The beta titanium alloy Ti-15V-3Cr-3Al-3Sn (Ti15-3) holds promise as a fastener material due to its high strength, excellent hardenability and formability. An important requirement for fastener applications is resistance to environment-assisted degradation (EAD). Slow strain rate testing was carried out to evaluate resistance to EAD of unaged and aged Ti15- 3; testing was also carried out on titanium alloy Ti-6Al-4V (Ti6-4), a frequently used fastener material, for the sake of comparison. Results indicate that Ti15-3 shows superior performance to Ti6-4 and hence better candidate material from the EAD point of view. © 2014, Sphinx Knowledge House. All rights reserved.