Shop master lock box

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$54.00
Master Lock Resettable Combo Padlock - 1" Shackle - ULINE - Qty Of 3
Uline
$54.00
Master Lock Resettable Combo Padlock - 1" Shackle - ULINE - Qty Of 3
Uline
$92.00
Group Lock Box - Master Lock
Uline
$92.00
Group Lock Box - Master Lock
Uline
$420.00
Lockout/Tagout Wall Mount Station - 10-Lock - Master Lock
Uline
$420.00
Lockout/Tagout Wall Mount Station - 10-Lock - Master Lock
Uline
$225.00
Lockout/Tagout Wall Mount Station - 4-Lock - Master Lock
Uline
$225.00
Lockout/Tagout Wall Mount Station - 4-Lock - Master Lock
Uline
$57.00
Master Lock Wall-Mount Key Lock Box - 3X1 1/2X5" - ULINE
Uline
$57.00
Master Lock Wall-Mount Key Lock Box - 3X1 1/2X5" - ULINE
Uline
$280.00
Master Lock Bluetooth Key Lock Box - ULINE
Uline
$280.00
Master Lock Bluetooth Key Lock Box - ULINE
Uline
$273.30
Master Lock Lock Box: Digital Combo Lock, 5 Key Capacity, 5 in Outside Ht, 3 1/4 in Outside Wd, Gray Model: 5441ECWWG
Grainger
$273.30
Master Lock Lock Box: Digital Combo Lock, 5 Key Capacity, 5 in Outside Ht, 3 1/4 in Outside Wd, Gray Model: 5441ECWWG
Grainger
$57.32
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 4 5/8 in Outside Ht, Metal, Black Model: 5423D
Grainger
$57.32
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 4 5/8 in Outside Ht, Metal, Black Model: 5423D
Grainger
$61.47
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 6 1/4 in Outside Ht, Metal, Black Model: 5400D
Grainger
$61.47
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 6 1/4 in Outside Ht, Metal, Black Model: 5400D
Grainger
$123.66
Master Lock Group Lockout Box: Steel, Yellow, 12.75 in X 6.38 in 3.5 In, Wall, Hinged, 14 Padlocks Model: 503YLW
Grainger
$123.66
Master Lock Group Lockout Box: Steel, Yellow, 12.75 in X 6.38 in 3.5 In, Wall, Hinged, 14 Padlocks Model: 503YLW
Grainger
$301.88
Master Lock Lock Box: Mechanical Combo Lock, 6 Key Capacity, 5 in Outside Ht, 2 7/8 in Outside Wd Model: 5425D
Grainger
$301.88
Master Lock Lock Box: Mechanical Combo Lock, 6 Key Capacity, 5 in Outside Ht, 2 7/8 in Outside Wd Model: 5425D
Grainger
$65.53
Master Lock No. 5401D 4-Digit Locking Combination Wall Mount Keylock Box - Holds 1-5 Keys
Global Industrial
$65.53
Master Lock No. 5401D 4-Digit Locking Combination Wall Mount Keylock Box - Holds 1-5 Keys
Global Industrial
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We put the classic Master Lock 5400 series combo box under the microscope and decoded it step-by-step. No force, no destruction—just technique. This video breaks down how the internal wheels behave, what to feel for, and how a simple decoding method can bypass most common combination lock boxes. If you’re learning lockpicking, physical security, or just want to understand how these mechanisms really work, this one’s for you. ⚠️ For educational and security testing only. Always practice on locks
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How to open a 3 digit Masterlock!!! 🧩‼️🔓 Getting this classic lock open can be simple once you know the right sequence of turns. Here’s a guide to help you with your three-number dial combination lock. 1. Clear the lock Turn the dial to the right (clockwise) at least three times to clear previous settings. 2. Enter the the first number Continue turning the dial clockwise. Stop when you hit your first combination number. 3. Enter the second number Turn the dial to the left, counter clockwise an
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Shop master lock box

Sponsored
About our ads
$118.08
