yes I know you probably never bothered to look and don,t really care UNTIL you start having problems, but it really does help if you understand what the limitations are to fastener strength. and in most cases bolts ARE marked to allow you to at least have some idea as to there limitations
theres a GREAT DEAL OF INFO IN THE LINKS
most experienced mechanics have a 5 gallon bucket of assorted bolts and screws to fall back on when they can,t locate a fastener they break or misplace, youll need to clean used bolts with solvent and a wire brush, but having a bucket of spare fasteners is nearly mandatory, A visit to a local salvage yard with several wrenches and a bucket and a couple hours time, will generally allow you to collect a wide random selection ate a very reasonable price , now you may not find exactly every bolt diameter and length and thread size but you will generally find youve accumulated a good basic selection
https://www.boltdepot.com/Thread_detective_-_Metal.aspx
https://www.threadtoolsupply.com/inch-metric-thread-checker.html
every mechanic should own a decent 12" caliper to measure the length of a bolt,
that may be missing on any particular application.
bolts used on any application, must not bottom out in a blind bolt hole if the bolt bottoms out it fails to clamp firmly
bolts that are not threaded into a blind hole should extend at least two to three times,
its diameter past the far surface too allow a washer and nut to be threaded onto the bolts extended end to supply clamping force.
so the depth of the item being clamped and the threaded area the bolt secures its threads too should generally be at least 1/4" deeper than the length of the bolt used,
and the threads should extend at least 2-3 times the bolt diameter into the threaded area,
before the bolts clamping force is applied to clamp the item being secured.
obviously you can get a rough measurement with the base of the caliper.
and when in doubt select a GRADE #8 fastener,
as they are significantly stronger than average garden variety hardware store bolts.
http://www.northerntool.com/shop/tools/product_200308979_200308979?utm_source=CSE&utm_medium=Shopzilla&utm_campaign=Construction > Measuring Tools > Calipers&utm_content=56248
http://garage.grumpysperformance.com/index.php?threads/bolts-a-bit-of-useful-info.4868/#post-13372
http://garage.grumpysperformance.com/index.php?threads/parts-coming-loose.11008/#post-48646
http://www.wikihow.com/Use-a-Vernier-Caliper
https://www.boltdepot.com/Thread_detective_-_Metal.aspx
http://www.kimballmidwest.com/Catalog/M ... vellon.pdf
http://www.fastenal.com/content/feds/pd ... alling.pdf
http://www.agriculture.com/machinery/to ... 2192?print
http://garage.grumpysperformance.co...-and-assorted-spare-parts-in.3557/#post-20834
http://mgaguru.com/mgtech/universal/ut121.htm
http://www.unified-eng.com/scitech/bolt/boltmarks.html
http://www.ssina.com/fasteners/
http://www.kimballmidwest.com/catalog/M ... vellon.pdf
http://www.boltdepot.com/fastener-infor ... chart.aspx
http://www.zerofast.com/markings.htm
http://www.nutsandbolts.com/v1-bolt-grade-markings.html
http://www.mechanicsupport.com/AN_bolts.html
theres a GREAT DEAL OF INFO IN THE LINKS
most experienced mechanics have a 5 gallon bucket of assorted bolts and screws to fall back on when they can,t locate a fastener they break or misplace, youll need to clean used bolts with solvent and a wire brush, but having a bucket of spare fasteners is nearly mandatory, A visit to a local salvage yard with several wrenches and a bucket and a couple hours time, will generally allow you to collect a wide random selection ate a very reasonable price , now you may not find exactly every bolt diameter and length and thread size but you will generally find youve accumulated a good basic selection
https://www.boltdepot.com/Thread_detective_-_Metal.aspx
https://www.threadtoolsupply.com/inch-metric-thread-checker.html
every mechanic should own a decent 12" caliper to measure the length of a bolt,
that may be missing on any particular application.
bolts used on any application, must not bottom out in a blind bolt hole if the bolt bottoms out it fails to clamp firmly
bolts that are not threaded into a blind hole should extend at least two to three times,
its diameter past the far surface too allow a washer and nut to be threaded onto the bolts extended end to supply clamping force.
so the depth of the item being clamped and the threaded area the bolt secures its threads too should generally be at least 1/4" deeper than the length of the bolt used,
and the threads should extend at least 2-3 times the bolt diameter into the threaded area,
before the bolts clamping force is applied to clamp the item being secured.
obviously you can get a rough measurement with the base of the caliper.
and when in doubt select a GRADE #8 fastener,
as they are significantly stronger than average garden variety hardware store bolts.
http://www.northerntool.com/shop/tools/product_200308979_200308979?utm_source=CSE&utm_medium=Shopzilla&utm_campaign=Construction > Measuring Tools > Calipers&utm_content=56248
http://garage.grumpysperformance.com/index.php?threads/bolts-a-bit-of-useful-info.4868/#post-13372
http://garage.grumpysperformance.com/index.php?threads/parts-coming-loose.11008/#post-48646
http://www.wikihow.com/Use-a-Vernier-Caliper
https://www.boltdepot.com/Thread_detective_-_Metal.aspx
http://www.kimballmidwest.com/Catalog/M ... vellon.pdf
http://www.fastenal.com/content/feds/pd ... alling.pdf
http://www.agriculture.com/machinery/to ... 2192?print
http://garage.grumpysperformance.co...-and-assorted-spare-parts-in.3557/#post-20834
http://mgaguru.com/mgtech/universal/ut121.htm
http://www.unified-eng.com/scitech/bolt/boltmarks.html
http://www.ssina.com/fasteners/
http://www.kimballmidwest.com/catalog/M ... vellon.pdf
http://www.boltdepot.com/fastener-infor ... chart.aspx
http://www.zerofast.com/markings.htm
http://www.nutsandbolts.com/v1-bolt-grade-markings.html
http://www.mechanicsupport.com/AN_bolts.html
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