Which is better for outdoor use?

Both are weather resistant. The Brinks relies on its stainless steel body, while the Master Lock adds a plastic Weather Tough cover over a steel body. For salt air or constant wet, the Brinks stainless body has fewer rust points.

Is the Master Lock worth the extra money?

If you need rekeying, keyed-alike ordering or a pick-resistant 5-pin cylinder, yes. For a shed or gate where price matters, the Brinks at $13.44 does the job for less.

Which has the stronger shackle?

The Brinks shackle is thicker at 5/8 in versus 5/16 in on the Master Lock. The Master Lock uses hardened boron alloy, which resists cutting better per unit of thickness. The Brinks wins on raw size.

Can either lock be rekeyed?

Only the Master Lock 6121 is advertised as rekeyable, and keyed-alike versions are sold. The Brinks uses a 4-pin brass tumbler and is not sold as rekeyable.

The Brinks stainless body resists corrosion longer in wet conditions. The Master Lock's cover protects the body, but the laminated steel underneath can rust if the cover tears.

Which is harder to pick?

The Master Lock. Its 5-pin cylinder with spool pins is designed to defeat picking. The Brinks 4-pin brass tumbler is simpler.

Master Lock 6121 Stainless Steel Padlock vs Brinks Stainless Steel 60mm Keyed Discus Padlock with 5/8in Shackle

Buy the Brinks discus if you want a low-cost weather-resistant lock for a shed, gate or storage unit; at $13.44 at Walmart as of November 5, 2026 it costs about $11.55 less than the Master Lock. Buy the Master Lock 6121 if you need a rekeyable commercial-grade lock with a boron alloy shackle and a covered body; it is $24.99 at Amazon as of November 5, 2026. The Brinks has the wider 5/8 in shackle, but the Master Lock has the tougher shackle steel and the pick-resistant 5-pin cylinder.

Today the Brinks Stainless Steel 60mm Keyed Discus Padlock with 5/8in Shackle costs $11.55 less at its best price.

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