Master Lock Group Lockout Box: Steel, Red, 12.75 in X 6.38 in 3.5 In, Wall, Hinged, 14 Padlocks Model: 503RED
Grainger
$118.08
Master Lock Group Lockout Box: Steel, Red, 12.75 in X 6.38 in 3.5 In, Wall, Hinged, 14 Padlocks Model: 503RED
Grainger
$50.78
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 4 3/4 in Outside Ht, Metal, Black Model: 5401D
Grainger
$50.78
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 4 3/4 in Outside Ht, Metal, Black Model: 5401D
Grainger
$124.07
Master Lock Group Lockout Box: Stainless Steel, Red, 6.88 in X 8.38 in 4 In, Wall, Hinged, English Model: S3650
Grainger
$124.07
Master Lock Group Lockout Box: Stainless Steel, Red, 6.88 in X 8.38 in 4 In, Wall, Hinged, English Model: S3650
Grainger
$130.46
Master Lock Group Lockout Box: Stainless Steel, Red, 5.67 in X 6.42 in 12 In, Portable, Hinged Model: S600
Grainger
$130.46
Master Lock Group Lockout Box: Stainless Steel, Red, 5.67 in X 6.42 in 12 In, Portable, Hinged Model: S600
Grainger
$65.53
Master Lock No. 5401D 4-Digit Locking Combination Wall Mount Keylock Box - Holds 1-5 Keys
Global Industrial
$65.53
Master Lock No. 5401D 4-Digit Locking Combination Wall Mount Keylock Box - Holds 1-5 Keys
Global Industrial
$168.75
Master Lock Group Lockout Box: Stainless Steel, Red, 13.69 in X 12.13 in 4.69 In, Wall, Hinged Model: S3502
Grainger
$168.75
Master Lock Group Lockout Box: Stainless Steel, Red, 13.69 in X 12.13 in 4.69 In, Wall, Hinged Model: S3502
Grainger
$124.00
Master Lock S3650 Group Lock Box, Wall Mounted, Red
Global Industrial
$124.00
Master Lock S3650 Group Lock Box, Wall Mounted, Red
Global Industrial
$87.43
Master Lock Wall Mount Lock Box, 3"W X 2-3/16"D X 5-3/8"H, Black, 5481D
Global Industrial
$87.43
Master Lock Wall Mount Lock Box, 3"W X 2-3/16"D X 5-3/8"H, Black, 5481D
Global Industrial
$49.99
Master Lock 3.13 in. W Metal 4-Digit Combination Lock Box
Ace Hardware
922
$49.99
Master Lock 3.13 in. W Metal 4-Digit Combination Lock Box
Ace Hardware
$109.95
Master Lock Latch Tight Group Lock Box, Portable, Red, 498A
Global Industrial
$109.95
Master Lock Latch Tight Group Lock Box, Portable, Red, 498A
Global Industrial
$58.95
Master Lock Compact Group Lock Box, Portable Or Wall Mounted, Thermoplastic, S3570
Global Industrial
$58.95
Master Lock Compact Group Lock Box, Portable Or Wall Mounted, Thermoplastic, S3570
Global Industrial
$49.99
Master Lock 4-5/8 in. H X 3.13 in. W X 2-1/16 in. L Metal 4-Digit Combination Lock Box
Ace Hardware
346
$49.99
Master Lock 4-5/8 in. H X 3.13 in. W X 2-1/16 in. L Metal 4-Digit Combination Lock Box
Ace Hardware
$64.99
Master Lock 2.88 in. W Metal 4-Digit Combination Lock Box
Ace Hardware
27K+
$64.99
Master Lock 2.88 in. W Metal 4-Digit Combination Lock Box
Ace Hardware
$29.99
Master Lock 0.38 Cu Ft Combination Lock Black Personal Safe
Ace Hardware
16K+
$29.99
Master Lock 0.38 Cu Ft Combination Lock Black Personal Safe
Ace Hardware
$199.99
Master Lock 5 in. H X 3-1/4 in. W X 2-5/16 in. L Steel 4-Digit Combination Bluetooth Lock Box
Ace Hardware
$199.99
Master Lock 5 in. H X 3-1/4 in. W X 2-5/16 in. L Steel 4-Digit Combination Bluetooth Lock Box
Ace Hardware
$258.45
Master Lock Black Metal Bluetooth Lock Box
Airgas
$258.45
Master Lock Black Metal Bluetooth Lock Box
Airgas
$80.73
Master Lock Lock Box: Mechanical Combo Lock, 6 Key Capacity, 7 1/8 in Outside Ht, 2 in Outside Wd Model: 5424D
Grainger
$80.73
Master Lock Lock Box: Mechanical Combo Lock, 6 Key Capacity, 7 1/8 in Outside Ht, 2 in Outside Wd Model: 5424D
Grainger
$294.94
Master Lock Electronic Lock Box 5" H X 3-1/4" W X 2-5/16" L Die-Cast Zinc 4-Digit Combination Bluetooth Electro Black 5441EC
