Finished Bore Sprocket FBN100B / FBN120B

Finished Bore Sprocket FBN100B / FBN120B

The FBN100B / FBN120B finished bore sprocket (31.75 / 38.10 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=9–21 and is the fastest path from order to running for Australian maintenance teams.

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Description

FBN100B / FBN120B Finished Bore Sprocket

Technical Specifications — FBN100B / FBN120B Finished Bore Sprocket

Parameter Value Anmerkungen
Model FBN100B / FBN120B Asian Standard FBK/FBN Series
Tonhöhe 31.75 / 38.10 mm
Tooth Width (T) 17.6 / 22.6 mm
Teeth Range Z=9–21
Hub-Stil B Type (finished bore, pre-machined)
Bore Range To your specification Keyway standard; specify shaft dia.
Material C45 Carbon Steel
Zahnhärte HRC 50–60 Induction hardened
Bohrungstoleranz H7 Standard fit; H6 on request
Keyway Standard 120° position DIN 6885 keys

Key Features

⚡ 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.

Applications

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
Plant Maintenance

Plant Maintenance
Rapid sprocket changeout in remote locations without machine shop access
Production Lines

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

Customer Reviews

Shane D.  ★★★★★   Australia
“Finished bore FBN100B / FBN120B sprockets let our maintenance crew swap sprockets without calling in the machinist — cut our maintenance window from 4 hours to 45 minutes.”
FBN100B / FBN120B 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.”
FBN100B / FBN120B 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.”
FBN100B / FBN120B 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.”
FBN100B / FBN120B Z=18 35mm bore · April 2025

FAQ

►  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.
✓ ISO 9001:2015✓ ANSI B29.1✓ ISO/DIN 8187✓ JIS B 1801✓ BS/DIN Standards✓ GB Standards
Immer-Energie-Fabrik

Warum Ever-power Australia wählen?

We are a vertically integrated manufacturer with over 25 years of chain drive experience. Our facility spans 35,000 m² and produces over 4 million sprockets per year. We supply OEM partners, distributors, and direct industrial buyers across Australia, with products meeting GB, ISO, ANSI, JIS, DIN and BS standards.

ISO 9001 Certified
4M+ pcs/year
OEM-fähig
AU Stock Available

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