中华人民共和国国家标准塑料窗基本尺寸公差（节录）
GB 12003—89
3 检测量具
用钢卷尺和钢直尺，在钢卷尺和钢直尺起始100mmm内，尺面应有0．5最小分度刻线。尺上应标明制造厂名（或商标）及最小分度值，数字、文字、线纹均应清晰均匀，使用中的钢卷尺、钢直尺不能有影响使用精度的缺陷。
4 抽样方法
按每项工程的品种、规格抽检5%，但不少于三档，当其中有一档不符合标准尺寸公差要求时，要批窗应全部复检，复检全格后方可出厂。仲裁时，按照GB 2828进行抽样检验。
5 公差和精度
公差精度见表1和表2
      表1   窗高和窗宽的尺寸公差       mm               表2   窗对角线尺寸公差    mm
精度等级
 窗 尺 寸 公 差  精度等级 对 角 线 尺 寸 公 差
 300~900 910~1500 1501~2000 >2000   <1000 1001~2000 >2000
一 ±1.5 ±1.5 ±2 ±2.5  一 ±2 ±3 ±4
二 ±1.5 ±2 ±2.5 ±3  二 ±3 ±3.5 ±5
三 ±2 ±2.5 ±3 ±4  三 ±3.5 ±4 ±6

6．检测方法
The People's Republic of China national standard of basic tolerance plastic window (excerpt)
GB 12003-89
3 Detection Measure
Steel tape and steel ruler, steel tape and steel ruler at the start 100mmm, the surface should be 0.5 feet minimum indexing groove. Ruler should be marked with manufacturer name (or trademark) and the Minimum Scale, digital, text, lined should be clear and uniform, the use of steel tape, steel ruler can not affect the use of precision defects.
4 sampling
According to each project type, specifications sampling of 5%, but not less than third gear, when one has a file does not meet standard tolerance requirements, the window should be granted all the recheck, only after the whole cell factory. Arbitration, in accordance with the GB 2828 sample test.
5 tolerances and precision
Precision tolerances in Table 1 and Table 2
      Table 1 window height and window width of the window of tolerance mm Table 2 mm diagonal dimension tolerance
Accuracy class
 Diagonal window size tolerance tolerance precision grade
 300 ~ 900 910 ~ 1500 1501 2000> 2000 <10001001 ~ 2000> 2000
1 ± 1.5 ± 1.5 ± 2 ± 2.5 1 ± 2 ± 3 ± 4
2 ± 1.5 ± 2 ± 2.5 ± 3 2 ± 3 ± 3.5 ± 5
3 ± 2 ± 2.5 ± 3 ± 4 3 ± 3.5 ± 4 ± 6

6. Detection