Screw locks

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Screw lockings

In the future, locking of screwed connections will gain more and more importance since often not all parameters of influence can be taken into account upon designing.

Characteristics

screw locking elements

In total, methods for thread locking which do not require an additional locking element provide higher process liability. This applies especially to chemical thread locks, screws and nuts with locking toothing, direct screw-fittings and, with restrictions, to locknuts according to DIN EN ISO 2320.
Special locking elements which, in addition to their locking function, provide other benefits regarding the joint (e. g. RIPP LOCK® lock washers, NORD-LOCK® washers, HELICOIL® plus screwlock) gain increasing importance. The use of screw locks with form fit (crown nut with split pin, etc.) or screw locks for which the corresponding standards have already been withdrawn (spring washers, tooth lock washers) should be avoided. Up-to-date mechanical systems are often not standardised and / or are subject to patents, legal protection of utility patents, etc.

Locking elements

  • RIPP LOCK®

    RIPP LOCK® lock washers

    Functional principle:
    locking elements


    Mode of action: Unscrew lock

    B 53065

    RIPP LOCK®
  • Disc spring

    Disc spring

    Functional principle:
    Braced resilient elements


    Mode of action: Setting lock

    DIN 2093

  • Conical spring washer

    Conical spring washer

    Functional principle:
    Braced resilient elements


    Mode of action: Setting lock

    DIN 6796

  • Screw and washer assembly

    Screw and washer assembly

    Functional principle:
    Braced resilient elements


    Mode of action: Setting lock

    DIN 6900

  • Nut and washer assembly

    Nut and washer assembly

    Functional principle:
    Braced resilient elements


    Mode of action: Setting lock

    B 53010

  • Lock washers

    Lock washers

    Functional principle:
    Braced resilient elements


    Mode of action: Setting lock

    B 53070

  • Flange screw

    Flange screw

    Functional principle:
    Reduction in surface pressure


    Mode of action: Setting lock

    DIN EN 1665

  • Washer

    Washer

    Functional principle:
    Reduction in surface pressure


    Mode of action: Setting lock

    e. g. ISO 7089

  • Crown nut

    Crown nut

    Functional principle:
    Form-closed elements


    Mode of action: Locking device

    DIN 935

  • Screw with split pin hole

    Screw with split pin hole

    Functional principle:
    Form-closed elements


    Mode of action: Locking device

    DIN 962

  • Prevailing torque type all-metal nut

    Prevailing torque type all-metal nut

    Functional principle:
    Clamping elements


    Mode of action: Locking device

    e. g. DIN 6927

  • Nut with plastic insert

    Nut with plastic insert

    Functional principle:
    Clamping elements


    Mode of action: Locking device

    DIN 6926

  • Tapping screw

    Tapping screw

    Functional principle:
    Individual functional principle


    Mode of action: Locking device

    e. g. DIN 7500

  • Lock thread

    Lock thread

    Functional principle:
    Individual functional principle


    Mode of action: Locking device

    No standard

  • HELICOIL® screwlock

    HELICOIL® screwlock

    Functional principle:
    Individual functional principle


    Mode of action: Locking device

    B 62000

  • Locknut

    Locknut

    Functional principle:
    Individual functional principle


    Mode of action: Locking device

    No standard

  • Fine thread

    Fine thread

    Functional principle:
    Individual functional principle


    Mode of action: Locking device

    DIN 13 part 2 ff.

  • Ribbed screw / nut

    Ribbed screw / nut

    Functional principle:
    Locking elements


    Mode of action: Unscrew lock

    B 158

  • Serrated screw / nut

    Serrated screw / nut

    Functional principle:
    Locking elements


    Mode of action: Unscrew lock

    e.g. B 53085

  • Profiled washer

    Profiled washer

    Functional principle:
    Locking elements


    Mode of action: Unscrew lock

    e. g. B 53072

  • Microcapsule adhesives

    Microcapsule adhesives

    Functional principle:
    Adhesive elements


    Mode of action: Unscrew lock

    DIN 267, part 27

  • Liquid adhesives

    Liquid adhesives

    Functional principle:
    Adhesive elements


    Mode of action: Unscrew lock

    No standard

  • NORD-LOCK®

    NORD-LOCK® locking pair

    Functional principle:
    Wedging and locking


    Mode of action: Unscrew lock

    DIN 267, part 27

Withdrawn standards

Until today, the DIN, the German Institute for Standardization (Deutsches Institut für Normung e.V.), has withdrawn the following standards concerning locking elements:

  • Spring washers (DIN 127, DIN 128 and DIN 6905)
  • Wave spring washers (DIN 137 and DIN 6904)
  • Tooth lock washers (DIN 6797)
  • Serrated lock washers (DIN 6798 and DIN 6908)
  • Safety plates (DIN 93, DIN 432 and DIN 463)
  • Safety cups (DIN 526)
  • Locknuts (DIN 7967)
  • Crown nuts with split pin (DIN 937)

For increased stability, these standards do not provide locking action. Neither are they suitable as setting locks.

Variety of screw locks


Screw locks

More about this topic: See Böllhoff News no. 27!

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