RODOGRIP®
RODOGRIP® precision locknuts are compact, high-strength locking elements designed to secure bearings and mechanical components on threaded shafts with high positioning accuracy and axial stability.
Distinctive feature
RODOGRIP® locknuts integrate a built-in radial locking system that allows secure fastening on threaded shafts without deformation of either the nut or the shaft. Their compact design ensures high locking performance in limited space conditions, making them particularly suitable for precision mechanical assemblies and drive systems.
Applications
RODOGRIP® precision locknuts are widely used in machine tool construction, particularly in spindle assemblies, drive systems, and precision transmission units. They are also employed for axial positioning and preload adjustment of bearings, including axial and tapered roller bearings, either individually or in combined arrangements.
Additional applications include:
- ball screw assemblies
- pulleys and belt drive systems
- torque-limiting couplings
- precision mechanical positioning systems
Advantages
RODOGRIP® locknuts provide a compact, reliable and highly accurate locking solution for threaded shafts.
Key advantages include:
- no need for additional locking devices or shaft keyways
- high positioning accuracy and repeatability
- no deformation or marking of shaft threads
- quick and precise installation and adjustment
- secure gripping action even under dynamic loads
- low tightening torque required for stable locking
- precise axial preload adjustment of bearing systems
Operating principle
RODOGRIP® locknuts are screwed onto the shaft to the required axial position and then locked through a set of high-strength radial grub screws positioned on the outer circumference of the nut. When tightened, the screws act on internal brass pressure elements, which transmit a controlled clamping force onto the threaded shaft.
The geometry of the brass elements is specifically designed to match the thread profile of both the nut and the shaft, ensuring uniform load distribution. This locking mechanism guarantees a secure and permanent grip without damaging the shaft threads, without deformation of the nut body, and without risk of loosening under vibration or dynamic loads.
Technical description
RODOGRIP® precision locknuts are manufactured with high machining accuracy, ensuring super-finished threads and contact surfaces without the need for post-processing.
Flatness and perpendicularity of the contact face are guaranteed within tight tolerances (up to 0.002 mm, 0.005 mm from size M85 upwards), ensuring optimal axial load distribution and stability. The locking system is based on radial grub screws acting on internal brass pressure elements, designed to transmit force uniformly without damaging the shaft surface.
Standard production covers thread sizes from M10x0.75 up to M200x3, with special executions available up to M215x4.
Material options include:
- standard steel versions
- stainless steel AISI 303 variants for corrosive environments
- left-hand thread configurations
- radial and axial locking versions
Surface finishing includes burnishing and protective oiling to ensure corrosion resistance and smooth assembly.
The product range includes both radial and axial locking series, optimized for different mechanical constraints:
Radial locking series:
- ANS / PNS (3-point locking)
- ANSK / PNSK (2-point locking)
- ANSL (left-hand thread versions)
- ANSI (stainless steel AISI 303)
- ANSB / PNST (wide series variants)
Axial locking series:
- ANSA (3 or 6 locking points)
- PNSA (3-point locking)
- PNSAC (screw-assisted locking configuration)
| Serraggio Tightening Serrage | Forma Shape Forme | Taglie Sizes Tailles | ||
|---|---|---|---|---|
 | ANS / PNS | 3 x radial | stretta narrow étroite | da M10 a M200 |
 | ANSB | 3 x radial | larga wide épaisse | da M15 a M80 |
 | ANSK / PNSK | 2 x radial | dia. est. ridotto small ext. dia dia. ext. réduit | da M10 a M80 |
 | ANSI | 3 x radial | inossidabile stainless inoxydable | da M10 a M60 |
 | PNST | 3 x semi-radial | larga wide épaisse | da M17 a M200 |
 | PNSA | 3 x axial | larga wide épaisse | da M17 a M200 |
 | PNSAC | 3 x axial | larga wide épaisse | da M16 a M200 |
 | ANSA | 3 x axial | alto bloccaggio high grip haut rendement | da M10 a M80 |
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