不锈钢钢丝螺套（也称为螺纹护套、钢丝护套、螺纹丝套、牙套、螺纹衬套、不锈钢螺套等）是一种由高精度的菱形不锈钢丝精制成形的螺旋线圈，为高精度内外螺纹同心体的新型内螺纹紧固件。
一、钢丝螺套的标记方法
不锈钢钢丝螺套标记方法主要有两种形式，分别是规格法和标准法，螺纹护套钢丝螺套标记方法实际上表达的就是钢丝螺套的直径、螺距和长度三个参数。此处的直径和长度指的是安装后的内螺纹直径和安装后形成的实际螺纹长度。
1 规格法：
① FR( 普通型 ) MD （直径）× P （螺距） -nD ( 直径 )
② SL( 锁紧型 ) MD （直径）× P （螺距） -nD ( 直径 )
2 标准法：
D( 直径 ) × P( 螺距 ) × N( 自由状态下钢丝螺套圈数 )
二、钢丝螺套的规格参数表
应该如何选用不锈钢钢丝螺套呢？不锈钢钢丝螺套在选用时可根据相应的规格型号参数进行选择，用户可以对照钢丝螺套规格参数表进行正确的选用到合适的产品。钢丝螺套、螺纹护套的规格参数有公制和英制两种尺寸参数。
钢丝螺套、螺纹护套的规格参数有公制和英制两种，这两种参数表如下：
符号说明：
d--钢丝螺套公称直径（螺钉公称直径） L—钢丝螺套公称长度（安装后的螺纹长度） P--螺距
do--钻丝套安装用钻头直径 Dz--钢丝螺套自由状态下外径 N--钢丝螺套自由状态下圈数
1、公制钢丝螺套规格、螺纹护套规格参数表
|
公制不锈钢钢丝螺套规格参数 |
|||||
|
螺纹规格d×p |
k×d |
钢丝螺套安装后长度L(mm) |
钻头直径do(mm) |
自由状态下外径Dz(mm) |
自由状态螺套圈数N(≈) |
|
M2×0.4 |
1d |
2 |
2 |
2.6-2.8 |
2.9 |
|
M2.5×0.45 |
1d |
2.5 |
2.6 |
3.3-3.5 |
3.5 |
|
M3×0.5 |
1d |
3 |
3.1 |
3.8-4.0 |
4 |
|
M4×0.7 |
1d |
4 |
4.1 |
5.15-5.35 |
3.7 |
|
M5×0.8 |
1d |
5 |
5.2 |
6.35-6.6 |
4.3 |
|
M6×1 |
1d |
6 |
6.2 |
7.6-7.85 |
4.2 |
|
M7×1 |
1d |
7 |
7.2 |
8.65-8.9 |
5.4 |
|
M8×1 |
1d |
8 |
8.2 |
9.85-10.1 |
6.1 |
|
M8×1.25 |
1d |
8 |
8.3 |
9.85-10.1 |
4.7 |
|
M10×1 |
1d |
10 |
10.2 |
12.1-12.5 |
7.6 |
|
M10×1.5 |
1d |
10 |
10.3 |
12.1-12.5 |
5 |
|
M12×1.5 |
1d |
12 |
12.4 |
14.4-14.8 |
6.2 |
|
M12×1.75 |
1d |
12 |
12.4 |
14.4-14.8 |
5.2 |
|
M14×1.5 |
1d |
14 |
14.4 |
17.2-17.7 |
7 |
|
M16×1.5 |
1d |
16 |
16.4 |
19.4-19.9 |
8.3 |
|
M16×2 |
1d |
16 |
16.5 |
19.4-19.9 |
6.0 |
|
M18×1.5 |
0.5d |
9 |
18.4 |
21.5-22 |
4.4 |
|
M20×1.5 |
0.75d |
15 |
20.4 |
23.7-24.2 |
8 |
|
M20×2.5 |
1d |
20 |
20.5 |
23.7-24.2 |
6.3 |
|
M22×1.5 |
0.75d |
16.5 |
22.4 |
26.3-26.8 |
8.6 |
|
M24×1.5 |
0.75d |
18 |
24.4 |
28.6-29.1 |
9.5 |
|
M24×3 |
1d |
24 |
24.6 |
28.6-29.1 |
6.3 |
|
M26×1.5 |
0.5d |
13 |
26.4 |
