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General requirements for steel protruding-head bolts of tensile strength 1250 MPa (180000 lbf/in2) or greater. Specification Ingestion-build-209208 Fire safety notices are also1 Scope This British standard specifies the general requirements for metric and inch protruding head steel aerospace bolts of tensile strength of 1 250 MPa (180 000 lbf in2) or greater. The requirements related to nominal size are presented in individual tables Text deleted for use as appropriate to the relevant bolt specification. The values quoted for metric and inch bolts have a proportional relationship and are not direct conversions.