Material for eccentric/alignment bolt Material for eccentric/alignment bolt crashnscar (Mechanical) (OP) 4 Feb 12 12:39 Making alignment/eccentric bolts and I'm not sure what material to specify as I'm not the best with materials. Obviously going to be some steel, but how would I specify say a Grade 8 bolt steel? RE: Material for eccentric/alignment bolt KevinK2 (Mechanical) 17 Feb 12 13:00 ASTM A354, BC or BDhttp://www.portlandbolt.com/technicalinformation/astm/ASTM_A354.html. RE: Material for eccentric/alignment bolt pwildfire (Mechanical) 29 Feb 12 12:58 Grade 8 bolts are typically made from SAE 4140 steel. Any machine shop will have pre-hardened steel in this grade that will be approximately the same strength as an off the shelf grade 8 bolts. RE: Material for eccentric/alignment bolt KevinK2 (Mechanical) 29 Feb 12 14:09 I though B7/Gr5 were 4140, and A354-BD/Gr8 were 4340 or a similar higher alloy, to answer OP's direct question.http://www.americanfastener.com/technical/grade_markings_steel.asp RE: Material for eccentric/alignment bolt pwildfire (Mechanical) 1 Mar 12 08:51 Grade 8 and A354BD are both alloy steel with Tensile >150ksi, Yield >130ksi, and A354 stipulates >14% elongation. From Machinery's handbook, 4140 tempered to 900F will exceed all of these requirements. 4340 @1100F will be similar mechanically, but is less available, especially as a pre-hard bar.I didn't have time to pull a cert and see what actual properties of as-recieved material are, but they are typically right in this area for 4140.I don't recall off the top of my head, but I believe the chemistry requirements for these types of fasteners are pretty lax.In any case, as far as the original question, 4140 Q&T is your best bet, as it is what most shops are likely to have on the shelf. RE: Material for eccentric/alignment bolt Tmoose (Mechanical) 2 Mar 12 12:24 Can't adapt one from a Corvair/Corvette/etc ?http://www.ebay.com/itm/C2-C3-Corvette-Camber-Rod-Adjustment-Bolt-Kit-/350533242709A buddy bought a set from a specialist and the bolt head is "marked" with 4 lines all in a 180 degree arc, and ABW or BAW.the eccentric plates fit nicely. RE: Material for eccentric/alignment bolt KevinK2 (Mechanical) 5 Mar 12 13:59 wildfire, he asked for Gr8, which I gave him. But for his application, I think the Gr5/B7 (4140 spec) is better, as it is likely to have less notch sencitivity, a good thing for a notched cam adjuster. Hopefully it will be torqued with enough preload to make a friction shear connection. Also, he could do as I have done; buy a larger Gr5 bolt from a hardware/car-parts store, and have it machined to spec.