Graco 100643 — Screw, Cap, SCH (Overview & Compatibility)
The Graco 100643 Screw, Cap, SCH is a high-strength socket-head cap screw commonly used across multiple Graco assemblies. Typical spec is 1/4-20 x 1 in., suitable for structural fastening within frames, guards, and sub-assemblies.
Compatible Machines
Confirmed appearances in Graco manuals/parts lists and widely used in these platforms:
- Gusmer GX-7A
- Gusmer GX-7 DI
- Gusmer GX-7 400
- Probler P2
- Fusion AP (Air Purge) Series
- Fusion CS (ClearShot) Series
- Fusion FX Series
- D-Gun
- Pro Connect (PC) Series
- Therm-O-Flow 200 Supply Unit
Key Features
- OEM fit: Direct replacement for Graco 100643 in supported assemblies.
- Socket-head design: Allows higher torque and compact clearance.
- Typical spec: 1/4-20 UNC thread, approx. 1 in. length (verify against your manual).
- Multi-platform use: Appears across plural-component, foam, and electric/heated systems.
Specifications
| Graco Part # | 100643 |
| Type | Screw, Cap, SCH (socket-head cap screw) |
| Thread | 1/4-20 UNC (typical) |
| Length | 1 in. (typical) |
| Application | Structural fastening in gun, pump, and system sub-assemblies |
| Material/Finish | High-strength steel (verify finish per your manual) |
Install Notes & Best Practices
- Confirm the thread size, length, and any washer/lock-washer requirements in your machine’s manual.
- Tighten to the specified torque to avoid thread damage or loosening under vibration.
- When servicing multiple fasteners, replace in sets to maintain clamping force and alignment.
Frequently Asked Questions
In many non-critical locations, the dimensions match. However, using the OEM 100643 ensures proper material grade, finish, and fit validated by Graco. Always prioritize OEM in safety-critical assemblies.
Most applications call for medium-strength threadlocker on vibrating assemblies. Some locations may require none. Always follow the machine’s service manual.
Torque varies by sub-assembly and material stack. Check the exact model manual (gun, pump, or system frame) for the specified value and tightening sequence.
The standard part is high-strength steel. For corrosive environments, verify if a coated or stainless variant is specified for your assembly. Do not substitute materials without consulting the manual.