DkHardware.com
$294.94
Master Lock Electronic Lock Box 5" H X 3-1/4" W X 2-5/16" L Die-Cast Zinc 4-Digit Combination Bluetooth Electro Black 5441EC
DkHardware.com

Shop master lock box

Sponsored
About our ads
$54.00
Master Lock Resettable Combo Padlock - 1" Shackle - ULINE - Qty Of 3
Uline
$54.00
Master Lock Resettable Combo Padlock - 1" Shackle - ULINE - Qty Of 3
Uline
$92.00
Group Lock Box - Master Lock
Uline
$92.00
Group Lock Box - Master Lock
Uline
$420.00
Lockout/Tagout Wall Mount Station - 10-Lock - Master Lock
Uline
$420.00
Lockout/Tagout Wall Mount Station - 10-Lock - Master Lock
Uline
$225.00
Lockout/Tagout Wall Mount Station - 4-Lock - Master Lock
Uline
$225.00
Lockout/Tagout Wall Mount Station - 4-Lock - Master Lock
Uline
$57.00
Master Lock Wall-Mount Key Lock Box - 3X1 1/2X5" - ULINE
Uline
$57.00
Master Lock Wall-Mount Key Lock Box - 3X1 1/2X5" - ULINE
Uline
$280.00
Master Lock Bluetooth Key Lock Box - ULINE
Uline
$280.00
Master Lock Bluetooth Key Lock Box - ULINE
Uline
$273.30
Master Lock Lock Box: Digital Combo Lock, 5 Key Capacity, 5 in Outside Ht, 3 1/4 in Outside Wd, Gray Model: 5441ECWWG
Grainger
$273.30
Master Lock Lock Box: Digital Combo Lock, 5 Key Capacity, 5 in Outside Ht, 3 1/4 in Outside Wd, Gray Model: 5441ECWWG
Grainger
$57.32
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 4 5/8 in Outside Ht, Metal, Black Model: 5423D
Grainger
$57.32
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 4 5/8 in Outside Ht, Metal, Black Model: 5423D
Grainger
$61.47
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 6 1/4 in Outside Ht, Metal, Black Model: 5400D
Grainger
$61.47
Master Lock Lock Box: Mechanical Combo Lock, 5 Key Capacity, 6 1/4 in Outside Ht, Metal, Black Model: 5400D
Grainger
$123.66
Master Lock Group Lockout Box: Steel, Yellow, 12.75 in X 6.38 in 3.5 In, Wall, Hinged, 14 Padlocks Model: 503YLW
Grainger
$123.66
Master Lock Group Lockout Box: Steel, Yellow, 12.75 in X 6.38 in 3.5 In, Wall, Hinged, 14 Padlocks Model: 503YLW
Grainger
$301.88
Master Lock Lock Box: Mechanical Combo Lock, 6 Key Capacity, 5 in Outside Ht, 2 7/8 in Outside Wd Model: 5425D
Grainger
$301.88
Master Lock Lock Box: Mechanical Combo Lock, 6 Key Capacity, 5 in Outside Ht, 2 7/8 in Outside Wd Model: 5425D
Grainger
$65.53
Master Lock No. 5401D 4-Digit Locking Combination Wall Mount Keylock Box - Holds 1-5 Keys
Global Industrial
$65.53
Master Lock No. 5401D 4-Digit Locking Combination Wall Mount Keylock Box - Holds 1-5 Keys
Global Industrial
$124.00
Master Lock S3650 Group Lock Box, Wall Mounted, Red
Global Industrial
$124.00
Master Lock S3650 Group Lock Box, Wall Mounted, Red
Global Industrial
$87.43
Master Lock Wall Mount Lock Box, 3"W X 2-3/16"D X 5-3/8"H, Black, 5481D
Global Industrial
$87.43
Master Lock Wall Mount Lock Box, 3"W X 2-3/16"D X 5-3/8"H, Black, 5481D
Global Industrial
$49.99
Master Lock 3.13 in. W Metal 4-Digit Combination Lock Box
Ace Hardware
922
$49.99
Master Lock 3.13 in. W Metal 4-Digit Combination Lock Box
Ace Hardware
$109.95
Master Lock Latch Tight Group Lock Box, Portable, Red, 498A
Global Industrial
$109.95
Master Lock Latch Tight Group Lock Box, Portable, Red, 498A
Global Industrial
$58.95
Master Lock Compact Group Lock Box, Portable Or Wall Mounted, Thermoplastic, S3570
Global Industrial
$58.95
Master Lock Compact Group Lock Box, Portable Or Wall Mounted, Thermoplastic, S3570
Global Industrial
$49.99
Master Lock 4-5/8 in. H X 3.13 in. W X 2-1/16 in. L Metal 4-Digit Combination Lock Box
Ace Hardware
346
$49.99
Master Lock 4-5/8 in. H X 3.13 in. W X 2-1/16 in. L Metal 4-Digit Combination Lock Box
Ace Hardware