{"id":1844,"date":"2026-05-26T08:56:47","date_gmt":"2026-05-26T08:56:47","guid":{"rendered":"https:\/\/chinawormgearbox.xyz\/product\/wpkz-hollow-shaft-vertical-output-single-speed-worm-gear-reducer\/"},"modified":"2026-05-26T08:56:47","modified_gmt":"2026-05-26T08:56:47","slug":"wpkz-hollow-shaft-vertical-output-single-speed-worm-gear-reducer","status":"publish","type":"product","link":"https:\/\/chinawormgearbox.xyz\/it\/product\/wpkz-hollow-shaft-vertical-output-single-speed-worm-gear-reducer\/","title":{"rendered":"WPKZ Hollow Shaft Vertical Output Single Speed Worm Gear Reducer"},"content":{"rendered":"
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WPKZ Hollow Shaft Vertical Output Single Speed Worm Gear Reducer \u2014 Coupling-Free Direct-Mount for Auger, Spiral, & Vertical Screw Drives<\/h1>\n

The most challenging drive integration scenario in screw conveyor and auger machine design combines two requirements simultaneously: an upward-pointing output shaft (to drive the screw directly without right-angle gearing) and a hollow bore output (to mount the gearbox directly onto the screw shaft without a separate coupling). The WPKZ hollow shaft vertical output worm gear reducer<\/strong> is the purpose-engineered solution that satisfies both requirements in a single compact cast iron unit.<\/p>\n

By combining the vertical output geometry of the WPZ with the H7 precision hollow bore of the WPKZ, this gearbox delivers a vertical, coupling-free direct shaft mount that eliminates both angle drive accessories and output couplings from the drive arrangement \u2014 the most compact and lowest-part-count vertical screw drive solution available. Available in 7 frame sizes<\/strong> (50\u2013135 mm) with ratios 1\/5 to 1\/60. About Ever-power<\/a> | Get a Quote<\/a><\/p>\n<\/section>\n

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Technical Specifications<\/h2>\n

WPKZ dimensional data. S = hollow bore diameter (output bore); W\u00d7Y = bore keyway dimensions. E\u2081, E\u2082 = output shaft extension above\/below housing. Input shaft is horizontal. All dimensions in mm; reference input speed 1500 r\/min<\/strong>.<\/p>\n

\"WPKZ<\/div>\n
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Size<\/th>\nRatio<\/th>\nAB<\/th>\nLL<\/th>\nB<\/th>\nBB<\/th>\nCC<\/th>\nE\u2081<\/th>\nE\u2082<\/th>\nF<\/th>\nG<\/th>\nM<\/th>\nN<\/th>\nZ<\/th>\nHS<\/th>\nU<\/th>\nT\u00d7V<\/th>\nS(bore)<\/th>\nW\u00d7Y(keyway)<\/th>\nWt(kg)<\/th>\nOil(L)<\/th>\n<\/tr>\n<\/thead>\n
50<\/td>\n1\/5\u20131\/60<\/td>\n108<\/td>\n77<\/td>\n150<\/td>\n97<\/td>\n50<\/td>\n53<\/td>\n77<\/td>\n100<\/td>\n15<\/td>\n125<\/td>\n160<\/td>\n11<\/td>\n30<\/td>\n12<\/td>\n4\u00d72.5<\/td>\n20<\/td>\n6\u00d722.8<\/td>\n8<\/td>\n0.4<\/td>\n<\/tr>\n
60<\/td>\n1\/10\u20131\/60<\/td>\n120<\/td>\n82<\/td>\n168<\/td>\n112<\/td>\n60<\/td>\n68<\/td>\n92<\/td>\n100<\/td>\n15<\/td>\n130<\/td>\n190<\/td>\n11<\/td>\n40<\/td>\n15<\/td>\n5\u00d73<\/td>\n25<\/td>\n8\u00d728.3<\/td>\n10.5<\/td>\n0.5<\/td>\n<\/tr>\n
70<\/td>\n<\/td>\n140<\/td>\n95<\/td>\n194<\/td>\n131<\/td>\n70<\/td>\n75<\/td>\n115<\/td>\n120<\/td>\n20<\/td>\n155<\/td>\n230<\/td>\n15<\/td>\n40<\/td>\n18<\/td>\n5\u00d73<\/td>\n30<\/td>\n8\u00d733.3<\/td>\n15<\/td>\n0.6<\/td>\n<\/tr>\n
80<\/td>\n<\/td>\n160<\/td>\n100<\/td>\n214<\/td>\n142<\/td>\n80<\/td>\n96<\/td>\n144<\/td>\n125<\/td>\n20<\/td>\n160<\/td>\n265<\/td>\n15<\/td>\n50<\/td>\n22<\/td>\n7\u00d74<\/td>\n35<\/td>\n10\u00d738.3<\/td>\n20<\/td>\n1.1<\/td>\n<\/tr>\n
100<\/td>\n<\/td>\n190<\/td>\n135<\/td>\n254<\/td>\n169<\/td>\n100<\/td>\n100<\/td>\n150<\/td>\n155<\/td>\n22<\/td>\n196<\/td>\n310<\/td>\n15<\/td>\n50<\/td>\n25<\/td>\n7\u00d74<\/td>\n40<\/td>\n12\u00d743.3<\/td>\n35<\/td>\n1.5<\/td>\n<\/tr>\n
120<\/td>\n<\/td>\n219<\/td>\n160<\/td>\n282<\/td>\n190<\/td>\n120<\/td>\n120<\/td>\n180<\/td>\n180<\/td>\n28<\/td>\n230<\/td>\n360<\/td>\n18<\/td>\n65<\/td>\n30<\/td>\n7\u00d74<\/td>\n45<\/td>\n14\u00d748.8<\/td>\n60<\/td>\n4<\/td>\n<\/tr>\n
135<\/td>\n<\/td>\n249<\/td>\n170<\/td>\n317<\/td>\n210<\/td>\n135<\/td>\n130<\/td>\n200<\/td>\n200<\/td>\n30<\/td>\n250<\/td>\n410<\/td>\n18<\/td>\n75<\/td>\n35<\/td>\n10\u00d74.5<\/td>\n60<\/td>\n18\u00d764.4<\/td>\n80<\/td>\n5.2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

