I am in need of some 12 mm, 1.25 pitch, grade 10.9 or better bolts. I have zeroed out on McMaster/Carr, napa and my local hot rod shop. Help, I need to attach a 360 parking brake caliper to a custom bracket for a real parking brake on my old 308.. Again, in need of help, chris
Make sure it is 1.25, that is very fine for a 12mm. Call 925-932-4484 They are a local industrial fastener supply. They have been good at getting me odd ball metric fasteners.
You could also try Metric and Multistandard <www.metricmcc.com> They have a warehouse in Reno, Nevada. Anton
Mc-master has them in loads of sizes and partial to full thread. don't see why you'd need a 10.9 class the 8.8 has a tensile strength of 116,000psi. most people miss this, the corresponding grade of nut or fastner is different from the bolt. a grade 8.8 uses a 8 nut and a 10.9 uses a 12 nut. however in this case you are looking for a screw since the bolt/nut application isn't here. the threaded hole of the material should meet the screws rating. .625 or 5/8" is the min limit for holding tight joints or parts with high loads, a 12mm is only .472 so it falls below the shear point. so a 8.8 vs a 10.9 in this case wouldn't matter much at all. just a ME's view point
also as a reference point a 8.8 screw will need 54ft/lbs of torque for proper fastening vs 70ft/lbs for a 10.9. 70 is a HUGE amount for that application.
talk about brain fart, a SAE 8 is a metric 10.9 the SAE 5 is a metric 8.8 geesh I need to crack my books a little more often.
They are good. I have also gotten stuff from a place called Mostly Metrics, in the east San Fernando valley of LA, but that was years ago. I'm not sure if they even still exist.
Chris, soem quick calcs for you, the 8.8 M12p1.25 screw will provide a axial clamp load of 574lbs per screw. the screw should fail before the thread strips. for this, it is necessary the shear area of the threaded feature be at least 2 times the tensile area. this assumes the same materials for both, is the female material strength is lower, then the thread length of engagement must be increased to prevent stripping. lay mens terms, if the plate is aluminum then the 10.9 screw would be pointless unless the thread engagement length is considered, and with a tensile rating over 120k the aluminum plate would be very thick, i'd have to sit down and work out the calcs.
you can also try: Global Metrics Inc. 519 Marine View St., Ste. J, Belmont CA 94002-0843, United States (650)592-2722, USA (650)591-5396 fax I've been able to find fasteners there in the past. Very helpful.
Before stressing out or plunging into cyberspace, you might want to try the local Ace Hardware. I've gotten an amazing amount of high grade metric hardware from them, as well as sheet brass, and assorted "stuff". When I put the coil-overs in the Celica, I must have made a couple of dozen runs to Ace for bits and pieces and sockets and spanners, and .... (Including stainless 14mm bolts that could stand up to 300Nm torque.)
Thanks guys for all the source recommendations and Scott for the interesting fastener info. I will hit it when i get back to the office this afternoon. thanks, chris
I'm not sure just how far north you are, but just for reference there are two more places in the Bay Area that sell a lot of metric - Olander in Sunnyvale and Mr. Metric in San Jose. But I've had better luck with McMaster and Metric Multi Standard if I can wait for the UPS truck.
The Home Depots in Atlanta must be better than the HDs in CA. The bolt section in my two closest HDs are arranged randomly. Are the 1 1/2" 8-32 next to the other #8 screws or are they with the other 1 1/2" screws? Neither! They could be anywhere in the whole isle! The HD bolt aisles here suck. This is what happens when you hire buger flippers to run a hardware store.
Damn, ya beat me to the punch! For ALL my metric needs I hit the local family owned ACE store here. If they don't have what I need then they'll order it. Near our shop is a Tacoma Screw ( http://www.tacomascrew.com/fastener_products.htm ) and they carry some good stuff as well.
We're not done yet! The following book is the best I've seen for a good introductin to the proper use of bolts and other fasteners, written from an automotive perspective: Nuts, Bolts, Fasteners, and Plumbing Handbook by Carroll Smith http://www.amazon.com/gp/search/ref=sr_adv_b/?search-alias=stripbooks&field-keywords=&author=smith&select-author=field-author-like&title=nuts%2C+bolts%2C+fasteners&select-title=field-title&subject=&select-subject=field-subject&field-publisher=&field-isbn=&node=&field-binding=&field-age=&field-language=&field-dateop=before&field-datemod=0&field-dateyear=2009&chooser-sort=rank%21%2Bsalesrank&mysubmitbutton1.x=26&mysubmitbutton1.y=5
Urban legend says the original title of this book was to be called "Screw To Win", and anybody who has met Carroll Smith will believe it. JM (owns autographed copies of "Tune to Win" and "Engineer to Win")
The HD down the street from the shop cannot find the floor they are standing on. The same people make the buying and organizational decisions. They also bought out the only good hardware store in the area.
We love Manny and Ephraim at "U-Neac Fasteners" in Sacramento. Huge inventory, personalized service. 916 452 4704. Tell 'em Jay sent you.
Thanks Guys, Here is the update: Randy & Anton, Metricmcc truely has a vast assortment, deeeep. But they will only sell me a minimum quantity of 25, at $9.23 each. Scott, Point well taken re grade 8.8 being overkill for screwing into 17mm cast upright. DGS, local ace only goes to 10 mm. Closest home depot is 3 hours away, and if they cannot find the floor, well.... Glad no one mentioned harbor freight. 99% of their "tools" have no place even close to a Ferrari. Napa, ordinarily quite helpfull, cannot find it in their catalogue - it doesn't exist. Carroll Smith will be truely missed. "Screw to Win", that sounds like the man, I haven't found anyone close to his sense of humor. I only had a couple of minutes in the office today, but will try your suggestions, thanks again, chris
