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The DIN25201 wedge lock washer features a unique embedded design with a wedge angle, which increases the tension on the bolt to prevent loosening. When exposed to vibration, the washer's angled teeth engage with both the bolt and the connected parts, effectively locking them in place and preventing any loosening over time.
This DIN25201 wedge lock washer also offers excellent sealing, preventing leakage of liquids and gases, which makes it ideal for applications requiring reliable sealing. They are reusable, it's a cost-effective solution. The installation is quick and easy – simply place the washer under the nut or bolt without the need for any special tools.
They are typically made from high-temperature and corrosion-resistant materials, they can be made in stainless steel or carbon steel. Carbon steel washers are available with various surface treatments, including spring steel phosphating, galvanizing, nickel plating, and Dacromet coating, to meet specific performance requirements.
DIN25201 wedge lock washers are widely used in mechanical equipment, automotive, aerospace, and many other industries, providing a reliable solution for securing fasteners and preventing loosening, even under the toughest conditions.
Specification

|
Washer Size |
Metric Thread |
UNC Thread |
Inner Diameter (d) |
Inner Diameter (d) - Tolerance |
Outer Diameter (dc) |
Outer Diameter (dc) - Tolerance |
Thickness (h) |
Thickness (h) - Tolerance |
|
NL3 |
M3 |
#5 |
3.4 |
±0.1 |
7 |
±0.2 |
1.8 |
±0.25 |
|
NL4 |
M4 |
#8 |
4.4 |
7.6 |
1.8 |
|||
|
NL4sp |
M4 |
#8 |
4.4 |
9 |
1.8 |
|||
|
NL5 |
M5 |
#10 |
5.4 |
9 |
1.8 |
|||
|
NL5sped) |
M5 |
#10 |
5.4 |
10.8 |
1.8 |
|||
|
NL6 |
M6 |
1/4 |
6.5 |
10.8 |
1.8 |
|||
|
NL6sp |
M6 |
1/4 |
6.5 |
13.5 |
1.8 |
|||
|
NL8 |
M8 |
5/16 |
8.7 |
13.5 |
1.8 |
|||
|
NL8sp |
M8 |
5/16 |
8.7 |
16.6 |
2.5 |
|||
|
NL10 |
M10 |
7/16 |
10.7 |
±0.2 |
16.6 |
2.5 |
||
|
NL10sp |
M10 |
7/16 |
10.7 |
21 |
2.5 |
|||
|
NL11 |
M11 |
7/16 |
11.4 |
18.5 |
2.5 |
|||
|
NL12 |
M12 |
1/2 |
13 |
19.5 |
2.5 |
|||
|
NL12sp |
M12 |
1/2 |
13 |
25.4 |
3.4 |
|||
|
NL14 |
M14 |
9/16 |
15.2 |
23 |
3.4 |
|||
|
NL14sp |
M14 |
9/16 |
15.2 |
30.7 |
3.4 |
|||
|
NL16 |
M16 |
5/8 |
17 |
25.4 |
3.4 |
|||
|
NL16sp |
M16 |
5/8 |
17 |
30.7 |
3.4 |
|||
|
NL18 |
M18 |
19.5 |
29 |
3.4 |
||||
|
NL18sp |
M18 |
19.5 |
34.5 |
3.4 |
||||
|
NL20 |
M20 |
21.4 |
30.7 |
3.4 |
||||
|
NL20sp |
M20 |
21.4 |
39 |
3.4 |
||||
|
NL22 |
M22 |
7/8 |
23.4 |
34.5 |
3.4 |
|||
|
NL22sp |
M22 |
7/8 |
23.4 |
42 |
4.6 |
|||
|
NL24 |
M24 |
25.3 |
39 |
3.4 |
||||
|
NL24sp |
M24 |
25.3 |
48.5 |
4.6 |
||||
|
NL27 |
M27 |
28.4 |
42 |
±0.3 |
5.8 |
0 |
||
|
NL27sp |
M27 |
28.4 |
48.5 |
6.6 |
||||
|
NL30 |
M30 |
1-1/8 |
31.4 |
47 |
5.8 |
|||
|
NL30sp |
M30 |
1-1/8 |
31.4 |
58.5 |
6.6 |
|||
|
NL33 |
M33 |
1-1/4 |
34.4 |
48.5 |
5.8 |
|||
|
NL33sp |
M33 |
1-1/4 |
34.4 |
58.5 |
6.6 |
|||
|
NL36 |
M36 |
1-3/8 |
37.4 |
55 |
5.8 |
|||
|
NL36sp |
M36 |
1-3/8 |
37.4 |
63 |
6.6 |
|||
|
NL39 |
M39 |
1-1/2 |
40.4 |
58.5 |
5.8 |
|||
|
NL42 |
M42 |
43.2 |
63 |
5.8 |
||||
|
NL45 |
M45 |
1-3/4 |
46.2 |
±0.5 |
70 |
0 |
7 |
±0.75 |
|
NL48 |
M48 |
49.6 |
75 |
7 |
||||
|
NL52 |
M52 |
2 |
53.6 |
80 |
7 |
|||
|
NL56 |
M56 |
2-1/4 |
59.1 |
85 |
7 |
|||
|
NL60 |
M60 |
63.1 |
90 |
7 |
Product Picture






Production Process










Quality Control









Surface Treatment
Offer a variety of surface treatments for our screws to meet different needs and environmental conditions. Such as zinc plating, nickel plating, hot-dip galvanizing, anodizing, zinc nickel alloy, dacromet coating, phosphating, etc.

Custom Service
With 18 years of experience in the fasteners area, Zeyao Hardware specializes in manufacturing custom fasteners, including screws, bolts, nuts, rivets, standoffs, spacers, wrenches, pins, and more. Welcome to send your inquiries to get a free quote.

FAQ
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