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1.1 This specification covers two types and two grades of seven-wire, uncoated steel strand for use in pretensioned and post-tensioned prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation strand shall be regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless specifically ordered, or by arrangement between purchaser and supplier. Grade 250  and Grade 270  have minimum ultimate strengths of 250000 psi [1725 MPa] and 270000 psi [1860 MPa], respectively, based on the nominal area of the strand.
1.2 The values stated in either inch-pound units or SI units are to be regarded as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A981/A981M Test Method for Evaluating Bond Strength for 0.600-in. [15.24-mm] Diameter Steel Prestressing Strand, Grade 270 , Uncoated, Used in Prestressed Ground Anchors
A1061/A1061M Test Methods for Testing Multi-Wire Steel Strand
U.S. Military StandardsMIL-STD-129 Marking for Shipment and Storage
U.S. Federal StandardFed.Std.No.123 Marking for Shipments (Civil Agencies)
ICS Number Code 77.140.15 (Steels for reinforcement of concrete)
UNSPSC Code 31152207(Prestressed concrete steel wire)