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Twins-Lock Washers DIN25021

Twins-Lock Washers DIN25021 Featured Image
  • Twins-Lock Washers DIN25021
  • Twins-Lock Washers DIN25021
  • Twins-Lock Washers DIN25021
  • Twins-Lock Washers DIN25021

Short Description:

Twins-Lock Washers DIN25021, also known as Double stack self-locking washers, or Anti-vibration self-locking washers, works by using tension rather than friction, which has been the basis for most traditional fastening methods. This ensures the securing of threaded systems. The part consists of two identical flat washers which have a set of cams on one side and a radial knurling on the other side. A Twins-Lock washer is supplied with a pair of washers glued together to avoid any orientation mistake during assembly. In case of reuse, the washers need to be assembled cams face to cams face.


Product Detail

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► Twins-Lock Washers DIN25021 Overview

● Twins-Lock Washers Introduction ● Twins-Lock Washers Dimensions
● Twins-Lock Washers Materials ● Twins-Lock Washers Surface treatments
● Twins-Lock Washers Advantages ● Twins-Lock Washers Applications

► Twins-Lock Washers Introduction

DIN2502

The angle of inclination α of the washer cam is bigger than the pitch ß of the screw thread. When the fastener is tightened, the radial knurling surfaces grip both the bearing surface of the fastener and the material into which the screw is being fastened. The larger angle of the cam α, compared to the smaller angle of the screw thread ß, will not allow the screw to loosen because of the tension caused by the cam lifting.

