Sargent & Greenleaf Safe Dial, Standard Front Reading, Black and White, 3.294" (83.7mm

The D Series dial comes with a single spline 5/16 inch - 40 spindle already pressed in. That thread pitch is what mates the dial to the lock spindle hub, so the lock you are putting it on has to accept a 5/16-40 spindle. The spline keyway is aligned to either 41 or 50 on the dial from the factory.

Yes, the D Series standard front reading dial can be used with any Group 2 or Group 2M type lock. It is the dial and ring set specified for 6600 and 6700 Series locks. If your lock is an electronic or Group 1 unit, this is not the dial for it.

Maximum door thickness is 3.4 inches. That is the limit set by the spindle length pressed into the dial, so measure from the face of the door to the lock body before ordering. Anything thicker than 3.4 inches needs a longer spindle than this assembly carries.

Ring diameter is 3.294 inches (83.7 mm). That is the dimension to check against the escutcheon or dial ring footprint already on your safe door, since it decides whether the new dial covers the existing mounting circle and screw pattern.

Front reading means the combination numbers are read at the top front face of the dial, so the operator stands square to the door and reads the index straight on. That is the standard arrangement on most upright safes and vault doors. The alternative, top reading, puts the index on the upper edge of the dial and suits installations where the dial sits low and is read from above. Match whichever your existing dial ring is marked for, because the ring and dial work as a pair.

The black and white D Series dial is supplied as a dial and ring for 6600/6700 Series locks, with the 5/16-40 spindle already pressed into the dial. So the spindle is not a separate purchase. What you will still need from the safe side is the lock body itself and the mounting screws that came with your door prep.

The spline on a 5/16-40 spindle only seats one way in the lock hub, so the factory presses the spindle into the dial with the keyway indexed to either 41 or 50. That alignment is what makes the numbers you dial match the numbers the wheel pack actually sees. If you press a spindle in yourself at a random position, the combination reads off by however many numbers you were out, which is the usual reason a replacement dial will not open a lock on a known combination.

Fit is governed by the spindle, not the brand plate. This dial carries a single spline 5/16 inch - 40 spindle and is specified for Group 2 and Group 2M locks in the 6600/6700 Series. A lock whose hub takes a 5/16-40 single spline spindle and whose dial ring matches a 3.294 inch ring diameter is the case where it drops in. Outside that, it is the wrong dial.

Anywhere the safes run Group 2 or Group 2M locks in the 6600/6700 family with doors no thicker than 3.4 inches, the same standard front reading black and white dial covers them all, which keeps one spare on the shelf instead of several. The two things that break the standardization are a door over 3.4 inches thick and a dial ring cut for top reading rather than front reading.