GJJ vs Alimak vs STROS — Construction Hoist Brand Comparison for UAE High-Rise Builds

Look up the facade on any active Dubai high-rise — there’s a rack-and-pinion construction hoist climbing alongside the structure. Nine times out of ten it’s a GJJ; the tenth is usually Alimak or, increasingly, STROS. Same job — lifting people and material, cycling 60-100 times a day, getting extended every couple of weeks — but underneath the duty cycle the three are very different machines.

GJJ is a Chinese volume manufacturer that has owned the MENA mid-market for two decades. Alimak is the Swedish heritage brand whose name became a generic for the whole category. STROS is a Czech mid-market European OEM with a strong twin-cage range and a growing UAE footprint. The brand pick reshapes 24 months of logistics — parts lead times, electrical demand, TPI document packs and end-of-project resale all shift with it.

For the broader sizing framing, the UAE construction-hoist buyer’s guide is the prerequisite. For why “Alimak” is used generically, see the Alimak brand-confusion post.

Brand provenance — three design heritages

GJJ — Hunan GJJ Lifts & Hoists, founded early 1990s in Changsha, China. The dominant rack-and-pinion hoist exporter from China since the mid-2000s, and the largest installed base of any single OEM in MENA. Range: SC100 (material-only), SC200 single, SC200/200 twin, SCD320 and SCD500 heavy / high-rise lines with VFD drives and reinforced masts.

Alimak — Founded 1948 in Skellefteå, Sweden. Merged with Hek B.V. 2008, rebranded Alimak Group 2017. So historically dominant that “alimak” is used generically across MENA the way “Kleenex” refers to tissue. Construction range centres on the Scando 650 family — single and twin cage, 1,500-3,200 kg per cage, fixed-speed and FC-HE (frequency-controlled, high-efficiency) variants, lift heights past 450 m.

STROS — STROS-Sedlčanské strojírny a.s., Sedlčany, Czech Republic. Rack-and-pinion hoists since the 1960s, known for the NOV twin-cage range and SHE-K series. Targets the segment between Alimak’s premium and the Chinese OEMs’ cost leadership — European engineering at lower capex, VFD drives standard on current models. UAE installed base smaller than GJJ or Alimak, but growing.

Configurations side-by-side

Comparison only makes sense at the model level. Below are the units we see, quote and service on UAE high-rise sites, like-for-like by class.

Twin-cage capacity figures reflect each cage independently. Power supply differences (380V GJJ, 400V Alimak / STROS) all work on the UAE 415V grid via a site transformer; the inrush profile of a fixed-speed GJJ vs a VFD FC-HE drives different feeder cable sizing. Mast pitch is nominally 1,508 mm across all three — which is why specs read as if parts might swap. They don’t. Tubing, gussets, bolt patterns and rack mounting are all OEM-proprietary.

For a tighter two-model pairing on the GJJ twin line, see the GJJ SC200/200 vs ORBIT OTH-2024 comparison.

Drive systems — the real divider

The biggest engineering difference between a current Alimak Scando 650 FC-HE and a standard GJJ SC200/200 isn’t the cab finish — it’s the drive.

Fixed-speed motor-brake stack (classic GJJ SC200, fixed-speed Scando 650): three induction motors per cage (typically 3 × 11 kW on SC200/200) drive the rack through gearboxes. Direct contactor switching with mechanical brake engagement at each stop. Robust, low component count, easy to service. Trade-offs: firmer ride at stops, higher brake-pad and gearbox wear, full motor starting current every cycle.

VFD (variable frequency drive) — Alimak FC-HE, STROS NOV, GJJ SCD: motor speed is controlled by varying AC frequency. The cage accelerates smoothly, mechanical brakes hold only when stationary, and the system recovers 15-25% of motor energy back to the grid on a balanced-cycle profile.