Durlok Washer 65Mn
Twins-Lock Dacromet
Twins-Lock SS
Twins-Lock

►  Twins-Lock Washers DIN25021 Dimensions

DIN25021
Twins-Lock Washers, Spring steel 65Mn
Washer size Bolt size
UNC		 Metric d(mm) D(mm) T(mm) Weight/M pairs
Min Max Min Max Min Max (kgs)
TL3 #5 M3 3.30 3.50 6.80 7.20 1.55 2.05 0.34
TL3.5 #6 M3.5 3.80 4.00 7.40 7.80 1.55 2.05 0.40
TL3.5 sp #6 M3.5 3.80 4.00 8.80 9.20 1.55 2.05 0.60
TL4 #8 M4 4.30 4.50 7.40 7.80 1.55 2.05 0.40
TL4 sp #8 M4 4.30 4.50 8.80 9.20 1.55 2.05 0.60
TL5 #10 M5 5.30 5.50 8.80 9.20 1.55 2.05 0.50
TL5 sp #10 M5 5.30 5.50 10.60 11.00 1.55 2.05 1.10
TL6   M6 6.40 6.60 10.60 11.00 1.55 2.05 0.70
TL6 sp   M6 6.40 6.60 13.30 13.70 2.25 2.75 2.00
TL1/4" 1/4"   7.10 7.30 11.30 11.70 1.55 2.05 0.80
TL1/4" sp 1/4"   7.10 7.30 13.30 13.70 2.25 2.75 1.80
TL8 5/16" M8 8.60 8.80 13.30 13.70 2.25 2.75 1.50
TL8 sp 5/16" M8 8.60 8.80 16.40 16.80 2.25 2.75 2.90
TL3/8" 3/8"   10.20 10.40 16.40 16.80 2.25 2.75 2.30
TL3/8" sp 3/8"   10.20 10.40 20.80 21.20 2.25 2.75 4.70
TL10   M10 10.50 10.90 16.40 16.80 2.25 2.75 2.30
TL10 sp   M10 10.50 10.90 20.80 21.20 2.25 2.75 4.65
TL11 7/16" M11 11.20 11.60 18.30 18.70 2.25 2.75 2.90
TL12   M12 12.80 13.20 19.30 19.70 2.25 2.75 2.90
TL12 sp   M12 12.80 13.20 25.20 25.60 3.15 3.65 9.10
TL1/2" 1/2"   13.30 13.70 19.30 19.70 2.25 2.75 2.70
TL1/2" sp 1/2"   13.30 13.70 25.20 25.60 3.15 3.65 9.00
TL14 9/16" M14 15.00 15.40 22.80 23.20 3.15 3.65 6.20
TL14 sp 9/16" M14 15.00 15.40 30.50 30.90 3.15 3.65 14.00
TL16 5/8" M16 16.80 17.20 25.20 25.60 3.15 3.65 6.60
TL16 sp 5/8" M16 16.80 17.20 30.50 30.90 3.15 3.65 12.70
TL18   M18 19.30 19.70 28.80 29.20 3.15 3.65 8.50
TL18 sp   M18 19.30 19.70 34.30 34.70 3.15 3.65 15.50
TL3/4" 3/4"   19.80 20.20 30.50 30.90 3.15 3.65 10.20
TL3/4" sp 3/4"   19.80 20.20 38.80 39.20 3.15 3.65 22.00
TL20   M20 21.20 21.60 30.50 30.90 3.15 3.65 9.30
TL20 sp   M20 21.20 21.60 38.80 39.20 3.15 3.65 20.40
TL22 7/8" M22 23.20 23.60 34.30 34.70 3.15 3.65 12.90
TL22 sp 7/8" M22 23.20 23.60 41.80 42.20 4.35 4.85 33.10
TL24   M24 25.10 25.50 38.80 39.20 3.15 3.65 16.80
TL24 sp   M24 25.10 25.50 48.30 48.70 4.35 4.85 45.10
TL1" 1"   27.70 28.10 38.80 39.20 3.15 3.65 15.30
TL1" sp 1"   27.70 28.10 48.30 48.70 4.35 4.85 42.00
TL27   M27 28.20 28.60 41.70 42.30 5.55 6.05 32.70
TL27 sp   M27 28.20 28.60 48.20 48.80 5.55 6.05 52.90
TL30 1 1/8" M30 31.20 31.60 46.70 47.30 5.55 6.05 41.10
TL30 sp 1 1/8" M30 31.20 31.60 58.20 58.80 6.35 6.85 89.60
TL33 1 1/4" M33 34.20 34.60 48.20 48.80 5.55 6.05 40.00
TL36 1 3/8" M36 37.20 37.60 54.70 55.30 6.35 6.85 55.90
TL39 1 1/2" M39 40.20 40.60 58.20 58.80 6.35 6.85 62.80
TL42   M42 43.00 43.40 62.70 63.30 6.35 6.85 74.70
Technical standard is subject to update without prior notice!
Twins-Lock washers with enlarged outer diameter (sp) in combination with flanged nuts/ bolts are recommended for use on large/long holes, painted surfaces or soft materials, e.g. aluminium.
Twins-Lock Washers, Stainless Steel
Washer size Bolt size
UNC		 Metric d(mm) D(mm) T(mm) Weight/M pairs 
