Plain
Oil groove
LEADER PINS WITH RECESS DIAMETER − STRAIGHT/PLAIN PRESS−FIT LENGTH DESIGNATION TYPE−
Suitable
Straight Leader Pin
Leader Bushings
B 1mm increments
Diameterofrecess DS 0.01mm increments
Press−fit section Dm5
L 5mm increments
N 1mm increments
Part Number
Slidingpart D
M × Pitch ℓ E
Type
D
+ 0.015 + 0.007
M6 × 1.0 12
*
16
40−200
5−100
15.80−15.95
16
16
−0.020 −0.025
M8 × 1.25 16
20
40−220
5−80
19.80−19.95
20
20
GPSOT
0−100
5
+ 0.017 + 0.008
※ When combining with GC
25
50−260
24.80−24.95
25
25
−0.025 −0.030
GPSOT (Press−fit length Dm5/diameter of recess designation type)
M12 × 1.75 24
5−130
30
70−260
29.80−29.95
30
30
E L ≧ N + B + E + 5 E When B=0, specify BN. E Designate N = 0 when no press−fit section is required
0 －0.01
Diameter of recess ( DS )
C1 M
0.2
Part Number − L − N − B − DS GPSOT30 − 200 − N100 − B10 − DS29.80
Order
Delivery Quotation
ℓ
Sliding part （ D ）
B
N
E
－ 0.5 － 1.0
L
Part Number − L(LC) − N − B(BN) − DS − (MC/OC … etc.) GPSOT25 − LC 168 − N24 − BN − DS24.93 − GC−E20−K10
Alterations
E By specifying the diameter of the recess, it is possible to set the clearance at the guide part to a slightly larger value than the conventional value. E A center hole may be left on one or both ends. E It is possible to eliminate the B dimension (sliding part) by performing alteration BN. E By using the tip tapering (additional machining GC) as well, the effectiveness in preventing scuffing when the guide starts is improved (see photo above). M Material SUJ2 H Hardness 58HRC− (Induction hardening)
Alteration details D P.789 / 790
Alterations Code
Spec.
Alterations Code
Spec.
Total length alteration LC = 1mm increments Shortens the full length L as shown in the drawing. (Tip dimension E remains unchanged.) E Lmin. ＜ LC ＜ Lmax.
L
LC
Tapers the tip Designation method GC−E20−K10 E = 1mm increments K = 1° increments 1° ≦ K ≦ 10°
■ Chart of press−fit tolerance GPSOT
LC
+ 0.025
Tip tapping
M
D M × Pitch ℓ 16 M10 × 1.5 20 20 M12 × 1.75 24 25 M16 × 2.0 32 30
+ 0.020
E E > 20 is available only when L ≧ 50. X Combination with OC not available D E 16 5 ≦ E ≦ 25 20 5 ≦ E ≦ 30 25 5 ≦ E ≦ 35 30 5 ≦ E ≦ 40
MC
GPSOT Default Press−fit section D m5 GPSOT When DKC code is used Press−fit section D + 0.005 0
GC
+ 0.015
ℓ
+ 0.017 + 0.008
+ 0.015 + 0.007
E ±1
+ 0.010
Machining to eliminate sliding part The sliding part is eliminated, so the only specifications are the diameters of the press−fit part and the recess. E BN is indicated as the B dimension. Oil groove processing N + B ≦ L−( ※ ) X Combination with GC not available Alteration details D P.790
E The tapered part is to be cut.
+ 0.005
+ 0.005 0
+ 0.005 0 D20−30
BN
E When combination with MC Alteration details D P.789
0
D16
N
L
■ Features •Prevents scuffing and seizure of the guide due to fluctuation of the guide pin position and the guide bushing hole position caused by thermal expansion of the mold, and realizes appropriate opening and closing of the mold during injection molding. It is possible to use as leader pin for rubber mold.
Press−fit section tolerance alteration D m5 c D + 0.005 0
DKC
（※） OC
N B
N
L
〈 At room temperature 〉 〈 When the temperature rises 〉
Since the clearance can be properly secured even when the temperature rises, the mold can be closed without galling or scuf ng.
Misaligned leader bushing due to thermal expansion of the plate
Leader pin Leader bushing
Leader bushing
Scuf ng and galling
Plate
Outer diameter of a conventional leader pin
Thermal expansion caused by heating
Leader pin for high temperature molding
Misalignment due to thermal expansion: About 0.05−0.3mm (Varies depending on the plate size, steel material, and temperature) ※
• Physical properties of metal material D P.1213 • The appropriate clearance setting differs according to the size of the mold, the type of steel, the mold temperature, the guide pin diameter, etc., so select it accord- ing to the application concerned.
811
812
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