Practical implications: ride quality matters most on hospitality builds; brake and gearbox wear drops to half of fixed-speed; lower VFD inrush reduces feeder cable sizing on multi-hoist sites; regen savings on 24 months land in AED 30-80k; VFD fault-finding needs a qualified technician with the parameter set. A 25-floor mid-rise on 16 months rarely recovers the VFD premium — fixed-speed GJJ SC200/200 is the cleaner buy. A 60-floor supertall over 36 months almost certainly does; Alimak FC-HE or STROS NOV-series VFD is the right call.

Anti-fall safety devices — brand-specific lifelines

Every rack-and-pinion hoist runs an anti-fall safety device — a centrifugal governor mechanically linked to the rack that triggers a wedge-style emergency brake if descent speed exceeds a preset threshold. Mandatory under EN 12159 / EN 81-43 and recognised by Dubai Municipality and Trakhees. Governors are brand-proprietary:

• GJJ: SAJ40 (2,000 kg cages) and SAJ60 (3,200 kg cages). Progressive centrifugal type, 3-year hard service life.
• Alimak: proprietary GFD (Governor Fall Device) range, capacity-matched to Scando 650. Same regulatory cadence as SAJ.
• STROS: proprietary progressive governor built to EN 81 / EN 12159 — comparable function, different mechanical signature.

Replacement procurement is where the brand pick bites. HOE keeps GJJ SAJ40 / SAJ60 in Dubai stock at AED 4-8k each, same-day UAE dispatch. Alimak GFD replacements run AED 18-28k each, 4-6 week lead from European warehouses. STROS governors sit between at AED 10-16k, 2-4 week lead.

Drop-test cadence is identical across brands — monthly functional verification, annual TPI recertification, mandatory full replacement every 3 years from date of manufacture regardless of test results. For the full SAJ procedure, see the dedicated SAJ40 / SAJ60 anti-fall safety device guide.

Spare-parts depth in MENA

A hoist that can’t lift is a site queueing crew at the hoarding instead of building floors. Parts depth drives programme certainty more than the spec sheet acknowledges.

GJJ — deepest regional ecosystem. HOE keeps the full critical stack on the Dubai shelf: motors, gearboxes, SAJ40 / SAJ60 governors, rollers, cabin doors, contactors, limit switches, brake assemblies. Same-day UAE dispatch; cross-supply with regional dealers makes unusual SKUs reachable inside 48 hours.

Alimak — supported but slower. Lead-time 1-3 weeks ex-Europe for structural and electronic parts, 4-6 weeks for FC-HE drive electronics. HOE stocks Alimak-compatible third-party parts (governors, rollers, doors) at 40-70% of genuine-OEM cost for non-structural items.

STROS — comparable cost to GJJ, smaller cross-supply pool. Standard wear items have 1-3 week lead through the STROS distribution network. Plan a slightly larger on-site spares kit than for GJJ.

Real-world impact when a brake fails: GJJ — Dubai stock typically 4-8 hours, half a shift lost. Alimak — brand-compatible spare on hand 4-8 hours, ex-Europe 5-15 days. STROS — 1-3 days via the European supplier unless a kit was on site.

This dynamic is why we default to GJJ on time-sensitive UAE high-rise residential. Broader procurement principles apply on the crane side too — see the tower-crane spare-parts procurement guide.

Capex, opex and 24-month TCO

Indicative figures for a Dubai-stocked twin-cage P&M over 24 months, spec matched as closely as possible: ~2,000 kg per cage, ~150-200 m lift.

VFD energy advantage on the Alimak FC-HE closes roughly AED 15k of the gap over 24 months — meaningful but not category-changing. Bigger lifecycle drivers are capex, parts and maintenance. On 24 months, GJJ wins by AED 545k against Alimak and AED 153k against STROS.

Stretch to 36+ months and the gap narrows: Alimak’s service life past year 5 reduces parts allowance, energy savings compound, resale stabilises. For industrial or multi-project installs past 5 years, Alimak’s math works harder. For the related question — when twin-cage pays back versus single-cage — the twin-cage vs single-cage economics post breaks it down by project profile.

