Graco 100644 Screw Cap Sch

The Graco 100644 Screw Cap SCH is a precision socket-head cap screw used in multiple Graco systems for secure assembly connections.

Part Number: 100644
Description: Screw, Cap, SCH (Socket-Head)
Thread Size: 1/4-20 UNC
Length: 3/4 inch
Used In: Reactor E20 / E-XP1, LineLazer III 3900/5900, Texture Hopper, HVRh & VPM pumps

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Description

Overview & Key Details for Graco 100644

The Graco 100644 is a factory fastener identified as “Screw, Cap, SCH”—a socket-head cap screw commonly used across multiple Graco assemblies. Typical spec seen in parts lists: 1/4-20 x 3/4 in (length can vary by assembly; always verify against your unit’s parts manual).

Compatible Machines

Verified appearances in Graco parts lists and supplier catalogs. This list is not exhaustive; check your specific model’s manual for position and quantity.

Graco Reactor series: E20 / E-XP1
Graco LineLazer III models: 3900, 5900
Graco Texture Hopper accessory assemblies
Graco HVRh / VPM pump equipment families

Technical Specifications

Brand / OEM	Graco
OEM Part #	100644
Description (Catalog)	Screw, Cap, SCH (socket-head cap screw)
Thread Size	1/4-20 (UNC) (commonly referenced)
Length	3/4 in (commonly referenced; confirm per model)
Typical Use	General fastener for covers, brackets, drive housings, and sub-assemblies on compatible units

Common Locations in Assemblies

Drive housing / cover sections on select LineLazer units
Mounting points within Reactor E20 / E-XP1 frames or sub-assemblies
Hardware groups in Texture Hopper accessories
Fastener positions in HVRh / VPM pump assemblies

What’s Included

Graco 100644 Screw (SCH) — sold individually unless noted otherwise

Frequently Asked Questions

In most references, 100644 corresponds to a 1/4-20 x 3/4 in socket-head cap screw. However, always match the length and grade/material specified by your Graco parts manual for the exact assembly to ensure proper clamping force and safety.

Quantity is assembly-specific. Some diagrams list two or more per location. Check the exploded view for your exact model; look for the item labeled “Screw, Cap, SCH” with part 100644 and note the quantity column.

Use of non-OEM fasteners can affect safety and durability. If you substitute, match thread, length, head style, and grade/material. OEM Graco 100644 ensures correct fit and torque characteristics.

No—this listing is for the screw only. If your diagram calls for washers, spacers, or nuts, order those items separately by their respective part numbers.

Locate your model’s service/parts manual and search for part 100644. Verify the diagram location and quantity. If unsure, share your model and serial with support for confirmation before purchasing.