Cast Iron Tread

[PEinVA]

I'm looking to have a cast iron tread attach to a C12 stringer for an exterior stair. How would I go about attaching this to the steel? I could use end angles, but I can't weld the two metals, what type of bolts do I use for the attachment?
Thanks.



RC
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke

 

[CoryPad]

Can you use standard hexagon head bolts? ASTM A 325 is a good place to start:

http://boltcouncil.org/files/2004RCSCSpecification.pdf

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[PEinVA]

Cory,
I could use that to attach the angle to the stringer, but not the tread. I'm looking for an underside mounted screw or a low profile bolt that could be installed from the top of the tread but would not cause a tripping hazard.

Thanks for your help.



RC
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke

 

[kslee1000]

Have you try to look into grating manuf's literatures for clamps. It might work for your case, if you insist on using edge seat angles. Otherwise, like Cory suggested, connect the thread directly to the stringers through bolting, it's not unusual if the thread end bar is capable of taking such load.

 

[unclesyd]

I have seen both slotted head cap screw or the flat head machine screw use to bolt on CI steps.

http://www.smithfast.com/msflathead.html

http://www.bestnutsbolts.com/mchscrew.html

 

[gtaw]

Most of the cast iron treads I've seen use countersunk bolts (stove bolts may be what they are called).

I wouldn't suggest a high strength bolt that might be fully tightened and then crack the tread. Regular machine bolts with a counter sunk head should work nicely.

Best regards - Al

 

[dvd]

For those of us who are unaware of cast iron stair treads, could you post a picture or a link to a description? It seems a little odd to have a product that doesn't have a mounting method already worked out.

 

[unclesyd]

A lot CI treads have mounting holes in them as received. Having pre drilled holes dictates the location of the supports so a lot of people opt out for the undrilled version of the treads.

 

[dinjin]

Would tapered pins hold these in place?