How do I select the right gearbox for conveyor and mixer drives in Saudi Arabia factories?

Gearbox selection for conveyor and mixer drives in Saudi Arabia factories starts with four key parameters: (1) Output torque — calculated from the driven equipment's required torque at running speed, multiplied by a service factor (SF typically 1.25–2.0 depending on shock loading and daily operating hours); (2) Speed ratio — determined by dividing the motor input speed (typically 960–1,480 rpm for 4- or 6-pole motors on 50 Hz KSA supply) by the required output shaft speed; (3) Mounting arrangement — foot-mounted (B3), flange-mounted (B5/B14), or shaft-mounted hollow-bore for direct coupling to conveyor drive shafts; (4) IP rating — minimum IP65 for dusty cement, flour, or mineral processing environments common in Saudi Arabia. For horizontal conveyors, a parallel shaft helical gearbox (foot or shaft mounted) is the standard choice for its high efficiency (≥97%) and low backlash. For bucket elevators and 90° drive applications, a helical-bevel right-angle gearbox is preferred. For mixers requiring frequent start-stop or high starting torque, a service factor of 2.0 or higher is recommended. Gulf Union Ozone stocks IEC-frame-compatible helical, helical-bevel, and worm gearboxes in output torques from 10 Nm to 100,000 Nm — equivalent to SEW Eurodrive, Nord, and Bonfiglioli — from our Jeddah warehouse for same-day dispatch to Saudi Arabia factories.

Shaft coupling misalignment tolerance comparison — jaw, grid, disc, and gear couplings for KSA industry

Choosing the right coupling for a Saudi Arabia industrial drive depends heavily on the misalignment present between motor and driven shaft, the torque level, and the sensitivity of the connected equipment. Here is a practical comparison: (1) Flexible jaw (spider) couplings — accommodate angular misalignment up to 1°, parallel offset up to 0.2mm, and axial end-float ±1mm. The polyurethane or hytrel spider element provides vibration damping and electrical isolation. Best for light-to-medium torque pump, fan, and mixer drives up to 5,000 Nm. Fail-safe by design. (2) Grid couplings — accommodate angular misalignment up to 1/3°, parallel offset up to 0.4mm. The steel spring grid element handles high torque and shock loads (peak torques up to 100,000 Nm) and damps torsional vibration. Best for crushers, conveyors, and heavy machinery. Requires grease lubrication. (3) Flexible disc couplings — accommodate angular misalignment up to 1°, parallel offset up to 0.15mm. Dry, non-lubricated, and torsionally rigid with zero backlash. Best for pump-motor and compressor-gearbox drives where alignment accuracy is maintained and vibration isolation is not needed. Torque range up to 500,000 Nm. (4) Gear couplings — accommodate angular misalignment up to 1.5°, parallel offset up to 0.5mm. High-torque density with lubricated crowned teeth. Suitable for kiln drives, mills, and rolling mill machinery. Gulf Union Ozone stocks all four coupling types in Jeddah for immediate supply to KSA industrial clients.

Worm gearbox efficiency and self-locking for valve actuator applications in KSA

Worm gearboxes are widely used in Saudi Arabia for gate drives, valve actuators, positioning tables, and conveyor systems where a compact right-angle drive and high reduction ratio are needed in a single stage. Key performance characteristics for KSA valve actuator applications: (1) Efficiency — worm gearbox efficiency varies significantly with ratio. At low ratios (5:1–10:1) efficiency is 70–85%; at medium ratios (20:1–40:1) efficiency is 50–70%; at high ratios (60:1–80:1) efficiency can fall to 30–50%. This lower efficiency means more motor power is needed compared to helical or bevel-helical alternatives, but the compactness and self-locking characteristic often justifies this for valve duty. (2) Self-locking — worm gearboxes with ratios above approximately 20:1 (depending on the lead angle) are inherently self-locking, meaning the output shaft cannot back-drive the input when the motor is de-energised. This is a critical safety feature for gate valves, dampers, and isolation valves in Saudi Aramco and SABIC pipeline facilities — preventing unintended valve movement under pressure differential. (3) Thermal rating — in Saudi Arabia's ambient temperatures of 45–50°C, worm gearbox thermal power ratings (based on oil sump temperature limits) must be derated or cooling fans specified to prevent overheating in high duty-cycle applications. Gulf Union Ozone stocks aluminium and cast iron worm gearboxes in ratios 5:1–80:1, IEC B5/B14 input flange, suitable for electric and manual valve actuator drives throughout the Kingdom.

Gearboxes & Shaft Couplings Saudi Arabia

Gearbox & Coupling Categories

Product Types in Stock

Gulf Union Ozone carries six core power transmission product categories covering helical and parallel shaft gearboxes, helical-bevel gearboxes, worm drives, flexible shaft couplings (jaw, grid, disc, and gear types), and precision speed reducers — covering the complete range of mechanical power transmission needs for Saudi Arabia industry.

