{"id":794,"date":"2026-06-23T09:47:18","date_gmt":"2026-06-23T09:47:18","guid":{"rendered":"https:\/\/oldhamcoupling.net\/product\/wh8-light-industrial-oldham-coupling\/"},"modified":"2026-06-24T08:47:46","modified_gmt":"2026-06-24T08:47:46","slug":"wh8-light-industrial-oldham-coupling","status":"publish","type":"product","link":"https:\/\/oldhamcoupling.net\/zh\/product\/wh8-light-industrial-oldham-coupling\/","title":{"rendered":"WH8 Light-Industrial Oldham Coupling"},"content":{"rendered":"
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WH8 Light-Industrial Cast-Iron Oldham Coupling \u2014 Heavy Reduction-Output and Mill-Feed Drives<\/h2>\n

The WH8 cast-iron Oldham coupling<\/strong> enters the heavy upper tier of the WH family. With 1 800 N\u00b7m rated torque, 50\u201370 mm bore range, 55 kg mass, and 2 400 rpm permissible speed, the WH8 is the coupling of choice for heavy gear-reducer output couplings, large agricultural machinery principal drives (large silage-harvester main drives, large bale-press primary outputs), heavy light-industrial mill-feed systems, and the higher-end small-plant crushing and screening auxiliary drives. At 55 kg, the WH8 requires hoist or two-person-plus-equipment handling, and the engineering specification at this mass class typically involves formal installation planning rather than field improvisation.<\/p>\n

The WH8 occupies an interesting comparative position in the Ever-power catalogue. At 1 800 N\u00b7m torque, it overlaps with the entry-level SL series (SL70: 125 N\u00b7m \u2014 significantly lower; SL90: 250 N\u00b7m \u2014 still much lower) only in bore size, not in torque. The WH8’s torque at 2 400 rpm actually places it in the domain of industrial equipment that would conventionally be considered mid-weight rather than light-industrial \u2014 demonstrating how the WH family’s high-speed envelope enables relatively small and economical cast-iron couplings to transmit substantial mechanical power. The coupling’s 30\u201340 % mass advantage over SL-series members at comparable bore ranges makes the WH8 the preferred specification wherever 2 400 rpm operation is feasible and the additional torque reserve of the SL family is unnecessary.<\/p>\n

Specifications<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Model<\/td>\nWH8<\/td>\n<\/tr>\n
Nominal Torque (Tn)<\/td>\n1 800 N\u00b7m<\/td>\n<\/tr>\n
Permissible Speed (n)<\/td>\n2 400 rpm<\/td>\n<\/tr>\n
Bore Range (d)<\/td>\n50 \u2013 70 mm<\/td>\n<\/tr>\n
Mass<\/td>\n55 kg<\/td>\n<\/tr>\n
Radial Misalignment (\u0394y)<\/td>\n1.0 mm<\/td>\n<\/tr>\n
Angular Misalignment (\u0394\u03b1)<\/td>\n0.5\u00b0<\/td>\n<\/tr>\n
Axial Misalignment (\u0394x)<\/td>\n1.0 mm<\/td>\n<\/tr>\n
Hub Material<\/td>\nHT250 grey cast iron<\/td>\n<\/tr>\n
Slider Material<\/td>\nInduction-hardened steel<\/td>\n<\/tr>\n
Lubrication<\/td>\nGrease (6-monthly)<\/td>\n<\/tr>\n
Shaft Engagement<\/td>\nKeyway + setscrew (M14)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\"WH8<\/p>\n

Materials<\/h3>\n
\n
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HT250 Cast-Iron Hubs (Standard WH8+)<\/h4>\n

HT250 grey cast iron with stress-relief annealing is the standard hub specification for WH8 and above. The higher tensile strength relative to HT200 (used in WH1\u2013WH6) provides adequate section-modulus for the 1 800 N\u00b7m torque rating across the 50\u201370 mm bore range, with a documented 2\u00d7 safety factor against peak-torque events. Each hub masses approximately 26 kg; hoist or two-person-with-support installation is required at this mass class.<\/p>\n<\/p><\/div>\n

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Heavy Induction-Hardened Slider<\/h4>\n

Induction-hardened carbon steel cross-slider. At 55 kg coupling mass the slider component is approximately 5\u20136 kg \u2014 a manageable individual field-replacement item. The hardened-steel-on-HT250-cast-iron interface provides predictable linear wear characteristic, enabling accurate inspection-based service-life planning at annual or semi-annual maintenance intervals.<\/p>\n<\/p><\/div>\n

\n

M14 Setscrew + Keyway (6-monthly grease)<\/h4>\n

H7-reamed bore with parallel keyway to GB\/T 1096, M14 set-screw for axial location. At the WH8’s torque and bore class, grease-repack interval shortens from annual (WH1\u2013WH7) to 6-monthly \u2014 the larger slider interface area requires more frequent lubrication replenishment to maintain optimum film thickness during the higher-power sliding-friction events. M14 Loctite 243 is recommended for shock-load applications.<\/p>\n<\/p><\/div>\n<\/div>\n

