NM 67 柔性爪式联轴器
NM 67 reference model with 8-28 mm bore range, 10000 rpm maximum reference speed, and forged-iron hub construction shown in the supplied reference page. Final bore, keyway and duty require confirmation.
NM 67 expands the reference bore range to 8-28 mm while keeping a 67 mm outside diameter. The supplied table lists 2.2 Kg*m normal torque, 4 Kg*m maximum torque, a 10,000 rpm maximum reference speed and an approximate 1.02 kg weight. It is a useful comparison point when NM 50 is too small for the shaft but the installation still favors a compact hub envelope.
- Upper reference bore 28 mm
- Maximum reference speed 10000 rpm
- Approximate table weight 1.02 kg
- Two shaft interfaces can be different
- Element compound must be confirmed for environment
Step-Up Size Review
The row below is a matching reference for NM 67. It is intentionally separated from the application review because a model-table match does not by itself establish service suitability.
| 模型 | 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 67 | 2.2 | 4 | 10000 | 8 | 28 | 46 | 67 | 30 | 2.5±0.5 | 1.02 |
Hub And Element Layout
The NM 67 reference construction is a two-hub jaw arrangement with a flexible element between the hubs. The source illustration labels the hub as forged iron. For purchasing, the material label should be separated from the unverified element specification: the provided model table does not state the elastomer grade. If the coupling operates near oil mist, heat, washdown chemicals or frequent cycling, describe those conditions so the element can be reviewed deliberately.
Shaft First Selection
On NM 67, shaft diameter often becomes the early gate. Check the larger of the two shafts against the 28 mm reference maximum, then examine the required keyway and the remaining hub section. After geometry, calculate or provide the real transmitted torque and compare the running speed with the reference limit. A shaft that fits does not prove that the torque duty fits, and a torque value that looks low does not prove the requested bore can be machined safely.
Assembly Control
A practical NM 67 installation plan should define where each hub stops on its shaft, how the keys are retained and how the coupling space will be measured. Align the driver and driven machine before using the flexible element to bridge the hubs. During commissioning, listen for cyclic noise and check for heating or visible element deformation. Those symptoms should trigger an alignment and duty review rather than an automatic assumption that the element material is defective.
Candidate Equipment
This model may be considered in compact pump, compressor, conveyor or general machinery layouts when the shafts fall within the reference bore window. Selection should still use the actual drive data. Frequent starts, reversing, pulsating load or unusual ambient conditions can change the service requirement even when the continuous motor power seems modest. Send the machine duty and start pattern with the RFQ.
Drawing-Based Options
For NM 67, custom machining can be evaluated for finished bores, keys and project identification. When one shaft is much larger than the other, show both sides separately on the drawing so a symmetric hub assumption does not enter production. Special finishes or packing instructions can be added to the order once the functional dimensions are approved.
Quote Inputs
State whether the requirement is a sample match, a new-machine build or a repeat batch. Mixed NM models can be combined for commercial review, with USD 1,500 used as the site order-value target. Special processes remain subject to practical batch size.
Frequently Asked Questions
When is NM 67 worth comparing with NM 50?
NM 67 extends the listed bore capacity to 28 mm and raises the reference torque figures. Compare it when the smaller frame cannot accommodate the shaft or duty, while still checking the actual installation envelope.
Do the two NM 67 hubs need the same bore?
Not necessarily. Driver and driven shafts can differ. State each shaft and key separately so the quotation does not assume a symmetric pair.
How should a 10,000 rpm application be described?
Provide the actual running speed, start pattern, bore details and any balance requirement. The table value is a reference maximum, not a blanket operating recommendation.
Can surface treatment be added?
A finish request can be evaluated after the shaft interfaces and hub geometry are confirmed. Special processes may have their own practical batch requirement.
Request NM 67 Review
Please include both shaft dimensions, motor power and speed or torque, quantity and application.
