Safety Padlocks to complement any lockout program

  • Designed for safety lockout
  • Full customization options
  • Durable to withstand tough environments
  • Annually validated by UL Environment for recycled content
Master Lock Safety Solutions
Expand to learn more Plated boron alloy shackle Expand to learn more Available in 8 colors Expand to learn more Durable, lightweight thermoplastic lock body for excellent corrosion resistance in harsh conditions Expand to learn more Anodized aluminum finish available in 9 colors Expand to learn more Durable aluminum construction for supreme corrosion resistance. Optional cover for enhanced protection Expand to learn more Plated boron alloy shackle Expand to learn more Master Lock 410 Series has been awarded an environmental claim validation from UL Environment Expand to learn more American Lock S1100/A1100 Series has been awarded an environmental claim validation from UL Environment

Choose your Padlock Material, Color and Shackle Height

Differentiate your padlocks with a variety of customization options

  • Plastic Padlock
    Plastic Padlock Color Options: Red
    • Red
    • Yellow
    • Purple
    • Blue
    • Orange
    • Teal
    • Black
    • Green
    Shackle Height:
    • 38.1mm
    • 76.2mm
  • S1100 S-Series
    Aluminum Padlock Color Options: Blue
    • Red
    • Yellow
    • Purple
    • Blue
    • Orange
    • Brown
    • Black
    • Green
    • Clear
    Shackle Height:
    • 25.4mm
    • 38.1mm
    • 76.2mm

Wide range of color options to match existing safety lockout color systems and even allows for easy identification of multiple types of authorized personnel.

Find out which safety padlock is right for you

Ultimate Key Integrity

Over 40,000 key changes available to meet virtually any system design

  • Comply with the one-lock, one-key per employee mantra
  • Free LifeGuard key charting service helps track all safety padlock key codes assigned to your facility and prevents unwanted key duplication
  • Keyed Different

    Keyed Different

    Each lock is opened by its own unique key which does not open any other lock in the set.

  • Keyed Alike

    Keyed Alike

    All padlocks in the set are opened by the same key - only one key is necessary to open numerous padlocks.

  • Master Keyed

    Master Keyed

    A master key opens all locks within the system while each lock also has its own unique key.

Master Keyed Expand to learn more Controlled keyway is only available through Master Lock, eliminating unwanted field duplicates Expand to learn more Complimentary LifeGuard™ key record keeping ensures keys are not duplicated within a facility.

Custom Lock Identification

Clearly identify employees and isolation points within your facility

Laser Engraving

Laser Engraving

Permanent, durable addition of name, logo, key number or other important information

Padlock Labels

Padlock Labels

Add write-on and photo ID labels for easy employee identification

Key Stamping

Key Stamping

Engrave identification information directly onto key head

Padlock Tags

Padlock Tags

Engrave brass tags and permanently apply to padlock

Commitment to the environment

UL Environment awards Master Lock Safety Padlocks* with Environmental Claim Validation

  • Reduce – Our Master Lock Safety thermoplastic padlock bodies are molded using a hot runner injection molding process that results in virtually no scrap metal
  • Reuse – Precision engineering, durable materials and recommended padlock maintenance ensure all Master Lock Safety padlocks are long lasting
  • Recycle – Master Lock safety padlocks use a high percentage of recycled metal. Steel shackles, brass keys and cylinders, as well as our aluminum lock bodies are all manufactured using recycled material. These padlocks maintain a minimum amount of recycled content, with some at 65%!
  • Want to learn more about UL Environment? Visit the UL Environment website!
S31 Series UL Environment logo
S31 Series UL Environment logo 1100 Series UL Environment logo 1100 Series UL Environment logo 50% recycled content 411 Series UL Environment logo 410 Series UL Environment logo 406 Series UL Environment logo

*Does not include Master Lock Safety Padlock Series #3, S32 and S33

Print banner

Print this page Print Specs

Padlock Features

Customization options to meet your lockout system requirements

S1105 410
Series No. S1100 410
Colors Black, Blue, Brown, Clear, Green, Orange, Purple, Red, Yellow Red, Yellow, Green, Teal, Black, Blue, Purple, Orange
Body Material Anodized Aluminum Thermoplastic
Shackle Diameter 1/4" (6.35mm) 1/4" (6.35mm)
Model Number /
Shackle Height
  • S1105
    1.0" (25.4mm)
  • S1106
    1.5" (38.1mm)
  • S1107
    3.0" (76.2mm)
  • 410
    1.5" (25.4mm)
  • 410LT
    3.0" (76.2mm)
Shackle Material Boron Steel Plated Metal
Key Changes 40,000+ 40,000+
Key Retaining Yes Yes
No. of Keys 1 (Additional keys available as option) 1 (Additional keys available as option)
Re-keyable Yes No
Weather Cover S101 (Optional) 400Covers (Optional)
Photo ID Labels 6835-5700 (Optional) S142 (Optional)
Keyway W401/W417 Exclusive safety keyway W401/W417 Exclusive safety keyway
Key System Keyed Different, Keyed Alike, Master Keyed Keyed Different, Keyed Alike, Master Keyed
Lifeguard™ Key Charting Service Included free of charge Included free of charge