{"id":1841,"date":"2026-05-26T08:56:44","date_gmt":"2026-05-26T08:56:44","guid":{"rendered":"https:\/\/chinawormgearbox.xyz\/product\/wpka-hollow-shaft-single-speed-worm-gear-reducer\/"},"modified":"2026-05-26T08:56:44","modified_gmt":"2026-05-26T08:56:44","slug":"wpka-hollow-shaft-single-speed-worm-gear-reducer","status":"publish","type":"product","link":"https:\/\/chinawormgearbox.xyz\/nn\/product\/wpka-hollow-shaft-single-speed-worm-gear-reducer\/","title":{"rendered":"WPKA Hollow Shaft Single Speed Worm Gear Reducer"},"content":{"rendered":"
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WPKA Hollow Shaft Single Speed Worm Gear Reducer \u2014 Direct Shaft-Mount Drive for Mixers, Agitators & Feeders<\/h1>\n

Conventional shaft couplings introduce misalignment tolerance, require precise mounting, and add a maintenance touchpoint to every driven machine. The WPKA hollow shaft worm gear reducer<\/strong> resolves this problem by replacing the solid output shaft with a precision-bored hollow shaft that slides directly over the driven machine shaft \u2014 creating a compact, rigid, alignment-free connection that eliminates the coupling entirely from the drive chain.<\/p>\n

Available in 12 frame sizes<\/strong> (40\u2013250 mm) with ratios from 1\/5 to 1\/60, the WPKA is the hollow shaft worm gearbox<\/em> of choice for agitator shafts, feeder screws, conveyor rollers, and any application where a direct-fit, coupling-free output connection reduces machine complexity and installation time. The foot-mounted cast iron housing ensures the same heavy-duty durability as the solid-shaft WPA series. About Ever-power<\/a> | Request a Quote<\/a><\/p>\n<\/section>\n

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Technical Specifications<\/h2>\n

Full dimensional data for all WPKA sizes. S = hollow bore diameter; W\u00d7Y = keyway width \u00d7 depth in bore. Input shaft: HS = shaft diameter; U = shaft length; T\u00d7V = keyway. Reference input speed 1500 r\/min<\/strong>. All dimensions in mm.<\/p>\n

