241 GB/T 1024-1976 角形外舌止动垫圈
Lock washers with angular upturn tab in line to the external tab
242 GB/T 1030-1988 内球面垫圈
Inner sphere washers
243 GB/T 1047-1995 管道元件的公称通径
Nominal size for pipe components
244 GB/T 1048-1990 管道元件公称压力
Nominal pressure for pipe components
245 GB/T 1095-1979 平键 键和键槽的剖面尺寸
Parallel keys--Dimensions of cross sections and keyways
246 GB/T 1096-1979 普通平键 型式尺寸
Plain parallel keys--Types and dimensions
247 GB/T 1097-1979 导向平键 型式尺寸
Feather keys--Types and dimensions
248 GB/T 1098-1979 半圆键 键和键槽的剖面尺寸
Semi-circular (Woodruff) keys--Dimensions of cross sections and keyways
249 GB/T 1099-1979 半圆键 型式尺寸
Woodruff keys--Types and dimensions
250 GB/T 1144-1987 矩形花键尺寸、公差和检验
Straight-sided spline—Dimensions tolerances and verification
251 GB/T 1168-1976 螺柱技术条件
Studs--Technical requirements
252 GB/T 1228-1991 钢结构用高强度大六角头螺栓
High strength bolts with large hexagon head for steel structures
253 GB/T 1229-1991 钢结构用高强度大六角螺母
High strength large hexagon nuts for steel structures
254 GB/T 1230-1991 钢结构用高强度垫圈
High strength plain washers for steel structures
255 GB/T 1231-1991 钢结构用高强度大六角头螺拴、大六角螺母、垫圈技术条件
Specifications of high strength bolts with large hexa-gon head, large hexagon nuts, plain washers for steel structures
256 GB/T 1237-1988 紧固件的标记方法
Designation system for fasteners
257 GB/T 1337-1988 六角自锁螺母
Self-locking nuts,hexagon
258 GB/T 1338-1988 小六角扁自锁螺母
Self-locking nuts,reduced hexagon oblate
259 GB/T 1339-1988 小六角自锁螺母
Self-locking nuts,reduced hexagon