Graco 100643 Screw Cap Sch

The Graco 100643 Screw, Cap, SCH is a durable socket-head cap screw used in various Graco assemblies for secure fastening. Ideal for plural-component systems and spray guns.

Part Number: 100643
Thread: 1/4-20 UNC
Length: 1 inch
Used In: GX-7A, Fusion AP/CS/FX, Probler P2, Therm-O-Flow 200, and others

$9.37

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Description

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.