Finished Bore Sprocket FBK80B

Finished Bore Sprocket FBK80B

The FBK80B finished bore sprocket (25.400 mm pitch) arrives pre-machined to your specified shaft diameter — eliminating on-site boring, reducing installation time, and ensuring a precision-fit bore that prevents fretting and hub loosening. Manufactured from C45 carbon steel with hardened teeth (HRC 50–60) and a 120° keyway position, it covers Z=9–23 and is the fastest path from order to running for Australian maintenance teams.

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Description

FBK80B Finished Bore Sprocket

Technical Specifications — FBK80B Finished Bore Sprocket

پارامتر ارزش یادداشت‌ها
Model FBK80B Asian Standard FBK/FBN Series
گام 25.400 mm
Tooth Width (T) 14.6 mm
محدوده دندان‌ها Z=9–23
Hub Style B Type (finished bore, pre-machined)
محدوده سوراخ To your specification Keyway standard; specify shaft dia.
مواد فولاد کربنی C45
سختی دندان HRC 50–60 سخت کاری القایی
Bore Tolerance H7 Standard fit; H6 on request
Keyway Standard 120° position DIN 6885 keys

ویژگی‌های کلیدی

⚡ Ready-to-Install
Pre-machined bore to H7 tolerance eliminates on-site boring — simply align, key, and run. Saves 1–3 hours of workshop time per sprocket replacement.
H7 Bore Precision
CNC-bored to H7 tolerance (ISO 286) with surface finish Ra 1.6 µm — ensuring a precision shaft fit that prevents fretting, micro-movement, and hub fatigue failure.
Standard Keyway Included
DIN 6885 keyway pre-cut at the 120° position; set-screw hole tapped and included. No additional machining required.
Fast Dispatch on Standard Sizes
Standard bore finishes are available from stock for immediate dispatch. Specify your bore diameter — most are produced within 3–5 days.

کاربردها

Conveyor Maintenance

Conveyor Maintenance
Quick sprocket replacement on conveyor drives without on-site boring capability
Agricultural Drives

Agricultural Drives
End-of-season sprocket replacement on harvester and planter drives
تعمیر و نگهداری کارخانه

تعمیر و نگهداری کارخانه
Rapid sprocket changeout in remote locations without machine shop access
Production Lines

Production Lines
Minimise production downtime with pre-machined finished bore replacement sprockets

نظرات مشتریان

Shane D.  ★★★★★   استرالیا
“Finished bore FBK80B sprockets let our maintenance crew swap sprockets without calling in the machinist — cut our maintenance window from 4 hours to 45 minutes.”
FBK80B Z=15 30mm bore · March 2025
Magnus L.  ★★★★★   Sweden
“H7 bore tolerance was confirmed by our QA team using plug gauges — spot on. Shaft fit is perfect without any shimming.”
FBK80B Z=19 45mm bore · February 2025
Karen P.  ★★★★☆   New Zealand
“Good product, arrived as specified. Would appreciate a broader standard bore size range stocked from inventory.”
FBK80B Z=12 28mm bore · January 2025
Tomás R.  ★★★★★   Portugal
“For our maintenance team, pre-finished bore sprockets are invaluable. These are consistently bored to tolerance and deliver fast.”
FBK80B Z=18 35mm bore · April 2025

سوالات متداول

►  How do I specify a finished bore sprocket?
Specify: model number, tooth count (Z), shaft diameter, bore tolerance (H7 standard), keyway dimensions (or ‘no keyway’), and whether a set-screw is required.
►  What is the minimum bore diameter available?
Minimum bore depends on tooth count — for small tooth counts, hub wall thickness limits the minimum. Contact us with your tooth count and required bore to confirm feasibility.
►  Can you bore to a non-standard tolerance (e.g. H6 or j6)?
Yes. H6, H5, and special fit tolerances are available on request with 2–3 extra days for precision boring. Specify the required tolerance at order.
►  Do you include the key with the sprocket?
A DIN 6885 key sized to fit the keyway is included with most finished bore sprockets. Please confirm at order if a key is required.
►  Is there an additional cost for the finished bore machining?
Finished bore versions carry a modest machining surcharge over stock-bore prices. Contact us for a precise quote based on tooth count and bore diameter.
  1. Verify shaft is clean, within tolerance, and free of burrs before assembly.
  2. Slide sprocket onto shaft (H7/k6 slip or light press fit); align keyway and insert key.
  3. Tighten set-screw to the hub marking torque specification.
  4. Align with mating sprocket; install chain and adjust tension.
  5. Check bore for any fretting marks after first 100 hours — if fretting is present, check shaft diameter and fit tolerance.
✓ ایزو ۹۰۰۱:۲۰۱۵✓ استاندارد ANSI B29.1✓ استاندارد ISO/DIN 8187✓ استاندارد JIS B 1801✓ استانداردهای BS/DIN✓ استانداردهای بریتانیا
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