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301 GB/T 3103.2-1982 緊固件公差 用于精密機械的螺栓、螺釘和螺母 Tolerances for fasteners--Bolts, screws and nuts for fine mechanics
302 GB/T 3103.3-1982 緊固件公差 平墊圈 Tolerances for fasteners--Washers
303 GB/T 3103.4-1992 緊固件公差 耐熱用螺紋連接副 Tolerances for fasteners--Components for bolted connections made mainly from materials with a high temperature strength
304 GB/T 3104-1982 緊固件 六角產品的對邊寬度 Fasteners--Widths across flats of hexagon products
305 GB/T 3105-1982 螺栓和螺釘的頭下圓角半徑 Radii under the head of bolts and screws
306 GB/T 3106-1982 螺栓、螺釘和螺柱的公稱長度和普通螺栓的螺紋長度 Bolts, screws and studs--Nominal lengths, and thread lengths for general purpose bolts
307 GB/T 3162-1991 滑動軸承薄壁軸瓦尺寸、結構要素與公差 Plain bearings—Thin-walled bearing shells—Dimensions, structure elements and tolerances
308 GB/T 3287-1982 可鍛鑄鐵管路連接件技術條件 Technical requirements of malleable cast iron pipe fittings
309 GB/T 3288-1982 可鍛鑄鐵管路連接件驗收規(guī)則 Delivery requirements of malleable cast iron pipe fittings
310 GB/T 3289.1-1982 可鍛鑄鐵管路連接件型式尺寸 管件結構尺寸表 Malleable cast iron pipe fittings--Type size--Dimensions list of pipe fittings structure
311 GB/T 3289.2-1982 可鍛鑄鐵管路連接件型式尺寸 彎頭 內外絲彎頭 Malleable cast iron pipe fittings--Type size--Elbows male and female elbows
312 GB/T 3289.3-1982 可鍛鑄鐵管路連接件型式尺寸 45°彎頭 45°內外絲彎頭 Malleable cast iron pipe fittings--Type size--Elbows 45°, male and female elbows 45°
313 GB/T 3289.4-1982 可鍛鑄鐵管路連接件型式尺寸 異徑彎頭 Malleable cast iron pipe fittings--Type size--Reducing elbows
314 GB/T 3289.5-1982 可鍛鑄鐵管路連接件型式尺寸 異徑內外絲彎頭 Malleable cast iron pipe fittings--Type size--Male and female reducing elbows
315 GB/T 3289.6-1982 可鍛鑄鐵管路連接件型式尺寸 側孔彎頭 Malleable cast iron pipe fittings--Type size--Side outlet elbows
316 GB/T 3289.7-1982 可鍛鑄鐵管路連接件型式尺寸 月彎 內外絲月彎 外絲月彎 Malleable cast iron pipe fittings--Type size--Return bends, male and female return bends, thread return bends
317 GB/T 3289.8-1982 可鍛鑄鐵管路連接件型式尺寸 45°月彎45°內外絲月彎45°外絲月彎 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 可鍛鑄鐵管路連接件型式尺寸 U型彎頭 Malleable cast iron pipe fittings--Type size--U-Elbows(return bends)
319 GB/T 3289.10-1982 可鍛鑄鐵管路連接件型式尺寸 三通 內外絲三通 Malleable cast iron pipe fittings--Type size--Tees, male and female tees
320 GB/T 3289.11-1982 可鍛鑄鐵管路連接件型式尺寸 異徑內外絲三通 Malleable cast iron pipe fittings--Type size--Male and female reducing tees
321 GB/T 3289.12-1982 可鍛鑄鐵管路連接件型式尺寸 中大異徑三通 Malleable cast iron pipe fittings--Type size--Medium-large reducing tees [tees(increasing on the branch)]
322 GB/T 3289.13-1982 可鍛鑄鐵管路連接件型式尺寸 側大異徑三通 Malleable cast iron pipe fittings--Type size--Lateral-large reducing tees
323 GB/T 3289.14-1982 可鍛鑄鐵管路連接件型式尺寸 中小異徑三通 Malleable cast iron pipe fittings--Type size--Medium-less reducing tees
324 GB/T 3289.15-1982 可鍛鑄鐵管路連接件型式尺寸 側小異徑三通 Malleable cast iron pipe fittings--Type size--Lateral-less reducing tees
325 GB/T 3289.16-1982 可鍛鑄鐵管路連接件型式尺寸 中小偏心異徑三通 Malleable cast iron pipe fittings--Type size--Medium-less eccentric reducing tees