Type 01

Helical & Parallel Shaft Gearboxes

Foot-mounted (B3), flange-mounted (B5/B14), and shaft-mounted hollow-bore helical gearboxes with IEC frame-compatible input shaft or motor flange. Gear ratios 4:1–200:1; output torque 10 Nm–100,000 Nm. Cast iron and ductile iron housings; case-hardened and ground helical gears; IP65 standard, IP66 optional. Efficiency ≥97% at full load. Equivalent to SEW Eurodrive R series, Nord SK, and Bonfiglioli VF/VS series. Suitable for conveyors, mixers, agitators, screws, and packaging machinery in Saudi Arabia food, cement, chemical, and general industry. Synthetic oil fill as standard for ambient temperatures in KSA up to +50°C. Thermal rating derated per operating conditions in Jeddah's high-ambient environment.

Type 02

Helical-Bevel Gearboxes

Right-angle helical-bevel gearboxes with IEC B5/B14 input flange and B5/B14/B3 output mounting. Helical gear first stages followed by spiral bevel final stage for high efficiency (≥96%) right-angle drives. Ratio range 5:1–1000:1 in single- and two-stage configurations; output torque 50 Nm–50,000 Nm. Hollow shaft and solid shaft output options; shrink disc locking for shaft-mounted versions. Aluminium housings (small frames) and cast iron (large frames). Applications include bucket elevators, conveyor right-angle drives, cooling tower fan gearboxes, and industrial drives throughout Saudi Arabia. Equivalent to SEW Eurodrive K series, Nord SK Bevel, and Bonfiglioli A series. Mounted with feet, torque arm, or flange for flexible installation in KSA plant layouts.

Type 03

Worm Gearboxes

Compact right-angle worm gearboxes with aluminium and cast iron housings. Self-locking variants available at ratios above 20:1 for gate drives, valve actuators, and positioning applications. Ratios 5:1–80:1 in single stage; multi-stage worm combinations for higher ratios. IEC B5/B14 input flange; hollow and solid output shaft; foot-mounted and flange-mounted options. Centre distances 30mm–300mm. AGMA Class 9 worm gear quality. Equivalent to Benzlers, Tramec, and Bonfiglioli W series. Lubricated with synthetic PAG or mineral oil (KSA high-ambient compatible). Applications include gate drives, valve actuators, conveyor tensioning, positioning tables, and small conveyor drives throughout Saudi Arabia's industrial facilities. Non-self-locking variants available with worm lead angles above 14° for reversible drives.

Type 04

Shaft Couplings — Flexible Jaw, Grid & Disc

Flexible jaw (spider) couplings: aluminium or GCI hubs with polyurethane (Shore 92A) or hytrel (Shore 62D) spider element; fail-safe by design; shaft diameter 5mm–180mm; zero-backlash for servo applications. NBK, KTR Rotex, and equivalent. Grid couplings: horizontal split, full-cover steel grid element (Falk Steelflex equivalent) for high-shock and vibration-damping applications in conveyors and crushers; up to 100,000 Nm. Flexible disc couplings: dry, non-lubricated stainless steel disc packs; accommodate angular, parallel, and axial misalignment; torsionally rigid with zero backlash; suitable for pump-motor and compressor-gearbox drives; torque range 50 Nm–500,000 Nm. Gear couplings: high-torque density crowned-tooth design, lubricated with grease, for kiln drives, mills, and heavy machinery up to 2,000,000 Nm. All coupling types stocked for same-day supply in Jeddah.

Type 05

Speed Reducers & In-Line Drives

Cycloidal speed reducers with ratios 6:1–658:1 in a single stage; extremely high torque density; shock-load capacity 500% of rated torque; zero backlash in needle-bearing cycloidal models. Suitable for indexing tables, robotic joints, and heavy conveyor drives in Saudi Arabia. Planetary gearboxes with backlash less than 3 arc-min for servo and precision positioning applications in CNC machine tools, automation, and robotics. Inline helical reducers (B3/B5/B14) for coaxial motor-gearbox arrangements in compressors, fans, and pumps where radial space is limited. Shaft-mounted gear units with shrink disc for direct conveyor drum or mixer shaft mounting — eliminating coupling and shaft extension. All speed reducers available with IEC and NEMA input flanges for Saudi Arabia's common motor frame standards.

