[RE-wrenches] SS Tek Crews

[Mick Abraham]

To use a 1/4" fastener with an L-foot mounting slot that's bigger, one could
use a "shoulder washer" or a "flange bushing". Those might be good search
terms to use at, say, mcmaster.com

One must wonder if the pull-out resistance of the 1/4" Tek screw is adequate
for the wind-loading etc. There's some math to be done which may point to
the need for bigger diameter screws anyway.

Jolliness,

Mick Abraham, Proprietor
www.abrahamsolar.com

Voice: 970-731-4675


On Fri, Oct 23, 2009 at 9:18 AM, jay peltz <jay at asis.com> wrote:

> HI Guys,
>
> Check out dynamic fastener,
>
> they have a lot of great stuff.
>
> Including self drilling 1/4x 20 SS screws and larger.
>
> jay
>
> peltz power
>
> On Oct 23, 2009, at 3:12 AM, Carl Adams wrote:
>
>  Hello Wrenches,
>>
>> Pulling up this thread from earlier in the year.  I have a couple of
>> upcoming jobs where I am attaching PV mounting structure  as follows
>> Job 1) LFoot to metal roof into Z purlin, and Job 2) FastJack to metal
>> roof into bar joist.
>>
>> In both of the applications I'm considering the Tek screw type
>> attachment to the building steel.  Both the L foot and FastJack are
>> sized for a 5/16 - 3/8 lag or bolt.  Most of the self tappers I see
>> are 1/4" max diameter.  Should I be concerned about the undersized fit
>> of the fastener in the mounting attachment or are there large Tek type
>> screws out there I'm not finding?
>>
>> Does anyone have pullout strengths for this type of attachment?
>>
>> With Regards
>> Carl Adams
>> NABCEP Certified PV Installer
>> SunRock Solar, LLC
>>
>> On Thu, Feb 5, 2009 at 6:51 PM, Peter Parrish
>> <peter.parrish at calsolareng.com> wrote:
>>
>>> Does anyone have a source for stainless steel, self tapping Tek screws? I
>>> could use some #10/3-4 and #10/1-1/2. If they have the little cap and
>>> neoprene washer that would be even better!
>>>
>>> - Peter
>>>
>>> Peter T. Parrish, President
>>> California Solar Engineering, Inc.
>>> 820 Cynthia Ave., Los Angeles, CA 90065
>>> Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
>>> CA Lic. 854779, NABCEP Cert. 031806-26
>>> peter.parrish at calsolareng.com
>>>
>>>
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