Lock washers, screws and nuts

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RIPP LOCK® screw lock

If bolted connections which are subjected to movements failed, it may have been caused by the parts becoming loose. To prevent this RIPP LOCK® screw lock can help.
The technology behind this belongs to the group of mechanical unscrewing prevention elements.


The RIPP LOCK® product line involves lock washers, screws and nuts

RIPP LOCK® lock washer

RIPP LOCK® screw lock is provided with radial ribs and replaces such locking elements as spring washers or external tooth lock washers, whose standards have been retracted, and enables a standardization of parts. RIPP LOCK® is an excellent and economic alternative.


The RIPP LOCK® lock washers have radial ribs on both sides

The contact angle at the foot of the ribs is obvious larger than the gradient angle of the metric thread.

The system

When the screw or nut is assembled, the radial ribs of RIPP LOCK® lock washers form-closedly emboss in the counter-surface and in the underside of the screw head. Therefore, there can only be relative movement in the separation gap between screw head and washer. RIPP LOCK® is a reliable screw lock - even under extreme vibration or dynamic stress. Due to their high hardness, the washers can be used with screws of all property classes up to 12.9.

RIPP LOCK® lock washer – principle

Product types

RIPP LOCK® lock washers

RIPP LOCK® lock washers

Smaller external diameter for joints with counterbored cheese head

The RIPP LOCK® lock washer combines many individual advantages of existing locking screws and washers and meets the highest requirements regarding safety. As a universal product -the bigger outside diameter is the same as the standard DIN 125 / ISO 7089- it can be used in almost every application. For joints with a counterbored cheese head washers with a smaller external diameter are available. Particularly where high demands are made on the safety and/or the reduction of parts, the RIPP LOCK® washer is an excellent alternative. They are available in the materials steel and stainless steel A4.
The discs are made of steel with a hardness of 400-500 HV with a zinc flake coating surface treatment. The corrosion resistance is 480 h against red rust. Due to their high hardness, the washers can be used with screws of all property classes up to 12.9.
The stainless steel discs have a hardness of >= 800 HV.

RIPP LOCK® lock screws and nuts

The locking ribs cover the entire contact surface of the screw and nut. Thus force transmission is executed on the entire surface. During tightening the contact material in the area of the screw supports "roller-burnishment" by the locking serrations. This results in surface-hardening deformation. After tightening, no considerable flowing (setting) is detected.

The assortment of RIPP LOCK® lock screws and nuts is extensive and has a short delivery time. You can order in following strength classes:

  • Hexagon socket lock screw with strength class 100 (1.040 N/mm²)
  • Hexagon lock screw with strength class 100 (1.040 N/mm²)
  • Hexagon lock nut with strength class 10
  • Strength classes 12.9 and 12 are available on inquiry
RIPP LOCK® lock screws and nuts

Your benefits

RIPP LOCK® – Gentle to contact surfaces, also they are varnished or powder coated

Gentle to contact surfaces, also they are varnished or powder coated

RIPP LOCK® washers are the alternative for many other safety elements in the market. With this new product many previously used screw locks can be replaced and thus the number of parts can be significantly reduced.

In addition RIPP LOCK® offers many other benefits:

  • Excellent locking against self-unscrewing
  • Gentle to contact surface
  • Perfectly suitable for slotted-hole applications
  • Very low fluctuation in preload-force at defined tightening torque
  • Easy assembly and removal - multiple re-use
  • Economic benefits due to reduction and standardization of parts
  • No restriction in contact with oils and lubricants
  • Immediately active, no curing
  • No considerable setting
  • Suitable for joints with counterbored cheese head
Download Version Language Type/Size Order
RIPP LOCK® screw lock 8210/14.02 English PDF / 1394 KB Order

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Screw locks

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

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Range of supply

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RIPP LOCK® program!

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