Planetary gearbox pricing on active B2B platforms in Q2 2026 spans roughly US$30 per piece for 76 mm IP65 DC solar-tracker micro units (2-piece MOQ) to US$1,000+ for cast-iron Bonfiglioli-pattern splined-shaft units at 1-piece MOQ, with a mid-tier P62m-class gearbox listing at US$80/piece FOB at 10-box MOQ from a Shanghai supplier [S3][S2].
The order-of-magnitude spread — about 30× between the smallest and largest catalogue entries observed — is driven by torque class, ratio stages, backlash grade, and whether the gearbox ships as a bare reducer or as a servo-matched gearhead with an integrated motor [S3][S4][S6].
What buyers actually pay: three pricing tiers in the 2026 catalogue
Public listings divide cleanly into three bands. The micro/servo-gearhead tier (12–24 V DC, 1–5 Nm output) sits at US$30.00–50.00 per piece for 76 mm OD planetary gearboxes rated 2 Nm, 600 rpm, 120 W output, IP65, typically sold in 2-piece MOQ lots and aimed at solar trackers, small pumps, and toy/consumer gear-motor applications [S3]. The mid industrial tier, including cast-iron P-series-pattern units with splined output shafts in the Bonfiglioli form factor, lists at US$1,000 per piece at 1-piece MOQ, with wooden-case export packaging. A third tier — compact P-class units with similar mounting interfaces to the European PE series — is quoted in the US$80-per-piece range at 10-box MOQ from Shanghai-based Landing Planetary Gearbox Limited (ISO 9001, registered 2015) [S2].
For context, the PE planetary gearbox from Stm Spa (Italy) — a 4-stage combined unit delivering reduction ratios beyond the standard P and PL series — covers torque bands of 2–5 kNm, 5–10 kNm, and above 10 kNm at 0.4–11.2 kW (0.54–15.23 hp) input power, and is positioned for screw conveyors, mixers, lifts, and slow-handling displacements where compact radial dimensions matter [S1]. A buyer cross-referencing a European PE-class spec against the Shanghai US$80 tier should not assume torque equivalence; the European unit's published kNm ratings are two to three orders of magnitude above the small-batch Chinese catalogue offerings [S1][S2].
Cost drivers that move the number, not the catalogue description
Five factors separate the US$30 listing from the US$1,000+ listing. First, torque density: a 2 Nm DC micro unit and a 2 kNm industrial reducer share a gear-train topology but use different bearing spans, case rigidity, and gear material — the planetary reducer reference page on SourceBySpec details how output planet-carrier double-support design drives torsional rigidity up sharply with frame size. Second, reduction-ratio count: the Stm PE combines 2 planetary reduction stages on the input of a P-series base, producing a 4-stage gearbox that pushes available ratios well beyond the P and PL limits [S1]. Third, backlash grade: precision servo gearheads from manufacturers such as TQG (20+ years specialised) and Assun Motor target sub-arc-minute backlash for servo applications and command a price premium over general-purpose cast units [S4][S6].
Fourth, mounting standard and shaft finish — splined output shafts, foot-flange combinations, and IEC/NEMA input adapters all add machining cost; the Bonfiglioli-pattern splined-shaft unit is a clear example of a mounting-standard premium. Fifth, lot size and packaging: a 2-piece MOQ at US$30–50 versus a 1-piece MOQ at US$1,000 is not directly comparable on unit price; a buyer should re-base to a 50- or 100-piece hypothetical quote to compare tiers fairly [S3]. For buyers specifying gearbox packages, that MOQ re-basing is usually the single largest hidden cost swing.
Selection criteria: matching the price tier to the application
Match torque to peak load, not to nameplate motor power. A 2 Nm, 600 rpm DC unit is correct for a small solar tracker or a vending-machine dispenser and is not a substitute for a 2 kNm screw-conveyor drive, regardless of the planetary name [S3][S1]. Match ratio to output-speed requirement, including any need for very slow handling — this is exactly the application Stm cites for its high-ratio PE (screw conveyors, mixers, lifts, displacements) [S1]. Match backlash to the system's positioning repeatability: a conveyor can accept 10–20 arc-min backlash, while a CNC rotary axis or a robot joint typically requires single-digit arc-min or better, the territory of the precision planetary gearhead suppliers [S4][S6].
Match environment to sealing. IP65 is sufficient for outdoor solar-tracker service, but washdown food-grade or marine gearbox duty typically requires IP66/IP67 plus corrosion-resistant coatings; buyers should not infer sealing from a catalogue headline photo [S3]. Match certification to destination market — the European PE supplier publishes kNm and kW ratings, while a Shanghai ISO 9001 factory listing is a different paperwork profile [S1][S2].
