SKH51 Thin–wall Concentricity ◎ 0.005 Wall thickness 0.3mm–
PRECISION SMALL DIAMETER/THIN–WALL STEPPED EJECTOR SLEEVES
Part Number
–D–L–P–V–N–S
High Speed Steel SKH51 Die Steel SKD61 + Nitriding High Speed Steel SKH51
Order
(D selection type) – 121.52 – P3.25 – V2.45 – N70 – S7.0 (D designation type) ESVFB – 4.3 – 121.52 – P3.25 – V2.45 – N70 – S7.0 ESVF 4.5
Delivery Quotation
4mm
Part Number
JIS (6/8mm)
T P Tolerance
T V Tolerance
Concentricity of inner diameter (V) against (outer diameter P)
Applicable center pin shaft diameter tolerance
D designation type
D selection type
10mm
0 –0.005 (Details D P.219 )
+ 0.005 0
0 –0.005
ESVF
ESVFB
PartNumber – D – L – P – V – N – S – (KC/WKC … etc.) ESVF6 – 100.52 – P3.55 – V2.75 – N65 – S8.0 – KC 3.5 ESVFB – 6.0 – 100.52 – P3.55 – V2.75 – N65 – S8.0 – KC 3.5
φ 0.005 A
Alterations
D(P) –0.01 –0.02
Alteration details D P.225
E Range of guaranteed retention diameter (D) precision (Details D P.221 ) Step R (Details D P.222 ) E Range of guaranteed tip–diameter precision (b 2 ) (Details D P.222 )
D(P) 0
Alterations Code
Spec.
Alterations Code
Spec.
–0.005
Reduces the head thickness to less than standard. TC = 0.1mm increments E 2.0 ≦ TC ＜ 4, 4–TC ≦ Lmax.–L (Dimensions L, N, (L–S) remain unchanged)
◎ 0.003
Single flat cutting D/2 ≦ KC ＜ H/2
＋ 3 0
KC
0 － 3
（ L － S ）
0 － 0.02
TC
KC － 0.02 0
S
TC
Step R Step R
R ≦ 0.5
◎ 0.005
4
Reduces the head diameter. HC = 0.1mm increments E D ≦ HC ＜ H
WKC Two flats cutting D/2 ≦ WKC ＜ H/2
◎ 0.01
0 － 0.02
About Designation Unit for Key Flat Cutting
WKC
HC
E In relation to the diameter tolerance, alteration may create a straight piece with little diameter difference between the head and shaft.
◎ 0.03
Varied width parallel flats cutting D/2 ≦ KAC ＜ H/2 KBC = 0.1mm increments only KAC ＜ KBC ＜ H/2
V
KAC KBC
－ 0.02 T = 4 0
◎ 0.06
－ 0.02 0
－ 0.02 0
A
b 2
KAC
KBC
0 －
P
＋ 5 0
Reduces the head diameter. (precision) HCC = 0.1mm increments E D + 1 ≦ HCC ＜ H–0.3
0.005
（ L － N ）
N － 5 0
HCC
＋ 0.02 0
(1) To align the key flat with the retention diameter Unit of designation 0.05mm increments possible
Standard
C = V + (0.2–0.4)
L
Two flats (right angled) cutting D/2 ≦ RKC ＜ H/2
RKC
RKC － 0.02 0
Total Length Designation
M Material H Hardness
SKH51
58–60HRC Range of guaranteed base material hardness (Details D P.223 ) Overall quenching (No annealing on head)
Free Designation Shaft Diameter(P) Total Length Designation Shaft Diameter(P)
DKC Three flats cutting D/2 ≦ DKC ＜ H/2
0 － 0.02
E Note that the Stepped Center Pin's shaft diameter (D) is too large to fit in the recess (C). (Details D P.220 )
