Master Lock 6621 Pro Series Key-in-Knob Padlock - Weather Tough

  • 6621 NRWOCN MK 1KEY5

    $22.87 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different + Master Keyed
    Number of Keys
    1
    Number of Pins
    5 Pins
  • 6621 NRWO LFCN MK NOKEY5

    $24.32 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different + Master Keyed
    Number of Keys
    0
    Number of Pins
    5 Pins
  • 6621 NRWO LFCN KAMK 3KEY6

    $27.45 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    3
    Number of Pins
    6 Pins
  • 6621 NR D03 LF KAMK5

    $30.02 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    2
    Number of Pins
    5 Pins
  • 6621 D03 KA 4KEY6

    $30.20 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Yale 8
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Alike
    Number of Keys
    4
    Number of Pins
    6 Pins
  • 6621 D04CN KA 1KEY5

    $29.34 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Schlage C
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Alike
    Number of Keys
    1
    Number of Pins
    5 Pins
  • 6621 NR D03 LF KAMK 4KEY6

    $33.55 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    4
    Number of Pins
    6 Pins
  • 6621WOCN NOKEY6

    $22.03 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different
    Number of Keys
    0
    Number of Pins
    6 Pins
  • 6621WO LFCN KZ5

    $19.88 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Zero-Bitted
    Number of Keys
    2
    Number of Pins
    5 Pins
  • 6621WCSCN NOKEY6

    $20.83 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different
    Number of Keys
    0
    Number of Pins
    6 Pins
  • 6621WCSCN MK 4KEY6

    $25.19 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different + Master Keyed
    Number of Keys
    4
    Number of Pins
    6 Pins
  • 6621WCS LFCN MK NOKEY6

    $24.17 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Body Only
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different + Master Keyed
    Number of Keys
    0
    Number of Pins
    6 Pins
  • 6621 NR D03 LFCN MK 4KEY5

    $34.32 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different + Master Keyed
    Number of Keys
    4
    Number of Pins
    5 Pins
  • 6621 NR D03 LF KAMK 1KEY5

    $30.02 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    1
    Number of Pins
    5 Pins
  • 6621 D03 LF KZ6

    $25.79 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Zero-Bitted
    Number of Keys
    2
    Number of Pins
    6 Pins
  • 6621 NRWCS KAMK6

    $20.89 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    2
    Number of Pins
    6 Pins
  • 6621 NRWCS KAMK NOKEY5

    $19.84 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    0
    Number of Pins
    5 Pins
  • 6621WO KA 1KEY5

    $19.15 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Alike
    Number of Keys
    1
    Number of Pins
    5 Pins
  • 6621WOCN KA NOKEY6

    $22.87 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Alike
    Number of Keys
    0
    Number of Pins
    6 Pins
  • 6621WCS KAMK 3KEY5

    $21.08 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    3
    Number of Pins
    5 Pins
  • 6621 NR D04 LFCN KZ NOKEY5

    $27.41 40% Off

    Function
    Non-Removable Key
    Cylinder
    Schlage C
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Zero-Bitted
    Number of Keys
    0
    Number of Pins
    5 Pins
  • 6621 NR D12CN MK5

    $30.39 40% Off

    Function
    Non-Removable Key
    Cylinder
    Kwikset
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different + Master Keyed
    Number of Keys
    2
    Number of Pins
    5 Pins
  • 6621 NR D03CN KZ6

    $27.00 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Zero-Bitted
    Number of Keys
    2
    Number of Pins
    6 Pins
  • 6621 NRWO 3KEY6

    $20.60 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Different
    Number of Keys
    3
    Number of Pins
    6 Pins
  • 6621 NRWO KA NOKEY6

    $20.20 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Alike
    Number of Keys
    0
    Number of Pins
    6 Pins
  • 6621 NRWO KAMK 3KEY5

    $22.28 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    3
    Number of Pins
    5 Pins
  • 6621 NRWO LF KA 1KEY6

    $21.66 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Alike
    Number of Keys
    1
    Number of Pins
    6 Pins
  • 6621 NRWO LF KAMK 4KEY5

    $24.97 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    4
    Number of Pins
    5 Pins
  • 6621 NR D03 LF KAMK 3KEY5

    $31.26 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    3
    Number of Pins
    5 Pins
  • 6621 NRWCSCN KZ5

    $17.23 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Zero-Bitted
    Number of Keys
    2
    Number of Pins
    5 Pins
  • 6621 NRWCS LFCN KA 1KEY5

