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Silver stainless steel disc padlock with partially hidden steel shackle

Master Lock

Master Lock 2-3/4-Inch Keyed-Alike Shielded Lock 40KAD-0501 Key Control

SKU CH-17DA-PF7HG

Partially hidden shackle padlock with stainless steel body, keyed alike to open with key number 501

  • MaterialHAWA
  • Keyed-alike convenience opens multiple locks with one 501 key
  • Partially hidden shackle resists bolt-cutters and prying tools
  • Stainless-steel body withstands rain and corrosion outdoors
  • Four-pin cylinder deters picking without high-security complexity
  • Compact 2-3/4-inch disc shape fits tight hasps and chains

Shielded disc padlock for keyed-alike access

The Master Lock 40KAD-0501 is a 2-3/4-inch stainless steel disc padlock with a partially hidden steel shackle. It uses a 4-pin Master K1 keyway and opens with key number 501. Keyed-alike configuration means multiple locks share the same key for simplified access control.

Suited for weather-exposed gates and storage units

Weather-resistant construction makes it appropriate for outdoor gates, sheds and utility enclosures where corrosion resistance matters. The fixed keyway and non-rekeyable design mean it does not suit facilities that require master-key systems, interchangeable cores or the ability to change cylinders without replacing the lock.

Sustained outdoor exposure without performance loss

Stainless steel body and steel shackle resist rust during continuous rain, humidity and temperature cycling. The shielded shackle geometry limits bolt-cutter leverage during prolonged attack attempts. Four-pin tumbler mechanism maintains consistent operation after thousands of cycles without lubrication intervals specified by the manufacturer.

Highlights

  • Keyed-alike convenience opens multiple locks with one 501 key
  • Partially hidden shackle resists bolt-cutters and prying tools
  • Stainless-steel body withstands rain and corrosion outdoors
  • Four-pin cylinder deters picking without high-security complexity
  • Compact 2-3/4-inch disc shape fits tight hasps and chains

Specifications

MaterialHAWA
BrandMASTER LOCK CO

Questions about this item

What key number must I already have for this 40KAD-0501 padlock to open it?

The lock opens with Key No. 501, so you need an existing Master Lock Key No. 501 for it to work.

Will this disc-shaped stainless-steel padlock fit the same 3/8-inch shackle holes as my older Master Lock models?

Yes, the shackle diameter is 3/8 in, matching the hole size on many older Master Lock padlocks.

How can I confirm the shielded shackle is engaged after I snap the lock shut?

The partially hidden shackle design covers most of the shackle; when locked, only a small portion remains visible, confirming it is fully engaged.

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