DKC
DKC
■ D selection type H
Four flats cutting D/2 ≦ SKC ＜ H/2
(2) To designate arbitrary key flat dimensions Unit of designation 0.1mm
Stepped Shape
Part Number
0.01mm increments
N 1mm increments
S 0.5mm increments
SKC
－ 0.02 SKC 0
Type
D
L
P
E V
Taper Clearance
1.80 – 2.19 2.20 – 2.45 1.80 – 2.39 2.40 – 2.95 2.40 – 2.95 1.80 – 2.39 2.40 – 3.45 2.40 – 3.45 1.90 – 2.39 2.40 – 3.95 2.40 – 3.95 2.65 – 4.45 2.65 – 4.95 2.65 – 5.45 2.90 – 5.95
0.80 – 1.40 1.00 – 1.60 0.80 – 1.60 1.10 – 2.10 1.10 – 2.10 0.80 – 1.60 1.10 – 2.60 1.10 – 2.60 0.80 – 1.60 1.10 – 3.10 1.10 – 3.10 1.10 – 3.60 1.20 – 4.10 1.20 – 4.60
2.5
40.00– 70.00
5
AG °
± 0.5
Two flats (angled) cutting D/2 ≦ KGC ＜ H/2 AG = 1°increments 0 ＜ AG ＜ 360
0 °
KGC
Effective Margin(S) Long
40.00– 85.00
KGC
3
6
85.01–125.00
Short Type
120 ° 120 °
Three flats cutting at 120° D/2 ≦ KTC ＜ H/2
－ 0.02 120 ° 0
N ≧ L/2 and (L–N) ≧ 10
40.00– 85.00
KTC
3.5
KTC
1.0 ≦ S ≦ (V × 3)
ESVF
85.01–125.00
7
40.00– 85.00
4
85.01–125.00
Example
Please use for molded products such as precision gears, which have narrow protruding part.
4.5
8
5
40.00–125.00
5.5
9
6 1.60 – 5.10 E Working limits for V D3–6 c V ≦ P–0.6(L ≦ 85),V ≦ P–0.8(L ＞ 85) D2.5 c V ≦ P–0.6 E Working limits for N D2.5 c Nmin. = 45(60.01 ≦ L ≦ 70.00) ■ D designation type 40.00–150.00
Precision gears
0.3mm
0.01mm increments
D 0.1mm increments
N 1mm increments
S 0.5mm increments
H
Part Number
L
P
E V
1.80 – 2.39 2.40 – 2.80 1.80 – 2.39 2.40 – 3.40
0.80 – 1.60 1.10 – 2.20 0.80 – 1.60 1.10 – 2.60 1.10 – 2.60 0.80 – 1.60 1.10 – 3.10 1.10 – 3.10 1.10 – 3.60 1.20 – 4.10 1.20 – 4.60 1.60 – 5.10
2.6–2.9
40.00– 70.00
6
About precision Thin-walled stepped ejector sleeve
6 (When D = 3.0) 7 (When D = 3.1–3.5)
40.00– 85.00
＊ 3.0–3.5
N ≧ L/2 and (L–N) ≧ 10
About precision Thin-walled stepped ejector sleeve ■ Precautions for use Use a structure that protects the sliding movement of ejector pins, such as precision ejector guide pins ( D P.873– ) and bushings ( D P.880– ).
85.01–125.00 2.40 – 3.40
1.90 – 2.39 2.40 – 3.90
1.0 ≦ S ≦ (V × 3)
ESVFB
40.00– 85.00
3.6–4.0
7
85.01–125.00 2.40 – 3.90
4.1–4.5 4.6–5.0 5.1–5.5 5.6–6.0
2.65 – 4.40 2.65 – 4.90 2.65 – 5.40
8
40.00–125.00
9
40.00–150.00 2.90 – 5.90
E Working limits for V D3.1 6 c V ≦ P–0.6 (L ≦ 85), V ≦ P–0.8 (L ＞ 85) D2.6–3.0 c V ≦ P–0.6 E In the case where the wall thickness is 0.6 or more (V ≦ P–1.2), please refer to ESVBF ( P.239 ). E ＊ When D = 3.0, H = 6.
E Working limits for N D2.6–3.0 c Nmin. = 45(60.01 ≦ L ≦ 70.00)
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