AASHTO M 275M/M 275-20涵盖了用于先张和后张预应力混凝土施工或预应力地锚的无涂层高强度钢筋。钢筋的最低极限抗拉强度水平为1035 MPa[150000 psi]。提供两种类型的钢筋:I型钢筋具有平面，II型钢筋具有表面变形。

AASHTO M 275M/M 275-20 covers uncoated high-strength steel bars intended for use in pretensioned and post-tensioned prestressed concrete construction or in prestressed ground anchors. Bars are of a minimum ultimate tensile strength level of 1035 MPa [150000 psi].Two types of bars are provided: Type I bar has a plain surface and Type II bar has surface deformations.