BS 3A 125 to 3A 132, 3A 136 to 3A 143, 3A 147 to 3
航天器用系紧螺母(统一螺纹)规范

Specification for stiffnuts (Unified threads) for aircraft

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标准号

BS 3A 125 to 3A 132, 3A 136 to 3A 143, 3A 147 to 3

发布日期

1981年06月30日

实施日期

1981年06月30日

废止日期

无

中国标准分类号

V20

国际标准分类号

49.030.30

发布单位

GB-BSI

被代替标准

BS 2A 125 to 2A 132, 2A 136 to 2A 143, 2A 147 to 2A 168, 2A 180, 2A 181, 2A 192, 2A 193, 2A 186, 2A 187, 2A 200, 2A 201, A 213 to A 216-1958

适用范围

1 These British Standards cover the dimensions, material, finish, testing and identification of aircraft stiffnuts with Unified threads. According to the materials used in their construction, the stiffnuts are classified as satisfactory for use at sustained tempera-tures within the following ranges: (a) -75 ℃ to +425 ℃: corrosion-resisting steel nuts, silver plated or unplated (b) -75 ℃ to +200 ℃: steel and corrosion-resisting steel nuts, cadmium plated (c) -75 ℃ to +125 ℃: aluminium alloy, brass or bronze nuts. NOTE. All nuts are capable of remaining effective for servicing operations at -40 ℃. 2 Stiffnuts of the following types are covered by these British Standards: (a) hexagon nuts: ordinary, thin and cap (b) anchor nuts: (1) double-lug fixed: ordinary, thin and cap (2) double-lug floating: ordinary and thin (3) single-lug fixed: ordinary and thin (c) stripnuts floating: ordinary and thin. 3 In these standards, the nut bodies, whether of normal hexagon form or not, have a thread strength as least as great as the corresponding standard nuts.