What is an A325T bolt?
An A325T bolt is a fully threaded version of an F3125 grade A325 heavy hex structural bolt. The F3125 specification is very specific when it addresses thread lengths. Standard A325 bolts have very short thread lengths due to their application as a bolt intended for use in structural steel connections since often it is undesirable for threads to be included the shear plane.
Fully threaded A325 bolts are marked on the head of the bolt with “A325T” instead of “A325”. Another very important aspect of an A325T bolts is that they are limited to 4 times the diameter in length. For example, 3/4″ A325T bolts cannot exceed 3″ (four times 3/4″) in length and 1″ diameter A325T bolts cannot exceed 4″ (four times 1″) in length.
S1.1 A325 and A325M Bolts with nominal lengths equal to or shorter than 4D may be threaded full length. These bolts need not have a shoulder.
Modified head geometry or special thread lengths are permitted under Supplementary Requirement S2. When invoked, the bolts are marked “A325S” to designate that something about the bolt varies from a standard A325.
S2.1 Dimensions which differ from the requirements of this specification, such as modified head geometry or special thread lengths that do not the requirements of section S1, are permitted when requested by the customer.