The WH Family at Heavy Duty<\/h3>\n

The WH8 and above demonstrate that the WH family’s cast-iron architecture can deliver meaningful heavy-duty performance at substantially lower mass and cost than competing SL-family or industrial gear-coupling specifications, provided the application operating speed is compatible with the WH family’s rpm envelope. At 2 400 rpm and 1 800 N\u00b7m, the WH8 transmits approximately 452 kW of instantaneous power \u2014 an impressive figure for a 55 kg cast-iron coupling. The SL family members capable of similar torque (SL280: 10 000 N\u00b7m, SL260: 9 000 N\u00b7m) operate at far lower speeds and are substantially heavier.<\/p>\n

For OEM equipment designers specifying gear-reducer output couplings, the WH8 fits a natural engineering niche: the gear-reducer output shaft is typically the highest-torque, lowest-speed shaft in the drive train, but at the WH8’s power class, the reducer output speed is still in the 1 000\u20132 000 rpm range \u2014 well within the WH8’s 2 400 rpm envelope. Specifying a WH8 at the reducer output rather than an SL family member saves 40\u201360 % of coupling mass and typically 30\u201340 % of acquisition cost, with no compromise in torque-transmission reliability. For system integrators and OEM designers, this mass-and-cost saving across a population of drive trains is a meaningful BOM optimisation. See the full Ever-power coupling guide<\/a> for cross-family selection comparisons.<\/p>\n

\"WH8<\/p>\n

Industry Applications<\/h3>\n
\n
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\u2699\ufe0f<\/span> Heavy Gear-Reducer Outputs<\/h4>\n

Output-shaft to driven-machine coupling on heavy-duty gear-reducer installations in general industry, food-processing, and chemical-plant equipment. WH8 mass advantage over SL-family alternatives is most pronounced here.<\/p>\n<\/p><\/div>\n

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<\/span> Large Agricultural Machinery<\/h4>\n

Main-drive coupling on large silage-harvesters, large round-bale-press primary outputs, and large feed-wagons. High-speed WH8 envelope compatible with agricultural PTO-coupled machinery speed ranges.<\/p>\n<\/p><\/div>\n

\n

<\/span> Heavy Mill-Feed Systems<\/h4>\n

Feed-screw and apron-feeder principal drives on light industrial milling operations. Near-zero-backlash supports consistent feed-rate control for product-quality management.<\/p>\n<\/p><\/div>\n

\n

\u26cf\ufe0f<\/span> Small Screening-Plant Main<\/h4>\n

Principal drives on small aggregate-screening plants and light minerals-processing operations. Shock-load tolerance absorbs material-impact events at screen-deck loading points.<\/p>\n<\/p><\/div>\n

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<\/span> Heavy Industrial Pumps<\/h4>\n

Main-drive coupling on large centrifugal and gear-pump installations in the 15\u201322 kW motor class for industrial, municipal, and process-plant applications.<\/p>\n<\/p><\/div>\n

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<\/span> Legacy Heavy Retrofit<\/h4>\n

Drop-in replacement for legacy gear-reducer, large-compressor, and heavy-industrial coupling specifications where the original has underperformed or become commercially unavailable.<\/p>\n<\/p><\/div>\n<\/div>\n

Why Choose Ever-power<\/h3>\n
\n

Quality & Compliance<\/h4>\n

WH8 production under ISO 9001:2015<\/strong>. Documentation covers RoHS<\/strong>, REACH<\/strong>, CE<\/strong>. HT250 material certification standard. The 6-monthly grease-repack schedule documentation supports maintenance-plan integration for heavy equipment operators.<\/p>\n

Mass-and-Cost Advantage<\/h4>\n

30\u201340 % mass and 30\u201340 % cost advantage versus SL-family alternatives at comparable bore ranges, provided the 2 400 rpm speed constraint is acceptable. Hub-only and slider-only supply options support retrofit economies.<\/p>\n

Aftermarket<\/h4>\n

WH8 sliders and hubs stocked for 2-business-day shipment. 55 kg requires freight shipping. Engineering responds within 24 hours<\/strong>. Distributor-programme pricing supported.<\/p>\n<\/div>\n

\"Ever-power<\/p>\n

Customer Reviews & Case Studies<\/h3>\n
\n
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\u2605\u2605\u2605\u2605\u2605<\/p>\n

DR Congo \u2014 Mining-Infrastructure Operator<\/h4>\n

Used in:<\/em> Heavy gear-reducer output coupling on a mineral-concentrator feed-screw installation.<\/p>\n

