40-N-D Rotor Complete
N-groove rotor complete for counts confirmed per order on the Rieter R1, R20, R40 and R60 fully automatic platform. Diamond top layer on the prepared substrate. Every assembly is dynamically balanced and vibration-checked before shipment, at 40–60% below the OEM part price.
40-N-D — Complete Specifications
All measurements in millimetres. Every rotor complete assembly is 100% dynamically balanced on our own balancing line before shipment.
Why N Groove for Application-Specific Spinning
The N groove sits outside the standard count-band families: no fixed Ne window is published for it in our catalogue data, so the rotor is specified against the application. The group is stocked across several cup sizes, which lets a mill shift counts without changing the spinning-box setup.
N Groove — Yarn Count Range
The count band is confirmed per order. Include your target Ne and fibre type with the enquiry. Groove and cup size are confirmed together when the order is placed.
N Groove — Count Confirmed Before the Order
No fixed count window is published for the N groove, so this rotor is quoted on the application: fibre type, target Ne and spinning position. Our engineers confirm the groove, cup size and coating together, and the order is released on that confirmed selection. Tell us the fibre and the target count and the rotor is selected on that basis.
Defined Bearing Group
The rotor belongs to a specific bearing group, so machine compatibility is unambiguous.
Quotation on the Confirmed Rotor
Price and lead time follow the confirmed selection.
Count Matched to Your Application
Selection is checked against your fibre, target count and spinning position.
Engineer-Confirmed Selection
Groove, cup size and coating are confirmed together before the order is released.
What D Means: Base and Working Surface
The trailing letters of the model code are two independent codes, not one word: B is the substrate, D is the working surface. Diamond top layer (HV 1000-1200) with a friction coefficient of 0.05–0.1, which reduces fibre damage at the groove face. Every assembly is 100% dynamically balanced before it leaves the balancing line.
B = boronized (boron-steel) substrate. A diamond film is only microns thick, so the steel underneath decides whether it survives: a soft substrate deforms under fibre and grit impact and the film cracks and spalls off. The boronized base is the hardening step that keeps the diamond layer intact. This code does not carry the B step; it is the -BD- variant that pairs the diamond layer with the boronized base.
D = diamond top layer, grown on the prepared substrate as a micron-scale film. It takes the fibre and grit contact directly, which is where the wear resistance, the friction coefficient of 0.05–0.1 and the anti-stick behaviour come from that hold the groove profile over long runs. Diamond coating technology of US origin, applied on JSM’s own treatment line.
Which Rieter Machines Use 40-N-D?
Bearing fit comes first — here the R20 Twin Disc bearing, common to the Rieter R1, R20, R40 and R60 series. A rotor from another bearing group will not seat correctly, however similar the cup looks.
What to Spin with 40-N-D
How this rotor is normally applied on Rieter R1, R20, R40 and R60 machines, with the N groove’s published count window where the catalogue documents one.
✓ Applications outside the standard published count bands
✓ Mills needing the count confirmed before ordering
✓ Replacement rotors at a known spinning position
◇ Standard fine counts Ne 16–40 — T family, published window
◇ Medium–coarse counts Ne 10–30 — U general-purpose groove
◇ Blends and speciality fibres — S groove
→ U: General purpose (Ne 10–30)
→ GL: Large (Ne 3–16)
→ G: Standard (Ne 16–40)
→ T: Narrow (Ne 16–40)
→ TT: Extra narrow (Ne 16–40)
→ S: Special (Ne 16–40)
→ See all 6 Rieter R1, R20, R40 and R60 rotor models →
40-N-D — Frequently Asked Questions
Answers to the questions buyers ask most often about this rotor. If yours is not listed, send it with your machine model and current rotor code — we reply within 24 hours.
Is 40-N-D compatible with my Rieter R1, R20, R40 and R60 machine?
What does the model code 40-N-D mean?
What yarn counts does the N groove suit?
What do the letters BD mean in the model code 40-N-D?
How much does an OEM-equivalent rotor save versus the original?
Can I order the rotor spindle or rotor cup separately?
Order 40-N-D Rotors
Pre-filled: 40-N-D · Rieter R1 / R20 / R40 / R60 · diamond coating
Tell us your quantity and we respond with pricing, lead time and freight options within 24 hours. Sample orders welcome.
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