Ask the Expert

Question: Can a carriage bolt be supplied to the A325 specification?

Answer: Technically, carriage bolts cannot be manufactured to the A325 specification. Read More...

Question: Can I substitute Grade 5 or A449 bolts for F1554 grade 55 bolts?

Answer: In most circumstances the answer is no. For Grade 5 the answer is never. Read More...

These bolts are identical with regard to strength and chemistry. There are very minor differences in the hardness requirements, but the proof load, tensile, and yield strength requirements are the same. Read More...