ASTM International

Standard Specification for Headed Steel Bars for Concrete Reinforcement
 N A970/A970M

Annotation

This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut from plate. Attachment can be accomplished through:

Welding;

Integrally hot forging of a head from the reinforcing bar end;

Internal threads in the head mating to threads on the bar end;

Cold-swaging an externally threaded coupling sleeve onto the reinforcing bar;

Cold-extruding an external coupling sleeve onto the reinforcing bar;

Cold-swaging an external coupling sleeve or headed sleeve onto the reinforcing bar;

Attaching a coupling sleeve to the end of the reinforcing bar by means of the means of a ferrous-filler medium; or

Separate threaded nut to secure the head to the bar.

NOTE 1—The requirements of this specification are only applicable to headed bars where the attachment of the head is accomplished by one of the methods listed in 1.1.

Limitations on head dimensions and on obstructions and interruptions of bar deformations on the non-planar features on the bearing face of the head are presented in Annex A1. The requirements in Annex A1 only apply when specified by the purchaser (see 4.2.3).

This specification is applicable for orders in either inch-pound units as Specification A970 or SI units as Specification A970M.