Some Thoughts on the Obi ANH Transistor Washers

[andyroo]

There's some washers on eBay that look interesting. Too expensive of a gamble for me though due to the shipping costs. Obviously not the right match as they're black but still...

They're called ARP special washers. Seems like they're automotive parts

 

[NathanM]

These right here?

 

[chazzychaz]

Im interested in a set or two please

 

[andyroo]

These right here?

View attachment 1341903

Yeah, they're the ones. Postage to the UK is about 40 though

 

[Mouse Vader]

At .625 o/d these are even larger than those I posted. If they're in your back yard though a little trimming would work. But if your modifying why not get a normal flat washer the right size & bevel it? it would be easier & cheaper.

If the orig part is vintage UK (in 1970's) then the part code is going to start BS Sp as far as I've been to get so far. BS stands for British Standard & I think the SP stands for special purpose.

 

[andyroo]

There's a few different sizes of the ARP brand washers. When I looked there was a set that was pretty close

 

[Halliwax]

These right here?

View attachment 1341903

That’s the only brand I’ll use for high performance engines

Have you had any luck machining these? ARP is usually hardened steel

 

[NathanM]

That’s the only brand I’ll use for high performance engines

Have you had any luck machining these? ARP is usually hardened steel

I diudn't get them. I settled on the ones Schrodinger and I found.

 

[Halliwax]

I diudn't get them. I settled on the ones Schrodinger and I found.

I bet they would be a biotch to machine

 

[onderon]

According to this webpage the MS20002C5 was first used in 1963.

5310-00-595-7078 - RECESSED WASHER, MS20002C5, NAS1435C, NAS143-5C | WBParts

www.wbparts.com

 

[onderon]

What do you guys think of these?

(300) 5/16 x 1/2 x 1/16 Boeing Aircraft Recessed Countersunk Washers BACW10CT10 | eBay

Boeing Aircraft p/n: BACW10CT10 Recessed Countersunk Washers in new surplus condition. Technical Characteristics BACW10CT10. 81205-BACW10CT MANUFACTURERS STANDARD. SPECIFICATION/STANDARD DATA. STYLE DESIGNATOR.

www.ebay.com