四方槽沉頭螺釘 (ASTM F837/F468) [TABLE 2.2.1-2 III] ASME B 18.6.3 (H1B-III) - 2024
| 選擇規格尺寸 點擊↓ 2# 3# 4# 5# 6# 8# 10# 12# 1/4 5/16 3/8 |
尺寸單位:
inch |
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![ASME B 18.6.3 (H1B-III) - 2024 四方槽沉頭螺釘 (ASTM F837/F468) [TABLE 2.2.1-2 III]](https://img.164580.com/upload/48/pic_cadpara/460_zh.png?ue=1751816176&local=cache&tp=canvas&pict=png)
![美標ASME B18.6.3 (H1B-III) - 2024 ASME18.6 四方槽沉頭螺釘 (ASTM F837/F468) [TABLE 2.2.1-2 III]](https://img.164580.com/upload/48/pic/2023/12/07/1701939524711725180.jpg)
![ASME B 18.6.3 (H1B-III) - 2024 四方槽沉頭螺釘 (ASTM F837/F468) [TABLE 2.2.1-2 III]](https://img.164580.com/upload/48/qrcode_standardurl/24908.png)
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| ①,頭部邊緣為倒圓或平的。 ②,小于等于長度L的螺釘，為清根沉頭型。 ③,機械螺釘的螺紋長度： 1）螺紋規格≤5#: 公稱長度≤3倍公稱直徑的應為滿扣產品，頭下螺紋肩距≤1倍螺距。 公稱長度＞3倍公稱直徑到 1-1/8 in 的，允許頭下肩距最大不超過2倍螺距。 若無其他規定，長螺釘的最小螺紋長度為1 in 。 2）螺紋規格≥6#: 公稱長度≤3倍公稱直徑的應為滿扣產品，頭下螺紋肩距≤1倍螺距。 公稱長度＞3倍公稱直徑到 2 in 的，允許頭下螺紋肩距最大不超過2倍螺距。 若無其他規定，長螺釘的最小螺紋長度為 1.5 in 。 ④,R代表正常插入深度，S代表短（淺）插入深度。 ⑤,方槽內壁略帶斜度。這個斜度會導致因鍍層在槽內的積聚而導致成品緊固件的插入深度測量受限。表中的凹槽插入尺寸適用于成品（鍍層）產品。制造商應注意，在生產過程中應為其留出必要的加工余量。 |
長度公差
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.
標稱螺釘尺寸的長度公差 | |||
標稱螺釘長度 | 螺紋規格 | ||
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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