Description
WH10 Apex Cast-Iron Oldham Coupling — The WH Family’s Highest Torque, Maximum Bore Drive Joint
The WH10 cast-iron Oldham coupling is the apex of the WH family — the highest-torque, largest-bore, and heaviest specification in the entire WH light-industrial catalogue. With 5 000 N·m rated torque, 80–100 mm bore range, 120 kg mass, and 1 500 rpm permissible speed, the WH10 represents the upper practical boundary of cast-iron cross-slider Oldham coupling design in the light-industrial segment. It is sized for the heaviest light-industrial plant drives — large conveyor main-drive outputs, heavy-process fan and blower drives operating at the high-torque lower end of their speed range, large industrial gear-reducer outputs in the 30–55 kW motor class, and the upper-end heavy construction-equipment principal drives where the WH family’s speed-versus-cost advantage still applies.
The WH10 occupies a distinctive position as the point where the WH and SL families begin to overlap more directly in torque class. At 5 000 N·m, the WH10 exceeds the SL70 (125 N·m), SL90 (250 N·m), SL100 (355 N·m), SL130 (500 N·m), SL150 (800 N·m), and SL170 (2 000 N·m) SL family members in torque — and does so at 1 500 rpm versus the SL family’s 250 rpm maximum. The WH10 is not competing with these SL members for the same applications; rather, it is the optimum specification for heavy plant drives that happen to operate at mid-range speeds (600–1 500 rpm) where the SL family is dramatically over-massive and the WH10’s architecture provides the appropriate balance of torque, speed, and cost. For plant engineers specifying at the boundary of this speed-torque landscape, understanding when to choose WH10 versus the entry-level SL series is the key selection decision — and the answer is almost always WH10 when the operating speed exceeds 500 rpm.
Specifications
| Parameter | Value |
|---|---|
| Model | WH10 |
| Nominal Torque (Tn) | 5 000 N·m |
| Permissible Speed (n) | 1 500 rpm |
| Bore Range (d) | 80 – 100 mm |
| Mass | 120 kg |
| Radial Misalignment (Δy) | 1.5 mm |
| Angular Misalignment (Δα) | 0.5° |
| Axial Misalignment (Δx) | 1.5 mm |
| Hub Material | HT250 grey cast iron |
| Slider Material | Induction-hardened steel |
| Lubrication | Grease (6-monthly) |
| Shaft Engagement | Keyway + setscrew (M16) |
Materials
HT250 Cast-Iron Hubs — Apex Specification
HT250 grey cast iron with stress-relief annealing. At WH10’s 120 kg total mass, each hub is approximately 55 kg — crane or hoist installation is mandatory, and the installation plan must account for hub handling at height or in constrained access-equipment environments. Hub section is engineered for a 2× safety factor against 5 000 N·m peak, with section geometry optimised for the 80–100 mm bore range that defines the WH10’s position as the catalogue’s upper boundary.
Heavy Apex Slider
Induction-hardened steel cross-slider at approximately 10–12 kg mass for the WH10 — the heaviest slider in the WH family. Pre-machined lifting-strap anchor points provided. The slider remains the sole field-replaceable wear component, with service life typically 5–7 years under standard heavy light-industrial duty. At the WH10’s size class, slider replacement planning should be integrated into the host-equipment’s major-maintenance-overhaul scheduling.
M16 Setscrew with Mandatory Loctite
H7-reamed bore with parallel keyway to GB/T 1096, M16 setscrew to 80 N·m. At the WH10’s size and torque class, Loctite 243 thread-lock is mandatory as standard — not a conditional recommendation. The combination of 120 kg rotating mass and 5 000 N·m torque produces substantial vibration-induced setscrew back-off risk during start-up transients; Loctite 243 is the engineering control that eliminates this failure mode.
