螺紋護套又叫不銹鋼鋼絲螺套、螺套、螺紋襯套、牙套、絲套：是以冷軋不銹鋼線制造成螺旋狀內外同心體螺紋線圈，橫切面呈菱形，形狀類似于螺旋彈簧，具有較高的硬度及較好的表面粗糙度。安裝螺紋護套應使用專用的絲錐及安裝工具攻絲和安裝，螺套裝于螺孔或螺母中，有減輕螺紋牙受力不均和抗沖擊振動的作用，可以提高螺紋的疲勞強度，減少螺紋的磨損和抗腐蝕性能，延長螺孔壽命。
螺紋護套在選用時可根據相應的規(guī)格型號參數進行選擇，用戶可以對照鋼絲螺套規(guī)格參數表進行正確的選用到合適的產品。鋼絲螺套、螺紋護套的規(guī)格參數有公制和英制兩種尺寸參數。
鋼絲螺套、螺紋護套的規(guī)格參數有公制和英制兩種，這兩種參數表如下：
符號說明：
d--鋼絲螺套公稱直徑（螺釘公稱直徑） L—鋼絲螺套公稱長度（安裝后的螺紋長度） P--螺距
do--鉆絲套安裝用鉆頭直徑 Dz--鋼絲螺套自由狀態(tài)下外徑 N--鋼絲螺套自由狀態(tài)下圈數
1、公制鋼絲螺套規(guī)格、螺紋護套規(guī)格參數表
公制鋼絲螺套規(guī)格參數
螺紋規(guī)格d×p
k×d
鋼絲螺套安裝后長度L(mm)
鉆頭直徑do(mm)
自由狀態(tài)下外徑Dz(mm)
自由狀態(tài)螺套圈數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、英制鋼絲螺套規(guī)格、螺紋護套規(guī)格參數表
英制螺紋護套規(guī)格參數
螺紋規(guī)格d×p
k×d
鋼絲螺套安裝后長度L(mm)
鉆頭直徑do(mm)
自由狀態(tài)下外徑Dz(mm
自由狀態(tài)螺套圈數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