Feedback:<\/em> “Specified WH8 instead of SL-family alternative primarily on mass advantage \u2014 site hoist capacity constrained to 60 kg for this installation position. WH8’s 55 kg was the critical enabler. Four years of three-shift operation without coupling-related downtime. The 6-monthly grease schedule has integrated cleanly into our site maintenance calendar. Excellent cost-optimised specification for our constraints.”<\/p>\n<\/p><\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/p>\n

Angola \u2014 Cement-Plant Feeder<\/h4>\n

Used in:<\/em> Apron-feeder principal drive coupling on a regional cement-production plant.<\/p>\n

Feedback:<\/em> “Cement-dust ambient with continuous 24\/7 operation. WH8 in sealed coupling guard has performed without coupling-related incident for 5 years, with semi-annual grease repack at the only scheduled maintenance touchpoint. The combination of HT250 cast-iron hubs and hardened steel slider has proven durable in the cement-dust environment.”<\/p>\n<\/p><\/div>\n

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\u2605\u2605\u2605\u2605\u2606<\/p>\n

Mozambique \u2014 Agricultural Mechanisation Programme<\/h4>\n

Used in:<\/em> Main-drive coupling on large silage-harvester principal output shafts for a commercial sorghum-silage programme.<\/p>\n

Feedback:<\/em> “High-throughput seasonal duty with aggressive organic-material ambient. WH8 has handled 4 harvesting seasons without coupling failure. Knock one star only because replacement slider stock for remote rural deployment was logistically challenging \u2014 we had to pre-position spares ahead of each season. Would benefit from regional distributor stocking. Otherwise outstanding seasonal-duty specification.”<\/p>\n<\/p><\/div>\n<\/div>\n

Frequently Asked Questions<\/h3>\n
\nWhy does grease-repack interval shorten to 6-monthly at WH8?<\/summary>\n

At 55 kg coupling mass and 1 800 N\u00b7m torque, the slider interface area is substantially larger than smaller WH members. The grease film across this larger area degrades more quickly under the sustained sliding-friction work of heavy-duty operation. The 6-monthly repack interval maintains adequate film thickness across the full service window; extending beyond 6 months at WH8 and above risks progressive film-starvation leading to accelerated slider wear.<\/p>\n<\/details>\n

\nWhat is the WH8’s advantage over SL-family alternatives at this bore range?<\/summary>\n

At 50\u201370 mm bore, SL family members with comparable bore range (SL series from SL170 upward) have much higher torque ratings (typically 2 000+ N\u00b7m) but operate only at 250 rpm or below. For applications requiring 1 000\u20132 400 rpm, the WH8’s higher-speed envelope at 1 800 N\u00b7m is the more appropriate specification \u2014 55 kg vs. typically 90+ kg for comparable SL members, and substantially lower acquisition cost. For applications below 500 rpm requiring above 1 800 N\u00b7m, the SL family is the correct choice.<\/p>\n<\/details>\n

\nCan the WH8 be used in dusty industrial environments?<\/summary>\n

Yes, with appropriate dust exclusion through a sealed coupling guard. For cement-dust, grain-dust, and mineral-dust environments, specify an IP55-rated coupling guard and shorten grease-repack to quarterly (every 3 months) to flush any ingested particulate from the slider interface. The HT250 cast-iron hub surface develops a natural protective oxide layer that resists mild chemical and abrasive ambient well.<\/p>\n<\/details>\n

\nWhat M14 setscrew torque is recommended?<\/summary>\n

The standard M14 setscrew should be torqued to 55 N\u00b7m for class 10.9 hardware (standard supply). For shock-load applications (crushers, compactors, heavy agricultural equipment with foreign-object inclusion risk), apply Loctite 243 medium-strength thread-lock to the setscrew before final tightening to prevent vibration-induced backing-out. Re-check setscrew torque after the first 50 operating hours following initial installation or slider replacement.<\/p>\n<\/details>\n

\nWhat aftermarket logistics support is available for remote site operators?<\/summary>\n

For remote-site operators (mining sites, large agricultural operations, offshore platforms), Ever-power recommends pre-positioning seasonal buffer stock \u2014 typically 2 slider plates and 1 complete coupling per installed WH8 \u2014 at a local logistics hub ahead of planned intensive-use seasons. Ever-power supports pre-season purchase orders with firm delivery commitments, supporting operators to build their site safety-stock ahead of peak-demand periods. Sales desk coordinates appropriate logistics routes for remote delivery on request.<\/p>\n<\/details>\n

Quote WH8 for Heavy Gear-Reducer and Mill-Feed Applications<\/h3>\n

For heavy gear-reducer output, large agricultural machinery, heavy mill-feed, small screening-plant, and heavy industrial-pump applications in the 1 800 N\u00b7m mid-speed class, the WH8 offers a compelling mass-and-cost advantage over heavier SL-family alternatives. Browse the wider WH series catalogue<\/a>, read about Ever-power’s industrial coupling supply<\/a>, or enquire below.<\/p>\n

\n Quote WH8 \u2192<\/a>\n<\/p>\n