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 1.5d 2d

2 3 4

2

2.6-2.8

2.9 4.7 6.5

M2.5×0.45

1d 1.5d 2d

2.5 3.75 5

2.6

3.3-3.5

3.5 5.9 8.1

M3×0.5

1d 1.5d 2d

3 4.5 6

3.1

3.8-4.0

4 6.3 8.7

M4×0.7

1d 1.5d 2d

4 6 8

4.1

5.15-5.35

3.7 6 8.4

M5×0.8

1d 1.5d 2d

5 7.5 10

5.2

6.35-6.6

4.3 6.9 9.7

M6×1

1d 1.5d 2d

6 9 12

6.2

7.6-7.85

4.2 7 9.6

M7×1

1d 1.5d 2d

7 10.5 14

7.2

8.65-8.9

5.4 8.5 11.6

M8×1

1d 1.5d 2d

8 12 16

8.2

9.85-10.1

6.1 9.5 13

M8×1.25

1d 1.5d 2d

8 12 16

8.3

9.85-10.1

4.7 7.4 10.6

M10×1

1d 1.5d 2d

10 15 20

10.2

12.1-12.5

7.6 12 16.3

M10×1.5

1d 1.5d 2d

10 15 20

10.3

12.1-12.5

5 8 11.2

M12×1.5

1d 1.5d 2d

12 18 24

12.4

14.4-14.8

6.2 9.8 13.5

M12×1.75

1d 1.5d 2d

12 18 24

12.4

14.4-14.8

5.2 8.4 11.7

M14×1.5

1d 1.5d 2d

14 21 28

14.4

17.2-17.7

7 11.2 15.3

M16×1.5

1d 1.5d 2d

16 24 32

16.4

19.4-19.9

8.3 13 17.7

M16×2

1d 1.5d 2d

16 24 32

16.5

19.4-19.9

6.0 9.7 13.3

M18×1.5

0.5d 1.0d 1.5d

9 18 27

18.4

21.5-22

4.4 9.5 15

M20×1.5

0.75d 1d 1.5d

15 20 30

20.4

23.7-24.2

8 10.7 16.7

M20×2.5

1d 1.5d 2d

20 30 40

20.5

23.7-24.2

6.3 10 13.7

M22×1.5

0.75d 1d 1.5d

16.5 22 33

22.4

26.3-26.8

8.6 11.7 18

M24×1.5

0.75d 1d 1.5d

18 24 36

24.4

28.6-29.1

9.5 13 19.8

M24×3

1d 1.5d 2d

24 36 48

24.6

28.6-29.1

6.3 10 14

M26×1.5

0.5d 0.75d 1d

13 19.5 26

26.4

30.5-31

6.7 10.7 14.6

M27×1.5

0.5d 0.75d 1d

13.5 20.3 27

27.4

32.2-32.7

6.7 10.7 14.6

M27×2

0.5d 0.75d 1d

13.5 20.3 27

27.5

32.2-32.7

6.7 10.7 14.6

M30×1..5

0.5d 0.75d 1d

15 22.5 30

30.4

35.2-35.7

7.8 12.2 16.5

M30×3.5

1d 1.5d 2d

30 45 60

30.7

35.2-35.7

7 11 14.9

M33×1.5

0.5d 0.75d 1d

16.6 24.5 33

33.4

38.3-38.8

9.1 13.7 18.3

M39×2

0.5d 0.75d 1d

19.5 29.25 39

39.5

45.1-45.6

7.9 12.2 16.6

M60×4

0.5d 1d

32 64

64.9

65-66

7.3 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 1.5d 2d

2.9 4.3 5.8

3

3.66-4.04

3.2 5.1 7.2

5-40

1d 1.5d 2d

3.2 4.8 6.4

3.4

4.01-4.39

3.7 5.9 8.2

6-32

1d 1.5d 2d

3.5 5.3 7.0

3.7

4.52-4.90

2.8 4.8 6.8

8-32

1d 1.5d 2d

4.2 6.25 8.3

4.4

5.20-5.56

4.0 6.0 8.7

10-24

1d 1.5d 2d

4.8 7.2 9.6

5.1

6.19-6.58

3.3 5.4 7.5

12-24

1d 1.5d 2d

5.5 8.2 11.0

5.8

6.86-7.24

4.0 6.3 8.8

1/4"-20

1d 1.5d 2d

6.4 9.5 12.7

6.7

7.86-8.38

3.9 6.2 8.6

3/8"-16

1d 1.5d 2d

9.5 14.3 19.1

9.9

11.48-11.99

4.8 7.7 10.6

7/16"-14

1d 1.5d 2d

11.1 16.7 22.2

11.6

13.36-13.99

4.9 7.9 10.7

1/2"-13

1d 1.5d 2d

12.7 19.1 25.4

13.1

15.16-15.8

5.2 8.3 11.4

5/8"-11

1d 1.5d 2d

15.9 23.8 31.8

16.4

18.84-19.48

5.7 9.0 12.3

3/4"-10

1d 1.5d 2d

19.1 28.6 38.1

19.6

22.36-23.00

6.3 9.9 13.5

1"-8

1d 1.5d 2d

25.4 38.1 50.8

26.1

29.62-30.38

6.8 10.6 15.4

8-36

1d 1.5d 2d

4.2 6.3 8.3

4.3

5.18-5.68

4.5 7.2 9.7

10-32

1d 1.5d 2d

4.83 7.24 9.6

5.0

5.99-6.50

4.1 6.9 10

1/4"-28

1d 1.5d 2d

6.35 9.5 12.7

6.6

7.77-8.28

5.0 8.6 11.8

5/16"-24

1d 1.5d 2d

7.9 11.9 15.9

8.2

9.65-10.16

5.9 9.4 12.8

3/8"-24

1d 1.5d 2d

9.5 14.3 19.1

9.8

11.37-11.88

7.3 11.5 15.6

7/16"-20

1d 1.5d 2d

11.1 16.7 22.2

11.4

13.3-13.7

7.0 11.1 15.0

1/2"-20

1d 1.5d 2d

12.7 19.1 25.4

13.0

15.03-15.67

7.9 12.8 17.3

9/16"-18

1d 1.5d 2d

14.3 21.5 28.6

14.6

16.91-17.55

7.9 12.0 16.0

5/8"-18

1d 1.5d 2d

15.9 23.8 31.8

16.2

18.61-19.25

9.4 14.5 19.7

3/4"-16

1d 1.5d 2d

19.1 28.6 31.8

19.4

22.25-22.88

10.1 15.6 21.0

7/8"-14

1d 1.5d 2d

22.2 33.3 44.5

22.6

25.93-26.69

10.3 15.9 21.6

1"-14

1d 1.5d 2d

25.4 38.1 50.8

25.9

29.69-30.45

11.8 18.1 24.5

1"-12

1d 1.5d

25.4 38.1

30.0

29.69-30.45

10.0 15.6