RIPP LOCK® screw lock

RIPP LOCK® lock washers The system 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. Prior to assembly The following must apply for locking: β > φ Working-principle Because of the preload force the ribs of the RIPP LOCK® washers are embossed into the counter surface during assembly. The resulting form lock prevents self-loosening of the connection reliably, even under extreme vibrations or high dynamic stresses. Due to their high hardness the washers can be used with screws of all property...

Benefits n Excellent locking against self-unscrewing – even under high dynamic stress Junkers vibration test according to DIN 65151 Screw M 10 (8.8) galvanically zinc coated 30000 RIPP LOCK® lock washers S safety washers DIN 127 (spring washers) 100% preload force is retained 80% preload force is reduced Load change n Very low fluctuation in preload force at defined tightening torque without RIPP LOCK® preload force with RIPP LOCK® 10 % preload force tightening torque n Gentle to contact surface – even to coated or powder coated surfaces RIPP LOCK® (painted surfaces) RIPP LOCK® (aluminium)

■ Universal use - outside diameter = DIN 125/ISO 7089 Further benefits ■ Easy assembly and removal - multiple reuse ■ Economic benefits due to reduction and standardisation of assortment ■ Small space requirements ■ Not affected by contact with lubricants or greases ■ Perfectly suitable for low-strength metals (aluminium, copper, aluminium and magnesium casting alloys, etc.) ■ Suitable for all property classes up to 12.9 ■ Particularly suitable for sensitive surfaces such as zinc coated, chromium-plated, coated or powder coated surfaces Immediate effect - no curing Same temperature range as high-tensile...

Possible applications RIPP LOCK® screw fastening in tapped holes Through screw joints with two RIPP LOCK® washers With RIPP LOCK®, adhesion of studs is not required anymore RIPP LOCK® shall not be used on loose plain washers Tightening torques To minimise creep and relaxation, screws with a large head support are used in many applications. However, particularly for light metals, friction values often are so high that the desired preload forces are not achieved (see red lines in diagram). With the use of RIPP LOCK® lock washers which only allow a relative movement between screw head and washer,...

Material Steel Hardness 400-500 HV Surface Zinc flake 480 h *The production and hardening process can have an influence on the corrosion behavior.

RIPP LOCK® lock screws and nuts Special advantages n Reliable fastening connections, no additional elements required n Increased contact area makes washers and spring washers unnecessary n Rounded locking ribs enable corrosion protection to be largely maintained at the fastening points, since the fastening does not damage the surface n Reduced setting values for the screws because of cold working of the clamped materials n Good tightening characteristics, excellent reusability Because the ribs do not dig into the surface in the release direction, the fastening is gentle to sensitive surfaces....

RIPP LOCK® self-locking screws and nuts are available as: ■ Hexagon socket self-locking screws, property class 100 ■ Hexagon head self-locking screws, property class 100 ■ Hexagon head self-locking nuts, property class 10 For self-locking screws with hexagon socket heads, the head heights and hexagon sizes are identical to those for DIN 912 screws. To achieve a greater contact area the head diameter is slightly increased. This results in a reduced surface pressure. ■ Self-locking nuts 10: for screws up to property class 10.9 and screw class 100 ■ Property classes 12.9 and 12 available on request...

Counterbore dimensions The counterbore dimensions for fitting these screws are set out in DIN 74, part 2. The diagram below shows the fastening behaviour of screws in a shake test. The dashed line shows the behaviour of an unlocked screw, the continuous lines the behaviour of screws with spring washers to DIN 127 and serrated lock washers to DIN 6798. The blue line indicates the behaviour of a screw with locking teeth or locking ribs. (see also page 3 - Junkers vibration test of RIPP LOCK® washers)

Technical information 0L RIPP LOCK® lock nuts, strength class 10 OAll RIPP LOCK® lock nuts comply with ELV, RoHs and WEEE directives and are thus Cr(VI)-free. Further surfaces and dimensions on request.

Technical information RIPP LOCK® lock screws, strength class 100 OAll RIPP LOCK® lock screws comply with ELV, RoHs and WEEE directives and are thus Cr(VI)-free. Further surfaces and dimensions on request.

Technical information I— di—I RIPP LOCK® lock screws, strength class 100, zinc plated

Technical information l— di—I RIPP LOCK® lock screws with hexagon socket, strength class 100 OAll RIPP LOCK® lock screws comply with ELV, RoHs and WEEE directives and are thus Cr(VI)-free. Further surfaces and dimensions on request.

RIPP LOCK® lock screws with hexagon socket, strength class 100, zinc plated M 5 OAll RIPP LOCK® lock screws comply with ELV, RoHs and WEEE directives and are thus Cr(VI)-free.

RIPP LOCK® lock screws and nuts – Approvals General technical approval Registration number: Z-14.4-664 Object of approval: Bolted connection with RIPP LOCK® screw lock washers The general technical approval verifies the screw-locking performance of the RIPP LOCK® washers in accordance with state building regulation. RIPP LOCK® washers are tested and approved to secure the bolted connection, suitable even under high dynamic loads and under extreme vibration.

Böllhoff Group Innovative partner for joining technology with assembly and logistics solutions. Find your local partner at www.boellhoff.com or contact us at [email protected]. Passion for successful joining. Subject to technical change. Reprinting, even in extract form, only permitted with express consent. Observe protective note according to ISO 16016.