Understanding the WH-SL Family Boundary
The WH10 represents the terminus of one architectural lineage and the beginning of another. Above 5 000 N·m in the Ever-power Oldham coupling catalogue, the appropriate specification is the SL series — the family designed specifically for slow-speed, high-torque, heavy-industrial duty with QT500 ductile-iron hubs, taper-bushed mounting, and the full suite of engineering documentation appropriate for critical-asset industrial applications. At or below 5 000 N·m with operating speeds above 500 rpm, the WH10 is typically the more appropriate and cost-economical specification.
The practical significance of this boundary is that plant engineers encountering the WH10 and SL series side-by-side in a catalogue should always ask the primary question: what is the actual operating speed of my application? If the answer is above 500 rpm, the WH10’s higher-speed envelope makes it the more efficient specification — at 1 000 rpm, the WH10 transmits approximately 524 kW, versus the SL170’s 52 kW at its 250 rpm maximum. If the answer is below 300 rpm, the SL series becomes the appropriate specification — its heavy-industrial architecture is optimised for very low speed and very high torque. The 300–500 rpm range is where the selection requires careful engineering review of both families, and Ever-power engineering is available to assist with cross-family comparison at this boundary. See the full catalogue comparison for supporting data.
Industry Applications
Large Conveyor Main Drives
Main-drive coupling on large industrial conveyor-head pulley outputs in mining, aggregate, and bulk-material handling. Near-zero-backlash and misalignment tolerance support long-conveyor reliability.
Heavy Process Fan Drives
Main-drive coupling on large industrial fans, heavy baghouse-filter fans, and major HVAC-plant main fan drives operating at the high-torque lower end of their speed range.
⚙️ Large Gear-Reducer Outputs
Output-shaft to driven-machine coupling on large gear-reducer installations in the 30–55 kW class. WH10 mass and cost advantage over SL-family alternatives when operating speed is 500–1 500 rpm.
️ Heavy Construction Main Drives
Principal drives on the heaviest construction-equipment — large concrete-batch-plant main mixers, heavy aggregate-screening-plant main conveyor drives, and large vibratory-compactor principal shafts.
Very Large Industrial Pumps
Main-drive coupling on the largest centrifugal and gear-pump installations in the 30–55 kW class for industrial, mining-water, and large-municipality water-supply infrastructure.
Heaviest Agricultural Principal
Principal-shaft drives on the heaviest commercial agricultural equipment — large sugar-cane crushers, large grain-driers main drives, and heavy feed-mill hammer-mill main drives operating at mid-range speeds.
Why Choose Ever-power
Quality & Compliance
WH10 production under ISO 9001:2015. Documentation covers RoHS, REACH, CE conformity. HT250 material certification standard. At the WH10’s size class, supplementary engineering consultation is available to compare WH10 and lower SL-family specifications for applications near the speed-torque boundary. Ever-power’s engineering team responds within 24 hours for WH10 specification enquiries.
The Apex Value Proposition
At 5 000 N·m the WH10 provides the highest torque available in the WH family, the widest bore range (80–100 mm), and the largest misalignment envelope (1.5 mm parallel). For applications within the 1 500 rpm speed limit, it delivers these capabilities at 30–40 % lower cost than SL-family equivalents and 40–50 % lower cost than gear-coupling equivalents at this torque level.
Aftermarket
WH10 sliders and hubs available on 10-business-day lead time from enquiry — the longer lead time reflects the substantial machining-time for 100 mm bore hubs at 55 kg each. Emergency-procurement arrangements available for critical plant applications. Sea-freight in custom wooden crate for export. Engineering responds within 24 hours.
Customer Reviews & Case Studies
★★★★★
Central African Republic — Mining Operator
Used in: Large conveyor main-drive output coupling on a primary diamond-sorting conveyor system.
Feedback: “Remote site with very constrained maintenance access — coupling reliability for 5+ year intervals was a non-negotiable requirement. WH10 with 6-monthly grease schedule has now passed 5 years without any coupling-related incident. The clear documentation of the WH-SL boundary was helpful in our specification review — confirmed WH10 was the correct selection for our 1 200 rpm operating speed rather than the heavier SL alternative that was initially proposed.”
