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Old 05-10-2019, 02:34 PM   #61
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What hasn't been said yet is the various self tappers shown have a tendency to shear off while drilling into steel beams. Best to drill a pilot hole with a plain ole steel drill bit first before sending in a self tapper into the beam unless you like moving the stock to a new place and trying again........ It can be a real pain if exact box placement is really critical and the screws snap off in the spot where the box has a hole for securing.
If it's critical, drill a hole & mount the box with a toggle bolt (molly bolt).
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Old 05-10-2019, 03:13 PM   #62
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I cut a piece of 1” EMT about 18” long. Attached the octagon box to it with a U-bolt on the ground. Went up, banged a couple of conduit clamps onto the beam, attached the pipe, done.
So instead of one beam clamp you've got two beam clamps, a piece of pipe and a u-bolt?

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Old 05-10-2019, 03:23 PM   #63
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If it's critical, drill a hole & mount the box with a toggle bolt (molly bolt).
A nut and lock washer is much stronger.
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Old 05-10-2019, 03:42 PM   #64
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A nut and lock washer is much stronger.
True, or double nut the bolt.
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Old 05-10-2019, 03:44 PM   #65
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Just drag the MIG around and fill in the holes in the box.
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Old 05-10-2019, 03:54 PM   #66
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Geeze, all you old timers, stop waving your cane and beam clamps at the neighborhood kids, telling them to get off of your lawn Grab your impact driver, shoot some tek screws into the beam and get back to work
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Old 05-10-2019, 04:54 PM   #67
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So instead of one beam clamp you've got two beam clamps, a piece of pipe and a u-bolt?

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Sure. I had everything on site already. Improvise.
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Old 05-10-2019, 05:15 PM   #68
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I have seen self tappers with long drill tips, but I never really thought that they could be used on thick building steel like I-beams.
When we had a Hilti guy come by the shop at one company I worked I always listened to his sales talks about new stuff they were pushing and that was where I first saw them.
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Old 05-11-2019, 09:33 AM   #69
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We mounted 12 cord reels to 3/8" thick beams this week with the "beam cutter" screws that i call them. Quick and easy !!
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Old 05-11-2019, 10:01 AM   #70
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We mounted 12 cord reels to 3/8" thick beams this week with the "beam cutter" screws that i call them. Quick and easy !!
That's great. Do you have a name, part number, manufacturer or a link?
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Old 05-11-2019, 10:03 AM   #71
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We use Tek 5's for beams. If it's 1/2" or less steel the Teks are the simplest method for us.



http://fastening-solutions.itwbuilde...rilling-screws

We use the 12-24x1.5" climaseal type all the time. The guys keep them on their trucks.
We were setting boxes and straps on 3/8" steel columns.
A local distributor set us to a wholesale screw place. The sales guy was very helpful but said they only sold them in 5000pc boxes.
The price was about $20. That was eight years ago and we are still using them.
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Old 05-11-2019, 11:10 AM   #72
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Quote:
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If it's critical, drill a hole & mount the box with a toggle bolt (molly bolt).
Thank you for the useful information that I have been using when necessary for the last 45 years now. And Hax is right, a nut and machine screw is stronger so more frequently when it's critical I do that .

Ceiling fans in elementary schools by the hundreds. I usually hate hanging ceiling fans , but when you can bid $600 a piece for assembling and hanging customer supplied fans (pipe and wire and switching extra and beyond the 600) since it's a public school, it is one of my favorite tasks........... I usually used the toggles on the steel beams...

Somehow or another this tie's in with the current thread on how much it costs to build a school...
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Old 05-11-2019, 11:14 AM   #73
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Originally Posted by Southeast Power View Post
We were setting boxes and straps on 3/8" steel columns.
A local distributor set us to a wholesale screw place. The sales guy was very helpful but said they only sold them in 5000pc boxes.
The price was about $20. That was eight years ago and we are still using them.
You know those drawers that American Van sells that come with van purchases?
The ones that have ball bearing slides? Always two of the compartments are for the self tapping 1" screws. I buy mine at Industrial Hardware or Tugman . By the caseload.
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Old 05-11-2019, 11:34 AM   #74
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Originally Posted by macmikeman View Post
Thank you for the useful information that I have been using when necessary for the last 45 years now. And Hax is right, a nut and machine screw is stronger so more frequently when it's critical I do that .

Ceiling fans in elementary schools by the hundreds. I usually hate hanging ceiling fans , but when you can bid $600 a piece for assembling and hanging customer supplied fans (pipe and wire and switching extra and beyond the 600) since it's a public school, it is one of my favorite tasks........... I usually used the toggles on the steel beams...

Somehow or another this tie's in with the current thread on how much it costs to build a school...
You should be ashamed of yourself.

On second thought, I love this. It isn’t often we end up with tax dollars in our jeans. Carry on.
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Old 05-16-2019, 01:20 AM   #75
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If you have Hilti powder actuated tool

https://www.hilti.com/c/CLS_FASTENER...ERS_7135/r5356

https://www.hilti.com/c/CLS_FASTENER...OLS_7135/r3650


Or "Bang on" fittings

https://www.erico.com/category.asp?category=R1302
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