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China Suppliers Factory DIN 985 Refined Nylon Lock Nut - Grade 4.8, 8.8, 10.9, 12.9, Various Materials and Treatments
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China Suppliers Factory DIN 985 Refined Nylon Lock Nut - Grade 4.8, 8.8, 10.9, 12.9, Various Materials and Treatments

Introducing our high-quality nylon locking nuts, manufactured in China by leading suppliers and factories. Available in various grades including 4.8, 8.8, 10.9, and 12.9, our locking nuts are crafted from premium materials such as Q235, 35K, 45K, 40Cr, 35Crmo, and 42Crmo. We offer an array of surface treatments including blackened, electrogalvanized, Dacromet, hot-dip galvanized, and galvanized to meet diverse application needs.

 

These nylon locking nuts are designed to provide reliable self-locking performance using frictional force between the nut and bolt. However, it's important to note that their effectiveness may be reduced under dynamic loads. For critical applications, we recommend implementing additional anti-loosening measures to enhance the reliability of the nut's locking mechanism. Choose our nylon locking nuts for superior performance and durability in mechanical and industrial applications.

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    Product Detail

    Basic concepts

    products
    1
    Other names: Root Nut, Anti loosening Nut, Nazi.
    2
    Usage: Lock threaded external joints or other pipe fittings.

    The working principle of a nut is to use the frictional force between the nut and the bolt for self-locking. However, the reliability of this self-locking will decrease under dynamic loads. In some important occasions, we will take some anti loosening measures to ensure the reliability of nut locking. Lock checking nuts are one of the anti loosening measures.

    The anti loosening effect of nylon locking nuts mainly depends on the interaction force between the nut and bolt engagement threads. There are many ways to improve the interaction force between the meshing threads, such as improving the thread structure of the Schbiler nut, roughening the nylon nut, and surface treatment of the thread.
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    Usage

    products
    Nylon lock nuts are used as follows123:
    1
    Insert the nylon lock nut into the thread and turn it tightly by hand, taking care not to use force.
    2
    When using power tools for tightening, the torque should be appropriately adjusted to avoid the danger caused by over-tightening.
    3
    Attention should be paid to maintaining the vertical when tightening, so as to avoid unnecessary deviation and failure of the fastening force.
    4
    Tighten the lock nut onto the bolt until it fits snugly against the material it is holding in.
    5
    Then, tighten the second nut onto the lock nut so that the teeth of the lock nut bite the thread of the bolt, locking it in place.
    6
    Install the washers at the threaded ends of the correctly sized stainless steel bolts or stud bolts first.
    7
    Replace the nut or bolt that locks the bolt by hand until you encounter resistance so that the nylon is inserted.
    8
    Tighten the lock nut firmly and, by using a wrench, replace the original nut and rotate clockwise.
    9
    If the bolt head is tight, use the same second wrench to tighten it while tightening the nut.

    Technical Specifications

    data sheet
    Thread size M3 M4 M5 M6 M7 M8 M10 M12 M14 M16 M18
    Pitch Coarse teeth 0.5 0.7 0.8 1 1 1.25 1.5 1.75 2 2 2.5
    Fine teeth 1 / / / / / 1 1 1.5 1.5 1.5 2
    Fine teeth 2 / / / / / / 1.25 1.25 / / 1.5
    minimum 3 4 5 6 7 8 10 12 14 16 18
    maximum 3.45 4.6 5.75 6.75 7.75 8.75 10.8 13 15.1 17.3 19.5
    minimum 4.6 5.9 6.9 8.9 9.6 11.6 15.6 17.4 20.5 22.5 24.9
    minimum 6.01 7.66 8.79 11.05 12.12 14.38 18.9 21.1 24.49 26.75 29.56
    Maximum = Nominal value 4 5 5 6 7.5 8 10 12 14 16 18.5
    minimum 3.7 4.7 4.7 5.7 7.14 7.64 9.64 11.57 13.3 15.3 17.66
    minimum 2.4 2.9 3.2 4 4.7 5.5 6.5 8 9.5 10.5 13
    minimum 1.65 2.2 2.75 3.3 3.85 4.4 5.5 6.6 7.7 8.8 9.9
    Maximum = Nominal value 5.5 7 8 10 11 13 17 19 22 24 27
    minimum 5.32 6.78 7.78 9.78 10.73 12.73 16.73 18.67 21.67 23.67 26.16
    1,000 pieces weigh kg 0.5 1 1.4 2.4 3 5.1 10.6 17.2 26 34 45
    Thread size M20 M22 M24 M27 M30 M33 M36 M39 M42 M45 M48
    Pitch Coarse teeth 2.5 2.5 3 3 3.5 3.5 4 4 4.5 4.5 5
    Fine teeth 1 2 2 2 2 2 2 3 3 3 3 3
    Fine teeth 2 1.5 1.5 / / / / / / / / /
    minimum 20 22 24 27 30 33 36 39 42 45 48
    maximum 21.6 23.7 25.9 29.1 32.4 35.6 38.9 42.1 45.4 48.6 51.8
    minimum 27.7 29.5 33.2 38 42.7 46.6 51.1 55.9 60.6 64.7 69.4
    minimum 32.95 35.03 39.55 45.2 50.85 55.37 60.79 66.44 72.09 76.95 82.6
    Maximum = Nominal value 20 22 24 27 30 33 36 39 42 45 48
    minimum 18.7 20.7 22.7 25.7 28.7 31.4 34.4 37.4 40.4 43.4 46.4
    minimum 14 15 15 17 19 22 25 27 29 32 36
    minimum 11 12.2 13.2 14.8 16.5 18.2 19.8 21.5 23.1 24.8 26.5
    Maximum = Nominal value 30 32 36 41 46 50 55 60 65 70 75
    minimum 29.16 31 35 40 45 49 53.8 58.8 63.8 68.1 73.1
    1,000 pieces weigh kg 65 75 100 162 212 317 415 499 628 771 998

    Frequently Asked Questions

    FAQ

    Q:What are the common alternative names for lock nuts?

    Lock nuts are also widely known as Root Nuts, Anti loosening Nuts, or Nazis depending on the industry and region.

    Q:How do nylon lock nuts achieve their anti-loosening effect?

    The anti-loosening performance relies primarily on the interaction and friction force between the nut and bolt engagement threads. Under dynamic loads, standard nuts can lose their self-locking capabilities, making nylon inserts necessary to maintain constant tension.

    Q:What is the correct manual installation method for a nylon lock nut?

    First, insert the nut into the thread and turn it by hand without force. Tighten it against the material, and then tighten a second nut onto the lock nut so that its teeth bite the thread of the bolt, locking it securely in place.

    Q:Can power tools be used to tighten nylon lock nuts?

    Yes, power tools can be used, but the torque must be carefully adjusted. Over-tightening can damage the nylon insert or strip the threads, leading to fastening failure.

    Q:How can the thread interaction force of lock nuts be improved?

    Methods to improve thread interaction force include modifying the thread structure (such as using a Schbiler nut), roughening the nylon nut material, or applying specialized surface treatments to the thread.

    Q:What is the weight specification for standard M10 and M20 lock nuts?

    According to the technical specifications, 1,000 pieces of M10 lock nuts weigh approximately 10.6 kg, while 1,000 pieces of M20 lock nuts weigh approximately 65 kg.