31-XT-BD-AE1 Rotor Complete
Narrow-groove rotor complete for fine and medium-fine yarns (Ne 16–40) on the Rieter R60 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.
31-XT-BD-AE1 — Complete Specifications
All measurements in millimetres. Every rotor complete assembly is 100% dynamically balanced on our own balancing line before shipment.
Why XT Groove for Fine Yarn
T-profile rotors run a narrow groove for a reason: at fine counts the fibre ribbon is thin, and a tighter deposition zone keeps it under control through twist insertion. The group is stocked across several cup sizes, which lets a mill shift counts without changing the spinning-box setup.
XT Groove — Applicable Yarn Count Range
Best kept inside Ne 16–40. If the schedule runs coarser than Ne 16, the U or GL groove will run more comfortably. Mills usually run a sample first to verify the groove on the machine before a bulk order.
XT Groove — Where Fine Counts Are Decided
At fine counts every extra millimetre of groove width costs yarn quality. The narrow T profile keeps the fibre ribbon tight against the groove wall, giving uniform twist propagation and a smoother yarn surface. Evenness, not operating width, is what a narrow profile is bought for.
Lower Break Rate
Smoother twist propagation at fine counts cuts the tension peaks that break ends at high rotor speeds.
Resists Micro-Dust
A compact, smooth cross-section leaves fewer pockets for micro-dust, so fault frequency stays flat over a long doff.
Thin-Place Reduction
Control of the deposition zone directly limits the thin places that downgrade fine knitting yarn.
Smooth Yarn Surface
Even fibre distribution at insertion gives a smoother yarn face — the property that decides how fine knits look and feel.
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 31-XT-BD-AE1?
R60-AE1 is the bearing standard for this rotor on the Rieter R60 spinning box. A rotor from another group will not seat correctly.
What to Spin with 31-XT-BD-AE1
How this rotor is normally applied on Rieter R60 machines, with the XT groove’s published count window where the catalogue documents one.
✓ Mills whose count schedule sits above Ne 20
✓ Narrow-profile spinning where evenness is the priority
✓ Fully automatic platforms running fine-count delivery
◇ Coarse counts Ne 3–16 — GL groove
◇ Extremely fine compact counts — XTC extra-narrow groove
◇ Abrasive or recycled fibre — DN diamond coating
→ GL: Large (Ne 3–16)
→ G: Standard (Ne 16–40)
→ T: Narrow (Ne 16–40) — this model
→ TT: Extra narrow (Ne 16–40)
→ S: Special (Ne 16–40)
→ See all 7 Rieter R60 rotor models →
31-XT-BD-AE1 — 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 31-XT-BD-AE1 compatible with my Rieter R60 machine?
What does the model code 31-XT-BD-AE1 mean?
What yarn counts does the XT groove suit?
What do the letters BD mean in the model code 31-XT-BD-AE1?
How much does an OEM-equivalent rotor save versus the original?
Can I order the rotor spindle or rotor cup separately?
Order 31-XT-BD-AE1 Rotors
Pre-filled: 31-XT-BD-AE1 · Rieter R60 · 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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