★★★★★
Republic of Congo — Sugar-Processing Mill
Used in: Main-drive output coupling on a large sugar-cane processing mill primary crusher.
Feedback: “Seasonal crushing-duty with significant foreign-object inclusion risk. WH10 with mandatory Loctite M16 setscrew and 6-monthly grease has delivered 5 crushing seasons without coupling failure. The 120 kg mass required dedicated hoist installation support, which we now pre-budget as a standard item in major-equipment commissioning plans. Excellent highest-torque WH specification for our application.”
★★★★☆
Gabon — Heavy Industrial Fan Operator
Used in: Main-drive coupling on large process-ventilation fan drives in a wood-products processing facility.
Feedback: “Fan operating speed 900 rpm — well within WH10 envelope. The 5 000 N·m rating provides comfortable margin for our 3 400 N·m continuous demand. Four years of three-shift production without coupling-related downtime. Knock one star only because the 10-business-day lead time for replacement slider stock meant our maintenance team had to plan replacement procurement well in advance — more prominent documentation of this lead-time characteristic would have been helpful during initial specification review.”
Frequently Asked Questions
What is the WH10’s position at the WH-SL family boundary?
The WH10 at 5 000 N·m is the highest-torque WH family member. Applications requiring above 5 000 N·m should move to the SL series. Applications below 5 000 N·m at above 500 rpm should strongly consider WH10. In the 300–500 rpm zone requiring 3 000–5 000 N·m, either family may be appropriate — Ever-power engineering provides cross-family comparison support for applications in this boundary zone.
Why is Loctite 243 mandatory (not just recommended) for WH10?
At WH10’s 120 kg rotating mass and 5 000 N·m torque, the amplitude of vibration-induced force on the M16 setscrew during start-up transients is substantial. Without thread-lock, setscrew backing-out under vibration has been documented in field-service history at the WH10 size class. Loctite 243 provides a residual clamping force that maintains positive shaft retention between maintenance cycles. The engineering team classified this as a mandatory specification rather than a recommendation after reviewing field-service data across WH10 installations.
What crane or hoist capacity is required for WH10 installation?
Minimum 500 kg crane capacity for full-assembly handling. For hub-by-hub installation sequence, each hub at 55 kg requires minimum 150 kg hoist with safety factor. Ever-power installation documentation for WH10 covers a recommended two-phase installation sequence: hub-by-hub shaft mounting followed by slider insertion and hub alignment, minimising the maximum lifted mass at any individual operation. Custom installation fixture drawings are available for horizontal shaft configurations on request.
What is the slider replacement lead time and how should it be managed?
WH10 slider plate lead time is 10 business days from order confirmation. At 5–7 year typical slider service life, this means engineers should initiate replacement-slider procurement approximately 3–4 months ahead of planned major-overhaul events. For critical plant applications, Ever-power recommends holding one replacement slider in site safety-stock. Contact the sales desk for pre-arranged annual slider-supply agreements that eliminate ad-hoc procurement risk.
Can the WH10 be used for fan drives operating below 1 500 rpm?
Yes — the 1 500 rpm permissible speed is a maximum, not a required operating speed. Fan drives operating at any speed from start-up through to 1 500 rpm are fully within the WH10’s catalogue specification. For fan drives where variable-speed operation extends below the rated torque at reduced speed (typical of VFD-controlled fans), the WH10’s 5 000 N·m rating provides comfortable margin across the full VFD speed range, including the high-torque low-speed start-up transient.
Quote WH10 — The Apex of the WH Family
For large conveyor main, heavy process fan, large gear-reducer output, heavy construction main, very large industrial pump, and heaviest agricultural applications at the top of the WH family’s performance envelope, the WH10 is the highest-torque cast-iron cross-slider Oldham coupling in the Ever-power catalogue. Browse the complete WH and SL series catalogue, learn about Ever-power’s heavy-coupling portfolio, or contact us to discuss your specific application below.