GB/T 48251-2026Aerospace fluid systems - Plastic protective caps and plugs - Dimensions (English PDF)

GB/T 48251-2026 is the English-translated version of 航空航天流体系统 塑料防护帽和防护螺塞 尺寸.

Protective caps and plugs keep contamination out of fluid connections on aircraft and spacecraft, and this standard gives the dimensions of plastic protective caps and plugs for aerospace fluid systems. It will be used by manufacturers of fittings and hydraulic or fuel components, suppliers of protective accessories, aircraft assembly and maintenance organisations, and procurement staff who need parts that are interchangeable between suppliers.

A dimensional standard of this kind simplifies drawings and purchasing, since a part can be called up by reference instead of being described afresh on each project. It adopts an international standard. The document was issued on 28 September 2026 and takes effect on 1 April 2027. As a recommended national standard, it is applied through drawings, contracts or company specifications. Maintenance teams will also value it, because caps and plugs are fitted whenever a line is opened, and a common size range means that spares can be stocked and exchanged between programmes without adaptation.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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