Graco 15F639 Locking Nut 1/2-13 2B

Product Overview

The Graco 15F639 Locking Nut 1/2‑13 2B is a genuine OEM locking nut designed to secure threaded connections in spray‑equipment assemblies, particularly where a 1/2‑13 thread specification is required. The locking‑nut design helps resist loosening under vibration or repeated use, providing a reliable and stable fastening solution for fluid or mechanical connections. This part is ideal for maintenance or rebuilds requiring secure thread fastening and helps maintain safe and leak‑free operation in demanding spray‑equipment environments.

Key Features

• OEM locking nut — part no. 15F639
• Thread size 1/2‑13 2B, matching standard Graco threaded fittings
• Designed to prevent loosening under vibration or repeated use
• Ensures secure, leak‑resistant connections in spray‑system assemblies
• Durable metal construction for long service life

Technical Specifications

Installation / Usage Instructions

To install or replace the 15F639 Locking Nut:

• Ensure the mating threads or fitting are clean and free of debris.
• Thread the 15F639 nut onto the fitting/thread by hand until snug.
• If required, tighten to manufacturer‑recommended torque while avoiding over‑tightening that might damage threads.
• After installation, inspect for secure fit — check for leaks or loosening periodically during use or maintenance cycles.

Frequently Asked Questions