\"WPKA<\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Size<\/th>\nRatio<\/th>\nA<\/th>\nAB<\/th>\nB<\/th>\nCC<\/th>\nH<\/th>\nHL<\/th>\nM<\/th>\nN<\/th>\nE<\/th>\nF<\/th>\nG<\/th>\nZ<\/th>\nHS<\/th>\nU<\/th>\nT\u00d7V<\/th>\nS(bore)<\/th>\nW\u00d7Y(keyway)<\/th>\nWt(kg)<\/th>\n<\/tr>\n<\/thead>\n
40<\/td>\n1\/5\u20131\/60<\/td>\n143<\/td>\n87<\/td>\n85<\/td>\n40<\/td>\n138<\/td>\n40<\/td>\n90<\/td>\n100<\/td>\n70<\/td>\n80<\/td>\n13<\/td>\n10<\/td>\n25<\/td>\n12<\/td>\n4\u00d72.5<\/td>\n16<\/td>\n6\u00d718.8<\/td>\n5<\/td>\n<\/tr>\n
50<\/td>\n<\/td>\n175<\/td>\n108<\/td>\n105<\/td>\n50<\/td>\n176<\/td>\n50<\/td>\n120<\/td>\n140<\/td>\n95<\/td>\n110<\/td>\n15<\/td>\n12<\/td>\n30<\/td>\n12<\/td>\n4\u00d72.5<\/td>\n20<\/td>\n6\u00d722.8<\/td>\n7.5<\/td>\n<\/tr>\n
60<\/td>\n<\/td>\n198<\/td>\n120<\/td>\n110<\/td>\n60<\/td>\n204<\/td>\n60<\/td>\n130<\/td>\n150<\/td>\n105<\/td>\n120<\/td>\n20<\/td>\n11<\/td>\n40<\/td>\n15<\/td>\n5\u00d73<\/td>\n25<\/td>\n8\u00d728.3<\/td>\n11<\/td>\n<\/tr>\n
70<\/td>\n<\/td>\n231<\/td>\n140<\/td>\n130<\/td>\n70<\/td>\n236<\/td>\n70<\/td>\n150<\/td>\n190<\/td>\n115<\/td>\n150<\/td>\n20<\/td>\n15<\/td>\n40<\/td>\n18<\/td>\n5\u00d73<\/td>\n30<\/td>\n8\u00d733.3<\/td>\n15.5<\/td>\n<\/tr>\n
80<\/td>\n<\/td>\n261<\/td>\n160<\/td>\n150<\/td>\n80<\/td>\n268<\/td>\n80<\/td>\n170<\/td>\n220<\/td>\n135<\/td>\n180<\/td>\n20<\/td>\n15<\/td>\n50<\/td>\n22<\/td>\n7\u00d74<\/td>\n35<\/td>\n10\u00d738.3<\/td>\n22<\/td>\n<\/tr>\n
100<\/td>\n<\/td>\n322<\/td>\n190<\/td>\n160<\/td>\n100<\/td>\n336<\/td>\n100<\/td>\n193<\/td>\n270<\/td>\n155<\/td>\n220<\/td>\n25<\/td>\n15<\/td>\n50<\/td>\n25<\/td>\n7\u00d74<\/td>\n40<\/td>\n12\u00d743.3<\/td>\n36<\/td>\n<\/tr>\n
120<\/td>\n<\/td>\n371<\/td>\n219<\/td>\n175<\/td>\n120<\/td>\n430<\/td>\n120<\/td>\n233<\/td>\n320<\/td>\n180<\/td>\n260<\/td>\n30<\/td>\n18<\/td>\n65<\/td>\n30<\/td>\n7\u00d74<\/td>\n45<\/td>\n14\u00d748.8<\/td>\n62<\/td>\n<\/tr>\n
135<\/td>\n<\/td>\n422<\/td>\n249<\/td>\n210<\/td>\n135<\/td>\n480<\/td>\n135<\/td>\n253<\/td>\n350<\/td>\n200<\/td>\n290<\/td>\n30<\/td>\n18<\/td>\n75<\/td>\n35<\/td>\n10\u00d74.5<\/td>\n60<\/td>\n18\u00d764.4<\/td>\n80<\/td>\n<\/tr>\n
155<\/td>\n<\/td>\n497<\/td>\n295<\/td>\n256<\/td>\n155<\/td>\n531<\/td>\n135<\/td>\n275<\/td>\n390<\/td>\n220<\/td>\n320<\/td>\n35<\/td>\n21<\/td>\n85<\/td>\n40<\/td>\n12\u00d75<\/td>\n70<\/td>\n20\u00d774.9<\/td>\n114<\/td>\n<\/tr>\n
175<\/td>\n<\/td>\n534<\/td>\n314<\/td>\n282<\/td>\n175<\/td>\n600<\/td>\n160<\/td>\n310<\/td>\n430<\/td>\n250<\/td>\n350<\/td>\n40<\/td>\n20<\/td>\n85<\/td>\n45<\/td>\n14\u00d75.5<\/td>\n80<\/td>\n22\u00d785.4<\/td>\n150<\/td>\n<\/tr>\n
200<\/td>\n<\/td>\n580<\/td>\n342<\/td>\n320<\/td>\n200<\/td>\n666<\/td>\n175<\/td>\n360<\/td>\n480<\/td>\n290<\/td>\n390<\/td>\n40<\/td>\n22<\/td>\n95<\/td>\n50<\/td>\n14\u00d75.5<\/td>\n85<\/td>\n22\u00d790.4<\/td>\n215<\/td>\n<\/tr>\n
250<\/td>\n<\/td>\n705<\/td>\n420<\/td>\n400<\/td>\n250<\/td>\n800<\/td>\n200<\/td>\n460<\/td>\n560<\/td>\n380<\/td>\n480<\/td>\n45<\/td>\n28<\/td>\n110<\/td>\n60<\/td>\n18\u00d77<\/td>\n110<\/td>\n28\u00d790<\/td>\n360<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

* S = hollow output bore diameter (mm). W\u00d7Y = keyway dimensions in output bore. The driven shaft diameter must match S within h6\/H7 tolerance for correct interference fit.<\/p>\n<\/section>\n

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Product Structure \u2014 Hollow Output Shaft Design<\/h2>\n
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\"WPKA<\/div>\n
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The WPKA replaces the solid output shaft of the WPA with a through-bored worm wheel shaft. The bore is precision-ground to an H7 tolerance and fitted with an internal keyway, allowing the driven shaft to be located both radially (by the bore) and rotationally (by the key) in a single assembly step. A set screw or shrink-disc can provide additional axial retention.<\/p>\n\n\n\n\n\n\n\n
Output Type<\/td>\nPrecision hollow bore H7 with internal keyway \u2014 no coupling required<\/td>\n<\/tr>\n
Bore Tolerance<\/td>\nH7 \u2014 mates with shaft ground to h6 or js6 for precise alignment<\/td>\n<\/tr>\n
Housing<\/td>\nFC25 grey cast iron, same footprint as WPA series<\/td>\n<\/tr>\n
Input Shaft<\/td>\nStandard solid shaft with keyway \u2014 5 direction positions (A\u2013E)<\/td>\n<\/tr>\n
Worm Pair<\/td>\n20CrMnTi worm (\u226558 HRC) + ZCuSn10Pb1 bronze wheel<\/td>\n<\/tr>\n
Axial Retention<\/td>\nSet screw standard; shrink disc optional for higher torque or reversing loads<\/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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01<\/span><\/p>\n

Coupling-Free Direct Shaft Mount<\/h3>\n

The H7 precision hollow bore mates directly to the driven shaft \u2014 no coupling, no hub, no adapter plate. The shaft simply slides into the bore, the key transmits torque, and the assembly is complete. This eliminates the coupling misalignment that accounts for a disproportionate share of bearing and seal failures in indirect-drive gearboxes. Keywords: hollow shaft worm gearbox, direct shaft mount worm reducer.<\/em><\/p>\n<\/div>\n

