SKD61 + Nitriding Concentricity ◎ 0.03 Head thickness JIS
STRAIGHT EJECTOR SLEEVES –SHAFT DIAMETER SELECTION TYPE/SHAFT DIAMETER DESIGNATION TYPE–
High Speed Steel SKH51 Die Steel SKD61 + Nitriding
Delivery Quotation
Part Number – L – P – V – C – S – (KC/WKC … etc.) ESNVJ8 – 200.05 – V4.0 – C5.0 – S32 – KC 4.5 ESJVB8 –200.05–P7.55– V5.0 – C5.5 – S40 – HC11.5
Alterations
4mm
Alteration details D P.225
JIS (6/8mm)
Part Number
Alterations Code
Spec.
Alterations Code
Spec.
T D/P Tolerance
T V Tolerance
Applicable center pin shaft diameter tolerance
Shaft diameter selection type
Shaft diameter designation (0.01mm increments) type
T V H7 Tolerance
10mm
Reduces the head thickness to less than standard. TC = 0.1mm increments E T/2 ≦ TC ＜ T, T–TC ≦ Lmax.–L (Dimensions L, N, (L–S) remain unchanged)
※ Note that for sleeves with V dimension tolerance of H7, combination with center pins that have shaft diameter tolerance 0 –0.005 is not recommended. The reason for this is the fitting sections S are longer. (Details D P.219 )
V ≦ 3.0 3.1 ≦ V ≦ 6.0 V ≧ 6.1 + 0.010 0 + 0.012 0 + 0.015 0
Single flat cutting (D or P)/2 ≦ KC ＜ H/2
0 － 0.05
TC
KC
TC
KC － 0.1 0
D(P) –0.01 –0.02
–0.01 –0.02
–0.01 –0.02
About Designation Unit and Tolerance for Key Flat Cutting
ESNVJ
ESJVB
H7
T
Reduces the head diameter. HC = 0.1mm increments E (D or P) ≦ HC < H
D(P) 0
–0.005
WKC Two flats cutting
b 1 (Range of Guaranteed Shaft-diameter Precision)
x 1
(D or P)/2 ≦ WKC ＜ H/2
0 － 0.1
HC
WKC
E In relation to the head diameter tolerance, alteration may create a straight piece with little diameter difference between the head and shaft.
◎ 0.003
(1) To align the key flat with the shaft diameter Unit of designation Shaft diameter (D) selection 0.05mm increments possible Shaft diameter (P) designation 0.005mm increments possible
Varied width parallel flats cutting (D or P)/2 ≦ KAC ＜ H/2 KBC = 0.1mm increments only KAC ＜ KBC ＜ H/2
KAC KBC
◎ 0.005
－ 0.1 0
－ 0.1 0
KAC
KBC
◎ 0.01
R ≦ 0.5
V
D P H7 or
－ 0.02 － 0.01
0 － 0.05
T
Two flats (right angled) cutting (D or P)/2 ≦ RKC ＜ H/2
RKC
◎ 0.03
φ 0.03
RKC － 0.1 0
S 0 ＋ 5
0
（ L － S ）
－ 5
＋ 0.05 0
＋ 0.02
）
（ L > 200
◎ 0.06
C = designated dimension
L 0
L
DKC Three flats cutting
SKD61 + Nitrided
M Material H Hardness
(D or P)/2 ≦ DKC ＜ H/2
0 － 0.1
Standard
DKC
DKC
Surface: 900HV– Base material: 40 ± 3HRC E b 1 (Range of guaranteed shaft diameter precision) (Details D P.221 ) x 1 max. = 35 Range of guaranteed base material hardness (details D P.223 ) Range of guaranteed surface hardness for nitriding (Details D P.224 )
0 –0.1
E The tolerance is
E Nitriding may extend to the head as it is applied after dimension V and P machining. E To insert a stepped center pin with the retention diameter (D) into recess diameter (C) the following condition must be met: the recess diameter (C) ≧ the retention diameter (D) + 1.0 (Details D P.220 )
Total Length Designation
even when (D or P)/2 is designated to fit to the shaft diameter.
Four flats cutting (D or P)/2 ≦ SKC ＜ H/2
SKC
－ 0.1 SKC 0
Free Designation Shaft Diameter(P) Total Length Designation
AG °
± 0.5
Two flats (angled) cutting (D or P)/2 ≦ KGC ＜ H/2 AG = 1° increments 0 ＜ AG ＜ 360 Three flats cutting at 120° (D or P)/2 ≦ KTC ＜ H/2
■ Shaft Diameter (D) Selection Type
0 °
KGC
(2) To designate arbitrary key flat dimensions Unit of designation 0.1mm
KGC
Part Number
L 0.01mm increments
V 0.1mm increments
C 0.1mm increments
S 1mm increments
Stepped Shape
H T
Cmax.
120 ° 120 °
Type
D
－ 0.1 120 ° 0
Taper Clearance
KTC
4
40.00–200.00
1.5–2.5
3.0
8
20–50 E When D4, D4.5 (V1.5 -V1.9) 20–40 L
KTC
4.5 40.00–250.00
Effective Margin(S) Long
5
2.0–3.0 2.0–3.5 2.5–4.0
3.5 4.0 4.5 5.0 5.0 5.5 6.0
9
5.5
6
6
10
Short Type
(L–S) min.
6.5
40.00–60.00
20 30
2.5–4.5
11
C ≧ V + 0.5
60.01–
7
ESNVJ
7.5
2.5–5.0 2.5–5.5
12 13
40.00–300.00
20–50
8
L
(L–S) min.
40.00–60.00 60.01–70.00 70.01–80.00
20 30 40 50
9
2.5–6.5
14
7.0
8
80.01–
10
4.0–7.5
15
8.0
■ Shaft diameter (P) 0.01mm designation type
P 0.01mm increments
C 0.1mm increments
L 0.01mm increments
E V 0.1mm increments
Part Number
S 1mm increments
H T
Cmax.
Type No.
4 40.00–200.00 3.50–3.99 4.5 40.00–250.00 4.01–4.49
1.5–1.9 1.5–2.4 2.0–2.9 2.0–3.4 2.0–3.9 2.0–4.4 2.0–4.9 2.0–5.4
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
20–50 E When No.4, No.4.5 (V1.5 -V1.9) 20–40 L
8
5
4.51–4.99 5.01–5.49 5.51–5.99 6.01–6.49 6.51–6.99 7.01–7.49
9
5.5
6
C ≧ V + 0.5 and C ≦ P–1.5
6
10
(L–S) min.
40.00–60.00
20 30
6.5
60.01–
11
ESJVB
7
40.00–300.00
20–50
7.5
12
L
(L–S) min.
40.00–60.00 60.01–70.00 70.01–80.00
20 30 40 50
8
7.51–7.99
2.5–5.9
13
6.5
8
10
8.01–9.99
2.5–7.9
15
8.5
80.01–
E V ≦ P–2.0
Part Number
–L–P–V–C–S
Order
251
252
(D selection type) ESNVJ8 – 200.05 – V4.5 – C5.0 – S32 (P selection type) ESJVB8 – 200.05 – P7.55 – V5.0 – C5.5 – S40
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