* WPKZ available in sizes 50\u2013135. S = hollow bore diameter matching driven screw shaft. Bore tolerance H7; driven shaft should be h6 or js6. Three input shaft direction positions (A, B, C).<\/p>\n<\/section>\n

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Product Structure \u2014 Hollow Bore + Vertical Output<\/h2>\n
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\"WPKZ<\/div>\n
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The WPKZ combines the vertical-output housing geometry of the WPZ with a through-bored worm wheel shaft. The hollow bore exits through the top of the housing, allowing the driven screw or auger shaft to pass up through the gearbox and be directly driven without any coupling element. The flat base bolts directly to the conveyor trough or auger frame for the most compact possible vertical screw drive assembly.<\/p>\n\n\n\n\n\n\n\n
Output<\/td>\nVertical hollow bore H7 through worm wheel shaft \u2014 screw shaft slides directly in<\/td>\n<\/tr>\n
Bore Size<\/td>\n20 mm (size 50) to 60 mm (size 135) \u2014 matches standard screw conveyor shaft sizes<\/td>\n<\/tr>\n
Housing<\/td>\nFC25 cast iron upright block with flat base \u2014 bolts directly to conveyor frame<\/td>\n<\/tr>\n
Input Shaft<\/td>\nHorizontal solid shaft with keyway; 3 direction positions (A, B, C)<\/td>\n<\/tr>\n
Lubrication<\/td>\nDesigned for vertical-output orientation; top-face oil fill and breather<\/td>\n<\/tr>\n
Self-Locking<\/td>\nAvailable at ratios \u22651\/30 \u2014 prevents back-feeding and gravity-driven reversal<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<\/div>\n<\/section>\n
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\u2705 Key Features & Benefits<\/h2>\n
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\u2b06\ufe0f<\/div>\n

Vertical Hollow Bore \u2014 No Angle Drive, No Coupling<\/h3>\n

The WPKZ combines two output features in one unit: vertical output direction AND hollow bore shaft mounting. The result is a drive arrangement that requires no right-angle bevel drive, no separate coupling, and no adapter hub \u2014 reducing the screw conveyor or auger drive assembly to its theoretical minimum part count. Keywords: hollow shaft vertical worm gearbox, auger drive worm reducer.<\/em><\/p>\n<\/div>\n

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Direct Screw Shaft Integration<\/h3>\n

The precision H7 hollow bore accepts the screw or auger shaft directly. The shaft passes through the bore from below, is located radially by the bore and rotationally by the keyway, and is retained axially by a set screw or shrink disc. The entire drive assembly \u2014 gearbox body, screw shaft, and screw blade \u2014 becomes a single rigid, compact unit.<\/p>\n<\/div>\n

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Self-Locking for Gravity Back-Feed Prevention<\/h3>\n

