46-XTC-BD-EC Rotor Complete
Extra-narrow rotor complete for compact, appearance-critical 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.
46-XTC-BD-EC — 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
Extra-narrow geometry is for mills that judge a rotor on yarn appearance: XTC holds the deposition zone tight so fibre placement stays exact at the top of the count range. Rotors in this group share that groove and differ by cup diameter, so the groove can stay constant while the count moves.
XTC Groove — Applicable Yarn Count Range
Fine, appearance-critical yarns are the design point. Coarse counts need the GL profile instead. Groove and cup size are confirmed together when the order is placed.
XTC Groove — Precision at the Fine End
Because the deposition zone is so tight, the XTC rotor holds a stable fibre ring even when the raw material varies. Mills running compact fine counts use it to keep yarn appearance predictable order after order. 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. This code is a two-layer build: B puts a boronized (boron-steel) substrate under the film, D is the diamond top layer. The base is what stops fibre impact from deforming the rotor and cracking the coating. 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.
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 46-XTC-BD-EC?
The R40-EC bearing locks this rotor to the Rieter R40 platform. Rotors from a different bearing group will not interchange, however similar the cup looks.
What to Spin with 46-XTC-BD-EC
Typical operating profile for the XTC groove on the Rieter R40 fully automatic platform. Groove count windows follow the catalogue data.
✓ 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
◇ Less exacting fine counts — XT / T narrow groove
◇ Blends and speciality fibres — S groove
◇ Coarse counts Ne 3–16 — GL groove
→ See all 4 Rieter R40 rotor models →
46-XTC-BD-EC — 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 46-XTC-BD-EC compatible with my Rieter R40 machine?
What does the model code 46-XTC-BD-EC mean?
What yarn counts does the XTC groove suit?
What do the letters BD mean in the model code 46-XTC-BD-EC?
How much does an OEM-equivalent rotor save versus the original?
Can I order the rotor spindle or rotor cup separately?
Order 46-XTC-BD-EC Rotors
Pre-filled: 46-XTC-BD-EC · Rieter R40 · boronized base + diamond coating
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