Min Max Min Max Min Max (kgs)
TL3 #5 M3 3.30  3.50  6.80  7.20  1.75  2.25  0.40 
TL3.5 #6 M3.5 3.80  4.00  7.40  7.80  1.75  2.25  0.40 
TL3.5 sp #6 M3.5 3.80  4.00  8.80  9.20  1.75  2.25  0.70 
TL4 #8 M4 4.30  4.50  7.40  7.80  1.75  2.25  0.40 
TL4 sp #8 M4 4.30  4.50  8.80  9.20  1.75  2.25  0.70 
TL5 #10 M5 5.30  5.50  8.80  9.20  1.75  2.25  0.60 
TL5 sp #10 M5 5.30  5.50  10.60  11.00  1.75  2.25  1.10 
TL6   M6 6.40  6.60  10.60  11.00  1.75  2.25  0.90 
TL6 sp   M6 6.40  6.60  13.30  13.70  1.75  2.25  1.65 
TL1/4" 1/4"   7.10  7.30  11.30  11.70  1.75  2.25  0.95 
TL1/4" sp 1/4"   7.10  7.30  13.30  13.70  1.75  2.25  1.55 
TL8 5/16" M8 8.60  8.80  13.30  13.70  1.75  2.25  1.25 
TL8 sp 5/16" M8 8.60  8.80  16.40  16.80  1.75  2.25  2.35 
TL3/8" 3/8"   10.20  10.40  16.40  16.80  1.75  2.25  1.95 
TL3/8" sp 3/8"   10.20  10.40  20.80  21.20  1.75  2.25  3.95 
TL10   M10 10.50  10.90  16.40  16.80  1.75  2.25  1.90 
TL10 sp   M10 10.50  10.90  20.80  21.20  1.75  2.25  3.85 
TL11 7/16" M11 11.20  11.60  18.30  18.70  1.75  2.25  2.60 
TL12   M12 12.80  13.20  19.30  19.70  1.75  2.25  2.50 
TL12 sp   M12 12.80  13.20  25.20  25.60  2.75  3.25  8.70 
TL1/2" 1/2"   13.30  13.70  19.30  19.70  1.75  2.25  2.35 
TL1/2" sp 1/2"   13.30  13.70  25.20  25.60  2.75  3.25  8.40 
TL14 9/16" M14 15.00  15.40  22.80  23.20  2.75  3.25  5.20 
TL14 sp 9/16" M14 15.00  15.40  30.50  30.90  2.75  3.25  13.30 
TL16 5/8" M16 16.80  17.20  25.20  25.60  2.75  3.25  6.30 
TL16 sp 5/8" M16 16.80  17.20  30.50  30.90  2.75  3.25  11.90 
TL18   M18 19.30  19.70  28.80  29.20  2.75  3.25  8.30 
TL18 sp   M18 19.30  19.70  34.30  34.70  2.75  3.25  15.30 
TL3/4" 3/4"   19.80  20.20  30.50  30.90  2.75  3.25  9.60 
TL3/4" sp 3/4"   19.80  20.20  38.80  39.20  2.75  3.25  21.00 
TL20   M20 21.20  21.60  30.50  30.90  2.75  3.25  8.55 
TL20 sp   M20 21.20  21.60  38.80  39.20  2.75  3.25  20.50 
TL22 7/8" M22 23.20  23.60  34.30  34.70  2.75  3.25  12.30 
TL22 sp 7/8" M22 23.20  23.60  41.80  42.20  2.75  3.25  22.30 
TL24   M24 25.10  25.50  38.80  39.20  2.75  3.25  15.20 
TL24 sp   M24 25.10  25.50  48.30  48.70  2.75  3.25  35.00 
TL1" 1"   27.70  28.10  38.80  39.20  2.75  3.25  14.20 
TL1" sp 1"   27.70  28.10  48.30  48.70  2.75  3.25  32.20 
TL27   M27 28.20  28.60  41.70  42.30  6.30  6.80  34.50 
TL27 sp   M27 28.20  28.60  48.20  48.80  6.30  6.80  58.50 
TL30 1 1/8" M30 31.20  31.60  46.70  47.30  6.30  6.80  44.30 
TL30 sp 1 1/8" M30 31.20  31.60  58.20  58.80  6.30  6.80  95.30 
TL33 1 1/4" M33 34.20  34.60  48.20  48.80  6.30  6.80  42.50 
TL36 1 3/8" M36 37.20  37.60  54.70  55.30  6.30  6.80  59.60 
TL39 1 1/2" M39 40.20  40.60  58.20  58.80  6.30  6.80  67.40 
TL42   M42 43.00  43.40  62.70  63.30  6.30  6.80  79.60 
Technical standard is subject to update without prior notice!
Twins-Lock washers with enlarged outer diameter (sp) in combination with flanged nuts/ bolts are recommended for use on large/long holes, painted surfaces or soft materials, e.g. aluminium.