Comparison: three representative offerings at a glance
The three units below are not equivalent and should not be compared on price alone; they illustrate the spec bands buyers actually see in 2026 listings. [S1]
Mini DC servo gearhead, 76 mm OD, 2 Nm / 600 rpm, 120 W, IP65, 12–24 V DC — US$30.00–50.00, 2-piece MOQ, solar-tracker / small-pump use case, sourced from Changzhou Smart Automation [S3]. Mid-tier P-pattern cast unit, splined output shaft, Bonfiglioli form factor — US$1,000, 1-piece MOQ, wooden-case export pack, suitable as a direct mechanical replacement in mid-power industrial lines. P62m-class compact unit, P-series mounting, FOB US$80/piece at 10-box MOQ, supplier Landing Planetary Gearbox Limited (Shanghai, ISO 9001, registered 2015) — competitive for OEM volume runs of compact drives [S2].
For deeper application logic, the planetary gearbox selection note on torque, ratio, backlash and stage trade-offs covers the engineering rationale behind the band choices summarised above.
Who this pricing fits, and who it does not
These 2026 catalogue prices fit OEM buyers running 50–5,000 piece annual volume on standardised mounting interfaces, who can absorb 4–8 week ocean freight from East-Asian suppliers and who have in-house incoming-inspection capacity for backlash, runout, and IP-rating verification [S2][S3]. They also fit system integrators building small solar trackers, light conveyor skids, and small AGV drive modules where 2 Nm class units are correct [S3].
The pricing does not fit buyers needing documented kNm-class torque with European or North-American traceability, food-grade or ATEX/IECEx certification, or 24-hour spare-parts responsiveness — those buyers should request formal quotes from the European tier (Stm Spa PE-class) and budget a 3–10× premium over the comparable-nameplate Chinese catalogue entry [S1]. Engineers cross-referencing into adjacent motion components will find related cost logic in the spherical roller bearing price 2026 note and the pillow block bearing selection piece.
Limitations, sourcing risks, and what to verify before paying
Three constraints bite every cross-border quote. Published FOB prices assume sea-freight lot sizes and exclude duty, brokerage, and last-mile inland haul; landed cost on a US$80/piece unit can realistically land within ±15% of that figure once those are added, but a US$30 piece shipped by air in low volume can easily double [S2][S3]. MOQ re-basing changes the unit price sharply: the US$30–50 micro unit is listed at 2-piece MOQ, the splined-shaft unit at 1-piece MOQ, and the P62m at 10-box MOQ — a 50-piece ask from the lowest-MOQ supplier is not a 50-piece price [S3][S2].
Certification paperwork is the third risk. A Q2 2026 listing may show older certificate dates (KC valid since 2022-06-08, RoHS since 2022-06-21 per the made-in-china index) — buyers should request the current certificate PDF and verify validity directly with the issuer rather than relying on the listing badge [S3]. For buyers also evaluating the manufacturing side, the aluminum die casting selection guide covers the upstream casting supply chain that feeds planetary gearbox housings.
Standards, traceability, and the paperwork behind the price
Planetary gearbox design is not governed by a single mandatory standard analogous to ATEX or API 6D, but several adjacent references do apply depending on end use. Gear accuracy in precision servo gearheads is commonly graded against AGMA or ISO 1328 gear-quality classes, backlash against manufacturer-published arc-minute figures, and surface treatment against ISO 6336 / ISO 1403 for load capacity calculation. For industrial installs, ISO 9001 quality management is the baseline factory certification buyers should expect; the Shanghai Landing supplier explicitly lists ISO 9001 in its profile [S2]. For servo gearheads sold with an integrated brushless DC motor, EMC compliance (EN 55011 / EN 61000-6-x series) and RoHS apply in the EU market, while KC and PSE cover Korean and Japanese destinations respectively [S3][S6].
For a buyer sourcing a planetary reducer that will integrate with a linear guide or a crossed roller guide in a precision stage, the gearbox's backlash figure should be reviewed against the downstream positioning budget, not in isolation.
Trackable signals for the next planning cycle: a quote from a Chinese supplier on the P62m-class platform at 50-piece volume with FOB Shanghai and 30-day lead time; a confirmed IECEx or ATEX variant of a kNm-class reducer for European hazardous-area builds; and the next update of the Bonfiglioli-pattern splined-shaft listing (current at US$1,000, 1-piece MOQ, wooden-case pack as of 2026-06-27) for any price or MOQ movement [S2].