might be an idea to take the bolt to an engineering supplier and find out what it is

or use a micrometer to accurately measure the thread diameter, count the thread pitch and use a chart to sort it out

the 3/8 -24 above is probably a fine 24 threads per inch

http://www.nutsandbolts.com/38-24-x-1-fine-grade-8-hex-bolts-hex-head-cap-screws-qty1-p-1578.html

http://www.nutsandbolts.com/technical-info-threads-per-inch-reference-table-c-43_268.html

http://www.vsource.org/VFR-RVF_files/Boltthreads.htm

http://www.engineershandbook.com/Tables/metrictapdrill.htm


Last edited by erice; 05/16/12 04:12 PM.
eric e
1982 nacra 5.2 - 2158
2009 weta tri - 294