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
317 gb/t 3289.8-1982 可锻铸铁管路连接件型式尺寸 45°月弯45°内外丝月弯45°外丝月弯 malleable cast iron pipe fittings——type size——long sweep bends 45°,male and female long sweep bends 45°,male long sweep bends 45°
318 gb/t 3289.9-1982 可锻铸铁管路连接件型式尺寸 u型弯头 malleable cast iron pipe fittings——type size——u-elbows(return bends)
319 gb/t 3289.10-1982 可锻铸铁管路连接件型式尺寸 三通 内外丝三通 malleable cast iron pipe fittings——type size——tees, male and female tees
320 gb/t 3289.11-1982 可锻铸铁管路连接件型式尺寸 异径内外丝三通 malleable cast iron pipe fittings——type size——male and female reducing tees
321 gb/t 3289.12-1982 可锻铸铁管路连接件型式尺寸 中大异径三通 malleable cast iron pipe fittings——type size——medium-large reducing tees
322 gb/t 3289.13-1982 可锻铸铁管路连接件型式尺寸 侧大异径三通 malleable cast iron pipe fittings——type size——lateral-large reducing tees
323 gb/t 3289.14-1982 可锻铸铁管路连接件型式尺寸 中小异径三通 malleable cast iron pipe fittings——type size——medium-less reducing tees
324 gb/t 3289.15-1982 可锻铸铁管路连接件型式尺寸 侧小异径三通 malleable cast iron pipe fittings——type size——lateral-less reducing tees
325 gb/t 3289.16-1982 可锻铸铁管路连接件型式尺寸 中小偏心异径三通 malleable cast iron pipe fittings——type size——medium-less eccentric reducing tees
326 gb/t 3289.17-1982 可锻铸铁管路连接件型式尺寸 45°三通 y型三通 malleable cast iron pipe fittings——type size——tees45°, y pieces(tees)
327 gb/t 3289.18-1982 可锻铸铁管路连接件型式尺寸 y型异径三通 malleable cast iron pipe fittings——type size——y piece reducing(tees)
328 gb/t 3289.19-1982 可锻铸铁管路连接件型式尺寸 侧孔三通 malleable cast iron pipe fittings——type size——side outlet tees
329 gb/t 3289.20-1982 可锻铸铁管路连接件型式尺寸 四通 malleable cast iron pipe fittings——type size——crosses
330 gb/t 3289.21-1982 可锻铸铁管路连接件型式尺寸 异径四通 malleable cast iron pipe fittings——type size——reducing crosses
331 gb/t 3289.22-1982 可锻铸铁管路连接件型式尺寸 外接头 内外丝接头 malleable cast iron pipe fittings——type size——male joints(sockets), male and female joints (sockets)
332 gb/t 3289.23-1982 可锻铸铁管路连接件型式尺寸 无方内接头 malleable cast iron pipe fittings——type size——no-square inner joint (nipples)
333 gb/t 3289.24-1982 可锻铸铁管路连接件型式尺寸 异径外接头 malleable cast iron pipe fittings——type size——reducing male joints (sockets)
334 gb/t 3289.25-1982 可锻铸铁管路连接件型式尺寸 偏心异径外接头 malleable cast iron pipe fittings——type size——eccentric reducing male joints (sockets)
335 gb/t 3289.26-1982 可锻铸铁管路连接件型式尺寸 内接头 malleable cast iron pipe fittings——type size——inner joints (nipples hexagon)
336 gb/t 3289.27-1982 可锻铸铁管路连接件型式尺寸 异径内接头 malleable cast iron pipe fittings——type size——reducing inner joints(nipples hexagon)
337 gb/t 3289.28-1982 可锻铸铁管路连接件型式尺寸 内外螺丝 malleable cast iron pipe fittings——type size——male and female screws (bushings)
338 gb/t 3289.29-1982 可锻铸铁管路连接件型式尺寸 通丝外接头 malleable cast iron pipe fittings——type size——through thread male joint (sockets)
339 gb/t 3289.30-1982 可锻铸铁管路连接件型式尺寸 锁紧螺母 malleable cast iron pipe fittings——type size——backnuts
340 gb/t 3289.31-1982 可锻铸铁管路连接件型式尺寸 外方管堵 malleable cast iron pipe fittings——type size——outer-square plugs
341 gb/t 3289.32-1982 可锻铸铁管路连接件型式尺寸 带边外方管堵 malleable cast iron pipe fittings——type size——outer-square beaded plugs
342 gb/t 3289.33-1982 可锻铸铁管路连接件型式尺寸 内方管堵 malleable cast iron pipe fittings——type size——inner-square plugs
343 gb/t 3289.34-1982 可锻铸铁管路连接件型式尺寸 管帽 malleable cast iron pipe fittings——type size——tube caps (caps plugs)
344 gb/t 3289.35-1982 可锻铸铁管路连接件型式尺寸 活接弯头 内外丝活接弯头 malleable cast iron pipe fittings——type size——union elbows, male and female union elbows
345 gb/t 3289.36-1982 可锻铸铁管路连接件型式尺寸 活接三通 malleable cast iron pipe fittings——type size——union tees
346 gb/t 3289.37-1982 可锻铸铁管路连接件型式尺寸 平形活接头 malleable cast iron pipe fittings——type size——parallel unions
347 gb/t 3289.38-1982 可锻铸铁管路连接件型式尺寸 锥形活接头 malleable cast iron pipe fittings——type size——taper unions
348 gb/t 3289.39-1982 可锻铸铁管路连接件型式尺寸 平形活接头垫圈 malleable cast iron pipe fittings——type size——parallel union gaskets
349 gb/t 3374-1992 齿轮基本术语 basic terminology of gears
350 gb/t 3478.1-1995 圆柱直齿渐开线花键模数 基本齿廓 公差 straight cylindrical involute splines——modules, basic rack profiles and tolerances