四方槽沉头螺钉 (ASTM F837/F468) [TABLE 2.2.1-2 III] ASME B 18.6.3 (H1B-III) - 2024
| 选择规格尺寸 点击↓ 2# 3# 4# 5# 6# 8# 10# 12# 1/4 5/16 3/8 |
尺寸单位:
inch |
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![ASME B 18.6.3 (H1B-III) - 2024 四方槽沉头螺钉 (ASTM F837/F468) [TABLE 2.2.1-2 III]](https://img.164580.com/upload/48/pic_cadpara/460_zh.png?ue=1734859940&local=cache&tp=canvas&pict=png)
![美标ASME B18.6.3 (H1B-III) - 2024 ASME18.6 四方槽沉头螺钉 (ASTM F837/F468) [TABLE 2.2.1-2 III]](https://img.164580.com/upload/48/pic/2023/12/07/1701939524711725180.jpg)
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| ①,头部边缘为倒圆或平的。 ②,小于等于长度L的螺钉，为清根沉头型。 ③,机械螺钉的螺纹长度： 1）螺纹规格≤5#: 公称长度≤3倍公称直径的应为满扣产品，头下螺纹肩距≤1倍螺距。 公称长度＞3倍公称直径到 1-1/8 in 的，允许头下肩距最大不超过2倍螺距。 若无其他规定，长螺钉的最小螺纹长度为1 in 。 2）螺纹规格≥6#: 公称长度≤3倍公称直径的应为满扣产品，头下螺纹肩距≤1倍螺距。 公称长度＞3倍公称直径到 2 in 的，允许头下螺纹肩距最大不超过2倍螺距。 若无其他规定，长螺钉的最小螺纹长度为 1.5 in 。 ④,R代表正常插入深度，S代表短（浅）插入深度。 ⑤,方槽内壁略带斜度。这个斜度会导致因镀层在槽内的积聚而导致成品紧固件的插入深度测量受限。表中的凹槽插入尺寸适用于成品（镀层）产品。制造商应注意，在生产过程中应为其留出必要的加工余量。 |
长度公差
Machine screws can be made to any length, but they are generally produced in fractional length increments of 1/16 in. for screws up to 5/8 in. long, 1/8 in. for screws over 5/8 in. through 1-1/2 in. long, and 1/4 in. for screws over 1-1/2 in. long.
标称螺钉尺寸的长度公差 | |||
标称螺钉长度 | 螺纹规格 | ||
0000~00 | 0~12 | 1/4~3/4 | |
≤1/2 | -0.01 | -0.02 | -0.03 |
＞1/2,≤1 | -0.02 | -0.03 | -0.03 |
＞1,≤2 | / | -0.06 | -0.06 |
＞2 | / | -0.09 | -0.09 |
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