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Red steel padlock with 3/4 inch hardened steel shackle

Master Lock

Master Lock 1803RED Lockout Padlock Keyed Different Steel Red 3/4 in Shackle

SKU CH-M983-NC231

Steel lockout padlock with a red body, hardened steel shackle and keyed-different cylinder for individual access control

  • TypeMechanical Push Button
  • Pry-resistant hardened steel shackle deters forced entry
  • 3/4 in vertical clearance fits standard lockout points
  • Keyed-different cylinder ensures unique access per padlock
  • Red steel body provides high visibility on site
  • Non-removable key prevents accidental key loss

Lockout Padlock for Safety Procedures

This red steel padlock is built for lockout-tagout programs where each worker must carry a uniquely keyed device. The 3/4 inch shackle fits standard lockout hasps, breaker toggles and valve handles found in industrial and commercial facilities. A hardened steel shackle and pry-resistant body protect against forced removal during maintenance windows.

Upgrade from Keyed-Alike or Plastic Locks

Teams using keyed-alike padlocks or non-conductive plastic bodies should switch when regulations demand individual accountability and metal detection compliance. The keyed-different cylinder ensures no two locks in the same kit share a key, while the all-steel construction survives harsh environments that crack polymer alternatives. The change is justified whenever an audit requires traceable, tamper-evident isolation points.

Fits Standard Lockout Hardware

The 5/16 inch shackle diameter and 3/4 inch vertical clearance slide onto common lockout stations, group lock boxes and cable lockout devices without adapters. A non-removable key prevents accidental key loss while the lock remains engaged, and the red bumper colour-codes the lock for quick visual identification on crowded panels. No special tools or additional hardware are needed for installation.

Highlights

  • Pry-resistant hardened steel shackle deters forced entry
  • 3/4 in vertical clearance fits standard lockout points
  • Keyed-different cylinder ensures unique access per padlock
  • Red steel body provides high visibility on site
  • Non-removable key prevents accidental key loss

Specifications

BrandMaster Lock
TypeMechanical Push Button

Questions about this item

What shackle diameter and clearance does the 1803RED padlock need to fit my hasp?

The hardened-steel shackle is 5/16 in diameter with 3/4 in horizontal and vertical clearance and 5/8 in width across the shackle.

How do I install the lockout padlock and what step is often missed?

Insert the shackle through the isolation point, snap it shut, and turn the key to lock; the key is non-removable while unlocked, so you must relock before pulling the key out.

What part of the 1803RED will need replacement after heavy industrial use?

The 5/16 in hardened-steel shackle and the mechanical push-button cylinder are the wear items; the steel body and red bumper are not serviceable.

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