Accouplement à mâchoires flexibles NM 128
NM 128 reference model with 18-55 mm bore range, 5000 rpm maximum reference speed, and forged-iron hub construction shown in the supplied reference page. Final bore, keyway and duty require confirmation.
NM 128 raises the supplied reference figures to 26.7 Kg*m normal torque and 48 Kg*m maximum torque while listing 5,000 rpm maximum speed. The documented bore range is 18-55 mm, outside diameter 128 mm, distance L 70 mm and approximate weight 8.10 kg. As loads increase, the starting event and driven inertia deserve more attention during model review.
- Bore capacity up to 55 mm
- Reference weight 8.10 kg
- Outside diameter 128 mm
- Starting inertia deserves explicit review
- Structural changes need revised approval
Medium-Duty Review
This NM 128 table is a reference snapshot, useful for comparing torque, speed, bore and envelope at one glance. It is not a stand-alone sizing certificate for an unknown machine.
| Modèle | Normal Torque (Kg*m) | Max Torque (Kg*m) | Max RPM | Bore Min (mm) | Bore Max (mm) | Boss D (mm) | Outside OD (mm) | Distance L (mm) | Space S (mm) | Approx. Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|
| NM 128 | 26.7 | 48 | 5000 | 18 | 55 | 90 | 128 | 70 | 3.5±1.0 | 8.10 |
Element Interface
For NM 128, the basic assembly remains two jawed hubs with the flexible element working between them. The source page labels the hubs as forged iron. The center element should be treated as an application item because its specific material is not stated in the supplied table. Include operating temperature and contamination exposure if the drive is in a compressor room, washdown area or other demanding environment.
Starting Load Check
A useful NM 128 calculation distinguishes steady running torque from the peak caused by acceleration, process shock or jam events. Provide both values when available. Then verify shaft sizes, keyways and the 5,000 rpm reference ceiling. If the machine starts under load, give the driven inertia or at least describe the start condition so the engineer can judge whether a service margin is needed.
Handling And Alignment
The 8.10 kg reference weight means handling and hub support should be planned rather than left to the flexible element. Keep shafts clean and supported, set the hub locations from the drawing, align the equipment and only then install the center member. A post-start inspection should check temperature, vibration, element compression pattern and any witness marks showing hub movement on the shaft.
Industrial Duty
This size can be evaluated for medium industrial drives such as pumps, air-handling equipment, compressors, conveyors or process machinery when the application inputs agree with the reference data. Where torque fluctuates, send a duty description or cycle profile. That information is more useful than simply naming the motor frame or machine category.
Geometry Changes
NM 128 custom work should begin with the functional shaft interfaces: bore, key, fit and axial retention. Special marking, surface treatment or packaging can follow. If a nonstandard hub change affects the distance L or other envelope dimension, require a revised approval drawing rather than assuming the reference dimensions still apply.
Commercial Planning
Specify quantity by shaft combination and identify whether inspection reports or special marking are required. A 1-5 pcs sample request can be evaluated at sample pricing. Larger mixed-model orders can be reviewed together, while process-specific minimums still apply to special finishes or materials.
Frequently Asked Questions
Why is starting load important for NM 128?
At this size, acceleration of the driven inertia or loaded starts can make transient torque materially different from steady torque. Describe the start condition rather than sending only motor power.
How should the approximately 8.10 kg weight be used?
It is reference data from the supplied table. Use it for preliminary handling planning only; the finished bore and exact delivered configuration should be verified for the final part.
What happens if a custom hub dimension changes?
Request a revised approval drawing. Once hub length or structural geometry changes, do not assume every reference-table dimension still applies.
Can low quantities be quoted?
Yes for evaluation, but machining setup and special processing remain real costs. New-client 1-5 pcs samples can be reviewed at sample pricing.
Request NM 128 Review
Please include both shaft dimensions, motor power and speed or torque, quantity and application.
