Posi-Seal Valve Lock Washer – 5/16" (Replaces Schmidt Axxiom 7028-551)

Model: 888-7028-551PB
Category: Surface Preparation → Sandblasting Equipment → Valve Hardware & Fasteners
Type: Lock Washer (5/16" Fastener Component)

The Posi-Seal Valve Lock Washer – 5/16" (Pirate Brand) is a critical fastening component designed to prevent loosening of bolts under vibration and pressure in Posi-Seal double seal valve assemblies. Used alongside 5/16" bolts, this lock washer ensures secure clamping force, stable assembly, and long-term reliability in abrasive blasting systems.

Key Features & Benefits

• OEM-compatible replacement for Schmidt / Axxiom 7028-551
• Designed for 5/16" fastener applications
• Prevents loosening from vibration and pressure
• Maintains consistent clamping force for proper sealing
• Ideal for Posi-Seal double seal valve assemblies
• Pirate Brand durable replacement hardware
• Essential for maintenance and rebuild applications

Technical Specifications

Product Name: Posi-Seal Valve Lock Washer
Model / Part Number: 888-7028-551PB
Size: 5/16"
Weight: 0.10 lbs
Material: Hardened Steel
Brand: Pirate Brand
Function: Fastener Retention / Anti-Loosening
Compatibility: Posi-Seal Double Seal Valves
OEM Cross Reference:

• Schmidt / Axxiom / U.S. Filter: 7028-551
  Application: Sandblasting / Abrasive Blasting Systems
  Condition: New

Typical Applications

• Replacement of worn or missing lock washers
• Posi-Seal valve assembly and rebuilds
• Industrial abrasive blasting equipment
• High-vibration and high-pressure fastening systems

Performance Benefits

• Prevents fastener loosening under vibration
• Maintains tight and secure assembly
• Supports proper sealing and pressure integrity
• Reduces risk of leaks and structural issues
• Extends lifespan of assembled components