The Graco 100521 Screw Cap Hex HD is a genuine OEM fastener designed for reliable performance in various Graco assemblies. Perfect for securing pump frames, manifolds, and other structural components.
The Graco 100521 Screw Cap Hex HD appears in multiple Graco parts lists. Confirm your parts manual before ordering.
The Graco 100521 Screw, Cap Hex Head (HD) is a factory-spec fastener used across various Graco assemblies. Its hex head design and 5/16-18 UNC threading provide dependable clamping for pump frames, manifolds, and component clusters where OEM hardware is required.
| Part Number | 100521 |
|---|---|
| Description | Screw, Cap Hex HD (Hex-head cap screw) |
| Thread | 5/16-18 UNC (coarse) |
| Typical Length | Commonly referenced near 7/8 in. in some listings (verify in your manual) |
| Use Case | Fastening of pump frames, manifolds, and component clusters on Graco equipment |
| Origin | Genuine Graco replacement part |
What’s Included
| Question | Answer |
|---|---|
| Is 100521 universal across all Graco sprayers? | No. It is used on many models, but you must confirm your exact model’s parts list before ordering. |
| What thread does it use? | 5/16-18 UNC (coarse). Confirm the required length for your assembly. |
| Can I substitute a hardware-store bolt? | Using non-OEM hardware risks mismatched thread class, material, or head profile. For safety and reliability, use the OEM Graco 100521. |
| Where can I find confirmation it fits my unit? | Check your unit’s official Graco parts manual and verify that 100521 is listed for your model. |
| Do I need threadlocker? | Only if specified by your manual. Many assemblies rely on proper torque and washers; follow the manufacturer’s guidance. |
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