Graco 113820 Hex HD Cap Screw – OEM Hex-Head Replacement
The Graco 113820 Hex HD Cap Screw is a precision-engineered, heavy-duty, hex-head fastener designed for use in high-pressure Graco proportioning and power-pack systems. This OEM-quality component ensures reliable sealing, consistent torque, and long-lasting performance in demanding industrial spray applications.
Compatible Machines
- Graco VRM™ Variable-Ratio Metering Proportioner (as per Graco manual 313874)
- Graco VPM™ High-Viscosity Variable-Ratio Proportioner – VPM-12 and VPM-25 models
Key Features
- Precision hex-head design makes installation easy with standard tools.
- Corrosion-resistant finish for extended service life in harsh environments.
- Manufactured to OEM tolerances for exact fit and reliable sealing.
- Heavy-duty alloy steel construction designed for repeated use and torque retention.
- Compatible with high-pressure Graco pump housings, manifolds, and power pack assemblies.
Typical Applications
This cap screw is commonly used in Graco’s industrial proportioners and hydraulic power packs where secure, leak-proof fastening is critical. Its robust design helps maintain chamber integrity, even under the high cycles and pressures typical of plural-component and sealant spraying systems.
Installation & Maintenance
- Use a calibrated torque wrench and apply the correct torque as per your machine’s service manual (e.g., the VRM manual calls out 15 ft-lb for related screws).
- Inspect the screw for thread damage or head wear during routine maintenance.
- Lubrication of the threads may help preserve integrity in chemically aggressive systems.
- When replacing, use only OEM spec parts to ensure seal and structural performance.
Specifications
| Part Number | 113820 |
| Description | Hex-Head Cap Screw (HD) |
| Head Size (approx.) | 0.9 in × 0.9 in |
| Material | Alloy steel with corrosion-resistant plating |
| Finish | Corrosion-resistant plating |
| Torque Spec | Refer to your model’s manual (e.g., 15 ft-lb for certain VRM models) |
Frequently Asked Questions
According to the Graco VRM proportioner parts manual, related hex cap screws are torqued to **15 ft-lb (≈ 20 N·m)**. Always check your specific machine’s service manual for the correct torque.
No — while it’s a genuine Graco OEM cap screw, its documented use is primarily in specific **hydraulic power packs** and **proportioners** (such as VRM and VPM systems). Always verify compatibility via your machine’s parts diagram or service manual.
Replace it if you notice thread wear, corrosion, or deformation of the head. It's also best practice to inspect it whenever you open up the power-pack or pump housing during maintenance.
