Decode H/B nomenclature
Type code segments such as B3SH11A16 are translated into gear arrangement, stage count, shaft form, mounting, size, and ratio.
Drop-In Replacement
Replacement for Flender H/B Series Gear Units
Heavy industrial replacement review for Flender H-series parallel shaft and B-series bevel-helical gear units used in mining, cement, ports, water treatment, and bulk material handling.
For maintenance and procurement teams facing long OEM lead times, high repair cost, or urgent shutdown risk on heavy-duty gear units.
Replacement Scope
Competitor Families We Screen First
| Family | Common Examples | Equivalent Path | Review Notes |
|---|---|---|---|
| H Series Parallel Shaft Gear Units | H1SH, H2SH, H3SH, H4SH horizontal and vertical layouts | H-Heavy parallel shaft replacement | Validate center distance, shaft height, oil volume, bearing load, fan cooling, and foundation footprint. |
| B Series Bevel-Helical Gear Units | B2SH, B3SH, B3HH, B4SH right-angle layouts | B-Heavy bevel-helical replacement | Confirm bevel stage orientation, solid/hollow output, nominal ratio, thermal rating, and service factor. |
| FZG / Large Industrial Drives | Project-specific reducer assemblies and legacy nameplates | Drawing-led engineered replacement | Use site photos and foundation drawings when the original model code is incomplete. |
Qualification Checks
- Full Flender type code, ratio, mounting position, and size
- Input/output shaft dimensions, shaft heights, and rotation direction
- Driven machine load profile and daily operating hours
- Cooling method, ambient temperature, and oil/lubrication constraints
- Existing foundation drawing and installation clearance
RFQ Checklist
- Send Flender model code and photos from all nameplates
- Provide foundation, shaft, coupling, and driven-machine drawings
- State load cycle, motor power, input speed, and ambient temperature
- List shutdown window, delivery deadline, and inspection documents needed
Engineering Review Workflow
Replacement projects are screened in a fixed order so the quote does not hide mechanical, thermal, or validation risk.
Check foundation and shaft geometry
Heavy gear units fail as replacements when shaft height, center distance, or base holes are off. These are reviewed before performance claims.
Confirm thermal capacity
Continuous-duty industrial drives are screened for oil capacity, cooling path, ambient heat, and service factor before final model selection.
Recommended Product and OEM Paths
H-Series Helical GearboxParallel shaft heavy-duty option for conveyors, presses, and industrial drives.B-Series Bevel-Helical GearboxRight-angle heavy-duty option for kilns, bucket elevators, and crushers.Gearbox Load and Life ValidationUse when uptime, heat rise, and bearing life are the main risks.
Buyer FAQ
Can you replace a legacy Flender unit with incomplete documentation?
Often yes, but we need site photos, critical dimensions, and application data to rebuild the missing specification safely.
Is a torque-equivalent H/B replacement enough?
No. Heavy industrial replacements must also match shaft geometry, foundation, cooling, bearing load, oil volume, and service factor.
Engineering review: send your application requirements
Inquiry Email
Please attach 2D/3D CAD drawings, target torque/speed, and quantity.