Erection and commissioning

OEM spec sheets show similar erection-day counts; on a clean site with a competent crew that holds true. The real schedule drivers are base-frame footprint and crew familiarity. GJJ SC200/200 base is ~4.5 × 5.2 m; Alimak Scando 650 ~5.0 × 5.5 m; STROS NOV 1000 similar to GJJ — on constrained Dubai sites, half a metre matters. All three use 6-9 m wall-tie spacing, but fixing-angle hardware and moment-load envelopes differ; reaction-force pack quality goes Alimak (most detailed) > STROS (European-standard thorough) > GJJ (functional). A crew that has put up 50 GJJ this year is faster on the 51st than on a first Alimak — budget half a day extra on a first deployment of an unfamiliar brand, and another half-day buffer for TPI inspector familiarisation.

Indicative erection time, foundation-pad ready to commissioning sign-off: GJJ SC200/200 5-7 days; Alimak Scando 650 FC-HE 6-8 days (FC-HE parameterisation adds a day); STROS NOV 1000 5-7 days. Climbing extensions are 4-6 hours across all three.

Inspection and TPI implications

UAE TPI cadence is brand-agnostic — accredited bodies (Bureau Veritas, SGS UAE, TUV Rheinland, TUV SUD, Applus Velosi, Lloyd’s Register) inspect every active hoist annually under Dubai Municipality circular DM-PH&SD-P4-TG21, the equivalent Trakhees framework on PCFC territories, or OSHAD in Abu Dhabi.

The brand difference is in the document pack. GJJ packs are functional but historically Chinese-translated — inspectors sometimes ask for English clarifications on unfamiliar variants; HOE supplies these as needed. Alimak packs are the gold standard, cross-referenced to the spare-parts catalogue with detailed service-interval notes, and TPI moves quickly. STROS packs match Alimak in completeness — European-standard documentation, thorough service-interval matrices, clear safety-device test logs.

TPI scope is the same on all three: structural integrity, drive condition, safety-device function, electrical safety, and load testing (110% SWL periodic, 125% for new). Document quality changes inspection speed, not pass/fail.

Best-fit pick by project type

Two threads run across the table: project duration drives whether the Alimak premium amortises, and spec wording determines whether STROS is in the running at all.

The honest verdict — typical 40-floor Dubai residential

For the most common Dubai high-rise profile — 40-floor residential, 100-130 worker peak headcount, 24-30 month timeline — the default is GJJ SC200/200 twin-cage with the high-speed motor upgrade, supplied from HOE Dubai stock.

Alimak Scando 650 FC-HE is the better-engineered machine, but the premium doesn’t pay back over the project duration. STROS NOV 1000 is competitive on engineering, but regional parts cross-supply isn’t yet thick enough to match GJJ on programme certainty. The GJJ hits the throughput target, the parts ecosystem absorbs mid-project breakdowns, and the resale at month 30 is straightforward.

The recommendation changes if the spec mandates Alimak brand (source Scando 650, negotiate to “Alimak-equivalent” if the contract permits), if the build is supertall (60+ floors, 250+ m lift — VFD efficiency and longevity start mattering more than capex), if the deployment runs 36+ months (Alimak’s longevity premium amortises), or if the cab matters for hospitality and luxury commissioning (move to Alimak or ORBIT).

Getting started

HOE supplies, erects, services and dismantles all three brands across UAE high-rise and industrial sites. Whichever brand fits the project, our engineers run the math against the lift envelope, schedule, headcount and budget — and give the recommendation that works for the deployment, not the brand with the loudest recognition.

Send the project parameters to sales +971 50 144 4810 or the contact form: building height and floor count, peak headcount, duration, site location, brand preference (or “open — recommend”), and spec wording if mandated.

48-hour turnaround on the quote with model recommendation, indicative pricing across the three brands, Dubai-stock availability, foundation-pad reaction-force pack and lifecycle cost projection. For existing units needing maintenance, parts or breakdown support across any brand, the 24/7 breakdown line is +971 4 880 3079. The full hub of HOE hoist resources is at /hoists; supply, erection, climbing and dismantle at /services#sales-supply. The FAQ below covers brand popularity, VFD pay-back, parts logistics, drop-test cadence, cross-brand parts, resale, erection time, and the 40-floor Dubai residential recommendation.