BS A 303:1994 download.Bolts, normal bihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1100 MPa Dimensions.
1 Scope
BS A 303 specifies the dimensions of normal bihexagonal head bolts, with close or large tolerance normal shank, and short or medium length MJ threads, in metallic material, coated or uncoated. with strength classes less than or equal to 1 100 Ml’s.
It is intended for the drawing up of aerospace product standards.
2 Normative references
The following standards contain provisions which. through reference in this text, constitute provisions of BS A 303. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on BS A 303 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 286-2:1988, ISO system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts.
ISO 3353:1992. Aerospace — Rolled threads for bolts — Lead and rufouS requirements.
ISO 4095:1978, Fasteners for aerospace construction — Bi-hexagonal wrenching configuration.
ISO 5855-2:1988, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts.
3 Configuration and dimensions
See Figure 1 and Table 1. I)imensions and tolerances are expressed in millimetres. They are applicable after any surface coating, but before the application of any lubricant.