Bolts, hexagonal head, close tolerance shank, UNJF threads, split pin & locking wire hole options, titanium alloy, various finishes. Classification: Rm 1 100-1 250 MPa (160 000-180 000 lbf/in2) at Ambient Temperature | +315°C

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

30-09-2019

Publisher

British Standards Institution

This British Standard specifies the materials, dimensions, finish and inspection requirements for titanium alloy bolts with hexagonal heads and UNJ thread for aerospace use.

CAUTION. BS A 257 bolts have cadmium as a plating material which has been restricted and/or banned for use in many countries owing to environmental and health concerns; they should not be used in new product designs. Local officials should be consulted about any concerns on the use of cadmium-plated parts. In addition, cadmium plating on titanium parts has been documented to result in stress corrosion and also solid metal embrittlement (SME) when exposed to relatively low temperatures. Accordingly, BS A 258 has been introduced as a replacement.

When considering the use of cadmium plated titanium bolts, attention is drawn to Def Stan 00-970Pt.1/14 Section4 Leaflet 8 which recommends certain limitations on their use.

Committee	ACE/12
DocumentType	Standard
ISBN	9780539008951
Pages	18
ProductNote	BS A 242-245, BS A 346, BS TA 28, DEF STAN 91/19/1, BS M 58, SAE ITC RS678, BS A 101, DARD Technical Circular No. 292, ASD-STAN prEN 6117, ASD-STAN prEN 6118
PublisherName	British Standards Institution
Status	Current
Supersedes	BS A 254; A 255 [...]:1976