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Yellow steel lockout box with hinged door and stainless steel handle

Master Lock

Master Lock 503YLW Group Lockout Box Yellow 14 Locks

SKU CH-C0AS-CERTK

A yellow steel lockout box that holds up to 14 padlocks and 12 keys for group OSHA 1910.147 compliance

  • Product typeAlignment Tools
  • Secures up to 14 padlocks for group lockout procedures
  • OSHA 1910.147 compliant for workplace safety requirements
  • Powder-coated steel body resists corrosion in harsh environments
  • Wall-mountable design with 12 key hooks for organised access
  • Hinged door accepts shackles up to 5/16 in diameter

Group lockout box for 14 padlocks

The Master Lock 503YLW is a steel group lockout box finished in yellow powder coat. It accepts up to 14 padlocks with a maximum shackle diameter of 5/16 in. The unit complies with OSHA 1910.147 and is designed for wall mounting in industrial safety programmes.

Hinged steel construction with 12 key hooks

The hinged door opens to reveal 12 key hooks inside the back of the box and includes 12 keys. A stainless steel handle provides a secure grip for transport or positioning. Overall dimensions are 12.75 in high, 6.38 in wide and 3.5 in deep, fitting standard wall-mount locations.

Limited to 14 padlocks and 12 key positions

The box cannot accommodate more than 14 padlocks or shackles larger than 5/16 in. Only 12 keys can be stored on the integrated hooks, so larger teams must manage excess keys separately. No electronic locking or audit-trail features are present.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $53.99
Pricier than about 74% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameMaster Lock
Product typeAlignment Tools

Questions about this item

What OSHA standard does the 503YLW group lockout box meet?

The box complies with OSHA 1910.147 for the control of hazardous energy during servicing and maintenance.

What are the wall-mount dimensions for the steel lockout box?

The yellow powder-coated steel box measures 12.75 inches high, 6.38 inches wide and 3.5 inches deep for wall mounting.

How do you load the 12 included keys and 14 padlocks into the hinged-door box?

Open the hinged door, hang each padlock on the internal lock bar, then place the 12 keys on the key hooks at the back of the box.

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