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 [tees(increasing on the branch)]

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

351 GB/T 3478.2-1995 圆柱直齿渐开线花键 30°压力角 尺寸表 Straight cylindrical involute splines--30°pressure angle dimenslons tables

352 GB/T 3478.3-1995 圆柱直齿渐开线花键 37.5°压力角 尺寸表 Straight cylindrical involute splines--37.5°pressure angle dimensions tables

353 GB/T 3478.4-1995 圆柱直齿渐开线花键 45°压力角 尺寸表 Straight cylindrical involute splines--45°pressure angle dimensions tables

354 GB/T 3478.5-1995 圆柱直齿渐开线花键 检验方法 Straight cylindrical involute splines--Inspection methods

355 GB/T 3478.6-1995 圆柱直齿渐开线花键 30°压力角 M值和W值 Straight cylindrical involute splines--30°pressurengle M and W values

356 GB/T 3478.7-1995 圆柱直齿渐开线花键 37.5°压力角 M值和W值 Straight cylindrical involute splines--37.5°pressure angle M and W values

357 GB/T 3478.8-1995 圆柱直齿渐开线花键 45°压力角 M值和W值 Straight cylindrical involute splines--45°pressure angle-M and W values

358 GB/T 3478.9-1995 圆柱直齿渐开线花键 量棒 Straight cylindrical involute splines--Measuring pin

359 GB/T 3507-1983 机械式联轴器公称扭矩系列 Nominal torque series of the mechanical coupling

360 GB/T 3632-1995 钢结构用扭剪型高强度螺栓连接副 Sets of torshear type high strength bolt hexagon nut and plain washer for steel structures

361 GB/T 3633-1995 钢结构用扭剪型高强度螺栓连接副 技术条件 Technical requirement for sets of torshear type high strength bolt hexagon nut and plain washer for steel structures

362 GB/T 3733.1-1983 卡套式端直通管接头 Straight thread connector--Assembly

363 GB/T 3733.2-1983 卡套式端直通接头体 Straight thread connector--Body

364 GB/T 3734.1-1983 卡套式锥螺纹直通管接头 Male connector--Assembly

365 GB/T 3734.2-1983 卡套式锥螺纹直通接头体 Male connector--Body

366 GB/T 3735.1-1983 卡套式端直通长管接头 Straight thread long connector--Assembly

367 GB/T 3735.2-1983 卡套式端直通长接头体 Straight thread long connector--Body

368 GB/T 3736.1-1983 卡套式锥螺纹长管接头 Male long connector--Assembly

369 GB/T 3736.2-1983 卡套式锥螺纹长接头体 Male long connector--Body

370 GB/T 3737.1-1983 卡套式直通管接头 Union--Assembly

371 GB/T 3737.2-1983 卡套式直通接头体 Union--Body

372 GB/T 3738.1-1983 卡套式端直角管接头 Straight thread elbow--Assembly

373 GB/T 3738.2-1983 卡套式端直角接头体 Straight thread elbow--Body

374 GB/T 3739.1-1983 卡套式锥螺纹直角管接头 Male elbow--Assembly

375 GB/T 3739.2-1983 卡套式锥螺纹直角接头体 Male elbow--Body

376 GB/T 3740.1-1983 卡套式直角管接头 Union elbow--Assembly

377 GB/T 3740.2-1983 卡套式直角接头体 Union elbow--Body

378 GB/T 3741.1-1983 卡套式端三通管接头 Straight thread branch tee--Assembly

379 GB/T 3741.2-1983 卡套式端三通接头体 Straight thread branch tee--Body

380 GB/T 3742.1-1983 卡套式锥螺纹三通管接头 Male branch tee-Assembly

381 GB/T 3742.2-1983 卡套式锥螺纹三通接头体 Male branch tee--body

382 GB/T 3743.1-1983 卡套式端直角三通管接头 Straight thread run tee--Assembly

383 GB/T 3743.2-1983 卡套式端直角三通接头体 Straight thread run tee--Body

384 GB/T 3744.1-1983 卡套式锥螺纹直角三通管接头 Male run tee--Assembly

385 GB/T 3744.2-1983 卡套式锥螺纹直角三通接头体 Male run tee--Body

386 GB/T 3745.1-1983 卡套式三通管接头 Union tee--Assembly

387 GB/T 3745.2-1983 卡套式三通接头体 Union tee--Body

388 GB/T 3746.1-1983 卡套式四通管接头 Union cross-Assembly

389 GB/T 3746.2-1983 卡套式四通接头体 Union cross--Body

390 GB/T 3747.1-1983 卡套式焊接管接头 Weld male connector-Assembly

391 GB/T 3747.2-1983 卡套式焊接接头体 Weld male connector--Body

392 GB/T 3748.1-1983 卡套式隔壁直通管接头 Bulkhead union--Assmbly

393 GB/T 3748.2-1983 卡套式隔壁直通接头体 Bulkhead union--Body

394 GB/T 3749.1-1983 卡套式隔壁直角管接头 Bulkhead union elbow--Assembly

395 GB/T 3749.2-1983 卡套式隔壁直角接头体 Bulkhead union elbow--Body

396 GB/T 3750.1-1983 卡套式铰接管接头 Angle swivel screw--Assembly

397 GB/T 3750.2-1983 卡套式铰接接头体 Angle swivel screw--Body

398 GB/T 3750.3-1983 卡套式铰接六角螺栓 Hollow screws

399 GB/T 3751.1-1983 卡套式压力表管接头 Connector for pressure gauge--Assembly

400 GB/T 3751.2-1983 卡套式压力表接头体 Connector for pressure gauge-Boby