260 GB/T 1340-1988 成组游动托板自锁螺母支架
Supports for self-locking nuts,anchor floating,Gang channel
261 GB/T 1356-1988 淅开线圆柱齿轮 基本齿廓
Basic rack tooth profile of involute cylindrical gears
262 GB/T 1357-1987 渐开线圆柱齿轮模数
Modules of involute cyindrical gears
263 GB/T 1563-1979 楔键 键和键槽的剖面尺寸
Taper keys--Cross section dimensions of keys and keyways
264 GB/T 1564-1979 普通楔键 型式尺寸
Taper keys for general use--Types and dimensions
265 GB/T 1565-1979 钩头楔键 型式尺寸
Gib-head taper keys--Types and dimensions
266 GB/T 1566-1979 薄型平键 键和键槽的剖面尺寸
Thin flat keys--Cross section dimensions and keyways
267 GB/T 1567-1979 薄型平键 型式尺寸
Thin flat keys--Types and dimensions
268 GB/T 1840-1989 圆弧圆柱齿轮模数
Modules of cylindrical gear with circular arc profiles
269 GB/T 1974-1980 切向键及其键槽
Tangential keys and keyways
270 GB/T 2362-1990 小模数渐开线圆柱齿轮基本齿廓
Basic rack tooth profile of fine-pitch involute cylindrical gears
271 GB/T 2363-1990 小模数渐开线圆柱齿轮精度
Accuracy of fine-pitch involute cylindrical gears
272 GB/T 2509-1981 滑动轴承铜合金整体轴套形式、尺寸与公差
Copper alloy integrated shaft sleeves for plain bearings--Types, dimensions and tolerances
273 GB/T 2510-1981 滑动轴承铜合金带挡边整体轴套形式、尺寸与公差
Copper alloy integrated shaft sleeves for plain bearings with gears--Types, dimensions and tolerances
274 GB/T 2511-1981 滑动轴承铜合金整体轴套技术条件
Copper alloy integrated shaft sleeves--Technical requirements
275 GB/T 2555-1981 一般用途管法兰连接尺寸
Pipe flange connectors for ordinary use--Mounting dimensions
276 GB/T 2556-1981 一般用途管法兰密封面形状和尺寸
Pipe flanges for ordinary use--Sealing surfaces--Forms and dimensions