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GUIDE FOR COMPONENTS OF GATE

Pin-point Gate Bushings

Type Shape Material
Part Number
SKH51 Electroforming Carbide
Standard type High hardness type
Material Hard-
ness
Material Hard-
ness
Material Hard-
ness
Material Hard-
ness
SKH51 59~
61HRC
Nickel alloy Inside:
55~60HRC (Depth0.5) Outside:
40~45HRC
Nickel alloy 58~
62HRC (The inner and outer surface have the same hard-
ness)
V40 87~
88HRA (Con-
verted score to
Vickers hard-
ness:
960HV)
B
dimen-
sion selec-
tion type
SR the inside diameter PGHB PGEB PGKB PGWB
Tapered the inside diameter PGHBV PGEBV - -
Tip acute angle B dimen-
sion selec-
tion
SR the inside diameter PGHBZ - - -
Tapered the inside diameter PGHBVZ - - -
B
dimen-
sion designa-
tion type
SR the inside diameter PGH PGE PGK PGW
Tapered the inside diameter PGHV PGEV - -
D dimen-
sion designa-
tion type
PGHD PGED PGKD -
Large K°type PGHF - - -
B
dimen-
sion selec-
tion type
SR the inside diameter PGHT PGET PGKT -
Tapered the inside diameter PGHVT - - -
Lower hole type PGHTBL - - -
Nomal type PGHS
PGXS
PGES PGKS -
With head type PGHST
PGXST
PGEST PGKST -
Blank type - PGEBL
(Published
on Internet)
PGKBL
(Published
on Internet)
-
Corresponding resin(Reference) Resin polycarbonate with glass fiber Normal resin
Non-reinforced resin
Acrylic Reinforced resin with glass fiber supper engineering plastics

Features according to the material of the pinpoint gate bushing (For reference)

·SKH51 (high-speed tool steel)
This steel is generally used as the material for pinpoint gate bushings. It is heat-treated and has excellent hardness and wear resistance.In addition, it is tough and can be readily finished to a high degree of accuracy. Because it has been hardened, any alterations must be performed using electric discharging.

·Electroforming (nickel alloy)
This material features a gate internal surface that has a fine-textured mirror finish. It reduces the risk of mold-release failure, enabling the taper angle of the gate to be reduced and also realizing a fine gate that
can be subjected to a high cycle. However, its wear resistance is inferior to that of the SKH51, so use the SKH51 or a cemented carbide product for molding glass-filled resin or hard resin.

·Cemented carbide
This material is extremely hard, and has very high wear resistance. It can reduce the incidence of deformation or enlargement due to wear of the gate hole during mass-production molding,and also trouble caused by such deformation or enlargement. In the case of a long-life die, this material is particularly effective for improving the stability of gate cutting.

Pin Gate Extension Bushings

Type Shape Part Number Example
SKH51 NAK80
Material Hardness Material Hardness
SKH51 58~60HRC NAK80 37~43HRC
Standard type PGEH PGEN
Reverse tapered type PGEHR PGENR
Headless type PGEHS PGENS

Tunnel Gate BlanksNot available in Europe (EU countries),North America (USA,Mexico,Canada).

Type Shape Part Number Hardness Example
Back gate type MTGCS
MTGC
40HRC~
(U type)
60HRC~
(H type)
Side gate type MSGC 53HRC~

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