Graco 15D128 Socket Head Cap Screw (M8 × 18 mm)
The Graco 15D128 Socket Head Cap Screw is a precision fastener designed for secure assembly of Graco equipment components. This OEM‑grade screw ensures reliable, high-strength connections in high‑pressure systems.
Key Features
- M8 (metric) thread size with 18 mm length for compact, reliable fastening
- Socket head design allows torqueing with an Allen (hex) key for precise installation
- High-strength construction designed to withstand mechanical stress and vibration
- Corrosion-resistant finish (depending on manufacturer spec) ensures durability in demanding environments
- OEM part — perfectly suited for original Graco assemblies
Technical Specifications
| Part Number | 15D128 |
| Thread Size | M8 × 1.25 (metric) |
| Length | 18 mm |
| Head Type | Socket (cylindrical) |
| Material | High-tensile alloy / steel (typical for cap screws) |
| Finish | Corrosion‑resistant plating or coating (varies by source) |
Usage & Compatibility
The 15D128 screw is used in critical structural connections within Graco equipment. Based on Graco’s parts manuals, it specifically secures components in the housing assembly of some pump models. For instance, in a Graco pump manual, part 15D128 is listed as an M8 × 18 screw for the pump’s housing.
- Used to mount housing covers, brackets, and internal sub‑assemblies
- Ideal where reliable, torque‑tight fastening is required under vibration or pressure
- OEM replacement ensures proper fit and function in Graco devices
Installation & Maintenance Tips
- Use the correct Allen (hex) key size to avoid stripping the socket head
- Tighten to Graco’s specified torque setting — over-tightening can damage components
- Apply a thread locker (if recommended) to prevent loosening under vibration
- Inspect periodically for corrosion or wear, especially in outdoor or high-moisture environments
- Replace with the exact OEM part to maintain structural integrity and safety
Frequently Asked Questions
The socket head cap screw allows for high torque application via an Allen key and provides a strong, compact fastening solution suited for high-stress assemblies.
It is commonly used in pump housing assemblies for specific Graco pump models, helping to secure critical components under pressure.
Using a generic equivalent may work in some cases, but OEM screws like the 15D128 are specified for their material strength, finish, and dimensional accuracy — replacing with OEM helps ensure safety and longevity.
