Overview & Compatibility for Graco 103777 — Nut, Full Hex
Compatible Machines
- Graco Falcon / Falcon II piston pump assemblies (e.g., pump model 241516) — referenced in piston repair kits as 103777 Nut, Full Hex.
- Graco Crown Imperial pump series — parts lists for multi-stage variants (6–11 stage, 12–13 stage, 14 stage) include a full-hex nut corresponding to 103777.
Product Summary
The Graco 103777 Nut, Full Hex is a genuine OEM fastener used in select Graco pump assemblies and repair kits. Its full-hex profile provides reliable wrench engagement for assembly and service work on designated pump sub-assemblies.
Key Specifications
| Part Number | 103777 |
| Part Name | Nut, Full Hex (Hex, Full) |
| Thread / Size | 7/16″ (as cited in certain Crown Imperial parts lists; verify for your exact model) |
| Application | Used in Graco pump sub-assemblies (e.g., Falcon/Falcon II piston kits; Crown Imperial multi-stage pumps) |
| Status | Genuine OEM Graco replacement hardware |
Why Choose the OEM 103777 Nut
- Correct fit for listed pump assemblies and repair kits.
- Full-hex design for secure torque and easy serviceability.
- OEM quality helps maintain system reliability and safety.
Fitment Guidance
Always cross-check your machine’s parts manual or exploded diagram. If your model’s list specifies 103777, this is the correct fastener. When part numbers differ by thread or finish, use the exact number shown for your serial range.
Frequently Asked Questions
It fits machines whose official Graco parts lists call out 103777. Confirm by checking your model’s manual or diagram. If needed, share your model and serial range and we’ll verify the listing for you.
Certain Graco parts lists (e.g., Crown Imperial) cite a 7/16″ hex nut in this position. Because hardware can vary by sub-assembly, verify the thread spec shown in your machine’s manual before purchase.
Yes. Graco 103777 is an OEM fastener. Using OEM hardware maintains compatibility and performance on Graco pump assemblies.
Clean threads, start by hand to avoid cross-threading, then torque per the service manual. If a thread-locking compound is specified for the sub-assembly, use the grade recommended by Graco.
Use the exact part number shown for your model and serial range. If your list shows an alternative or superseded number, contact support and we’ll match the correct Graco hardware.
