About Padlocks
More
Weather- and Cut-Resistant Padlocks

The partially concealed shackle on these padlocks means more security for your outdoor equipment and gates than a traditional padlock. Since most of the shackle is covered, it's difficult to access and cut. For durability outdoors, they’re made from materials that resist corrosion from rain and snow.
These padlocks have a pin-tumbler key locking mechanism, which is the most difficult locking mechanism to pick. The more pins the lock has, the harder it is to force open. Choose these padlocks if you need locks that each open with a different key. All have random key numbers.
Style C padlocks have a dual-locking shackle, so they prevent attempts to force them open from prying, shimming, or tapping because both ends of the shackle lock inside the body.
Steel-body locks are stronger and hold up better against break-in attempts than brass-body locks. They are also covered in plastic to prevent them from scuffing or denting nearby surfaces.
Hardened boron alloy shackles are the hardest and most cut-resistant shackle material. They also hold up against corrosion better than hardened steel shackles.
Padlocks with a keyhole cover keep out water and debris to protect the cylinder from freezing, corroding, and jamming.
For technical drawings and 3-D models, click on a part number.


Shackle | Cover | Each | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Style | Vertical Clearance | Horizontal Clearance | Dia. | Material | Ht. | Wd. | Thick. | Manufacturer and Model No. | Color | Material | No. of Keys Included | Keyhole Cover Material | No. of Tumbler Pins | 1-5 | 6-Up | |
Laminated Steel Body | ||||||||||||||||
C | 3/4" | 7/8" | 5/16" | Hardened Boron Alloy | 2 5/16" | 2 1/8" | 1 1/2" | Master Lock Pro 6321 | Black | Plastic | 2 | Plastic | 5 | 00000000 | 000000 | 000000 |
Weather- and Cut-Resistant Keyed Alike Padlocks

Lock gates and outdoor equipment without worrying about the shackle being cut. These padlocks have raised shoulders that cover most of the shackle, making it difficult to access. Made from materials that resist corrosion from rain and snow, they’ll operate smoothly even when exposed to the elements. Choose them if you need several locks that open with the same key. If the lock or key with the key number you want isn’t listed, order the "Other Key Numbers" and specify your desired key number.
All have a pin-tumbler key locking mechanism, which is harder to pick than padlocks with a disc-tumbler key locking mechanism. The more pins a lock has, the harder it is to pick.
For technical drawings and 3-D models, click on a part number.


Steel-body padlocks are strong, and they’re less likely to deform from break-in attempts than brass-body padlocks. They have a plastic cover to protect the padlock body from weather and impact.
Padlocks with a dual-locking shackle prevent attempts to force them open from prying or shimming because both ends of the shackle lock inside the padlock body.
Boron alloy shackles are the hardest and most cut-resistant shackle material. They also resist corrosion better than hardened steel shackles.
Padlocks | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Shackle | Body | Cover | Each | Additional Keys | |||||||||||||
Style | Vertical Clearance | Horizontal Clearance | Dia. | Material | Ht. | Wd. | Thick. | Color | Material | No. of Keys Included | No. of Tumbler Pins | Key No. | 1-5 | 6-Up | Each | ||
Dual Locking and Protected Shackle Style | |||||||||||||||||
Master Lock Pro 6321 | |||||||||||||||||
D | 3/4" | 7/8" | 5/16" | Boron Alloy | 2 5/16" | 2 1/8" | 1 1/2" | Black | Plastic | 2 | 5 | 12G034 | 00000000 | 000000 | 000000 | 000000000 | 00000 |
D | 3/4" | 7/8" | 5/16" | Boron Alloy | 2 5/16" | 2 1/8" | 1 1/2" | Black | Plastic | 2 | 5 | 12G103 | 00000000 | 00000 | 00000 | 00000000 | 0000 |
D | 3/4" | 7/8" | 5/16" | Boron Alloy | 2 5/16" | 2 1/8" | 1 1/2" | Black | Plastic | 2 | 5 | 13G809 | 00000000 | 00000 | 00000 | 000000000 | 00000 |
D | 3/4" | 7/8" | 5/16" | Boron Alloy | 2 5/16" | 2 1/8" | 1 1/2" | Black | Plastic | 2 | 5 | 14G004 | 00000000 | 00000 | 00000 | 000000000 | 0000 |
D | 3/4" | 7/8" | 5/16" | Boron Alloy | 2 5/16" | 2 1/8" | 1 1/2" | Black | Plastic | 2 | 5 | Other Key Numbers | 000000000 | 00000 | 00000 | 000000000 | 0000 |
Weather- and Cut-Resistant Master Keyed Padlocks


Shackle is concealed to make it difficult to cut. Choose these locks if you want individual locks or groups of locks that open with their own key, but also open with a master key. The included keys have random key numbers; master keys are sold separately.
Steel-body locks have a plastic cover to provide corrosion resistance.
Pin-tumbler key locking mechanisms are the most difficult locking mechanisms to pick. When choosing between padlocks with four or five pins, the lock with five pins is harder to pick.
For technical drawings and 3-D models, click on a part number.
Padlocks | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Shackle | Body | Cover | Master Keys | ||||||||||||||
Vertical Clearance | Horizontal Clearance | Dia. | Material | Ht. | Wd. | Thick. | Manufacturer and Model No. | Color | Material | No. of Keys Included | No. of Tumbler Pins | Master Key No. | Each | Each | |||
Laminated Steel Body | |||||||||||||||||
B | 3/4" | 7/8" | 5/16" | Hardened Steel | 2 5/16" | 2 1/8" | 1 1/2" | Master Lock Pro 6321 | Black | Plastic | 2 | 5 | SG414 | 00000000 | 000000 | 00000000 | 00000 |