huangyhg

high strength bolt diameters
what are the smallest, largest, and most commonly used a325, a490 bolt diameters?
find a job or post a job opening
h.s. bolt information can be found in aisc. aisc tables in connection list bolt sizes from 1/2" to 1-1/2" for a325 and a490. see page 4-146. this is also repeated in the commentary of the rcsc specifications, see page 5-289.
in asd ninth ed., the connections tables usually start at 5/8" dia. bolts, but the table you referenced does show 1/2" dia. bolts. are 1/2" dia bolts not often used, or a premium charged for them, so that they are not included in the shear and tension tables?
likewise, is there a premium for 1 1/2" dia. bolts?
to answer your question, i would contact a fabricator to determine the usage and/or premium charged for 1/2" and 1-1/2" bolts.
personally, i have specified/designed bolts in the 3/4" to 1" range.
one of the major manufacturers of bolts and screws here in the midwest is st. louis screw and bolt co. their number is 314-389-7500. i don't know if they have a website or not.
good luck.
if you need 2 sizes use 3/4 and 1 inch. do not use 7/8 with 3/4 or with 1. it is hard to tell the difference in field. we had this problem when 3/4 were installed instead of 7/8.
hope it helps.
whymrg---and to all those field hands, erectors, me's etc. who can trace their ancestory to the trees with no more than a generation past---
i have been in a snow storm, even cought out in the rain a time or two, but i'll be darned if i have ever had any of my men put a 3/4 inch bolt in a 7/8th inch hole pattern accept to help make it up! the most common bolt sizes in high rise construction are 3/4in. and 7/8th in. with 1" and 1 1/8" or larger in the lower floors, core column area or special applications. most of the spandrels and some of the major girders are almost universally welded these days and the bolts are primarily for allembly purposes.
i don't know what part of the world your in---so i offer my most sincere appologies to those where the above practice may be accepted as common. no joke, are you putting me on? i have only been at this for 40 years so it is possible i may have missed something.
rod
hey, i've seen upper columns at column splices installed 180 degrees out, even when the columns were marked which side was east-west. i wouldnt put it past steel erectors to install 3/4" bolts where 7/8" are required.
hey you guys - settle down here. you can bash rodbenders but don't bash the structural ironworker!
acutally, i feel that mistakes can happen although many of us are ever vigilante. well, except for the few 9-wire outfits!
rod, what you should explain is that the raisin' gang is responsible for putting the bolts together for the pieces that they are rigging up to be raised. the connectors must rely on them to provide the correct size and number of fit up bolts. the bolt up gang is likewise fed bolts by the 'punk' who runs back and forth with a bolt list that coordinates bolts (dia, grip, etc) to specific locations. thus, misplaced bolts can usually be traced to one or two persons. and the foreman will usually line them up real quick for wasting his time!
sorry, i didn't mean to bash anybody. i've also seen excellent steel erectors that do everything right the first time. i think the problem was when the economy was red hot, everybody in the construction business needed bodies quick, so they'd grab any joe off the street or from the union hall to do work that would normally be done by someone with experience and who knows what they're looking at and doing. therefore, mistakes were made. at the same time, in all our job specs, we specify that all welders be aws certified. i'd go to the field, and not one of them would have their aws card. ive seen full pen welds completely contaminated with slag. i mean, the guy never bothered to remove the slag from his previous pass.
again, there are good people out there who know what they're doing and do it well, and there are complete idiots out there. i've seen both.
qshake, i am humbled by such an eloquent defense.
pylko, it was posted in humor. heck, i have seen some of the "stupidest" things in my 38 years as an ironworker, most of which i won't say because no one would believe them.
point of fact---the only reason i was so successful? i corrected my mistakes before anyone else could see them.(it has been said that if you meet a successful person, you may be assured that he has succeded at least once!)
i know all in this forum should remain largely anonymous, but it would be "nice" to see a short bio. just to give us an idea who we are conversing with, don't you think?
rod
evelrod, i thought it was funny. then i read qshakes response, and it sounded like someone might be pissed! not me, pal, it takes a little more than a forum on the web to get my goat!
like you said, it's only a mistake if you dont catch it before someone else does.

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