SKH51 Thin–wall Concentricity ◎ 0.01 Wall thickness 0.3mm–
PRECISION SMALL DIAMETER/THIN–WALL STEPPED EJECTOR SLEEVES –LONG S DIMENSION/RETENTION DIAMETER D SELECTION/RETENTION DIAMETER D DESIGNATION TYPE–
Part Number
–D–L–P–V–N–S
High Speed Steel SKH51 Die Steel SKD61 + Nitriding High Speed Steel SKH51
Order
– 121.52 – P3.25 – V2.45 – N70 – S24.0
(D selection type) ESVKF–H4.5 (D designation type) ESVKFB–H
– 4.3 – 121.52 – P3.25 – V2.45 – N70 – S24.0
Delivery Quotation
4mm 4mm
Part Number
T P Tolerance
T V Tolerance
Concentricity of inner diameter (V) against (outer diameter P)
JIS (6/8mm)
Applicable center pin shaft diameter tolerance
D selection type D designation type
PartNumber – D – L – P – V – N – S – (KC/WKC … etc.) ESVKF–H6 – 100.52 – P3.55 – V2.75 – N65 – S8.0 – KC 3.5 ESVKFB–H – 6.0 – 100.52 – P3.55 – V2.75 – N65 – S8.0 – KC 3.5
+ 0.01 0
※ Note that for sleeves with V dimension tolerance of center pins that have shaft diameter tolerance 0
10mm
Alterations
, combination with
+ 0.01 0
0 –0.005
–0.01 –0.02
ESVKF–H ESVKFB–H
–0.005 is not available. The
reason for this is fitting sections S are longer. (Details D P.219 )
φ 0.01 A
Alteration details D P.225
D(P) –0.01 –0.02
Alterations Code
Spec.
Alterations Code
Spec.
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 ) E When L40–50, guaranteed range of V dimension precision is 10mm from tip.
D(P) 0
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)
–0.005
Single flat cutting D/2 ≦ KC ＜ H/2
0 － 0.02
TC
KC
TC
KC － 0.02 0
◎ 0.003
4
＋ 3 0
0 － 3
（ L － S ）
S
Reduces the head diameter. HC = 0.1mm increments E D ≦ HC ＜ H
R ≦ 0.5
◎ 0.005
WKC Two flats cutting D/2 ≦ WKC ＜ H/2
Step R
About Designation Unit for Key Flat Cutting
0 － 0.02
HC
WKC
E In relation to the diameter tolerance, alteration may create a straight piece with little diameter difference between the head and shaft.
◎ 0.01
Varied width parallel flats cutting D/2 ≦ KAC ＜ H/2 KBC = 0.1mm increments only KAC ＜ KBC ＜ H/2
KAC KBC
◎ 0.03
－ 0.02 0
－ 0.02 0
KAC
KBC
V
Reduces the head diameter. (precision) HCC = 0.1mm increments E D + 1 ≦ HCC ＜ H–0.3
(1) To align the key flat with the retention diameter Unit of designation 0.05mm increments possible
T = 4
0
HCC
◎ 0.06
－ 0.02
A
b 2
0 －
P
＋ 5 0
0.005
（ L － N ）
N － 5 0
Two flats (right angled) cutting D/2 ≦ RKC ＜ H/2
RKC
RKC － 0.02 0
＋ 0.02 0
C = V + (0.2–0.4)
Standard
L
M Material H Hardness
SKH51
Total Length Designation
58–60HRC Range of guaranteed base material hardness (Details D P.223 ) Overall quenching (No annealing on head)
DKC Three flats cutting D/2 ≦ DKC ＜ H/2
0 － 0.02
Free Designation Shaft Diameter(P) Total Length Designation Shaft Diameter(P)
DKC
DKC
E Note that the Stepped Center Pin's shaft diameter (D) is too large to fit in the recess (C). (Details D P.220 )
Four flats cutting D/2 ≦ SKC ＜ H/2
SKC
■ Shaft Diameter D Selection Type
(2) To designate arbitrary key flat dimensions Unit of designation 0.1mm
－ 0.02 SKC 0
Stepped Shape
Part Number
0.01mm increments
N 1mm increments
S 0.5mm increments
H
AG °
± 0.5
Two flats (angled) cutting D/2 ≦ KGC ＜ H/2 AG = 1°increments 0 ＜ AG ＜ 360
Type
D
L
P
E V
Taper Clearance
0 °
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
0.80–1.60 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 1.60–5.10
KGC
40.00– 85.00
3
6
KGC
Effective Margin(S) Long Effective
85.01–125.00
120 ° 120 °
Three flats cutting at 120° D/2 ≦ KTC ＜ H/2
－ 0.02 120 ° 0
40.00– 85.00
KTC
3.5
1.0 ≦ S ≦ (V × 10)
N ≧ L/2 and (L–N) ≧ 10
Short Type
KTC
85.01–125.00
7
ESVKF–H (S Dimension Long Type)
and S ≦ 30
40.00– 85.00
4
Please use for molded products such as precision gears, which have narrow protruding part. Example
85.01–125.00
4.5
8
5
40.00–125.00
5.5
9
Precision gears
6
40.00–150.00
E Working limits for V: V ≦ P–0.6(L ≦ 85), V ≦ P–0.8(L ＞ 85) ■ Shaft Diameter D Designation Type H Part Number D 0.1mm increments
0.3mm
0.01mm increments
N 1mm increments
S 0.5mm increments
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
About precision Thin-walled stepped ejector sleeve
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
1.0 ≦ S ≦ (V × 10)
N ≧ L/2 and (L–N) ≧ 10
85.01 – 125.00 2.40 – 3.40
■ Characteristics About precision/thin–wall stepped ejector sleeves ESVKF–H/ESVKFB–H ① The fitting section (S) can be long up to V × 10. ② Precision wire cutting is used to make the S dimension longer. ③ A softened layer in the bore made by wire cutting is removed by polishing. (Tolerance of the dimension V is the value after polishing.) ④ Single wall thickness of high precision ejector sleeves (concentricity: 0.01, tolerances of V dimension + 0.01 0 ) can be designated from 0.3mm. (Pay attention to applicable size.) ■ 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– ).
1.90–2.39 2.40–3.90
ESVKFB–H (S Dimension Long Type)
40.00– 85.00
and S ≦ 30
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 1.60–5.10 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 Working limits for N: D2.6–3.0 c Nmin. = 45 (60.01 ≦ L ≦ 70.00) E In the case where the dimensions do not apply, please also refer to ESVKBF–H( P.243 ). E ＊ When D = 3.0, H = 6.
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