Guys.....I had this same conversation last year with the Triumph and 6-Pack Mail Lists because the TRF & Moss price per bolt was in the $2 & $3 range. The reason for the price is that these are "special" bolts that have a precision ground shoulder. A stock bolt, be Grade 5 or 8 or standard does not have this type of shoulder.....with the result being an improper fit where you need it most.....at the shoulder. We had the same conversation about
Locating Dowels used for various engine and tranny alignments. Someone actually just gave me an excellent explanation, quoted below.
Bottom line is that a bolt is not just a bolt depending on how and where you're going to use it. The drive shaft, axles, calipers etc all require these special bolts with precision ground shoulders.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:]Locating Dowels are ground to less than a half thousandth for a precision fit. A miss alignment of .005 can wear out a spigot bearing and cause the input shaft bearing to also wear early. All regular bolts are undersized to fit the same size hole. I.E. a 5/16” bolt is three thousands under .312”, normally .309”. However this will vary with different manufacturers. The range for American manufacturers is around .3085 to .310. We should NEVER use Chinese nuts or bolts. They vary from .312 down to about .307. The metallurgy is far below SAE standards, they break at the absolute wrong time and is the most inaccessible place.. I only use grade 5 or above American bolts from any large fasteners company that will certify them American. [/QUOTE]