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LOCK B 15 Low Resistance Locking LOCK R 25 Medium Resistance Locking LOCK V 29 High Resistance Locking
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Mechanical fasteners by threaded joints
Inadequate tightening torque,
Inadequate geometric ratios,
Differences in the grades of the materials,
Frequent variations in the temperature or load,
Joints subject to vibrations or shocks
are all factors that lead to stress relaxation in metal, loss of tension, and loosening of the threaded joints
LOCK B 15 BLUE
Low resistance for easy disassembly with all common manual tools, loosening torque 15 N/m
LOCK R 25 RED
Medium resistance for disassembly with all standard professional tools, loosening torque
25 N/m
LOCK V 29 GREEN
High resistance for disassembly with suitable tools or after sublimation phase at +250°C temperature, loosening torque 29 N/m
LOCK threaded locks ensure a constant holding force, even during mechanised tightening at an angle, at the screw's elastic limit,
Fills the voids regardless of the roughness of the contact surfaces,
Consequently ensures the tightness of the joints,
Prevents oxidation generated by external agents,
and corrosion of surface tribo-contacts (Hertzian contacts) generated by vibratory phenomena causing Pitting
Choose a threaded lock
- Depending on the desired ease or resistance to loosening
- Depending on the temperature
- Depending on the grade of the steel in contact
- Depending on the external agents in contact with the joints, oil, glycols, solvents, etc.
Many recognised producers or Trading Companies have always, for marketing reasons, employed a single formula to multiple product references to "specialise" their range.
Considering the multitude of specific products and colour codes, the LOCK range simplifies the choice, purchasing and management of your inventory.
The 3 LOCK products meet every need.
Basic concepts on tightening torques
While the clamping precision class is small (Class D) in industrial maintenance, the same does not apply in mechanical engineering.
This simple reminder of the calculation of tightening torques comes from standard NF E 25.030.1 Screwed Fastener Joints (ISO 898 1&2 and ISO 3506 1&2)
The necessary dimensional and mechanical data to know are:
- Diameter of the screw
- Diameter of the through hole
- Thread pitch
- Side on flat of nut
- Constraint rate
- Class (tightening quality) desired
The necessary dynamic values to know are:
- Tightening torque
- Equivalent resistant section
- Initial tension in the screw
The friction coefficient value is generally determined by the lubrication of the joint
- μ 0.10 adapted lubrication
- μ 0.15 summary lubrication
- μ 0.20 dry mounting
Advantageously, the thread locks replace the lubricants, but above all, prevent the joint becoming unscrewed. A threadlock cannot be used in the case of very high temperatures over 250°C and up to temperature extremes of 1200°C. Then it must be replaced by joint pastes and aluminium, copper, nickel or ceramic joints.
The desired clamping precision class also depends on the material used
| CLASS A (under 5%) | Electronic torque wrenches |
| CLASS B (5 to 10 %) | Self-setting, self-resetting, load-sensing torque wrenches |
| CLASS C (10 to 20%) | Keys, hydraulic screwdrivers, single-acting torque wrenches, single screwdrivers, pneumatic, electric |
| CLASS D (20 to 50%) | Single impact wrenches, jaw screwdrivers, simple manual tooling |
The choice of loosening resistance depends on
the performance needs, on the suitable material
and time available.
Made in France
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