Cite
MLA Citation
British Standards Institution,. Screws, pan head, internal offset cruciform ribbed or unribbed drive, threaded to head, metallic material, coated or uncoated, strength classes less than or equal to 1100 MPa. Dimensions.. London : British Standards Institution, 1998. http://access.bl.uk/ark:/81055/vdc_100104832156.0x000001