At ratios of 1\/30 and above, the WPKZ worm gearing self-locks under static conditions, preventing the screw from back-feeding under gravity load when the motor stops. For bulk powder and grain handling applications, this prevents material spillage and simplifies the control system by removing the need for a separate load-holding brake on light-duty applications.<\/p>\n<\/div>\n

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\ufe0f<\/div>\n

Flat-Base Direct-Mount to Conveyor Frame<\/h3>\n

The WPKZ flat base bolts directly to the conveyor trough end plate or auger drive flange without adapter brackets or spacers. This produces the most compact possible drive head assembly \u2014 important for mobile agricultural machinery and tight-clearance industrial installations where every millimetre of vertical height matters.<\/p>\n<\/div>\n

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Same Geometry as WPZ \u2014 Same Footprint<\/h3>\n

The WPKZ shares the identical housing dimensions with the WPZ solid-shaft version. If an existing WPZ installation needs to be upgraded to a hollow bore output (for example, because the shaft coupling is being eliminated), the WPKZ is a direct dimensional replacement with no frame or motor changes required.<\/p>\n<\/div>\n

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7 Frame Sizes \u2014 Full Screw Drive Coverage<\/h3>\n

Bore diameters from 20 mm (size 50) to 60 mm (size 135) cover the standard shaft diameters of small-to-medium screw conveyors and auger machines. Nine ratios (1\/5\u20131\/60) provide output speed flexibility from light rapid feeding to heavy slow-turn applications.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Industry Applications<\/h2>\n

The WPKZ is specified for screw conveyor, auger, and agitator applications requiring the absolute minimum-part-count vertical hollow-bore drive:<\/p>\n

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Vertical Screw Conveyors<\/strong>Vertical screw conveyors for grain, flour, powders, and plastic pellets where the WPKZ mounts directly at the base of the vertical screw tube, connecting to the screw shaft without angle drives.<\/span><\/div>\n

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Spiral Feeders & Dosing Screws<\/strong>Pharmaceutical, food, and chemical dosing screws requiring precise, low-speed hollow-shaft drive with compact footprint in clean-room or process vessel head designs.<\/span><\/div>\n

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\ufe0f<\/div>\n

Concrete & Dry Mortar Plants<\/strong>Vertical cement screw conveyor drives and dry mortar mixing plant feed screw drives where the WPKZ compact hollow-bore vertical drive simplifies the conveyor drive head assembly.<\/span><\/div>\n

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Agricultural Auger Drives<\/strong>Mobile grain auger and seed treatment machine drives where compact, direct-shaft hollow bore vertical gearboxes reduce machine width and simplify seasonal field maintenance.<\/span><\/div>\n

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\u2697\ufe0f<\/div>\n

Chemical Agitator Drive Heads<\/strong>Compact reactor vessel top-entry agitator drives where the hollow shaft accepts the agitator shaft directly and the flat gearbox base mounts to the vessel nozzle flange.<\/span><\/div>\n

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Aquaculture Feed Screws<\/strong>Vertical feed auger drives in fish farm feeding systems and shrimp hatchery pellet feeders requiring minimal footprint hollow-shaft direct drive in outdoor wet environments.<\/span><\/div>\n<\/div>\n<\/section>\n

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Quality Control & Certification<\/h2>\n
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ISO 9001:2015 & CE<\/h3>\n

Full ISO 9001:2015 QMS with CE Declaration of Conformity per shipment. Hollow bore verified to H7 tolerance by calibrated plug gauge; units run-tested in vertical-output orientation as standard, not translated from horizontal test data.<\/p>\n<\/div>\n

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Bore + Vertical Run Test<\/h3>\n

Each WPKZ undergoes: (1) hollow bore plug gauge measurement to H7, (2) bore-to-output-centreline concentricity check (\u22640.05 mm TIR), and (3) 30-minute run test in vertical-output orientation. All three must pass before shipment approval.<\/p>\n<\/div>\n

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Material Standards<\/h3>\n

Housing: FC25 cast iron (\u2265250 MPa). Worm: 20CrMnTi (\u226558 HRC). Wheel: ZCuSn10Pb1 tin-bronze. Third-party SGS or BV inspection available on request for food, grain, and aquaculture industry compliance requirements.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Why Choose Ever-power for WPKZ Gearboxes<\/h2>\n
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\"Ever-power<\/div>\n
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We supply WPKZ hollow shaft vertical output gearboxes to agricultural machinery OEMs, conveyor equipment builders, and pharmaceutical agitator manufacturers in the Netherlands, Brazil, India, Australia, and over 60 countries worldwide. Our combined hollow bore grinding and vertical orientation test capabilities make us one of the few manufacturers in the world that validates the WPKZ in its actual operating orientation before shipment.<\/p>\n