Graco 115643 Screw Machine Hex Washer Head

The Graco 115643 Screw Machine Hex Washer Head is a strong, washer‑head fastener designed for secure, load‑distributed assembly in Graco pumps and spray equipment.

OEM‑specified machine screw with built‑in washer head
Used in pump/valve housings and cover assemblies of Graco diaphragms/pumps
Provides vibration‑resistant, pressure‑safe fastening and reliable performance under load

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Description

Compatible Assemblies for Graco 115643 Screw Machine Hex Washer Head

The Graco 115643 Screw Machine Hex Washer Head is a factory-specified fastener used in various Graco pump and spray-system assemblies to ensure strong, vibration-resistant mounting with even load distribution — thanks to its built-in washer head.

Graco pneumatic/diaphragm pumps and air-valve housings where part #115643 is listed (e.g. inlet/outlet covers, valve covers)
Sprayer and fluid-handling systems requiring secure machine-screw mounting under pressure/ load
Any Graco module with parts-diagram specifying mach-hex-washer-head screw 115643 for structural fastening or cover mounting

Frequently Asked Questions

Because the built-in washer head spreads the load over a larger area, reducing stress on housing or cover surfaces — especially important under fluid pressure or vibration.

Yes — 115643 appears in Graco spare-part catalogs as “SCREW, MACH, HEX WASHER HD,” confirming its OEM status.

Graco 115643 Screw Machine Hex Washer Head

Compatible Assemblies for Graco 115643 Screw Machine Hex Washer Head

Frequently Asked Questions

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Graco 115643 Screw Machine Hex Washer Head

Compatible Assemblies for Graco 115643 Screw Machine Hex Washer Head

Frequently Asked Questions

Why use a hex-washer head screw instead of a plain screw?

Is 115643 a genuine OEM-part from Graco?

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