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Black rectangular laminated steel padlock with standard shackle

Master Lock

Master Lock 6121KA-10G100 padlock keyed alike 10G100 rectangular

SKU CH-T3Q8-ADGVF

Rectangular laminated steel padlock with 5-pin cylinder keyed alike to 10G100 for convenient single-key access

  • Product typeMechanical Push Button
  • Keyed alike for single-key convenience across multiple locks
  • Five-pin cylinder with Master K6000 keyway resists picking
  • Boron-alloy shackle and laminated steel body withstand cutting and prying
  • Weather-resistant finish protects mechanism in outdoor conditions
  • Rekeyable design allows cylinder changes without replacing the lock

Master Lock 6121KA-10G100 padlock

This rectangular padlock uses a 5-pin mechanical cylinder opened by key number 10G100. The keyed-alike configuration means every lock in the set shares the same key for simplified access control. It suits facilities managers and property owners who need multiple entry points secured with a single credential.

Hardened boron-alloy shackle resists cutting

The 5/16-inch diameter shackle is made from boron alloy for high cut resistance. A laminated steel body with black finish adds physical strength and weather resistance for outdoor exposure. No electronic components are present so power draw and noise are not applicable.

Two keys included per lock

Each unit ships with two matching keys cut to the 10G100 code. The cylinder is rekeyable by a locksmith if the key code must change later. No control key registration is required and the core is not interchangeable. Buyers who need master-keyed systems or electronic audit trails should consider alternative product lines.

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 typeMechanical Push Button

Questions about this item

How do I install the Master Lock 6121KA-10G100 padlock on a gate or hasp, and what is the common mistake?

Insert the 5/16 in boron alloy shackle through the hasp or chain link, then press the lock body down until the shackle clicks into the 5-pin cylinder; the step people miss is verifying the shackle fully seats before turning the key, otherwise the lock appears closed but is not engaged.

What maintenance or replacement will the Master Lock 6121KA-10G100 need over time?

Lubricate the 5-pin cylinder and shackle bore periodically with a dry PTFE spray to prevent grit buildup; the laminated steel body and boron alloy shackle resist cutting, but if the keyway wears or a key is lost, the lock is rekeyable to a new Master K6000 keyway without replacing the whole unit.

What limit appears first when the Master Lock 6121KA-10G100 sees sustained outdoor use?

The laminated steel body with black finish is weather resistant, yet prolonged exposure to salt or acidic moisture can eventually corrode the shackle-to-body interface, making the shackle stiff before the 5-pin mechanism fails.

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