4140KA Click to Enlarge


  • A – 6mm (0.25in)
  • B – 21mm (0.81in)
  • C – 21mm (0.81in)
  • Body Width – 40mm (1.56in)

Model No. 4140KA

The Master Lock 40mm brass padlock with keyed alike technology. This function gives school officials key control over ALL locks on that key system.


  • Keyed Alike - Order multiple locks to open with the same key
  • Key control feature achieves supervisory access: One key provides school officials immediate access to all locks matching the existing system or factory assigned
  • Pin tumbler cylinder provides greater pick resistance
  • Hardened steel shackle for excellent cut resistance
  • Brass body and cylinder provide extra resistance to the elements

Best Used For:

  • Cabinets
  • Equipment Storage
  • Fences

How to Order

  1. Download order form .pdf
  2. E-mail your school's purchase order to neworders@mlock.com.
  3. Customer service will call you back to confirm order.

For more information, contact Customer Service at 1-800-227-9599.