40-XTC-BD-AE Rotor Complete
Extra-narrow XTC rotor complete for closely controlled fine yarns (Ne 16–40) on the Rieter R40 fully automatic platform. BD two-layer build: hardened substrate, diamond face. Dimensionally identical to the original part and supplied at 40–60% below OEM price, with balancing verified on our own line.
40-XTC-BD-AE — Complete Specifications
All measurements in millimetres. Every rotor complete assembly is 100% dynamically balanced on our own balancing line before shipment.
Why XTC Groove for Compact Fine Yarn
XTC takes the narrow idea one step further. The extra-narrow groove concentrates the fibre ribbon harder, which is what compact, closely controlled fine yarns need. The group is stocked across several cup sizes, which lets a mill shift counts without changing the spinning-box setup.
XTC Groove — Applicable Yarn Count Range
Fine, appearance-critical yarns are the design point. Coarse counts need the GL profile instead. Mills usually run a sample first to verify the groove on the machine before a bulk order.
XTC Groove — Compact Fine Yarn, Controlled Placement
Every millimetre removed from the groove tightens deposition. XTC uses that to keep fibre placement exact across Ne 16–40, which is where compact yarns are judged: fewer thin places, a smoother face and more consistent appearance between doffs. This is the profile to test on a sample rotor before committing a full order.
Fewer Appearance Faults
The narrow zone suppresses the thin and thick places that show up immediately in fine knitted fabric.
Smooth Yarn Face
Precise fibre placement at insertion produces the smooth surface compact yarns are bought for.
Stable on Variable Raw Material
A tight, clean cross-section keeps the fibre ring steady even when the cotton lot changes.
Best Above Ne 20
The tighter the zone, the finer the count it suits — this profile is aimed at the top of the Ne 16–40 band.
What BD 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. B and D do different jobs — B hardens the base, D takes the wear. Tell us your fibre and the speed you run and we confirm both before a bulk order. Standard lead time on coated rotors is 7–15 days, with urgent orders on request.
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.
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-XTC-BD-AE?
R40-AE is the bearing standard for this rotor on the Rieter R40 spinning box. A rotor from another group will not seat correctly.
What to Spin with 40-XTC-BD-AE
How this rotor is normally applied on Rieter R40 machines, with the XTC groove’s published count window where the catalogue documents one.
✓ Fine knitting yarns where appearance is the selling point
✓ Mills running a narrow, strictly controlled count schedule
✓ Work where standard profiles are not tight enough
◇ Medium counts Ne 16–30 — G standard or U general purpose
◇ Less exacting fine counts — XT / T narrow groove
◇ Blends and speciality fibres — S groove
→ See all 9 Rieter R40 rotor models →
40-XTC-BD-AE — 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-XTC-BD-AE compatible with my Rieter R40 machine?
What does the model code 40-XTC-BD-AE mean?
What yarn counts does the XTC groove suit?
What do the letters BD mean in the model code 40-XTC-BD-AE?
How much does an OEM-equivalent rotor save versus the original?
Can I order the rotor spindle or rotor cup separately?
Order 40-XTC-BD-AE Rotors
Pre-filled: 40-XTC-BD-AE · Rieter R40 · boronized base + 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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