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I am quoting an aerospace fitting that has a material callout of "Aluminum Alloy L102" in 2.5"Dia. bar. Does anyone know of a possible source? Is there a similar material that is more availble? Thanks

Sounds like fretting corrosion. Normally caused by high contact stresses with slight relative movements on materials that readily oxidize. More length of contact may reduce stress, more lubricant may reduce oxidation. Good luck.

Hello, The pitch diameter measurements are correct. The material consisted of sawed blanks 1.25" long from a forged and rough turned bar 16.6" dia. I milled slots to various depths and checked hardness with the following results: .000"-55Rc, .040"-47Rc, .070"-42Rc, .100"-40Rc, .140"-38Rc.

Hello, The between pin measurement pre-heat-treat was 4.955". After heat-treat low part was 4.973",high part was 4.995" The order was 33 parts. The large diminsion change is what I am questioning. Thanks.

Hello, I am having trouble with a heavy clutch plate with internal spline teeth. The part is 16"OD 5"ID 1.1"thick 8620 steel. After case-hardening 54-58Rc .040"total deep, the pitch dia. of the spline grows .020"-.040" on different parts in the same heat. Is this to be expected?

I am making a replica of an 1880s vintage single-shot action. I've machined the structural parts(receiver,breechblock) out of 8620H barstock. I want to "case-color" harden these parts which involves pack carburizing in bone&wood charcoal and a water quench out of the furnace. Most...