Thx for feedback, before I bought what I did I (and store clerk) looked all over that store and did not see any high strength bolts in what I needed.
There's a steel collar the bolt goes thru, and then 2 rubber bushings to isolate vibrations, so need to fit inside that collar.
8mm = 0.31496" , while 5/16 = 0.3125" , so 5/16 is largest I can go.
I'll see if McMasters has the correct hi strength flange bolt online I can get.
http://www.mcmaster.com/
striking out, nothing 120mm long flange bolt
Strike 1
http://www.mcmaster.com/#metric-flange-screws/=10zsszt
Strike 2
http://www.mcmaster.com/#12-point-fl...crews/=10zsud6
Strike 3, these are almost there, 5/16 x 4" = 100mm, I need 4 1/4 "
http://www.mcmaster.com/#flange-head-screws/=10zsvbq
second inning, normal cap screw;
1st base
http://www.mcmaster.com/#standard-cap-screws/=10zsx2k
These seem exactly what I need: $8.48 for a pkg of 5, 4 1/4"
4 1/4" 7/8" to 1 3/16" 5 91257A607 8.48
Quote:
The standard for high-strength cap screws, these are made from alloy steel and have a minimum tensile strength of 150,000 psi. Length is measured from under the head.
Inch screws are marked on the head with six radial lines to indicate Grade 8. Screws have a minimum Rockwell hardness of C33 and a Class 2A thread fit. They also meet ASME B18.2.1 and SAE J429, unless noted. Screws with material certification come with a traceable lot number and a physical and chemical report.
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Before I went to the hardware store, I called my local dealer seeing if he had these in stock, he told me to try a local hardware store ...
Based upon my few dealings with him, I've relegated him to a dealer only, not a service provider of parts. I now know my dealer is really more of an assembler.