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Black rectangular steel padlock with laminated finish and 2-1/2 inch boron shackle

Master Lock

Master Lock Pro Series Weather Tough Interchangeable Core 2-1/2 in Black

SKU CH-3RE9-7K0NF

Weather-resistant padlock with interchangeable SFIC core and hardened boron shackle

  • Product typePro Series Weather Tough
  • Weather-resistant laminated steel body protects against corrosion
  • Interchangeable SFIC core allows quick rekeying without replacing the lock
  • 5/16 in boron shackle resists cutting and saw attacks
  • Six-pin cylinder provides pick-resistant security
  • 2-1/2 in shackle clearance fits thick hasps and chains

Pro Series Weather Tough Padlock

The Master Lock Pro Series Weather Tough padlock uses a 6-pin interchangeable core that accepts any OEM SFIC keyway, letting facility managers standardise keys across multiple doors. Its laminated steel body and boron shackle resist cutting and prying, while the black finish adds corrosion protection for outdoor gates, storage units or construction-site hasps.

Interchangeable Core Build Fit

The rectangular body measures 2 13/32 in high by 2 1/8 in wide by 1 5/16 in thick, so it sits flush against flat mounting plates without extra spacers. A 5/16 in diameter boron shackle with 2 1/2 in vertical clearance and 7/8 in horizontal clearance slides through standard hasp eyes and chain links, freeing the installer from sourcing special hardware.

Sustained Outdoor Exposure

Laminated steel layers and a weather-resistant seal keep moisture and grit from binding the cylinder during long-term exposure to rain, humidity or dust. The boron shackle maintains its hardness after repeated freeze-thaw cycles, so the lock continues to turn smoothly without the stiffness that develops on unprotected padlocks left in the elements.

How it compares

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

Price $25.99
Cheaper than about 65% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMaster Lock
Product typePro Series Weather Tough

Questions about this item

Will the 6-pin cylinder resist picking and bumping during extended outdoor use?

The lock uses a 6-pin interchangeable core that accepts any OEM SFIC cylinder, allowing you to install a high-security core if bump resistance is required.

Does the laminated steel body and boron shackle stay operable after months of rain and temperature swings?

The Weather Tough construction combines a laminated steel body with a boron shackle and black finish to resist corrosion and freezing in daily outdoor exposure.

What type of core and keyway must I already have to operate this padlock?

It ships with an SFIC-compatible interchangeable core, so you need an existing OEM SFIC key system or a new SFIC core to match your current keys.

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