–0.01 –0.02
p 1 = P
80.01–100.00
20
P
P –0.01 –0.03
100.01–125.00
25
T4 (4mm)
–0.01 –0.02 –0.01 –0.03
(P ≦ 12.0) (P ＞ 12.0)
P
–0.01 –0.1
p 1 = P
40
40
40
40
210
260
310
360
221
222
P
125.01–
25
JIS (4/6/8mm)
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