277 GB/T 2672-1986 内六角花形盘头螺钉
Hexagon lobular socket pan head screws
278 GB/T 2673-1986 内六角花形沉头螺钉
Hexagon lobular socket countersunk head screws
279 GB/T 2674-1986 内六角花形半沉头螺钉
Hexagon lobular socket raised countersunk head screws
280 GB/T 2685-1981 滑动轴承 粉末冶金筒形轴承型式、尺寸与公差
Powder metallurgy plain bearing--Cylindrical type--Types, dimensions and tolerances
281 GB/T 2686-1981 滑动轴承 粉末冶金带挡边筒形轴承型式、尺寸与公差
Powder metallurgy plain bearing--Rimed cylindrical type--Types, dimensions and tolerances
282 GB/T 2687-1981 滑动轴承 粉末冶金球形轴承型式、尺寸与公差
Powder metallurgy plain bearing--Spherical type--Types, dimensions and tolerances
283 GB/T 2688-1981 滑动轴承 粉末冶金轴承技术条件
Powder metallurgy plain bearing--Technical requirements
284 GB/T 2821-1992 齿轮几何要素代号
Symbols for gear geometrical data
285 GB/T 2889-1994 滑动轴承 术语
Plain bearings--Terms, definitions and classification
286 GB/T 3098.1-1982 紧固件机械性能 螺栓、螺钉和螺柱
Mechanical properties of fasteners--Bolts, screws and studs
287 GB/T 3098.2-1982 紧固件机械性能 螺母
Mechanical properties of fasteners--Nuts
288 GB/T 3098.3-1982 紧固件机械性能 紧定螺钉
Mechanical properties of fasteners--Set screws
289 GB/T 3098.4-1986 紧固件机械性能--细牙螺母
Mechanical properties of fasteners--Nuts with fine pitch thread
290 GB/T 3098.5-1985 紧固件机械性能 自攻螺钉
Mechanical properties of fasteners--Tapping screws
291 GB/T 3098.6-1986 紧固件机械性能 不锈钢螺栓, 螺钉, 螺柱和螺母
Mechanical properties of fasteners--Stainless steel bolts,screws, studs and nuts
292 GB/T 3098.7-1986 紧固件机械性能 自攻锁紧螺钉 粗牙普通螺纹系列
Mechanical properties of fasteners--Thread forming screws--Metric coarse thread series
293 GB/T 3098.8-1992 紧固件机械性能 耐热用螺纹连接副