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Rev. Doug Miller WR Addict Offline Working flat so I can support my addiction. Posts: 9,601 Hardinsburg, KY Kentucky USA Gender:	Screw Chuck Issue Jan 22^nd, 2006 at 8:09am My issue is a bit different than Woodchip's. I have one of the old screw chucks, the one there a heavy screw passes through the chuck body. I use one for a jam chuck once in a while. Anyway, the screw broke. Does anyone know what size that screw is?
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JimQuarles WR Addict WR Patron Offline WR Rocks, BIG Time! Posts: 13,194 Glendale, AZ Arizona USA Gender:	Re: Screw Chuck Issue Reply #1 - Jan 22^nd, 2006 at 5:26pm It is about that large. What brand screw chuck do you have? I know the Craftsman had a stud type arrangement where you could unscrew the old one to replace it.But I forget the size. ??? JimQ
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Gil Jones Ex Member	Re: Screw Chuck Issue Reply #2 - Jan 22^nd, 2006 at 6:47pm Doug, check this out Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to or Your screw chuck may be a different size stud, but it can be drilled and tapped. More variety here Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to or
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Jim Underwood WR Addict Offline It's better to turn than burn... Posts: 648	Re: Screw Chuck Issue Reply #3 - Jan 22^nd, 2006 at 7:17pm Hey Rev, I asked this question on my craftsman screw chuck about a month or so ago. For some reason I think Jim remembered the part number there. Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to or Hope this helps.
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Rev. Doug Miller

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Working flat so I can
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Hardinsburg, KY
Kentucky
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Gender: male

Re: Screw Chuck Issue
Reply #4 - Jan 23^rd, 2006 at 11:38am

This thing is a standard ShopSmith screw chuck. The "stud" is nothing more than a heavy screw. And unfortunately, I tossed the broken one. So I have nothing to compare to. I'm guessing that the best thing is going to be to take the chuck body to the hardware store and get a screw that just goes into the chuck hole. Sound about right? 8)

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AndyC WR Noob Offline Posts: 10 Gender:	Re: Screw Chuck Issue Reply #5 - Jan 23^rd, 2006 at 4:33pm I've found that large sheet metal screws (self tapper's?) work well and are readily available at hardware stores.
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JimQuarles WR Addict WR Patron Offline WR Rocks, BIG Time! Posts: 13,194 Glendale, AZ Arizona USA Gender:	Re: Screw Chuck Issue Reply #6 - Jan 23^rd, 2006 at 10:41pm Sounds right, get the biggest that will fit in it. If they offer a grade 8 version, get it. Some hardware stores carry the more expensive grade 8, they are much less likely to snap. JimQ
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Jim Underwood WR Addict Offline It's better to turn than burn... Posts: 648	Re: Screw Chuck Issue Reply #7 - Jan 24^th, 2006 at 10:27am I'm not sure about that Jim... I would theorize that grade 8 bolts are harder (and more brittle) and therefore may be *more* likely to snap. The milder steel is more malleable and may be better in a situation where it is under flexion. I wonder... ???
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Gil Jones Ex Member	Re: Screw Chuck Issue Reply #8 - Jan 24^th, 2006 at 3:55pm I think that the higher number grades are "tougher". Able to absorb more torque and stress ("I Think" being the operative words here).
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Re: Screw Chuck Issue
Reply #9 - Jan 24^th, 2006 at 6:28pm

Well in my years as auto mechanic, the grade 8 bolts were always referred to as "harder". I also remember several articles that mentioned not using grade 8 bolts on things like turbo-chargers because they tended to shear off with all the contraction and expansion of the exhaust caused by the super heating going on with a turbo.

I could be wrong, but that's my take on it.

It would be good to have some input from tool designers or engineers at this point...

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Gil Jones

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Re: Screw Chuck Issue
Reply #10 - Jan 24^th, 2006 at 8:35pm

Underdog, you may be correct about grade 8 bolts being hard to the point of somewhat brittle. Here are a few good articles.

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JimQuarles WR Addict WR Patron Offline WR Rocks, BIG Time! Posts: 13,194 Glendale, AZ Arizona USA Gender:	Re: Screw Chuck Issue Reply #11 - Jan 24^th, 2006 at 8:54pm The Turbo bolts on my semis were grade 12 I think. JimQ
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Gil Jones Ex Member	Re: Screw Chuck Issue Reply #12 - Jan 25^th, 2006 at 8:19am Grade 8 is as high as that rating goes, at least in the USA.
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Jim Underwood

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Re: Screw Chuck Issue
Reply #13 - Jan 25^th, 2006 at 9:25am

Gil you are exactly right.

SAE (Society of Automotive Engineers) standards for bolts:
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And a whole bunch of other standards here:
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Well if the old propane powered bread trucks I used to work on were any indication, exhaust bolts get harder with age. The constant movement, heat treatment and oxidation really cause some hardening.

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« Last Edit: Jan 25^th, 2006 at 9:31am by Jim Underwood »

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