BS 2A 254 to 2A 259:2019

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

Published By	Publication Date	Number of Pages
BSI	2019	18

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Categories: 49.030.20 - Bolts, screws, studs, BSI

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Description

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 00-970 Pt.1/14 Section 4 Leaflet 8 which recommends certain limitations on their use.

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Additional information

Status	Confirmed
Pages	18
Publication Date	2019-09-30
ISBN	978 0 539 00895 1
Standard Number	BS 2A 254 to 2A 259:2019
Title	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
Replaces	BS A 254; A 255 […]:1976
Descriptors	UNJ screw threads, Close-fit threads, Air transport engineering, External-thread fasteners, Designations, Bolts, Threaded components, Hexagonal-head fasteners, Aircraft components, Anodizing, Protective coatings, Fasteners, Marking, Titanium alloys, Corrosion-resistant materials, Threaded fasteners, Dimensions
Publisher	BSI
Committee	ACE/12
ICS Codes	49.030.20 - Bolts, screws, studs

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BS 2A 254 to 2A 259:2019

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