GE Material Specification 3

[Airmack]

Recently, I have run into a GE print (ca 1962) of a part that we need to have made. It lists several options for material, but under a General Electric material specification (B5F15B and B5F7H2 to be exact). Has anyone had any experience with this specification? It seems like an internal spec, but I have been unable to define the material apart from simple spark/hardness/magnetic tests on the OEM part.

 

[metengr]

Airmack;
What is the part?

 

[Airmack]

It is a large, ~3" nut that holds a rotor on a shaft of an aircraft generator. It is magnetic, HRc = 28, and has a spark consistent with a low carbon steel. I would assume it's a simple 1000 series steel alloy, but since it is going on an aircraft I do not want to assume anything .

We do have options to do a full series of tests to determine the exact composition, but if somebody has some experience with old GE material specs; that's preferable.

 

[rmw]

B5F15B is tubing, seamless, Cr-Mo steel, AISI 4130, normalized or stress relieved.

B5F7H2 is Bars, aircraft quality Cr-Mo Steel, AISI E4140 or E4142, cold finished, heat treated.

My book is dated 1970. Does anyone know if GE still uses those material designations?

This post made me do some digging way in the back of the desk drawer.

rmw

 

[Airmack]

rmw,

That's perfect. Do you mind if I ask the reference?

Thanks for digging in the back of the drawer!

 

[rmw]

It is a book, a large pamphlet type, a little over 200 pages published by GE called General Electric material, Part & Finish Designations (Empis). We were issued them as field engineers because we had to be able to convert the GE designations to real world materials when we had to obtain parts and materials in the field at sites and on jobs.

It reads a lot like a military specification.

I guess it was GE's version of the Enigma code that the Nazis used to confuse their enemies.

rmw

 

[gearHTr]

I could not find either of those material specifications on GE's current specification index( Oct. '07). They must have been cancelled or superceded at some point, but there is no reference to them at all.

Mike

 

[CLD]

I am also trying to decode GE EMPIS specifications.

Can anyone locate an old EMPIS book to decode the following specs:

B11H97H

B11B3E

Can you help us AIRMACK?

 

[Airmack]

rmw happened to have the old spec. I did not see this spec, though. Maybe rmw can step in again? That seems to be a valuable book lately.

 

[CLD]

Dear Airack & rmw:

We got the detailed specs finally from customer. So we did not need the EMPIS book afterall.

Thanking you anyway for your assitance,

CLD

 

[rmw]

Sorry,

I clicked into this thread too late. I will glad to help if needed.

rmw

 

[loclot]

RMW - Need to see if you can break out the GE EMPIS book again?

Need to find out what GE designation B4C1C3 is?

Any help would be appreciated!