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Black steel padlock with 3/4 inch hardened steel shackle

Master Lock

Master Lock 1803BLK Lockout Padlock Steel Black 3/4 in Shackle

SKU CH-R48J-BGD6Z

Steel lockout padlock with 3/4 in hardened shackle and keyed-different security

  • TypeMechanical Push Button
  • Pry-resistant security with hardened steel shackle
  • Keyed-different access control for lockout procedures
  • Compact 15/16 in body fits tight spaces
  • Durable steel construction withstands harsh environments
  • Black finish resists corrosion and wear

Steel lockout padlock for safety procedures

The Master Lock 1803BLK is a steel lockout padlock designed for industrial lockout and tagout programmes. Its keyed-different cylinder ensures each worker holds a unique key, preventing accidental removal by another person. The black finish provides clear visual identification on energy-isolation points.

Pry-resistant body and hardened shackle

A steel body measuring 15/16 in thick resists physical attack while the 5/16 in diameter hardened steel shackle withstands cutting attempts. The open shackle design offers 3/4 in of both horizontal and vertical clearance for fitting through standard hasps and lockout devices. No removable key feature keeps the key retained until the padlock is locked.

Consistent security under repeated daily use

The mechanical push-button mechanism operates without batteries or electronics, so performance does not degrade over long shifts or in harsh environments. Keyed-different cylinders remain isolated from one another, maintaining access control across large teams. The steel construction retains its protective dimensions after thousands of lock and unlock cycles.

Highlights

  • Pry-resistant security with hardened steel shackle
  • Keyed-different access control for lockout procedures
  • Compact 15/16 in body fits tight spaces
  • Durable steel construction withstands harsh environments
  • Black finish resists corrosion and wear

Specifications

BrandMaster Lock
TypeMechanical Push Button

Questions about this item

How do I install the 1803BLK padlock and what step is often missed?

Insert the 5/16 in hardened steel shackle through the hasp or chain link, snap the lock body shut, and turn the key to engage the deadbolt; the step many skip is verifying the shackle fully seats in both locking notches before removing the key.

What maintenance will the 1803BLK need over time?

Apply a light PTFE or graphite lubricant into the keyway and shackle holes every six months to prevent corrosion on the steel body and hardened shackle; no internal parts are user-serviceable.

What limit appears first when the 1803BLK sees heavy daily use?

The 5/16 in shackle diameter and 3/4 in vertical clearance restrict the maximum hasp or chain thickness, so the physical fit fails before the mechanical mechanism wears out.

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