WDKA and WDKS Series worm gear reducers-4

WDKA and WDKS Series worm gear reducers

The WDKA/WDKS series extends the WDK zero-backlash coupling concept into the realm of shock loads—the WDKA features the WA class with a deeper bore depth, while the WDKS utilizes the WS class with the deepest bore depth and, starting from size 80, is equipped with tapered roller output bearings. The series covers sizes 40–175 and gear ratios ranging from 10:1 to 60:1.

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Description

The WDKA and WDKS Series worm gear reducers extend the WDK zero-coupling concept into shock-load territory. Where the WDK carries a standard bore depth suited for smooth continuous drives, the WDKA and WDKS step up bore engagement substantially — the WDKA to WA-class depth, the WDKS to WS-class depth with tapered roller output bearings from size 80 onwards. Both variants retain the IEC B5 motor flange input, requiring no input coupling. Size 40 is unique to this series within the WD range, extending coverage down to 0.12 kW for small-frame shaft-mounted applications where motor flange input and deep bore engagement are both required simultaneously. Covering sizes 40–175, up to 7.5 kW, bore diameters Ø20–Ø80 mm across all standard ratios. For Australian grain handlers, mineral processors, and heavy agricultural machinery operators across Sydney, Melbourne, Brisbane, Perth, and Adelaide where shock loads, stone strikes, and belt-jam events are routine, the WDKA and WDKS specify the correct bore depth from the first season. Manufactured to ISO 9001:2015, designed per AGMA 6034, and supplied by Ever-Power Worm Gear Reducer Co., Ltd. (Australia), 27 Harley Crescent, Condell Park NSW 2200.

WDKA and WDKS Series worm gear reducers

WDKA & WDKS Series — IEC Flange Input, Deep Hollow Bore Output

Technical Specifications — WDKA & WDKS Series

WDKA — WA-Class Deep Bore

IEC B5 flange input + WA-class bore depth (HL-WDKA). Best for moderate shock, standard bore engagement requirements.

WDKS — WS-Class Deep Bore + Tapered Rollers

IEC B5 flange input + WS-class bore depth + tapered roller output bearings from size 80. For heavy shock, chain drives, reversals.

Per ISO 9001:2015, AGMA 6034, IEC 60034-7. Bore H7/DIN 286. ★ = tapered roller output bearing at size 80+.

Size Power (kW) Ratio A (mm) B (mm) H (mm) HL-WDKA (mm) HL-WDKS (mm) Flange LZ (mm) Bore Ø (mm) Weight (kg)
40 0.12 10:1–60:1 138 90 135 45 60 140 Ø20 5
50 0.18 10:1–60:1 155 107 165 50 80 140 Ø20 8.5
60 0.37 10:1–60:1 170 117 195 60 93 160 Ø25 11
70 0.37–0.75 10:1–60:1 206 131 233 73 108 160–200 Ø30 17
80 ★ 0.75–1.5 10:1–60:1 232 144 268 83 123 200 Ø35 26
100 ★ 1.5 10:1–60:1 266 175 330 150 190 200 Ø40 39
120 ★ 2.2–3.0 10:1–60:1 340 200 395 180 230 250 Ø45 60
135 ★ 3.0–4.0 10:1–60:1 375 212 455 215 250 250 Ø60 88
155 ★ 5.5 10:1–60:1 442 312 493 235 280 300 Ø70 120
175 ★ 7.5 10:1–60:1 465 334 558 260 310 300 Ø80 160

★ Sizes 80+ (WDKS): tapered roller output bearing for combined radial + axial load capacity.

