413 shear bolt grade

[wirlybird]

Grade 2 is not a good idea for a 4ft brush hog as you will be shearing them all the time. I doubt they are good for any size hog. Neither is the 3/8" which almost fits but is loose in the 413. Metric 8.8 strength bolts as I described above are the correct ones, are the same strength as Grade 5 SAE bolts and are the Deere OEM type. We are talking a JD 413 small brush hog here and they do not take 1/2" shear bolts or whatever metric size is close to that. Your cutters are no doubt larger.

The manual on my JD RC2048 specifies grade 2, along with my other cutters when using a shear as opposed to a slip clutch.
I mentioned 1/2 inch only as a reference to the size my cutters use.

 

[oosik]

For 27 years I used grade 2 machine bolts on my snow blower. For that matter - it's what the manufacturer recommended. There was no such thing as a custom shear bolt for that blower.

 

[JWR]

I do. The OEM King Kutter driveline was a shear bolt only. I needed a longer driveline and got a used Walterscheid with a slip clutch. It attaches to the gearbox with the same shear bolt as the KK OEM driveline so I am in effect "running both."

Neat. The only slip clutch to gearbox connections I had seen are splined or some means of making the connection totally non-slip/non-shear at the gearbox. The way you are set up you could run with a stronger shear bolt (like a Grade 8 or in metric sizes a 10.9) and make that the backup for the slip clutch. Really pretty nice though maybe overkill. In your case I would be especially attentive, making sure the shear bolt is the snug fit/right size and not one that is a little loose. You don't want to have shear happening when you have a slip clutch there to be forgiving as they are.

 

[Williy]

You can call a shear bolt CUSTOM but a
shear bolt is NUMBER 2 not matter what
you call it as its just the diameter and length
that counts and #2 bolts are recommended
for a large percent of equipment. Using slip
clutch and shear pins are a safety factor.
Example something gets stuck into your slip
clutch and jams and the blades will not turn
but you have the shear bolt as backup so
your equipment is saved from major damage!!

willy