Mold Fasteners
Precision fasteners engineered for injection mold assembly, sealing, and alignment. Hex socket head cap screws, cooling channel screw plugs, heat insulation washers, and dowel pins in JIS and DIN standards.
Fastener Types
Screw Plugs
JIS standard hex socket screw plugs for sealing cooling channels and fluid passages. Long type and seat type configurations.
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Spacers & Washers
Selectable OD washers, countersunk washers, and SUS416 heat insulation washers for controlled spacing and thermal management.
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Bolts
Hex socket head cap screws (standard, small head, flat head), shoulder bolts, and positioning screw plugs for secure mold plate clamping.
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Dowel Pins
h7 tolerance tapped straight dowel pins in 52100 bearing steel for precise mold plate alignment. Easy-removal tapped design.
View Dowel PinsMold Fastener Type Comparison
Each fastener type serves a distinct function in mold assembly. Understanding these roles prevents misapplication:
| Fastener Type | Primary Function | Material | Critical Spec |
|---|---|---|---|
| Screw Plugs | Seal cooling channels and fluid passages | S45C carbon steel | Thread pitch must match drilled/tapped cooling channel port |
| Spacers & Washers | Load distribution, thermal insulation, height adjustment | S45C / SUS416 stainless | SUS416 for heat insulation (low thermal conductivity) |
| Hex Socket Bolts | Clamp mold plates together under injection pressure | SCM435 alloy steel (10.9 grade) | Torque specification per bolt size (see torque guide) |
| Dowel Pins | Align mold plates to prevent lateral shift | 52100 bearing steel (SUJ2) | h7 tolerance ensures repeatable plate alignment |
Fastener Compatibility in the Mold Base
Mold fasteners work as a system. Mismatched components can cause leaks, plate misalignment, or bolt failure under injection pressure:
- Bolts + Washers: Use SUS416 heat insulation washers between bolt heads and heated plates (mold base >80°C). This prevents heat transfer from the mold to the bolt, which can reduce clamping force through thermal expansion.
- Screw Plugs + Cooling Channels: Thread pitch must match exactly. Using a fine-thread plug in a coarse-thread port will leak coolant under pressure. Always verify thread specification before installation.
- Dowel Pins + Bolt Holes: Dowel pins must be installed before bolts. The dowel pin alignment determines the final plate position — bolts only provide clamping force, not alignment.
Engineering Resources
Frequently Asked Questions
What bolt grade should I use for injection mold assembly?+
How do I prevent cooling channel leaks at screw plug locations?+
Why are SUS416 washers used for heat insulation?+
Need a Custom Quote?
Send your specifications and receive a quote. MOQ: 1 piece. Custom dimensions available.