- Joined
- Oct 31, 2015
- Messages
- 469
When Jacobs came out with the ball bearing chuck, it was labeled "14". The sleeve has a straight OD. When they went to the "tapered" OD, they started stamping "14N" on the chuck. I don't know enough history to tell you the time frame this happen in. I remember seeing ads in the late 1960's advertizing the "Super Chuck", this is where I've seen the OD change from straight to tapered. I own a older "20" ball bearing chuck. The 20N jaw sets fit perfectly. Having said this, I assume this applies to all sizes of ball bearing chucks, from the older one to next generation of chucks marked with "N". This doesn't apply to the newer one's made in China.
My Jacobs 20 chuck was a deal at under $50. It has never been used. Looked like it sat on a shelf for 70 years! Nice patina to it. It had a 1-1/2 straight on it when I bought it.It does say Super Chuck on the bottom so this very well may be an early version. If it is, and its tight, then $16.00 is an awesome deal!
I own many Jacobs Super Chucks and have seen a lot more. But have never seen one look like that? Never knew they had an early version Super Chuck? Thank you for sharing!...DaveMy Jacobs 20 chuck was a deal at under $50. It has never been used. Looked like it sat on a shelf for 70 years! Nice patina to it. It had a 1-1/2 straight on it when I bought it.