No. The specification calls out that those bolts must be Unified National Coarse thread and have class 2A tolerances.
The F3125/F3125M specification reads:
4.2 Threads:
4.2.1 Uncoated bolt threads shall be as specified in Table 1.
4.2.2 Coated bolts shall have threads meeting Table 1 requirements before coating.
TABLE 1
| Thread Fit, ASME | 120 ksi Min Tensile Strength
(A325) |
150 ksi Min Tensile Strength
(A490) |
||
| Type 1 | Type 3 | Type 1 | Type 3 | |
| B1.1 UNC 2A | B1.1 UNC 2A | B1.1 UNC 2A | B1.1 UNC 2A | |
I have a planetary axle shaft with a castle nut for preload for a tapered roller bearing. I’m replacing bearings, seals & race. I the threads seem to be NF, I measured 8 full circumference threads on a 5/8″ thick castle nut.
The axle shaft has one full circumference of thread missing. The nut will engage the missing thread when torqued. Mfg torque spec is 400-450 ft-lbs for bearing load. The axle shaft is 2.250″ in diameter.
I feel I have enough threads with 7 threads to hold this torque load as it is pretty low for this size hardware & it his secured with a castle nut style of retention.
Just asking your opinion?
@Rae- Thank you for your question, but we feel like it is a bit outside our level of expertise. Apologies.