Spacers & Washers for Plastic Mold
Precision washers and spacers for injection mold assembly, including selectable OD washers for load distribution, countersunk washers for flush bolt installations, and SUS416 stainless steel heat insulation washers for thermal management.
Spacers & Washers
SW Type Selectable OD Washers — S45C Steel
Selectable outer diameter washers and spacers for stable assembly and load distribution. S45C steel.
Free Washers for Countersunk Bolts — S45C Steel
Countersunk profile washers for flush bolt installations. S45C steel with reliable load distribution.
SUS416 Heat Insulation Countersunk Washers
Heat insulation countersunk washers for riser pads. SUS416 stainless steel reduces heat transfer.
SUS416 Heat Insulation Washers — Plain/Countersunk/Counterbore
Configurable heat insulation washers in plain, countersunk, and counterbore profiles. SUS416 stainless.
Washer Type Comparison — Standard, Countersunk & Heat Insulation
| Washer Type | Material | Profile | Thermal Conductivity | Best Application |
|---|---|---|---|---|
| SW Type Selectable OD | S45C Carbon Steel | Standard flat | 51.9 W/m·K (no insulation) | General mold assembly, load distribution under bolt heads |
| Countersunk Washer | S45C Carbon Steel | Countersunk (flush) | 51.9 W/m·K (no insulation) | Parting line bolts where head must not protrude |
| SUS416 Heat Insulation — Plain | SUS416 Stainless | Standard flat | 24.9 W/m·K (52% reduction) | Heated mold plate connections — general |
| SUS416 Heat Insulation — Countersunk | SUS416 Stainless | Countersunk (flush) | 24.9 W/m·K (52% reduction) | Heated mold riser pads — flush mounting |
| SUS416 Heat Insulation — Counterbore | SUS416 Stainless | Counterbore | 24.9 W/m·K (52% reduction) | Heated molds — recessed bolt head applications |
Why SUS416 Heat Insulation Washers Reduce Energy Loss
In injection molds, bolt connections create thermal bridges between the heated mold plates and the machine platens. Each standard carbon steel bolt and washer acts as a heat conductor, transferring energy away from the mold cavity:
- Carbon steel (S45C): Thermal conductivity = 51.9 W/m·K. Heat flows freely through the fastener connection.
- SUS416 stainless: Thermal conductivity = 24.9 W/m·K. Approximately 52% less heat transfer than carbon steel.
By placing SUS416 washers between bolt heads and mold plates, you create a thermal break that reduces energy loss by 15-25% at each fastener location. In a mold with 20+ bolt connections, this translates to measurable energy savings and more uniform mold temperature distribution.
Application Scenarios
Heated Mold Thermal Management
Pain point: Mold temperature varies across the cavity surface due to heat loss through bolt connections, causing uneven part quality.
Why it fits: SUS416 washers at every bolt location create thermal breaks that reduce localized heat loss by up to 52%, improving temperature uniformity across the mold.
Recommended: SUS416 Heat Insulation Washers, configurable profile
Flush Bolt Installations
Pain point: Standard washers protrude above the mold surface, interfering with plate stacking or parting line contact.
Why it fits: Countersunk washers sit flush with the plate surface, providing load distribution without protruding above the bolt counterbore.
Recommended: S45C Countersunk Washers for standard applications; SUS416 Countersunk for heated molds
Engineering Resources
Frequently Asked Questions
What is the hardness of SUS416 heat insulation washers?+
Can I use standard carbon steel washers instead of SUS416 for heat insulation?+
How do I select the correct washer OD?+
Need a Custom Quote?
Send your specifications and receive a quote. MOQ: 1 piece. Custom dimensions available.