►  Twins-Lock Washers Materials

Materials Product Instructions
Spring steel: 65Mn, 35CrMo, 51CrV4 ≤200°C, used in a regular environment.
Stainless steel: SUS304, SUS316(A2, A4) ≤300°C, used in corrosive environment.
Customized. Any technical questions, please contact us at info@techstamping.com

►  Twins-Lock Washers Surface Treatments

Surface Treatments
● Dacromet ● Mechanical galvanizing ● Nickel plating
● Phosphate ● Stainless steel hardening ● Customized

►  Twins-Lock Washers Advantages

Thanks to its own know-how and the lab tests carried out, Twins-Lock washers can ensure the following main advantages.

1. Best locking performance in the presence of vibrations and dynamic loads.

2. The system works independently from the type of lubrication used and guarantees a secure locking in dry as well as in lubricated conditions. The use of high quality lubricant in order to maximize the performance of this fastening system is recommended.

3. Reusable - depending on application and environment.

4. Locking of fixing elements with high as well as low pre-load.

5. Can be used with any kind of bolt/nut of any class of resistance (up to 12.9).

6. No retightening required.

7. Assembly-friendly system as the pieces are delivered pre-glued (cams face against cams face).

► Twins-Lock Washers Applications

Twins-lock washers are used in a wide range of industries: Energy, transportation, maritime, mining and quarrying, construction and bridge construction, manufacturing, processing, shipbuilding, forestry and agriculture, heavy vehicles and the military.

We appreciate your support to Technical Stamping(Shanghai) Co., Ltd. up Return to homepage

► Twins-Lock Washers FAQ

Q1. Can you provide customization services?

A. Yes, T&S initially manufactures standard flat washers, lock washers and conical washers, but in the past 17 years, T&S has already developed successfully 980 customized parts in different sizes.

Q2. What types of customized parts do you provide?

A. T&S provides stamping parts, sheet metal parts, machining parts, cold heading parts, hot forging parts, cold working parts, Zn-Al die casting parts, powder metallurgy parts, and other customized parts.
T&S is capable of providing customized parts not only with single-process, but also with a variety of combined crafts.

Q3. Does every customized part need mould fee? 

A. Not all customized parts cost mould fee. For example, a turning part does not need a mould yet requires the appropriate tools and fixtures. T&S spends time and labor making samples, therefore charges certain sample fees.

Q4. Where are your factories, can I have a visit? 

A. T&S has its factories. We have invested in multiple factories, which are mainly located in Zhejiang and Jiangsu Province. You can visit the corresponding factories depending on the products to be purchased. Please feel free to visit our factories and offer guidance. We can pick you up at the nearest airport or train station.

Q5. Can you provide free samples?

A. Yes, for standard fasteners we can provide free samples. Please kindly understand that we charge certain fees before making customized samples.

Q6. How do you guarantee quality?

A. T&S conducts quality control in strict accordance with the ISO9001 Quality Certification System. T&S practices the worker's self-inspection and routing inspection on a regular basis during production, the QC strict sampling before packaging and delivery after compliance. Each batch of products is accompanied by Inspection Certificate from T&S and Raw Material Test Report from the steel factory.

Q7. If I have paid the mould fee yet receive nonconforming samples, what will you do?

A. For the first development of non-standard parts, we refund the mould fee in case of 2 times of nonconforming samples delivered. If you give us more chances to make the moulds, we will continue to study until success.

Q8. What is your MOQ? Any mould fee? Is the mould fee refundable?

A. MOQ for non-standard fasteners: 1-2 tons according to different parts. We charge mould fees, which will be refunded when reaching a certain quantity, more to be described in our quotation.
B. MOQ for stamping parts : Depending on the degree of difficulty and dimensions of the parts. We will charge mould fee and refund it when reaching a certain quantity, more to be described in our quotation.
C. MOQ for turning parts is 100 pieces, and no mould fee to be charged. But if you need samples for confirming, we will charge sample fee and refund it after doing the order.

Q9. What is your delivery time?

A: 15-30 days for samples, 25-50 days for mass production.

Q10. Do you accept the use of our own logo?

A. If the order quantity is large, we absolutely accept OEM.

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