Sargent & Greenleaf 6530-003 UL Group 2 Vault Lock, Square, Center Extension, Reversible, Direct

Group 2 is the UL classification for a mechanical combination lock built to resist manipulation for a limited period, and it is the rating most commonly specified for commercial safes and vault doors. The 6530-003 is a UL Group 2 mechanical dial lock with four combination wheels, so it is a manipulation-resistant mechanical lock rather than an electronic or a higher Group 1 unit.

Either. The 6530-003 is a reversible lock, so the same body covers left and right hand mounting positions on the door. That matters if you are stocking one lock for a mixed fleet of vault doors instead of ordering handed units.

It's a direct entry lock, meaning the dial drives the lock mechanism directly with no key or secondary release step. The spindle is a square, center extension type, so it is set up for a center-mounted dial position and the spindle is extended to reach through the vault door thickness.

Four brass and aluminum wheels give 100,000,000 theoretical combinations on the 6530-003. In practice you set a three or four number combination on the dial; the wheel count is what determines how many distinct settings the pack can hold, and it is what a bank or institutional security spec is usually asking about when it calls for a four wheel pack.

The 6530-003 is the lock body and spindle assembly, ordered as a vault lock unit. Dial and ring selection is made separately on S&G mechanical locks because the ring style and spindle length have to match the door thickness and the finish of the existing hardware. If you are replacing a lock only and keeping the original dial, confirm the spindle is the square center extension type before you pull the old body.

Not as a straight swap in the same footprint without checking the prep. The 6530-003 is a mechanical dial lock with a square center extension spindle, so the door is bored and mounted for a dial and spindle, not for a keypad cable pass-through. Facilities that want audit trail or multiple user codes do change over, but that is a conversion with new mounting and a different entry unit, not a drop-in body change.