- Joined
- May 27, 2016
- Messages
- 3,452
It's about getting hooks or shackles into lifting eye-bolts. The load is a floor standing planer thicknesser woodworking jointer with cast iron tables. The crate said 240kg (529 pounds), but the actual weight is much less, about 180-200kg (around 400 pounds). There were four M6 lifting bolt holes, but only two M6 eye-bolts provided. Thus, we are never in any danger of bolt fails. Even one 1/4" -20 lowest grade 2 bolt is good for 1750lb. The problem is that the dinky little 10mm inner diameter is too small to fit any straps, shackles, nor hoist hooks that I have to hand.
Just to get a hook into it, I resort to eBay, for a 20mm inside diameter, with a M6 thread. When it arrives, it just "looks wrong"!
1.77kN is about 400 pounds with safety factor x 6, and I will be using four of them!
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Maybe the reason it looks wrong is the little threaded piece on the eBay offering has a thread gutter 33 thousands undersize at 4.16mm, when it should be 5mm, (freely mixing units here)!
Easily the sloppiest fit for a M6 I have ever come across. I have tapped some holes I was a bit ashamed of, but 0.012" slop I never did get to!
Just to get a hook into it, I resort to eBay, for a 20mm inside diameter, with a M6 thread. When it arrives, it just "looks wrong"!
1.77kN is about 400 pounds with safety factor x 6, and I will be using four of them!
_
Maybe the reason it looks wrong is the little threaded piece on the eBay offering has a thread gutter 33 thousands undersize at 4.16mm, when it should be 5mm, (freely mixing units here)!
Easily the sloppiest fit for a M6 I have ever come across. I have tapped some holes I was a bit ashamed of, but 0.012" slop I never did get to!