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Graco 100133 Lock Washer

The Graco 100133 Lock Washer (3/8") is a genuine hardware component designed to prevent loosening under vibration. Perfect for maintaining secure joints in Graco Reactor proportioners and similar systems.

  • Part Number: 100133
  • Size: 3/8″ Lock Washer
  • Used In: Reactor E-20, E-30, E-XP1, E-XP2
  • Function: Prevents bolt and nut back-off during operation
  • Type: Split-style washer for vibration resistance

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Lock Washer 3/8″ — Compatibility & Specs

Compatible Machines

This Graco 100133 Lock Washer (3/8") is used across the Graco Reactor proportioner family and related systems. Confirm via your parts manual before ordering.

  • Graco Reactor E-20
  • Graco Reactor E-30
  • Graco Reactor E-XP1
  • Graco Reactor E-XP2

Product Overview

The Graco 100133 Lock Washer is a split-style lock washer (3/8") designed to maintain clamp load and help prevent loosening from vibration on Graco industrial equipment. Using genuine Graco hardware ensures proper fit and reliability in high-duty applications.

Key Spec Detail
Part Number 100133
Type Lock Washer (Split)
Nominal Size 3/8"
Typical Use Prevents fastener back-off under vibration and thermal cycling on pumps, frames, rams, brackets, and panel hardware.
Compatibility Note Appears in parts lists for Reactor E-20 / E-30 / E-XP1 / E-XP2 and other Graco assemblies that specify 100133.

Fitment Guidance

  • Match the washer to the fastener size: this part is for 3/8" hardware where 100133 is specified.
  • Verify against your unit’s illustrated parts list (IPL) or service manual; look for the exact part number.
  • Replace if the washer shows flattening, cracks, or loss of spring tension.

Frequently Asked Questions

Check your Graco parts manual or IPL for part 100133. If your bill of materials lists “washer, lock, 3/8"” with this number, this is the correct item.

Reuse isn’t recommended if the washer is flattened, cracked, or has lost spring tension. For critical joints, install a new 100133 to maintain proper clamp load.

Follow the torque spec in your equipment manual for the specific joint and bolt grade. Torque values vary by material, coating, and joint design—do not exceed manufacturer recommendations.

A flat washer spreads load and protects surfaces. A lock washer adds spring tension and bite to resist loosening from vibration. Many assemblies use both together.

Yes—if your model’s parts list specifies 100133. This washer appears on multiple Graco assemblies beyond the Reactor series; always confirm with the exact IPL for your unit.

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