無臺階防水螺柱
從材質上分為BB（碳鋼）和BBS（不銹鋼）兩種型號。
BB、BBS螺柱是在B、BS系列防水螺柱的基礎上的變型款，省去了B\BS螺柱的臺階，也因此而稱之為無臺階密封防水螺柱。
描述方法示例：
BB-M3-1-ZI:型號碳鋼無臺階防水螺柱，螺紋M3*0.5,規格M3-1，表面鍍鋅
| 螺紋*螺距 | 型號TYPE | 螺紋 代號 |
規格 代號 |
A Max |
最小 板厚 |
板孔徑 +0.08 |
C -0.1 |
E ±0.1 |
H Min |
T ±0.13 |
最小 邊距 |
|
| 碳鋼 | 不銹鋼 | |||||||||||
| M3*0.5 | BB | BBS | M3 | 1 | 0.97 | 1 | 4.25 | 4.22 | 6.35 | 5.3 | 10 | 4.8 |
| 2 | 1.38 | 1.4 | ||||||||||
| M4*0.7 | BB | BBS | M4 | 1 | 0.97 | 1 | 5.4 | 5.38 | 7.95 | 7.1 | 10 | 6.9 |
| 2 | 1.38 | 1.4 | ||||||||||
| M5*0.8 | BB | BBS | M5 | 1 | 0.97 | 1 | 6.4 | 6.38 | 8.75 | 7.1 | 10 | 7.1 |
| 2 | 1.38 | 1.4 | ||||||||||
| M6*1 | BB | BBS | M6 | 1 | 1.15 | 1.2 | 8.75 | 8.72 | 11.1 | 6.3 | 10 | 8.6 |
| 2 | 1.38 | 1.4 | ||||||||||
| 1 | 1.15 | 1.2 | 8.75 | 8.72 | 11.1 | 10 | 15 | 8.6 | ||||
| 2 | 1.38 | 1.4 | ||||||||||
| M8*1.25 | BB | BBS | M8 | 1 | 1.38 | 1.4 | 10.5 | 10.47 | 12.65 | 6 | 12 | 9.7 |
| 9 | 15 | |||||||||||
| 12 | 18 | |||||||||||
| 螺紋尺寸 | 型號TYPE | 螺紋 代號 |
規格 代號 |
A Max |
最小 板厚 |
板孔徑 +.003 |
C -.004 |
E ±.004 |
H Min |
T ±.004 |
最小 邊距 |
|
| 碳鋼 | 不銹鋼 | |||||||||||
| .112-40 (#4-40) |
BB | BBS | 440 | 1 | .038 | .040 | .166 | .165 | .25 | .21 | .38 | .19 |
| 2 | .054 | .056 | ||||||||||
| .138-32 ( #6-32) |
BB | BBS | 632 | 1 | .038 | .040 | .1875 | .187 | .28 | .23 | .38 | .22 |
| 2 | .054 | .056 | ||||||||||
| .164-32 (#8-32) |
BB | BBS | 832 | 1 | .038 | .040 | .213 | .212 | .31 | .28 | .44 | .27 |
| 2 | .054 | .056 | ||||||||||
| .190-32 (#10-32) |
BB | BBS | 032 | 1 | .038 | .040 | .250 | .249 | .34 | .28 | .44 | .28 |
| 2 | .054 | .056 | ||||||||||
| .250-20 (1/4-20) |
BB | BBS | 0420 | 1 | .054 | .056 | .344 | .343 | .43 | .31 | .56 | .34 |
| 2 | .087 | .090 | ||||||||||
| .313-18 (5/16-18) |
BB | BBS | 0518 | 1 | .054 | .056 | .413 | .412 | .50 | .36 | .61 | .38 |
| 2 | .087 | .090 | ||||||||||
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