螺纹护套又叫不锈钢钢丝螺套、螺套、螺纹衬套、牙套、丝套：是以冷轧不锈钢线制造成螺旋状内外同心体螺纹线圈，横切面呈菱形，形状类似于螺旋弹簧，具有较高的硬度及较好的表面粗糙度。安装螺纹护套应使用专用的丝锥及安装工具攻丝和安装，螺套装于螺孔或螺母中，有减轻螺纹牙受力不均和抗冲击振动的作用，可以提高螺纹的疲劳强度，减少螺纹的磨损和抗腐蚀性能，延长螺孔寿命。
螺纹护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
1.5d
2d
3
4
4.7
6.5
1.5d
2d
3.75
5
5.9
8.1
1.5d
2d
4.5
6
6.3
8.7
1.5d
2d
6
8
6
8.4
1.5d
2d
7.5
10
6.9
9.7
1.5d
2d
9
12
7
9.6
1.5d
2d
10.5
14
8.5
11.6
1.5d
2d
12
16
9.5
13
1.5d
2d
12
16
7.4
10.6
1.5d
2d
15
20
12
16.3
1.5d
2d
15
20
8
11.2
1.5d
2d
18
24
9.8
13.5
1.5d
2d
18
24
8.4
11.7
1.5d
2d
21
28
11.2
15.3
1.5d
2d
24
32
13
17.7
1.5d
2d
24
32
9.7
13.3
1.0d
1.5d
18
27
9.5
15
1d
1.5d
20
30
10.7
16.7
1.5d
2d
30
40
10
13.7
1d
1.5d
22
33
11.7
18
1d
1.5d
24
36
13
19.8
1.5d
2d
36
48
10
14
0.75d
1d
19.5
26
10.7
14.6
0.75d
1d
20.3
27
10.7
14.6
0.75d
1d
20.3
27
10.7
14.6
0.75d
1d
22.5
30
12.2
16.5
1.5d
2d
45
60
11
14.9
0.75d
1d
24.5
33
13.7
18.3
0.75d
1d
29.25
39
12.2
16.6
1d
64
15.6
2、英制钢丝螺套规格、螺纹护套规格参数表
英制螺纹护套规格参数
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
1.5d
2d
4.3
5.8
5.1
7.2
1.5d
2d
4.8
6.4
5.9
8.2
1.5d
2d
5.3
7.0
4.8
6.8
1.5d
2d
6.25
8.3
6.0
8.7
1.5d
2d
7.2
9.6
5.4
7.5
1.5d
2d
8.2
11.0
6.3
8.8
1.5d
2d
9.5
12.7
6.2
8.6
1.5d
2d
14.3
19.1
7.7
10.6
1.5d
2d
16.7
22.2
7.9
10.7
1.5d
2d
19.1
25.4
8.3
11.4
1.5d
2d
23.8
31.8
9.0
12.3
1.5d
2d
28.6
38.1
9.9
13.5
1.5d
2d
38.1
50.8
10.6
15.4
1.5d
2d
6.3
8.3
7.2
9.7
1.5d
2d
7.24
9.6
6.9
10
1.5d
2d
9.5
12.7
8.6
11.8
1.5d
2d
11.9
15.9
9.4
12.8
1.5d
2d
14.3
19.1
11.5
15.6
1.5d
2d
16.7
22.2
11.1
15.0
1.5d
2d
19.1
25.4
12.8
17.3
1.5d
2d
21.5
28.6
12.0
16.0
1.5d
2d
23.8
31.8
14.5
19.7
1.5d
2d
28.6
31.8
15.6
21.0
1.5d
2d
33.3
44.5
15.9
21.6
1.5d
2d
38.1
50.8
18.1
24.5
1.5d
38.1
15.6