Detailed diagram showing key mould components used in plastic injection moulding, including core, cavity, runner, and gate system

Key components of a plastic injection mould: core, cavity, runner, gate, and cooling system


High-Quality Parts Begin with Precision Mould Components

Injection moulding is a sophisticated manufacturing process that requires highly precise and durable components to produce high-quality plastic parts. At DSW Mould, we offer an extensive range of mould components specifically designed for plastic injection moulds. This article highlights key components, including mould bases, cavity inserts, ejector plates, and other critical elements, that form the backbone of high-performance injection moulds. We explore the materials used, their heat treatments, and the role each part plays in ensuring smooth and efficient plastic moulding. Whether you are involved in designing or manufacturing injection moulds, understanding these components is crucial for achieving precision, durability, and efficiency in your production processes.

High-Quality Parts Begin with Precision Mould Components

Structural components of a plastic injection mold including mold base, core, cavity, and ejector system
Main Component Function
Mould Base Serves as the foundational structure that houses and supports all other mould components.
Cavity and Core Form the male and female sections of the mould, defining the external and internal geometry of the molded part.
Sprue, Runners, and Gates Provide the flow path for molten plastic from the injection nozzle into the mould cavity.
Ejector System Includes ejector pins and plates that release the molded part from the core after cooling.
Cooling System Circulates water or oil through integrated channels to reduce cycle time and ensure dimensional stability.
Guide Pins and Bushings Maintain precise alignment of the mould halves during opening and closing.
Vents Allow trapped air and gases to escape from the cavity during the injection process, preventing defects.

1. Structural Components

These parts form the backbone of the mould, ensuring stability and support during high-pressure injection cycles.

No. Component Other Names Material Heat Treatment
1 Mould Base Mould Plate / Frame / Tool Base S50C None
2 Fixed Plate A Plate / Cover Plate S50C, P20 None
3 Moving Plate B Plate / Ejector Plate S50C, P20 None
4 Rail Spacer Block / Bar S50C None
7 Bottom Plate Clamping / Back Plate S50C None
34 Stop Plate — S50C None
47 Support Pillar — S50C None
53 Water Jacket — S50C None

2. Core & Cavity Components

These define the shape and precision of the plastic part.

No. Component Other Names Material Heat Treatment
8 Cavity Insert Cover Die Insert H13, 8407, Dievar HRC 44–48
9 Core Insert Ejector Die Insert H13, 8407, Dievar HRC 44–48
10 Slide Insert Slide Core / Tip H13, 8407, Dievar HRC 44–48
11 Cavity Sub-insert — H13, 8407, Dievar HRC 44–48
12 Core Sub-insert — H13, 8407, Dievar HRC 44–48
13 Cavity Pin — SKD61 HRC 64–68 / 40–45
14 Core Pin — SKD61 HRC 64–68 / 40–45
17 Lifter Insert — H13, 8407, Dievar HRC 44–48

3. Injection & Runner System

Guides molten plastic into the cavity under controlled pressure.

No. Component Other Names Material Heat Treatment
19 Cavity Runner Plate FH Runner Plate H13 HRC 44–48
20 Core Runner Plate MH Runner Plate H13 HRC 44–48
25 Sprue Bush — H13 HRC 44–48
26 Sprue Spreader Shot Post H13 HRC 44–48
27 Shot Sleeve Shot Chamber H13 HRC 44–48

4. Ejector System

Ensures smooth part removal after cooling.

No. Component Other Names Material Heat Treatment
5 Ejector Plate — S50C, P20 None
6 Ejector Retainer Plate — S50C None
18 Ejector Sleeve Pin Ejector Sleeve SKD61 HRC 64–68 / 40–45
64 Return Pin — SUJ2 HRC 58–62
65 Ejector Pin — SKD61 HRC 64

5. Alignment & Motion Control

Maintains precise mould alignment and enables sliding/complex movements.

No. Component Other Names Material Heat Treatment
62 Guide Pin — SUJ2 HRC 58–62
63 Guide Bush — SUJ2 HRC 58–62
29 Slide Carrier — H13 HRC 44–48
30 Slide Cam Wedge Block / Jaw H13 HRC 44–48
33 Slide Guider — H13 HRC 44–48
35 Slide Stop Plate — S50C None

6. Cooling & Venting System

Manages temperature and removes trapped gases to prevent defects.