326 GB/T 3289.17-1982 可鍛鑄鐵管路連接件型式尺寸 45°三通 Y型三通 Malleable cast iron pipe fittings--Type size--Tees45°, Y pieces(tees)
327 GB/T 3289.18-1982 可鍛鑄鐵管路連接件型式尺寸 Y型異徑三通 Malleable cast iron pipe fittings--Type size--Y Piece reducing(tees)
328 GB/T 3289.19-1982 可鍛鑄鐵管路連接件型式尺寸 側孔三通 Malleable cast iron pipe fittings--Type size--Side outlet tees
329 GB/T 3289.20-1982 可鍛鑄鐵管路連接件型式尺寸 四通 Malleable cast iron pipe fittings--Type size--Crosses
330 GB/T 3289.21-1982 可鍛鑄鐵管路連接件型式尺寸 異徑四通 Malleable cast iron pipe fittings--Type size--Reducing crosses
331 GB/T 3289.22-1982 可鍛鑄鐵管路連接件型式尺寸 外接頭 內外絲接頭 Malleable cast iron pipe fittings--Type size--Male joints(sockets), male and female joints (sockets)
332 GB/T 3289.23-1982 可鍛鑄鐵管路連接件型式尺寸 無方內接頭 Malleable cast iron pipe fittings--Type size--No-square inner joint (nipples)
333 GB/T 3289.24-1982 可鍛鑄鐵管路連接件型式尺寸 異徑外接頭 Malleable cast iron pipe fittings--Type size--Reducing male joints (sockets)
334 GB/T 3289.25-1982 可鍛鑄鐵管路連接件型式尺寸 偏心異徑外接頭 Malleable cast iron pipe fittings--Type size--Eccentric reducing male joints (sockets)
335 GB/T 3289.26-1982 可鍛鑄鐵管路連接件型式尺寸 內接頭 Malleable cast iron pipe fittings--Type size--Inner joints (nipples hexagon)
336 GB/T 3289.27-1982 可鍛鑄鐵管路連接件型式尺寸 異徑內接頭 Malleable cast iron pipe fittings--Type size--Reducing inner joints(nipples hexagon)
337 GB/T 3289.28-1982 可鍛鑄鐵管路連接件型式尺寸 內外螺絲 Malleable cast iron pipe fittings--Type size--Male and female screws (bushings)
338 GB/T 3289.29-1982 可鍛鑄鐵管路連接件型式尺寸 通絲外接頭 Malleable cast iron pipe fittings--Type size--Through thread male joint (sockets)
339 GB/T 3289.30-1982 可鍛鑄鐵管路連接件型式尺寸 鎖緊螺母 Malleable cast iron pipe fittings--Type size--Backnuts
340 GB/T 3289.31-1982 可鍛鑄鐵管路連接件型式尺寸 外方管堵 Malleable cast iron pipe fittings--Type size--Outer-square plugs

341 GB/T 3289.32-1982 可鍛鑄鐵管路連接件型式尺寸 帶邊外方管堵 Malleable cast iron pipe fittings--Type size--Outer-square beaded plugs
342 GB/T 3289.33-1982 可鍛鑄鐵管路連接件型式尺寸 內方管堵 Malleable cast iron pipe fittings--Type size--Inner-square plugs
343 GB/T 3289.34-1982 可鍛鑄鐵管路連接件型式尺寸 管帽 Malleable cast iron pipe fittings--Type size--Tube caps (caps plugs)
344 GB/T 3289.35-1982 可鍛鑄鐵管路連接件型式尺寸 活接彎頭 內外絲活接彎頭 Malleable cast iron pipe fittings--Type size--Union elbows, male and female union elbows
345 GB/T 3289.36-1982 可鍛鑄鐵管路連接件型式尺寸 活接三通 Malleable cast iron pipe fittings--Type size--Union tees
346 GB/T 3289.37-1982 可鍛鑄鐵管路連接件型式尺寸 平形活接頭 Malleable cast iron pipe fittings--Type size--Parallel unions
347 GB/T 3289.38-1982 可鍛鑄鐵管路連接件型式尺寸 錐形活接頭 Malleable cast iron pipe fittings--Type size--Taper unions
348 GB/T 3289.39-1982 可鍛鑄鐵管路連接件型式尺寸 平形活接頭墊圈 Malleable cast iron pipe fittings--Type size--Parallel union gaskets
349 GB/T 3374-1992 齒輪基本術語 Basic terminology of gears
350 GB/T 3478.1-1995 圓柱直齒漸開線花鍵模數 基本齒廓 公差 Straight cylindrical involute splines--Modules, basic rack profiles and tolerances