All Carnegie Library of Pittsburgh locations will be closed on Wednesday, December 24, Thursday, December 25 and Thursday, January 1, 2015. In addition, the Library will close at
5 pm Wednesday, December 31, 2014.
BSI Standards List
BS 6SP 4
Pins headed, plain shank, drilled, steel alloy and corrosion resisting steel with a strength class 880 / 1 080 MPa