STRAIGHT CENTER PINS
ALTERATION GUIDE FOR STRAIGHT CENTER PINS
Applicable Products
Items
Alteration
Code
Specifications
STRAIGHT CENTER PINS WITH TIP PROCESS
Precision key flat cutting
Precision single flat cutting Range of designation (DorP)/2 ≦ VKC < H/2 E High speed steel SKH51 only applicable Precision two flats cutting Range of designation (DorP)/2 ≦ VWC < H/2 E High speed steel SKH51 only applicable
Shape C
Shape G
Shape T
Shape R
Shape B
Shaft diameter
VKC
Shape
To make a flat at the shaft diameter position for straight type
Applicable ejector sleeve hole diameter (V) tolerance
－ 0.02 VKC 0
Center pin shaft diameter tolerance
Precision key flat cutting
T
L
VWC
－ 0.02 VWC 0
Head thickness (T)
Shaft diameter Tolerance
KC
M Material
Shaft Diameter (D) Selection Type
Shaft Diameter (P) Designation Type
Key flat cutting
Unit of designation • Straight Shaft diameter fixed type (D/2)……0.05 mm increments possible Shaft diameter designation 0.01 mm increments type (P/2)……0.005 mm increments possible Shaft diameter designation 0.1 mm increments type (P/2)……0.05 mm increments possible Designation method • VKC2.82 (When P5.64) • VWC3.375 (When P6.75) • KC2.61 (When P5.22) • WKC3.085 (When P6.17) • RKC2.74 (When P5.48) • DKC3 (When D6) • KGC1.5 – AG125 (When D3) • KTC3.085 (When P6.17)
Single flat cutting Range of designation (DorP)/2 ≦ KC < H/2
CPH–5L □ CPHE–5L □ CPHJ–5L □ CPHJE–5L □
CPHG–5L □ CPHGE–5L □ CPHJG–5L □ CPHJGE–5L □
KC
0 –0.005
0 –0.005
+ 0.005 0 + 0.01 0 or H7 + 0.005 0 + 0.01 0 or H7 + 0.01 0 or H7
P.277
P.279
4 mm (T4)
－ 0.1 KC 0
–0.01 –0.02
–0.01 –0.02
P.277
P.279
Key flat cutting
SKH51
Two flats cutting Range of designation (DorP)/2 ≦ WKC ＜ H/2
0 –0.005
0 –0.005
P.277
P.279
WKC
6 / 8 mm (JIS)
－ 0.1 WKC 0
–0.01 –0.02
–0.01 –0.02
P.277
P.279
Key flat cutting
Varied dimension key flats cutting Range of designation
CPN–5L □ CPJ–5L □
CPNG–5L □ CPJG–5L □
4 mm (T4)
SKD61 + Nitriding
P.281
P.283
KAC KBC
Reference tolerance
–0.01 –0.02
(DorP)/2 ≦ KAC KAC < KBC < H/2
6 / 8 mm (JIS)
–0.01 –0.02
P.283
P.281
KBC － 0.1 0
KAC － 0.1 0
Key flat cutting
E The tolerance values for shaft diameter are representative ones. For details, refer to the respective standards. ■ Selection method for straight center pins with tip processed ■ Quick Reference Table of Codes for Straight Center Pins with Tip Processed Specifications Shaft Diameter (D) Selection Type CP □ (E) –5L □
Two flats (right angled) key cutting Range of designation (DorP)/2 ≦ RKC < H/2
To designate an arbitrary flat size
RKC
－ 0.1 RKC 0
Key flat cutting
Three flats cutting Range of designation (DorP)/2 ≦ DKC < H/2
DKC
KC
CP □ G (E) –5L □
Shaft Diameter (P) Designation Type
0
DKC － 0.1
DKC
Unit of designation 0.1 mm increments Designation method • VKC1.4 • VWC2.3 • KC1.4 • WKC2.3 • KAC1.4–KBC1.6
Key flat cutting (angled) ± 0.5 0 ° AG ° KGC
Tip process code
Material and Tolerance Codes
Aside from reference plane (0°), an angle for key cutting can be specified.
