BS 3A 210:2019 Aerospace series – Nuts, hexagonal, ordinary and thin, Unified threads (below .250 inch), brass, tin plated – Specification.
This British Standard specifies the matenals. dimensions. llntsh and inspection requirements for tin-plated brass nuts wtth Unitlcd hesaguni. and Unified threads or aircralL It makes provision for ranges of ordinary and thin nuts.
2 NormatIve references
The (ollowing documents, In whole or in part. are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated relerencrs. the latest edition of the referenced document (Including any amendments) applies.
KS 1B72. ftcotion far efrctropiufed coatings o(tin
KS 4A 100. Aeroipme series — Spec4kotion for gent’nd revquia-r’.wntsfrsr bolts und free running flub oil tsnslk strength nut ear etdurg 1249 MPo
KS IN 12163. Copper and copper aUuy — R4far genenrl purposes
KS EN 12164, Copper and copper alloys — Rod far free mod,inrrtq purposes
KS EN 12167, Copper and copper alloys — Plsi1ks and bars for general purpose
3 Terms and definItions
No teems and definitions are listed in this document.
4 General requirements
The nuts shall conform to the relevant requirements or 115 4A 100. In respect of manufacture, screw threads, identification and marking.
S Material and manufacture
5.1 The nuts shall be ,nachined from free machining leaded brass bar Hi accordance with ItS EN 12163. KSIN 12164orBSlN l2I67alloyCW6I4N-K430.
52 a law bee., withéuwi, but are si,cluded hare for rsfre..ceonêjbr nun mochiie.dfrum free anuuonØ ?eaád bram bor th am P13-H. wfoc* mWkt tiiJ be Sn se.i*
52 To maintain visu.d identification of a nuts thread end with the on-countersunk face. deburring using a suitable barrelling method shall he the acceptable method to keep metal remousi to a minimum. The sharp thread break-out shall not he deburred using hand or machine tools which use a cutting blade.
5.3 The nuts shall be configured in accordance with:
a) Fisurci. for Ordinaiy Nuts; or
b) Figure 2. for Thin Nuts.BS 3A 210 pdf download.