WDKA vs WDKS vs WDK — Choosing the Right Bore Depth

WDKA and WDKS Series worm gear reducersWDKA and WDKS Series worm gear reducers-4

WDKA and WDKS — Bore Depth and IEC Flange Detail

Feature WDK WDKA WDKS
Input IEC B5 flange IEC B5 flange IEC B5 flange
Bore depth class WK-standard WA-class deeper WS-class deepest
HL at size 100 80 mm 150 mm (+88%) 190 mm (+138%)
Output bearing (80+) Ball bearing Ball bearing Tapered roller
Service factor SF ≤ 1.25 SF 1.25–1.5 SF 1.5–2.0
Size range 50–155 40–175 40–175

The WDKA and WDKS are both IEC flange input units built on the W series housing convention — the key differentiator from the WDK is bore engagement depth. The WDKA’s WA-class bore depth is appropriate for moderately shock-loaded applications (SF 1.25–1.5); the WDKS’s WS-class bore depth with tapered roller output bearings is the specification for severe shock (SF 1.5–2.0), sustained chain tension, and regular reversals. Size 40 is the smallest available in the entire WDK/WDKA/WDKS range — unique to these deep-bore variants — providing coverage from just 0.12 kW for compact machinery requiring IEC flange input plus deep hollow bore engagement simultaneously.

WDKA and WDKS Series worm gear reducers

WDKA & WDKS — Complete Assembly with Motor Flanged On

Selection Guide — When to Specify WDKA vs WDKS

Specify WDKA when:

  • Service factor is 1.25–1.5 (moderate shock, occasional reversals)
  • Standard WDK bore depth has shown fretting in service — WDKA is the direct step-up
  • Application is a smooth conveyor or mixer drive where the IEC motor must flange directly and a deeper bore is desirable for shaft engagement length reasons
  • Size 40 (0.12 kW) is required — the smallest IEC flange + hollow bore unit in the W family

Specify WDKS when:

  • Service factor is ≥ 1.5 (heavy shock, stone strikes, belt jams, regular reversals)
  • Input power is ≥ 0.75 kW at sizes 80+ where tapered roller bearings provide measurably better bearing life under combined radial and axial torque arm reaction loading
  • Application is grain auger, mining feeder, vibrating screen, or agricultural implement drive where bore fretting is the documented primary failure mode
  • IEC motor flanges directly to the reducer AND the output shaft is chain or belt loaded simultaneously

Applications in Australian Heavy Industry

  • Grain and fertiliser auger drives (QLD, NSW, SA, WA): WDKS 80–135 where IEC motor must mount directly in confined grain shed spaces, and the WS-class deep bore handles stone-strike shock at harvest. The size 40 WDKA covers small-frame seed metering drives from just 0.12 kW.
  • Mining screen and feeder shaft drives (WA, QLD): WDKS 120–175 on vibrating screen head shafts in Pilbara iron ore and Queensland coal operations — tapered roller output bearings at size 120+ sustain the combined shock and torque arm reaction loads that fail ball-bearing-equipped units within months.
  • Agricultural implement PTO drives (QLD, NSW, VIC): WDKA 60–100 on seeder metering shafts and crop residue spreader drives where the IEC motor must mount compactly and the driven shaft requires deeper bore engagement than the WDK provides for reliable non-fretting service across an entire growing season.
  • Food processing shock-start drives (Sydney, Adelaide, Melbourne): WDKA 60–100 on mixing vessel shaft drives with DOL motor starts, where the deeper WDKA bore prevents bore fretting during the start torque spike that standard WDK units cannot absorb without surface damage.

WDKA and WDKS Series worm gear reducers-3_1

WDKA & WDKS — Australian Heavy Industrial Applications

What Australian Customers Say

★★★★★

“WDKS 120 on our SA grain auger drive — 3.0 kW 112B5 motor flanges directly, WS-class bore handles stone-strike loads that destroyed two WDK units in 14 months. 20 months without bore damage. The tapered rollers at size 120 make the difference under our reversing loads.”

— Lisa B., Agricultural Engineer, Yorke Peninsula SA

★★★★★

“WDKS 155 on our Pilbara vibrating screen — the combination of IEC motor direct mount, 280 mm deep bore, and tapered rollers handles our continuous ore shock loading. 16 months of two-shift operation without a single bearing or bore failure. The IEC flange eliminates the coupling in the dusty drive bay.”

