I recently picked up a rotary hammer at an estate sale that came with a large number of bits. A few however don't fit the hammer, and look like they would be used in a pneumatic hammer drill.

Anyone know the age on these Dayton percussion bits? I can't find much about them online,and they don't look like ordinary pneumatic hammer drill bits.

Anyone still make hex drive hammer drills?

I've used about every rotary hammer there is, but hex drive is new to me. The old Ram-Set's had a tri-angle drive-that's about as close as I know. The Dayton and more recently Dayton/Superior company makes concrete related products; maybe at one time they sold tools, but now, not so much.

Unusual right?

Dayton Electric Mfg Company was around from 1930's to 1960's when they were bought out by Grainger I guess.

check B & A MANUFFACTTURIING COMPANY catalog, has several adapters for hex drive to SDS or other drives..

Looks like an old (UK) Kango bit - they used hex drive on some of their rotary hammers. I believe they were taken over by Milwaukee...

see: http://www.ebay.co.uk/itm/Kango-Chuck-Adapter-to-Attach-Rotary-Chuck-For-Drilling-/370774466667

Hex is Skill RotoHammer from the 60s.  Good quality carbide and steel.

The RotoHammer was a HEAVY brute, and was one of the first electric hammers worth having.  It was nicer if you had a 2 wheel cart to move the damn thing and steel suitcase it came in, and a 10 foot pipe to screw into the auxiliary handle.  If that drill caught a rebar, you could count on pain before it shut down, even if you were smart enough to have a foot switch.

RotoHammer came in 2 or 3 sizes and would chuck up to a 2" twist bit or 3" Tilden bit.  I have a 2" tilden that has and will drill through 4 feet of concrete all day long for one of the big RotoHammers.

Skil also made a similar looking hammer called DemoHammer that was built to drive chisels with no rotation.

The Dayton bit is a W W Grainger tool, possibly from the 70s.
In that timeframe all manufacturers had a mentality that you would buy bits only from them for their tool and charged till you bled.  None would license any bit manufacturer to sell bits that fit their tool, and they all employed Lawyers to make sure.

A couple bit manufacturers, Grainger being one, discovered the glitch and started selling adapters that went from manufacturer drive to A taper, and put a hurt on manufacturers.

Patents ran out around 1980 and bit manufacturers offered bits for Skil, Bosch, Hilti and others.