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Grade A bolt?

J

JollyRogers

New User
This bolt is 7/16 with 14 thread Marked A and is 1 1/4 long. What grade bolt is this?

A few of these and some marked T 1035 were holding the engine to the transmission on a TO 20. I would like to replace them as they show pitting on the threads and this tractor was used with a loader.

Thank you
mvphoto40308.jpg
 
I'm going to guess the A is either a brand name marking, or an identifier for pricing, as in the bin at the big box store.

Either way, I would consider it a grade 2 or less. Not suitable for that application.
 
See the hash mark at about 10 o'clock? A Grade 5 will have 3 of these, at 10, 2 and 6 o'clock. Should be fine for what you're doing. Grade 8 will have more hash-marks, but is probably a higher grade than you need for that application.
 
A stands for arbitrary. (not really, just there is no accurate way to assess the bolt. The other bolt is also an unknown head stamp. I would consider
grade 8 Jim
 


I wouldn't be calling that little shadow one of the three lines meaning grade 5. Way to thin. Chuck it.
 
(quoted from post at 14:02:12 07/29/19) This bolt is 7/16 with 14 thread Marked A and is 1 1/4 long. What grade bolt is this?

A few of these and some marked T 1035 were holding the engine to the transmission on a TO 20. I would like to replace them as they show pitting on the threads and this tractor was used with a loader.

Thank you
mvphoto40308.jpg
Click to expand...

You can enter the parts catalog as a guest on the AGCO site, which will show you the current part number, 353700X1, and a little digging around the 'net will show you it's a Grade 5 bolt.
 
Using Bob's information below if a Grade 5 is what the joint is designed for I'd definitely use a Grade 5 and not something higher. To torque a Grade 8 enough to get the bolt stretch
necessary to keep the joint tight you could pull the threads in the tapped holes. A Grade 8 bolt torqued to Grade 5 specs doesn't create a stronger joint and could result in the hardware
not staying tight.
 
(quoted from post at 20:16:32 07/29/19) Using Bob's information below if a Grade 5 is what the joint is designed for I'd definitely use a Grade 5 and not something higher. To torque a Grade 8 enough to get the bolt stretch
necessary to keep the joint tight you could pull the threads in the tapped holes. A Grade 8 bolt torqued to Grade 5 specs doesn't create a stronger joint and could result in the hardware
not staying tight.
Click to expand...

Brendon, very true. I have a torque guide in my shop library that tells me what torque to apply to what size and grade bolt going into what material. The material needs to be protected from over- torquing, and the real "GLUE" that is being relied upon is the stretch of the bolt.
 
(quoted from post at 16:02:12 07/29/19) This bolt is 7/16 with 14 thread Marked A and is 1 1/4 long. What grade bolt is this?

A few of these and some marked T 1035 were holding the engine to the transmission on a TO 20. I would like to replace them as they show pitting on the threads and this tractor was used with a loader.

Thank you
mvphoto40308.jpg
Click to expand...

That is likely an Acme Screw Company bolt. Years ago manufacturers would use registered marks.
That style of "A" was for Acme Screw Co.
The one a-frame connector line indicates a standard carbon steel bolt. More than one line would mean different types of stainless steel bolts.

https://www.electronicfasteners.com...09/northamericanmfgidentificationmarkings.pdf
 
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