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Black laminated steel padlock with boron shackle and five-pin cylinder

Master Lock

Master Lock BumpStop Padlock 5 Pin Boron Alloy 1-1/8 In H

SKU CH-5AFQ-V01X6

A 5-pin laminated steel padlock with a boron-alloy shackle and BumpStop cylinder for pick resistance

  • Product typeBumpStop
  • BumpStop cylinder resists lock-bumping attacks
  • 5-pin Master K6000 keyway provides high-security key control
  • Boron-alloy shackle resists cutting and sawing
  • Laminated steel body with black finish withstands weather
  • Rekeyable design allows cylinder changes when needed

BumpStop padlock with boron-alloy shackle

The Master Lock BumpStop padlock uses a boron-alloy shackle and a 5-pin cylinder to resist physical attack and lock bumping. Its laminated steel body and weather-resistant finish suit outdoor gates, sheds and storage units. The rectangular body measures 2 13/16 in tall by 2 1/8 in wide with a 1 in thickness. A standard shackle provides 1 1/8 in vertical clearance and 7/8 in horizontal clearance.

Rekeyable Master K6000 keyway for existing systems

The cylinder uses the Master K6000 keyway and is rekeyable, so the lock can be matched to other hardware on the same key. Different keys are supplied out of the box, and no control-key registration is required. This makes the padlock a direct replacement for keyed-alike installations that use the same keyway. The jump is worth it when you need bump resistance without changing your current key system.

Verify shackle dimensions and keyway compatibility

Confirm that the 5/16 in shackle diameter and 1 1/8 in shackle height fit the hasp, chain link or staple you intend to secure. Ensure the existing cylinders you want to match use the Master K6000 keyway so rekeying is possible. The lock is not interchangeable-core and ships with zero bumpers on the shackle.

How it compares

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

Price $23.99
Cheaper than about 67% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMaster Lock
Product typeBumpStop

Questions about this item

Will the 5/16 in shackle diameter fit my hasp or chain link?

The shackle is 5/16 in thick, 1 1/8 in tall and 7/8 in wide, so measure the opening of your hasp or chain to confirm it clears those dimensions.

How do I fit the lock onto a hasp and what is the common mistake?

Open the shackle with the key, pass it through the hasp, then push the shackle fully home until it clicks; the frequent error is leaving the shackle partially engaged so the lock appears closed but is not secured.

Can the cylinder be re‑keyed later and what keyway does it use?

Yes, the lock is rekeyable and uses the Master K6000 keyway, so a locksmith can change the pinning to match other K6000 keys.

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