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Sean Campbell
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Hello all, I’m looking for a grade 8 bolt that will fit in the gearbox screw hole to lock the rotor on an Emerson. The local hardware store didn’t have a grade 8 that would fit. Thanks!

John Smalley
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tom newcity sells them

Steve Sherwood
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1/4 20 harden bolt is all you need. Most hardware stores sell them. I don't know what hardware store you went to, but they are pretty common.

Steve Stephens
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Look in those cardboard holders in small shelves for odd bolts, washers, etc. that most hardware stores have.   I bought some black oxide "cap bolts" in 1/4 x 20 for the larger Emersons and the smaller size below for some of the smaller fans but there is yet a smaller bolt I think to fit some other 8 or 9" Emersons.   Be sure the bolt you buy has sufficient length of threads to reach the rotor.   Nobody could tell me if the bolts I bought were grade 8 or hardened but I'm pretty sure they are hard.  I bought two for each size fan to place in both of the upper gearbox holes.



Jim Kovar
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Steve Stephens wrote: Nobody could tell me if the bolts I bought were grade 8 or hardened


Steve Stephens
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That's interesting information.   Maybe I need to buy a smart phone to get smart when I need to.   Thanks for the info Jim.

Sean Campbell
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Bolts have been located and purchased. Thanks for the help guys!

Richard Daugird
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I wonder how accurate that info is? According to the first two charts I looked at, alloy steel socket head cap screws are rated at 180,000 tensile strength, and 162,000 yield strength; while greade 8 cap screws are 150,000 and 130,000, respectively. I'm not saying they won't hold a rotor whilst removing a blade, I'm just sayin'...
Jim Kovar wrote: Steve Stephens wrote: Nobody could tell me if the bolts I bought were grade 8 or hardened



Richard Daugird
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http://lightningboltandsupply.com/grade-8-bolts.html

https://www.aftfasteners.com/socket-cap-screws-dimensions-and-mechanical-properties/

Jim Kovar
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BTW & FYI,...

the way not to cut
SHCS's to length...



Steve Stephens
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Jim Kovar wrote: BTW & FYI,...

the way not to cut
SHCS's to length...
What is SHCS?

Richard Daugird
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socket head cap screws

Steve Sherwood
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Jim Kovar wrote: BTW & FYI,...

the way not to cut
SHCS's to length...



Those will not cut a hardened bolt very well, they will cut the cheap alloy bolts.

Last edited on Sun May 12th, 2019 07:46 pm by Steve Sherwood


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