30.5-31 |
6.7 |
|
M27×1.5 |
0.5d |
13.5 |
27.4 |
32.2-32.7 |
6.7 |
|
M27×2 |
0.5d |
13.5 |
27.5 |
32.2-32.7 |
6.7 |
|
M30×1..5 |
0.5d |
15 |
30.4 |
35.2-35.7 |
7.8 |
|
M30×3.5 |
1d |
30 |
30.7 |
35.2-35.7 |
7 |
|
M33×1.5 |
0.5d |
16.6 |
33.4 |
38.3-38.8 |
9.1 |
|
M39×2 |
0.5d |
19.5 |
39.5 |
45.1-45.6 |
7.9 |
|
M60×4 |
0.5d |
32 |
64.9 |
65-66 |
7.3 |
2、英制钢丝螺套规格、螺纹护套规格参数表
|
英制不锈钢钢丝螺套规格参数 |
|||||
|
螺纹规格d×p |
k×d |
钢丝螺套安装后长度L(mm) |
钻头直径do(mm) |
自由状态下外径Dz(mm |
自由状态螺套圈数N(≈) |
|
4-40 |
1d |
2.9 |
3 |
3.66-4.04 |
3.2 |
|
5-40 |
1d |
3.2 |
3.4 |
4.01-4.39 |
3.7 |
|
6-32 |
1d |
3.5 |
3.7 |
4.52-4.90 |
2.8 |
|
8-32 |
1d |
4.2 |
4.4 |
5.20-5.56 |
4.0 |
|
10-24 |
1d |
4.8 |
5.1 |
6.19-6.58 |
3.3 |
|
12-24 |
1d |
5.5 |
5.8 |
6.86-7.24 |
4.0 |
|
1/4"-20 |
1d |
6.4 |
6.7 |
7.86-8.38 |
3.9 |
|
3/8"-16 |
1d |
9.5 |
9.9 |
11.48-11.99 |
4.8 |
|
7/16"-14 |
1d |
11.1 |
11.6 |
13.36-13.99 |
4.9 |
|
1/2"-13 |
1d |
12.7 |
13.1 |
15.16-15.8 |
5.2 |
|
5/8"-11 |
1d |
15.9 |
16.4 |
18.84-19.48 |
5.7 |
|
3/4"-10 |
1d |
19.1 |
19.6 |
22.36-23.00 |
6.3 |
|
1"-8 |
1d |
25.4 |
26.1 |
29.62-30.38 |
6.8 |
|
8-36 |
1d |
4.2 |
4.3 |
5.18-5.68 |
4.5 |
|
10-32 |
1d |
4.83 |
5.0 |
5.99-6.50 |
4.1 |
|
1/4"-28 |
1d |
6.35 |
6.6 |
7.77-8.28 |
5.0 |
|
5/16"-24 |
1d |
7.9 |
8.2 |
9.65-10.16 |
5.9 |
|
3/8"-24 |
1d |
9.5 |
9.8 |
11.37-11.88 |
7.3 |
|
7/16"-20 |
1d |
11.1 |
11.4 |
13.3-13.7 |
7.0 |
|
1/2"-20 |
1d |
12.7 |
13.0 |
15.03-15.67 |
7.9 |
|
9/16"-18 |
1d |
14.3 |
14.6 |
16.91-17.55 |
7.9 |
|
5/8"-18 |
1d |
15.9 |
16.2 |
18.61-19.25 |
9.4 |
|
3/4"-16 |
1d |
19.1 |
19.4 |
22.25-22.88 |
10.1 |
|
7/8"-14 |
1d |
22.2 |
22.6 |
25.93-26.69 |
10.3 |
|
1"-14 |
1d |
25.4 |
25.9 |
29.69-30.45 |
11.8 |
|
1"-12 |
1d |
25.4 |
30.0 |
29.69-30.45 |
10.0 |