KGC
Head thickness (T)
Range of designation (DorP)/2 ≦ KGC ＜ H/2 AG = 1° increments 0 < AG < 360
Shaft diameter Tolerance
Shape Tip process code
Material and Tolerance Codes
M Material
C (C chamfered)
Shape
0 –0.005
Key flat cutting (angled)
H
• RKC1.4 • DKC1.7 • KGC1.4–AG85 • KTC2.3
4 mm (T4)
Processed tip
120 °
Three flats cutting at 120° distribution. Range of designation (DorP)/2 ≦ KTC < H/2
KTC
–0.01 –0.02
120 °
HE
G (Cone)
Straight Center Pins
120 °
SKH51
(Shaft diameter)
0
－ 0.1 KTC
0 –0.005
HJ
6 / 8 mm (JIS)
Head diameter change
Reduces the head diameter. Range of designation DorP ≦ HC < H and DorP ≧ 1.5
–0.01 –0.02
HJE
T (Tapered)
Key Alteration
L
Unit of designation 0.1 mm increments
HC
Designation method HC6.5 E In relation to the diameter tolerance, alteration may create a straight piece with little diameter difference between the head and shaft.
4 mm (T4)
N
SKD61 + Nitriding
*Reference tolerance
Head diameter change (precision)
R (R chamfered)
6 / 8 mm (JIS)
–0.01 –0.02
Reduces the head diameter. (Precision) Range of designation DorP + 0.5 ≦ HCC < H−0.3 and DorP ≧ 1.5
J
HCC
Unit of designation 0.1 mm increments
Designation method HCC6.1
B (Spherical)
Head thickness change
Reduces the head thickness to less than standard. Dimension L remains unchanged. Range of designation
TC
Unit of designation 0.1 mm increments
TC
T/2 ≦ TC < T
Designation method TC3.5
■ Material characteristics of center pins
T
E DorP ≧ 1.5 E T–TC ≦ Lmax.–L D owel hole boring E Available when head diameter ≧ 4
Die Steel SKD61 + Nitriding
Dowel hole boring 0 d ＋ 0.1
High Speed Steel SKH51
Machining characteristics
1
3
5
M Material
Designation method NC
NC
T d ℓ 4 2 3 6 3 5 8
(Poor)
(Good)
(Excellent)
X Combination with other than NHC / NHN not available
Surface: 900 HV– Base material: 40–45
58 – 60
H Hardness
HRC
T
1 kgf/mm 2 ＝ 9.81 N/mm 2 1 cal/cm ・ sec ・ °C ＝ 418.6W/(m ・ K) 1 kgf ・ m/cm 2 ＝ 9.81 J/cm 2
Conversion expression
Dowel hole + Spring pin d
Dowel hole boring + Spring pin driving E Available when head diameter ≧ 4
5 4 3 3
4 3 4 3
Abrasion resistance
Designation method NCW
Ability to be mirror–finished
Machining Characteristics
NCW
T d ℓ 1 4 2 5 6 3 8
X Combination with other than NHC / NHN not available
Toughness
Corrosion resistance
T
E Use these data for reference only as it is dependent on specific heat treatment and usage conditions.
[g/cm 3 ]
8.2
7.75
Density
Numbering
Numbering at the back part of the head Electrolytic marking of ID code at the back of the head. (Round-Gothic font in 1.8 mm) Available characters 10 numerals (0 to 9), and 26 Alphabets (A to Z) Range of designation One character when 2 ≦ H < 4.9
Modulus of longitudinal elasticity Coefficient of thermal expansion Thermal conductivity coefficient
[kgf/mm 2 ]
22300
21000
Physical Characteristics
A13
[ × 10 –6 /K (°C)] [cal/cm ・ sec ・ °C]
10.1
10.8
NHC
Two or less characters when 5 ≦ H < 6.9 (Only the first character may be an alphabet.) Three or less characters when 7 ≦ H (Only the first character may be an alphabet.)
3
0.051
0.061
Designation method NHC–6 NHC–23 NHC–A90 E Available when head diameter H ≧ 2 X In some cases, processing is not possible if the back side of the head cannot accommodate the character size of 1.8 in length x 1.8 of width. Automatic sequential numbering on the head Automatically adds sequential numbers at the back of the head of each pin when multiple center pins of identical size are ordered. Available characters Same as NHC (see above) Range of designation Same as NHC (see above) Designation method When 3 pieces are ordered with NHN–1 Sequential numbers starting from 1, 2, 3 are added at the back of each head piece. When 10 pieces are ordered with NHN–A15 Sequential numbers starting from A15, A16, A17...A23, A24 are added at the back of each head piece. E Available when head diameter H ≧ 2 E Only available when two or more pieces of identical size are ordered. X In some cases, processing is not possible if the back side of the head cannot accommodate the character size of 1.8 in length x 1.8 of width.
[kgf/mm 2 ]
235
135
Tensile strength
Mechanical Characteristics
[kgf ・ m/cm 2 ]
2
4
Charpy impact values
Numbering
1
2
3
NHN
A1
A2
A3
275
276
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