Optional bending pins are available for some models of rebar flexure fixtures. Bending pins attach to the fixture's loading ram to bend the specimen at the appropriate diameter. A separate bending pin is required for each diameter of specimen. A wide variety of pins are available, depending on the model of fixture.The loading ram is attached to the adjustable crosshead and the appropriate bending pin is attached to the loading ram. The loading ram has spring steel clips or capturing washers on either side to retain the bending pin while still allowing it to swivel as the specimen is compressed. The clips/washers also allow for the pin to be changed easily when testing different diameter specimens.