Can Portland Bolt manufacture A325 countersunk bolts?
The A325 specification specifically states that an A325 must be a heavy hex head structural bolt, so a countersunk bolt cannot be manufactured to the A325 specification. The specification also advises that for any other general application, in this case a countersunk bolt, where the strength of an A325 is required, the A449 specification should be used as it has virtually identical strength and chemical properties. Portland Bolt can manufacture the A449 countersunk bolts in other grades as well, starting at ½” through 1½” diameter. If the grade of a countersunk bolt is ever in question, it would always be best to contact Portland Bolt and discuss the grade options.