No. Component Other Names Material Heat Treatment
21 Cavity Chill Vent FH Chill Vent H13 HRC 44–48
22 Core Chill Vent MH Chill Vent H13 HRC 44–48
59 Water Tower Water Manifold S50C None
Vents — — — —

Mould Components for Plastic Injection Moulds

Diagram showing the detailed structure of a plastic injection mould including core, cavity, runner, sprue, and ejector pins
No. Item Component Name Other Name Material Heat Treatment
1 Mould Base Mould Plate / Mould Frame / Tool Base / Base Plate Press Plate / Top Tool S50C None
2 Fixed Plate A Plate / Cover Plate S50C, P20 None
3 Moving Plate B Plate / Ejector Plate S50C, P20 None
4 Rail Spacer Block / Bar S50C None
5 Ejector Plate S50C, P20 None
6 Ejector Retainer Plate S50C None
7 Bottom Plate Bottom Clamping Plate / Back Plate S50C None
8 Moulding System Cavity Insert Cover Die Insert H13, 8407, Dievar, 2344ESR, DAC, DAC10 HRC 44-48
9 Core Insert Ejector Die Insert H13, 8407, Dievar, 2344ESR, DAC, DAC10 HRC 44-48
10 Slide Insert Slide Core / Slide Tip Slide Nose / Slide Face H13, 8407, Dievar, 2344ESR, DAC, DAC10 HRC 44-48
11 Cavity Sub-insert Cover Die Sub-insert H13, 8407, Dievar, 2344ESR, DAC, DAC10 HRC 44-48
12 Core Sub-insert Ejector Die Sub-insert H13, 8407, Dievar, 2344ESR, DAC, DAC10 HRC 44-48
13 Cavity Pin Cavity Insert Pin SKD61 HRC 64-68 / 40-45
14 Core Pin Core Insert Pin SKD61 HRC 64-68 / 40-45
15 Slide Pin SKD61 HRC 64-68 / 40-45
16 Date Pin Date Code Pin SKD61 HRC 64-68 / 40-45
17 Lifter Insert H13, 8407, Dievar, 2344ESR, DAC, DAC10 HRC 44-48
18 Ejector Sleeve Pin Ejector Sleeve SKD61 HRC 64-68 / 40-45
19 Injection System Cavity Runner Plate FH Runner Plate H13 HRC 44-48
20 Core Runner Plate MH Runner Plate H13 HRC 44-48
21 Cavity Chill Vent FH Chill Vent H13 HRC 44-48
22 Core Chill Vent MH Chill Vent H13 HRC 44-48
23 Sprue Bush Fixing Plate H13 HRC 44-48
24 Sprue Spreader Fixing Plate H13 HRC 44-48
25 Sprue Bush H13 HRC 44-48
26 Sprue Spreader Shot Post H13 HRC 44-48
27 Shot Sleeve Shot Chamber H13 HRC 44-48
28 Shot Block H13 HRC 44-48
29 Components Slide Carrier H13 HRC 44-48
30 Slide Cam Wedge Block / Jaw H13 HRC 44-48
31 Gib H13 HRC 44-48
32 Wear Plate H13 HRC 44-48
33 Slide Guider Slide Guiding Way H13 HRC 44-48
34 Stop Plate S50C None
35 Slide Stop Plate S50C None
36 Name Plate Mould Plaque / Tool Designation / ID Plate S50C None
37 Mount Plate Support Plate / Dead Plate / Retainer Plate S50C None
38 Cylinder Support Plate Cylinder Mount Plate S50C None
39 Spring Bush Mount Plate S50C None
40 Spring Housing Spring Sleeve / Spring Pocket S50C None
41 Pull Rod Sleeve H13 HRC 44-48
42 Connector Coupler S50C None
43 Lock Plate Lock Block S50C None
44 Rotation-stop Block S50C None
45 Locating Ring S50C None
46 Balance Block S50C None
47 Support Pillar S50C None
48 Support Plate Support Bracket S50C None
49 Cover Plate S50C None
50 Press Block S50C None
51 Lifter Base H13 HRC 44-48
52 Positioning Block Locating Block H13 HRC 44-48
53 Water Jacket S50C None
54 Shim Pad S50C None
55 Heel Block Cushion Block S50C None
56 Limit Block Limit Boss S50C None
57 Fixing Pole S50C None
58 Induction Block S50C None
59 Water Tower Water Manifold S50C None
60 Piston Pillar S50C None
61 Connecting Rod H13 HRC 44-48
62 Guide Pin SUJ2 HRC 58-62
63 Guide Bush SUJ2 HRC 58-62
64 Return Pin SUJ2 HRC 58-62
65 Ejector Pin Ejector SKD61 HRC 64

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