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Black steel rectangular padlock with silver long shackle

Master Lock

Master Lock Padlock KA 2-1/2 In H 4 Pin Steel

SKU CH-P2GJ-EN0WR

Steel padlock with 4-pin cylinder, BumpStop protection and 2-1/2 inch boron shackle keyed alike to A152

  • Product typeCommerical with BumpStop
  • BumpStop cylinder resists bumping attacks with 4 pin design
  • Keyed alike A152 opens multiple locks using one single key
  • Hardened boron shackle 15 16 in diameter resists cutting attempts
  • Steel body black silver finish provides durable corrosion resistant protection
  • Long shackle 2 1 2 in height fits oversized hasps chains

Steel padlock with BumpStop

The Master Lock padlock uses a steel body and boron shackle to resist cutting and prying. Its four-pin cylinder includes BumpStop technology that blocks bump-key attacks. The lock is keyed alike to number A152 so multiple units open with the same key.

Keyed-alike convenience

All locks in the set share key number A152, removing the need to carry separate keys for each padlock. Control-key registration is required, limiting duplication to authorised personnel. The rectangular body and long shackle fit standard hasps and chains without modification.

Four-pin security limits

The four-pin cylinder provides basic pick resistance for low-risk indoor or sheltered outdoor use. It lacks a high-security rating and is not weather resistant, so prolonged exposure to rain or salt air will degrade the mechanism. Buyers needing certified high-security or marine-grade protection should select a different lock.

How it compares

Measured against everything we stock in Door Lock Sets & Deadbolts, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 72% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMaster Lock
Product typeCommerical with BumpStop

Questions about this item

Will the 4-pin cylinder or boron shackle need replacement first under heavy use?

The 4-pin cylinder is the wear item; boron shackles resist cutting so the lock mechanism typically requires service before the shackle fails.

What stops a Master Lock No. A152 keyed-alike padlock from being opened after thousands of cycles?

Internal pin springs and driver pins fatigue first, causing the cylinder to bind or turn roughly before the steel body or boron shackle shows wear.

Does the steel body or the BumpStop feature generate noticeable heat when the padlock sits in direct sun all day?

The solid steel body absorbs solar heat and becomes hot to the touch, while the BumpStop components remain at ambient temperature.

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