    $22.07 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Body Only
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Alike
    Number of Keys
    1
    Number of Pins
    5 Pins
  • 6621 D04CN KAMK 4KEY6

    $34.75 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Schlage C
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    4
    Number of Pins
    6 Pins
  • 6621 D12CN 1KEY5

    $28.50 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Kwikset
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different
    Number of Keys
    1
    Number of Pins
    5 Pins
  • 6621WO KAMK 4KEY6

    $24.56 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    4
    Number of Pins
    6 Pins
  • 6621WO LFCN KAMK 1KEY6

    $26.21 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    1
    Number of Pins
    6 Pins
  • 6621 NR D03 LFCN KA5

    $30.80 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Alike
    Number of Keys
    2
    Number of Pins
    5 Pins
  • 6621 NRWOCN 4KEY6

    $24.50 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different
    Number of Keys
    4
    Number of Pins
    6 Pins
  • 6621 NR D03 LF KAMK 4KEY5

    $32.50 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    4
    Number of Pins
    5 Pins
  • 6621 NR D04 LF 3KEY6

    $29.58 40% Off

    Function
    Non-Removable Key
    Cylinder
    Schlage C
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Different
    Number of Keys
    3
    Number of Pins
    6 Pins
  • 6621 D04CN KZ 4KEY5

    $28.42 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Schlage C
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Zero-Bitted
    Number of Keys
    4
    Number of Pins
    5 Pins
  • 6621WO KZ NOKEY5

    $15.76 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Zero-Bitted
    Number of Keys
    0
    Number of Pins
    5 Pins
  • 6621WCS MK NOKEY6

    $20.05 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Keyed Different + Master Keyed
    Number of Keys
    0
    Number of Pins
    6 Pins
  • 6621WCS LF KZ 3KEY5

    $17.26 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Body Only
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Zero-Bitted
    Number of Keys
    3
    Number of Pins
    5 Pins
  • 6621WCS LFCN MK5

    $23.12 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Body Only
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different + Master Keyed
    Number of Keys
    2
    Number of Pins
    5 Pins
  • 6621 NR D03 LF KAMK NOKEY5

    $30.02 40% Off

    Function
    Non-Removable Key
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    Not Included
    Keying
    Keyed Alike + Master Keyed
    Number of Keys
    0
    Number of Pins
    5 Pins
  • 6621 NRWCS KZ NOKEY6

    $15.61 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    Not Included
    Keying
    Zero-Bitted
    Number of Keys
    0
    Number of Pins
    6 Pins
  • 6621 NRWCSCN KA 1KEY6

    $21.67 40% Off

    Function
    Non-Removable Key
    Cylinder
    Lock Body Only
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Alike
    Number of Keys
    1
    Number of Pins
    6 Pins
  • 6621 D03 LFCN KZ 4KEY5

    $29.88 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Yale 8
    Shackle
    1-1/2" (38mm)
    Chain
    9" Sash Chain
    Keying
    Zero-Bitted
    Number of Keys
    4
    Number of Pins
    5 Pins
  • 6621WOCN 1KEY6

    $22.03 40% Off

    Function
    Non-Key Retaining
    Cylinder
    Lock Without Cylinder
    Shackle
    1-1/8" (29mm)
    Chain
    9" Sash Chain
    Keying
    Keyed Different
    Number of Keys
    1
    Number of Pins
    6 Pins
Showing 1 - 50 of 2867 items

All orders must be in increments of 6

Product Features:

  • Choice of 22 Key-in-Knob keyways to match this padlock to your security door locks. See Related Information for options.
  • Ideal for harsh outdoor conditions - exclusive Weather Tough® cover protects lock from water, ice, dirt and grime
  • ProSeries® Padlocks are designed for Commercial/Industrial applications
  • 2-1/8" (54mm) heavy steel body withstands physical attack
  • 1-1/8" (29mm) tall, 5/16" (8mm) diameter hardened boron alloy shackle for superior cut resistance
  • Horizontal Clearance: 7/8" (22mm)
  • Dual ball locking mechanism resists pulling and prying
  • Lock available with or without cylinder to key at your facility. Accepts Lori® #1539 style cylinder.
  • Rekeyable 5- and 6-pin cylinder options.

Best Used For:

  • Truck Doors
  • Trailers, Vans & Moving Trucks
  • Manufacturing Environments
  • Industrial, Storefront & Business Gates