Quote from: mikeswrenches on January 27, 2017, 11:12:09 AM
How about a picture or two of the Tobrin no. 30 and 31. I'm not familiar with them.

Mike

They are extremely similar, but the the major difference is the HD Smith circle (trademark) with the size number inside it on the screwdriver tip was replaced with the Tobrin triangle (trademark) with the size inside it.

About size markings, at least for fasteners and wrenches, read this- 5 - Size

QuoteStandard Markings
Note: In the United States prior to 1929 the sizes stamped on wrenches usually referred to the diameter of the bolt not the actual opening size. Thus a wrench stamped ½ U. S. would actually have a 7/8" wrench opening size as a nut for a ½" diameter U. S. Standard bolt would measure 13/16" across the flats and allowing for 1/16 clearance would require a 7/8" wrench opening. This same size wrench would also fit nuts for 5/8" hex cap screw and bolt and nuts for 9/16" S.A.E Standard Cap Screws and thus would be marked ½ U.S, 5/8 Hex Cap, and 9/16 SAE. Carl Bolt's website page on tool standards pictures 17 wrenches with 19 different identifications and sizes all marked 1/2"! This could get pretty confusing so circa 1929 the American Engineering Standards Committee specified that wrenches should be marked with the actual width across the flats of the nut or bolt head they would fit.

From http://www.wrenchingnews.com/wrench-logos/logos-page-1.html

Quote from: Papaw on March 16, 2017, 04:45:18 PM
About size markings, at least for fasteners and wrenches, read this- 5 - Size

QuoteStandard Markings
Note: In the United States prior to 1929 the sizes stamped on wrenches usually referred to the diameter of the bolt not the actual opening size. Thus a wrench stamped ½ U. S. would actually have a 7/8" wrench opening size as a nut for a ½" diameter U. S. Standard bolt would measure 13/16" across the flats and allowing for 1/16 clearance would require a 7/8" wrench opening. This same size wrench would also fit nuts for 5/8" hex cap screw and bolt and nuts for 9/16" S.A.E Standard Cap Screws and thus would be marked ½ U.S, 5/8 Hex Cap, and 9/16 SAE. Carl Bolt's website page on tool standards pictures 17 wrenches with 19 different identifications and sizes all marked 1/2"! This could get pretty confusing so circa 1929 the American Engineering Standards Committee specified that wrenches should be marked with the actual width across the flats of the nut or bolt head they would fit.

From http://www.wrenchingnews.com/wrench-logos/logos-page-1.html

Thanks for the info! Perfect !

You will find yourself visiting The Wrenching News often. The owner, Bus Haury is a Tool Talk member also.

And- If wrenches are in your range of research, check out Alloy Artifacts- http://alloy-artifacts.org/

Quote from: Yodaslo on March 16, 2017, 03:07:54 PM
... (HD Smith was partnered for a time with Clark Brothers Bolt Co if I remember correctly)...

The Clark Brothers Bolt factory was about 3/4 of a mile from the HD Smith factory.
Same town, Southington CT, different villages, Milldale (Clark Bros.) and Plantsville (HD Smith)

Answer to the original question - 2, 2 1/2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12. I bought a #5 in a box of old tools at an estate auction. BTW I am new here. Hoping to resurrect this thread. See attached

I have some of  the sizes.

Bob, the 660 series were never catalogued, that we know of, which is what makes the sizes so hard to determine. It's possible they followed the same sizes as the regular ones...or not, hard to tell without catalog information or someone's really large collection.

They seem to be less common than the regular PH ones. For those who are interested, I below listed the 660 patent, and the regular SD patent second.

No. 1,677,572 on July 17, 1928 by L.V. Walkley
No. 1,170,709 on February 8, 1916 by W.S. Thomson

Mike