Grade 8.8 or equivalent clevis pins
Grade 8.8 or equivalent clevis pins
(OP)
Hi All,
Is there a reason why clevis pins are not graded? I have a steel rope anchor point that I want to secure with a clevis pin but all of the ones I can find on line are stainless steel or free cutting steel with no where near the strength of graded fasteners??
Cheers
Is there a reason why clevis pins are not graded? I have a steel rope anchor point that I want to secure with a clevis pin but all of the ones I can find on line are stainless steel or free cutting steel with no where near the strength of graded fasteners??
Cheers





RE: Grade 8.8 or equivalent clevis pins
RE: Grade 8.8 or equivalent clevis pins
Regard
Stonecold
RE: Grade 8.8 or equivalent clevis pins
A shackle and its pin are designed and tested as a complete/integral system/unit, with a specified factor of safety w.r.t. unit’s safe working load. I certainly would assume that the manuf’er. should be able to tell you what material their product is made of. I would think you can use any pin material you want, as long as you design the new system so your pin is not the failure mechanism. This redesign should also include the pin itself, the pin hole and pin plate (padeye) to assure compatibility of the entire lifting/force system. A new pin of greater strength, with a smaller dia., or some such, is not always an optimal solution. Particularly if it over stresses some other part of the force reacting system.
RE: Grade 8.8 or equivalent clevis pins
Aircraft clevis pins are graded as follows: Made of alloy steel per specification MIL-P-5673 and cadmium plated per QQ-P-416A, Type lI, Class 3. Provided with drilled hole for cotter pin. Used with clevis forks and in secondary controls which are not subjected to continuous operation.
You might also look at an aircraft clevis bolt. Of course I have no idea what size you need, and these may be way too small.
B.E.
You are judged not by what you know, but by what you can do.
RE: Grade 8.8 or equivalent clevis pins
http://www.everyspec.com/MS-Specs/MS3/MS35000-MS35...
http://www.everyspec.com/MS-Specs/MS2/MS20000-MS20...
Of course, these clevis pins won't cheap.
RE: Grade 8.8 or equivalent clevis pins
RE: Grade 8.8 or equivalent clevis pins
RE: Grade 8.8 or equivalent clevis pins
B.E.
You are judged not by what you know, but by what you can do.
RE: Grade 8.8 or equivalent clevis pins
RE: Grade 8.8 or equivalent clevis pins
The short thread length is because the nut involved is a shear nut.
These bolts are designed to be a direct replacement, for a clevis pin in a clevis fork, which is loaded in shear only.
They are also available with a drilled shank for use with a castellated nut for extra security .
B.E.
You are judged not by what you know, but by what you can do.
RE: Grade 8.8 or equivalent clevis pins
One thing to be careful about if you are going to replace a clevis pin with a shear bolt is to make sure the shear bolt has the correct grip and thread length to ensure the threaded portion of the bolt is never loaded in shear. This is the reason shear bolts have short, fixed thread lengths. When selecting the grip length of a shear bolt, make sure the body fully extends thru both lugs, and then use as many washers as necessary to ensure the nut does not bottom out on the short bolt threads when tightened.
Good luck.
Terry