Reamer size and number question

[Suzuki4evr]

Hi guys
I have a question about 2 reamers I got in a batch of tools I bought, but I haven't worked alot with reamers before. I am familiar with H7 reamers,but these I need help with.



Can someone explain what the 11/11 and 22/11 means?

The reamer also tapers off quite a bit to the front. Another thing is that there is a 25 stamped on the reamer,wich usually means the size wich in this case would be 25mm. But thing is it doesn't measure 25mm. I don't have them with me right now,but I think it measured about 23mm at the biggest point,but I am not sure,can check tomorrow.

Can someone shine some light on this for me please.
Thanks guys

Michael

 

[benmychree]

Kinda look like structural reamers for lining up holes for structural bolts or rivets when the holes don't quite match alignment

 

[pontiac428]

Just a SWAG, but could it be 11 degrees taper over 11 centimeters? 11 deg is a number I've seen in a few different taper specs.

 

[Suzuki4evr]

Just a SWAG, but could it be 11 degrees taper over 11 centimeters? 11 deg is a number I've seen in a few different taper specs.

I will check that and see if the other one is over 20degr. Don't know if it is what it stands for,but will not hurt to check.

 

[Toolmaker51]

They could be 'bridge reamers' aka structural usage. Their actual profile appears/ is curved along the centerline.
However, the designation of these hints at taper pin reamers which are made imperial and metric, naturally are straight taper.

 

[pstemari]

Those aren't taper pin reamers. I'll second the suggestion that they are bridge reamers, like these:

https://www.mscdirect.com/browse/tn/?typahddsp=Bridge%2FConstruction+Reamers&navid=12106086