Stainless steel wedge-locking washer
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- Product Description
-
Bolt Size Metric
UNC
Product Model
φ [mm]
Φ [mm]
Thickness [mm]
M6
YL6ss
6.5
10.8
2.2
M6
YL6spss
6.5
13.5
2
1/4”
YL1/4”ss
7.2
11.5
2.2
1/4”
YL1/4”spss
7.2
13.5
2.2
M8
5/16”
YL8ss
8.7
13.5
2
M8
5/16”
YL8spss
8.7
16.6
2
M10
3/8”
YL10ss
10.7
16.6
2
M10
3/8”
YL10spss
10.7
21
2
M12
YL12ss
13
19.5
2
M12
YL12spss
13
25.4
3
1/2”
YL1/2”ss
13.5
19.5
2
1/2”
YL1/2”spss
13.5
25.4
3.2
M14
9/16”
YL14ss
15.2
23
3
M14
9/16”
YL14spss
15.2
30.7
3.2
M16
5/8”
YL16ss
17
25.4
3
M16
5/8”
YL16spss
17
30.7
3.2
M18
YL18ss
19.5
29
3.2
M18
YL18spss
19.5
34.5
3.2
3/4”
YL3/4”ss
20
30.7
3.2
3/4”
YL3/4”spss
20
39
3.2
M20
YL20ss
21.4
30.7
3
M20
YL20spss
21.4
39
3.2
M22
7/8”
YL22ss
23.4
34.5
3.2
M22
7/8”
YL22spss
23.4
42
3.2
M24
YL24ss
25.3
39
3.2
M24
YL24spss
25.3
48.5
4.5
1”
YL1”ss
27.9
39
3.2
1”
YL1”spss
27.9
48.5
3.2
M27
YL27ss
28.4
42
6.8
M27
YL27spss
28.4
48.5
6.8
M30
1 1/8”
YL30ss
31.4
47
6.8
M30
1 1/8”
YL30spss
31.4
55
6.8
M33
1 1/4”
YL33ss
34.4
48.5
6.8
M36
1 3/8”
YL36ss
37.4
55
6.8
M39
1 1/2”
YL39ss
40.4
58.5
6.8
M42
YL42ss
43.2
63
6.8
Stainless steel wedge locking washer size
surface hardening
EN1.4404 (316L)Tolerance
YL6SS-YL42SS
Inner diameter φ ± 0.3mm
Outer diameter Φ ± 0.3mm
Thickness ± 0.3mmTorque reference
Yougu stainless steel washers and stainless steel screws are attached to copper/ink paste (Molykote®1000) Work situation under the condition of lubricant
Washer size
Bolt size Pitch [mm] A2-50，A4-50
Cu/C target *, GF = 65%
µth = 0.12, µh = 0.14
A2-70，A4-70
Cu/C target *, GF = 65%
µth = 0.12, µh = 0.14
A2-80，A4-80
Cu/C target *, GF = 65%
µth = 0.12, µh = 0.14
Torque [Nm] Clamping Force Load [kN]
Torque [Nm] Clamping Force Load [kN] Torque [Nm] Clamping Force Load [kN] YL3ss M3 0.5 0.6 0,7 1.5 1.5 1.7 2.0 YL4ss M4 0.7 1.5 1.2 3.0 2.6 3.6 3.4 YL5ss M5 0.8 2.9 1.9 5.5 4.1 6.7 5.5 YL6ss M6 1.0 4 2.7 8.1 5.9 11.2 7.8 YL8ss M8 1.25 8.2 5 18 11 21 14 YL10ss M10 1.5 16.1 8 26 17 34 23 YL12ss M12 1.75 27.7 12 41 25 62 33 YL14ss M14 2.0 43 16 68 34 101 45 YL16ss M16 2.0 64 21 108 46 157 61 YL18ss M18 2.5 95 26 157 56 224 75 YL20ss M20 2.5 111 33 223 72 318 95 YL22ss M22 2.5 146 39 310 89 438 118 YL24ss M24 3.0 192 48 397 103 558 137 YL27ss M27 3.0 281 63 589 134 823 179 YL30ss M30 3.5 383 77 815 164 1132 219 YL36ss M36 4.0 665 111 1445 239 1993 319 Cu/C paste * = copper/ink paste (Molykote®1000)GF= yield rate µth= thread friction coefficient
Μh= Bolt head Friction coefficient in the table below
1N=0.225Ib 1Nm=0.738ft-Ib
Tapped hole
The wedge-locking washer embeds into the corresponding substrate surface and securely locks the bolt.
Counterbore
According to DIN 974, standard outer-diameter wedge-locking washers can be used in screw fastening methods with a counterbore. As shown in the diagram, the washer is installed beneath the head of the standard screw.
Through Hole
For fastening methods with through holes, two pairs of wedge-locking washers are required—one pair to lock the screw and the other pair to lock the nut. When the screw is tightened, the nut is also locked in place.
Double-Ended Stud
Wedge-locking washers can be used in conjunction with nuts on studs, providing an alternative to methods like welding or adhesives for securing the connection.
Large Holes / Irregular Holes
In some cases, enlarged threaded holes or irregular holes are used in threaded connections to facilitate installation and fastening. In such situations, it is necessary to pair a flange nut with a widened SP anti-loosening washer. This increases the contact area of the washer, improves the embedding ratio, and effectively ensures the washer's anti-loosening performance.
Not Recommended for Use In
This section explains where the wedge-locking washers should not be used effectively, as detailed below:
◆ When the wedge-locking washer does not directly contact the substrate surface.
◆ When the substrate surface has a hardness greater than that of the wedge-locking washer.
◆ On very soft substrate surfaces, such as wood or plastic, where extreme indentations occur.
◆ In connections with no preload.
Soft Metal Material
Using SP widened washers with soft metal substrates increases the contact area between the washer and the substrate, reducing the pressure. This helps prevent collapse or damage to delicate surfaces, effectively enhancing the anti-loosening performance of the wedge-locking washer, ensuring it is not compromised by the softness of the metal material.
Elongated Holes / Irregular Holes
When elongated holes or irregular holes are used, pairing SP widened washers with flange nuts increases the load-bearing area and optimizes load distribution, ensuring the continuous anti-loosening effect of the wedge-locking washer.
Wide-Rim Washers
Yougu also produces wide-rim wedge-locking washers labeled as "SP." These "SP" washers are mainly used in large or elongated holes. Our SP washers can also be used on painted or easily damaged surfaces, or on softer materials. When paired with flange bolts or flange nuts, "SP" washers optimize load distribution.
Key words:
Stainless steel wedge-locking washer
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