Choose the Best Padlock


Master Lock offers the widest variety of padlock styles, materials and keying options of any manufacturer. How do you know which lock is the best choice for your needs? Consider your application, the environment and the size or space requirements the lock needs to fit. Then, choose the lock with the material and size that match your needs.

ProSeries Padlocks
Lock Style & Materials
ProSeries® high security padlocks are available in five styles including Weather Tough®, High Security Iron Shroud, Solid Steel, Solid Brass and Solid Aluminum. All ProSeries padlocks feature:
  • Hardened boron alloy shackles for superior cut resistance
  • Dual ball locking mechanisms that resist pulling and prying
  • Rekeyable ProSeries cylinders
  • 5-pin and 6-pin cylinders provide tens of thousands of key changes
  • Spool pins are virtually impossible to pick

Commercial grade laminated steel padlocks include hardened bottom plates with anti-drill keyway to provide security not available elsewhere. This padlock family has options including: Laminated Padlocks
  • Body widths from 1-9/16" to 2-1/2"
  • Hardened steel or boron alloy shackles
  • 4-pin and 5-pin cylinders
  • Rekeyable or non-rekeyable models

Laminated brass padlocks offer excellent corrosion resistance for marine environments. This padlock family has options including:
  • Body widths from 1-9/16" – 2"
  • Hardened steel shackles or optional brass shackles
  • 4-pin and 5-pin cylinders
  • Rekeyable or non-rekeyable models

Optional Shackles Optional Shackle Lengths
Many Master Lock padlocks are available with extra long or short shackles to provide sufficient reach to lock around the application. The shackle length is measured from the top of the lock body to the inside of the shackle. The standard length varies by product and the optional lengths are designated in the product number: ie 3LF. Some common lengths and designations are:
  • LS: 3/4" (19mm)
  • LF: 1-1/2" - 1-9/16" (38mm - 40mm)
  • LH: 2" (51mm)
  • LJ: 2-3/8"- 2-1/2" (60mm - 64mm)
  • LT: 3" (76mm)
  • LN: 5-3/8"- 5-3/4" (14cm - 15cm)
Custom Marking
Custom Marking
To customize your locks, you can laser engrave up to six areas on your Weather Tough®, Shrouded, Brass or Aluminum ProSeries® padlocks. Engrave your company logo or any alphanumeric characters for safety lockout purposes, employee or department identification or company or institutional/school branding.

Keys can be hard stamped to include up to eight characters such as a name or key number.

For custom laser engraving information, please click here for Weather Tough® and Shrouded ProSeries and click here for Brass and Aluminum ProSeries.