Graco 103961 Hex Hd Cap Screw
$116.50
In Stock
The Graco 103961 Hex Head Cap Screw is a heavy-duty OEM bolt used for securing key pump components in Graco displacement assemblies. It ensures strong structural fastening and proper alignment of housing parts.
- Thread: 3/8-16 UNC-2A (coarse)
- Length: 9 inches (229 mm)
- Use: Structural tie-bolt for pump assemblies
- OEM Quality: Genuine Graco replacement part
Quantity
Genuine OEM Part
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Overview & Key Details
Compatible Machines
Use the list below as a guidance note. Always verify with your sprayer’s parts manual or serial-number lookup before ordering.
- Graco displacement pump assemblies that specify part 103961 for tie-bolt/structural fastening (typically pumps requiring a 3/8-16 UNC-2A × 9 in hex head cap screw).
The Graco 103961 is a Hex Head Cap Screw (HD) used as a structural fastener/tie-bolt in select Graco pump assemblies. In referenced Graco documentation, it appears as 3/8-16 UNC-2A × 9 in (229 mm)—commonly securing major pump housings together. Check your model’s parts diagram to confirm this exact bolt length and thread specification.
Technical Specifications
| Part Number | 103961 |
|---|---|
| Description | Hex Head Cap Screw, HD (Screw, Cap, Hex Hd, Heavy-Duty) |
| Thread | 3/8-16 UNC-2A (coarse) |
| Length | 9 in (≈229 mm) (as referenced in Graco pump documentation; verify for your model) |
| Head Type | Hex Head |
| Typical Use | Structural fastening / tie-bolt for pump housings and intake/outlet bodies in select Graco displacement pumps |
| Category | OEM Graco replacement fastener |
Why this part matters
- OEM-grade fastener that maintains pump alignment and sealing pressure in the assembly.
- Correct length and thread are critical—prevents leaks, vibration, and premature wear.
- Direct reference in Graco parts diagrams for specific displacement pump builds (use your exact model manual to confirm).
Frequently Asked Questions
It depends on your exact model build. Check your sprayer’s parts diagram for the exact part number. If the diagram lists 103961 (and shows 3/8-16 UNC-2A × 9 in), then this is the correct fastener. For variants or different pump stacks, Graco may specify a different length/part number.
103961 typically serves as a heavy-duty tie-bolt that clamps major pump components (e.g., intake/outlet housings and cylinder body). Proper clamping keeps seals aligned and prevents leaks under operating pressure.
Always use the torque spec provided in your model’s service manual. Over- or under-torquing fasteners can cause leaks, misalignment, or thread damage. If the manual doesn’t specify torque, tighten evenly in a cross-pattern and consult a certified Graco technician.
This SKU is for a single Hex Head Cap Screw unless stated otherwise on the product page. Washers, nuts, or additional hardware are sold separately if not explicitly listed.
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