02<\/span><\/p>\n

Simplified Machine Design & Build<\/h3>\n

Eliminating the coupling reduces part count, assembly time, and alignment tooling requirements. For OEM machine builders, this translates directly into lower machine BOM cost and faster production assembly \u2014 particularly valuable when the same drive configuration is repeated across a production line of dozens of machines.<\/p>\n<\/div>\n

03<\/span><\/p>\n

Rugged FC25 Cast Iron Housing<\/h3>\n

Identical material and dimensional specification to the WPA solid-shaft series \u2014 FC25 grey cast iron providing outstanding impact resistance and vibration damping. The WPKA delivers the same heavy-duty durability in the same compact foot-mounted footprint, with hollow shaft as the only structural difference.<\/p>\n<\/div>\n

04<\/span><\/p>\n

Precision Worm & Wheel for Smooth Torque<\/h3>\n

Ground 20CrMnTi worm and ZCuSn10Pb1 bronze wheel to ISO 1328 Grade 7 tolerances deliver smooth, low-noise (\u226472 dB(A)) torque at transmission efficiencies of 60\u201390% depending on ratio. High-ratio self-locking (\u22651\/30) is also available for agitator positioning applications.<\/p>\n<\/div>\n

05<\/span><\/p>\n

Wide Bore Size Range<\/h3>\n

Hollow bore diameters range from 16 mm (size 40) to 110 mm (size 250), covering the vast majority of industrial shaft diameters used in mixer, agitator, and feeder applications. Output torques from 17 Nm to over 2,300 Nm span the full industrial requirement spectrum.<\/p>\n<\/div>\n

06<\/span><\/p>\n

Five Input Shaft Directions<\/h3>\n

Standard positions A through E allow the WPKA to accept input from any direction, accommodating horizontal, inclined, and vertical motor positions in machine layouts where space constraints prevent standard motor placement.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Industry Applications<\/h2>\n

The WPKA hollow shaft worm reducer excels wherever a coupling-free output shaft connection reduces machine complexity:<\/p>\n

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Industrial Mixers & Agitators<\/strong>Chemical, paint, food, and pharmaceutical mixing vessels where the hollow shaft slides directly onto the impeller shaft, eliminating the coupling and simplifying the mixer gearbox head assembly.<\/span><\/div>\n

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Screw & Auger Feeders<\/strong>Bulk powder and granule feeders in plastics, food processing, and cement production where the WPKA mounts directly over the conveyor screw shaft without a separate coupling hub.<\/span><\/div>\n

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Conveyor Roller Drives<\/strong>Live-roller conveyor sections where the WPKA’s hollow bore accepts the roller shaft end, providing a clean, low-profile drive arrangement without protruding coupling hardware.<\/span><\/div>\n

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Animal Feed & Livestock Equipment<\/strong>Feed conveyor drives, mixing drum drives, and silo discharge screw drives in agricultural facilities where simple, robust coupling-free gearbox mounting is preferred for ease of field maintenance.<\/span><\/div>\n

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Cosmetics & Personal Care<\/strong>Cream and lotion mixing vessel drives, filling machine feed screws, and blending paddle drives in cosmetics manufacturing requiring smooth, quiet, compact drive integration.<\/span><\/div>\n

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Waste & Recycling Equipment<\/strong>Shredder pre-feed conveyors, rotary trommel screen drives, and compactor screw drives where hollow shaft mounting simplifies integration into custom machine frames.<\/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. The hollow bore is dimensionally verified to H7 tolerance using calibrated plug gauges at final inspection \u2014 ensuring correct shaft-to-bore fit without on-site reaming or modification.<\/p>\n<\/div>\n

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Bore Tolerance & Concentricity Test<\/h3>\n

Each WPKA unit is verified for bore diameter to H7 tolerance<\/strong> (go\/no-go gauge) and bore-to-shaft concentricity<\/strong> (\u22640.05 mm TIR) relative to the gearbox output centreline. This ensures the driven shaft runs true within the bore without inducing additional bearing loads.<\/p>\n<\/div>\n

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Material Standards<\/h3>\n

Housing: FC25 cast iron (\u2265250 MPa). Worm shaft: 20CrMnTi (\u226558 HRC). Worm wheel bore: precision-bored worm wheel hub. Full material mill certificates available on request for food and pharmaceutical industry compliance documentation.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Why Choose Ever-power for WPKA Hollow Shaft Gearboxes<\/h2>\n
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\"Ever-power<\/div>\n
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We supply WPKA hollow shaft worm gearboxes to mixer OEMs, conveyor equipment builders, and agricultural machinery manufacturers in Korea, Mexico, Germany, Australia, and over 60 countries worldwide. Our in-house internal grinding capability ensures every hollow bore is machined to H7 tolerance in a single clamped operation \u2014 maintaining concentricity and eliminating multi-step machining errors.<\/p>\n