The difference between S&G 8500 series and 2937 series.

[98G]

In the past couple of weeks I've installed an 8560, an 8550 and a 2937.

The 8550 and the 2937 seem identical except for a trivial difference in the dials.

I didn't have them side by side to compare. What'd I miss?

[Raymond]

The 2937 has several security improvements. It is a physically stronger lock.

The dial cover is attached with two small screws instead of snapping on like the 8500s.

The spindle has a circle cut around it where the cut will be just below the container surface if broken. Below the ring cut are two hardened pins through the spindle to prevent drilling. (Warning: bumping the dial and then straightening it can much more easily cause the spindle to break. I have opened three containers in this condition without drilling.)

The lock bolt is made of stainless steel and is pretapped with two 10-32 holes.

The lever is stainless steel.

There is a stainless blocking part to prevent punching the bolt into the lock body.

The dialing accuracy has been improved to less than 1/2 number variance in either direction

Unless you must meet the GSA regulations, the 8500 series dial can be used in place of the weakened 2937 spindle.

It is a good lock. This is all I can remember at the moment.

[98G]

The 2937 has several security improvements. It is a physically stronger lock.

The dial cover is attached with two small screws instead of snapping on like the 8500s.

The spindle has a circle cut around it where the cut will be just below the container surface if broken. Below the ring cut are two hardened pins through the spindle to prevent drilling. (Warning: bumping the dial and then straightening it can much more easily cause the spindle to break. I have opened three containers in this condition without drilling.)

The lock bolt is made of stainless steel and is pretapped with two 10-32 holes.

The lever is stainless steel.

There is a stainless blocking part to prevent punching the bolt into the lock body.

The dialing accuracy has been improved to less than 1/2 number variance in either direction

Unless you must meet the GSA regulations, the 8500 series dial can be used in place of the weakened 2937 spindle.

It is a good lock. This is all I can remember at the moment.

Thanks! I haven't seen a 2937 with a delrin wheel pack. Do they make it as a 1R?

[FranklyFlawless]

No, the Sargent and Greenleaf 2937 is only available as a Group 1 lock:

Model 2937 High Security Combination Lock | Sargent and Greenleaf

[Raymond]

Thanks for the picture. To correct myself the lever is brass.