301 GB/T 3103.2-1982 紧固件公差 用于精密机械的螺栓、螺钉和螺母 Tolerances for fasteners--Bolts, screws and nuts for fine mechanics
302 GB/T 3103.3-1982 紧固件公差 平垫圈 Tolerances for fasteners--Washers
303 GB/T 3103.4-1992 紧固件公差 耐热用螺纹连接副 Tolerances for fasteners--Components for bolted connections made mainly from materials with a high temperature strength
304 GB/T 3104-1982 紧固件 六角产品的对边宽度 Fasteners--Widths across flats of hexagon products
305 GB/T 3105-1982 螺栓和螺钉的头下圆角半径 Radii under the head of bolts and screws
306 GB/T 3106-1982 螺栓、螺钉和螺柱的公称长度和普通螺栓的螺纹长度 Bolts, screws and studs--Nominal lengths, and thread lengths for general purpose bolts
307 GB/T 3162-1991 滑动轴承薄壁轴瓦尺寸、结构要素与公差 Plain bearings—Thin-walled bearing shells—Dimensions, structure elements and tolerances
308 GB/T 3287-1982 可锻铸铁管路连接件技术条件 Technical requirements of malleable cast iron pipe fittings
309 GB/T 3288-1982 可锻铸铁管路连接件验收规则 Delivery requirements of malleable cast iron pipe fittings
310 GB/T 3289.1-1982 可锻铸铁管路连接件型式尺寸 管件结构尺寸表 Malleable cast iron pipe fittings--Type size--Dimensions list of pipe fittings structure
311 GB/T 3289.2-1982 可锻铸铁管路连接件型式尺寸 弯头 内外丝弯头 Malleable cast iron pipe fittings--Type size--Elbows male and female elbows
312 GB/T 3289.3-1982 可锻铸铁管路连接件型式尺寸 45°弯头 45°内外丝弯头 Malleable cast iron pipe fittings--Type size--Elbows 45°, male and female elbows 45°
313 GB/T 3289.4-1982 可锻铸铁管路连接件型式尺寸 异径弯头 Malleable cast iron pipe fittings--Type size--Reducing elbows
314 GB/T 3289.5-1982 可锻铸铁管路连接件型式尺寸 异径内外丝弯头 Malleable cast iron pipe fittings--Type size--Male and female reducing elbows
315 GB/T 3289.6-1982 可锻铸铁管路连接件型式尺寸 侧孔弯头 Malleable cast iron pipe fittings--Type size--Side outlet elbows
316 GB/T 3289.7-1982 可锻铸铁管路连接件型式尺寸 月弯 内外丝月弯 外丝月弯 Malleable cast iron pipe fittings--Type size--Return bends, male and female return bends, thread return bends