— Craig L., Site Engineer, Pilbara WA

★★★★☆

“WDKA 60 on our Melbourne DOL-start mixing vessel shaft drives. The deeper WA bore handles the start torque spike without the fretting marks we got on WDK units. 18 months without issues. One star less because the size 40 (0.12 kW) we needed for a small seeder drive required a 2-week lead time.”

— Rachel B., Process Engineer, Melbourne VIC

★★★★★

“WDKS 100 on our Brisbane chain conveyor head shaft — IEC 90B5 motor flanges on, 190 mm deep bore holds the shaft engagement without fretting under our chain tension loads. The tapered roller bearings at size 100 are why this works where the ball-bearing WDK failed.”

— Brett M., Conveyor Engineer, Brisbane QLD

WDKA and WDKS Series worm gear reducers

Why Choose Ever-Power for WDKA & WDKS in Australia?

Ever-Power Worm Gear Reducer Co., Ltd. (Australia) at 27 Harley Crescent, Condell Park NSW 2200 stocks WDKA and WDKS units across common frame sizes for 5–10 business day dispatch. Our engineering team provides free WDK vs WDKA vs WDKS bore depth analysis and IEC flange compatibility confirmation in one written recommendation within one business day. Visit About Us and technical reference at worm-gearbox.top.

Frequently Asked Questions — WDKA & WDKS Series

1. Why does size 40 only exist in WDKA/WDKS and not in WDK?+
Size 40 is included in the WDKA/WDKS range because these deep-bore variants are specifically targeted at applications where bore fretting is a concern — and at size 40 (0.12 kW), there are agricultural seeder metering drives and small conveyor shaft drives in Australia that need precisely this combination: IEC motor flange input and deep bore engagement in a very small frame. The standard WDK at size 40 would provide a shorter bore depth that, at the limited shaft diameters involved (Ø20 mm), offers only marginal engagement. The WDKA’s size 40 provides 45 mm bore depth and the WDKS provides 60 mm — both meaningfully deeper than the WDK-class standard depth at this frame, and both sufficient for reliable engagement on small agricultural and food processing shaft drives.
2. Is WDKS a drop-in replacement for WDKA at the same frame size?+
Yes — WDKA and WDKS share identical external dimensions at every frame size. Same housing height, same centre distance, same foot-mount bolt pattern, same IEC flange LA, same bore diameter Ø. The differences are internal: bore depth HL (WDKS deeper) and output bearing type (WDKS uses tapered rollers from size 80). This means the WDKS is a direct drop-in upgrade for any WDKA installation that is experiencing bore fretting or output bearing failure under combined loading — no changes to machine base, motor, or driven shaft arrangement required.
3. Can WDKS be supplied with a shrink disc for zero-clearance bore engagement?+
Yes — shrink disc engagement is available for WDKS bore sizes Ø35 mm and above (sizes 80–175). For maximum shock resistance, specify both the WDKS (deep bore + tapered rollers) AND a shrink disc — the combination completely eliminates bore fretting by removing the clearance that allows micro-movement, while the deeper bore provides maximum friction surface area for the shrink disc clamping force. This two-layer approach — deep bore plus shrink disc — is the preferred specification for WDKS units on Australian mining screen drives and heavy reversible grain conveyors. Specify at order time with driven shaft diameter.
4. What makes WDKS better than WPDKS for a W-convention legacy machine upgrade?+
If your machine was built around W-series dimensional standards — W-series housing height, W-convention bore diameters (Ø20–Ø80 mm), W-series foot-mount bolt pattern — the WDKS is the correct upgrade because it maintains all those W-convention dimensions. The WPDKS uses WP-family dimensions (different housing height, WP-convention bore diameters, different foot-mount bolt pattern) and will not fit the existing machine base without modification. Always specify WDKS for W-convention legacy machines and WPDKS for new designs or WP-convention machines. If unsure, send Ever-Power the existing unit’s centre distance (A dimension) and bore diameter — we confirm the correct series within one business day.

WDKA WDKS full product range all sizes Ever-Power Australia

WDKA & WDKS — Full Range, Ever-Power Australia

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