Type 06

Gearbox Accessories & Spares

Gearbox oil — synthetic PAG ISO VG 220 and 460 lubricants rated for KSA ambient temperatures up to +50°C; mineral EP gear oil as alternative. Oil seals, shaft seals (FKM and NBR), and breather vents for gearbox maintenance. Torque arms and reaction rods for shaft-mounted gearbox installations. Shrink disc locking assemblies (SS 304 and carbon steel) for hollow shaft gearboxes. Input and output shaft sealing collars; motor adapter flanges (IEC B5/B14 in aluminium and cast iron). Coupling spider elements (PU, hytrel, polyamide) for jaw coupling maintenance. Grid element kits and grid coupling cover gaskets. All accessories stocked in Jeddah for fast maintenance supply to Saudi Arabia industrial plants and petrochemical facilities — minimising unplanned downtime on gearbox-driven equipment.

Product Catalog

Complete Gearboxes & Couplings Range — 30+ Products

All gearboxes and couplings supplied with dimensional drawings, technical datasheets, and ISO 9001:2015 quality documentation. CR 4030570569. Representative stock lines — contact us for specific frame sizes, ratios, and project quantities.

Product	Standard / Spec	Ratio / Torque	Mounting / IP	Application
Helical Gearbox — Foot-Mounted (B3)	AGMA 2001 / DIN 3960; IEC 72-1 input	4:1–200:1; 10–50,000 Nm output	B3 foot; IEC 56–280 frame input; IP65	Conveyors, mixers, agitators — Saudi Arabia food, chemical, and general industry
Helical Gearbox — Flange-Mounted (B5)	AGMA 2001 / DIN 3960; IEC B5 input	4:1–200:1; 10–50,000 Nm output	B5 flange input and output; IP65	Direct-mount to IEC motor and driven machine flange — compact drive assemblies
Helical Gearbox — Shaft-Mounted Hollow Bore	AGMA 2001; IEC B5 motor flange	4:1–200:1; 50–100,000 Nm	Hollow bore output with shrink disc; torque arm; IP65	Conveyor drum and mixer shaft direct mounting — eliminates coupling and alignment
Helical-Bevel Gearbox — Right-Angle B3/B5	AGMA 2001 / DIN 3960; ≥96% efficiency	5:1–1,000:1; 50–50,000 Nm	B3/B5/B14 output; B5/B14 input; IP65	Bucket elevators, right-angle conveyor drives — Saudi Arabia industry
Helical-Bevel Gearbox — Hollow Shaft Output	AGMA 2001; ≥96% eff.; shrink disc kit	5:1–1,000:1; 200–50,000 Nm	Hollow bore + torque arm or flange reaction; IP65	Shaft-mounted screw conveyors and agitator drives in KSA processing plants
Worm Gearbox — Aluminium Housing	AGMA 6022 / DIN 3975; B5/B14 input	5:1–80:1; 10–500 Nm output	B3/B5/B14 mounting; solid or hollow output; IP65	Gate drives, valve actuators, positioning — light-to-medium duty in KSA plants
Worm Gearbox — Cast Iron Housing (Heavy Duty)	AGMA 6022 / DIN 3975; centre distance 80–300mm	5:1–80:1; 200–5,000 Nm	B3/B5 mounting; solid output shaft; IP65	Industrial gate drives, heavy conveyor tensioning, self-locking valve operation
Flexible Jaw Coupling — PU Spider (KTR Rotex equiv.)	DIN 740-2; fail-safe; electrically isolating	Up to 15,000 Nm; shaft 5–180mm	Two aluminium hubs + PU spider; split covers optional	Pump-motor, fan-motor, and mixer drives — vibration damping; fail-safe operation
Flexible Jaw Coupling — Hytrel Spider (High-Temp)	DIN 740-2; Shore 62D hytrel; −40°C to +150°C	Up to 22,000 Nm; shaft 10–180mm	GCI hubs; torsionally stiffer than PU	High-torque and high-temperature drive applications in KSA industrial plants
Grid Coupling — Horizontal Split Cover (Falk Steelflex equiv.)	AGMA 9002; grease-lubricated spring grid	500–100,000 Nm; shaft 30–200mm	Split horizontal cover; grease nipple; keyway hubs	High-shock drives — crushers, conveyors, heavy industrial equipment in KSA
Flexible Disc Coupling — Stainless Disc Pack	API 671 / AGMA 9002; non-lubricated; zero backlash	50–500,000 Nm; shaft 20–400mm	SS 316L disc packs; spacer or close-coupled	Pump-motor and compressor-gearbox drives requiring precision and zero backlash
Gear Coupling — Crowned Tooth, Grease-Lubricated	AGMA 9008; crowned external tooth gear	1,000–2,000,000 Nm; shaft 40–500mm	Split sleeve or full coupling; grease nipple; keyway or spline	Kiln drives, ball mills, and heavy industrial machinery — KSA cement and mining
Cycloidal Speed Reducer — Single Stage	ISO 9001; needle roller bearing cycloidal disc	6:1–87:1 single stage; up to 658:1 two-stage; 500 Nm–10,000 Nm	Flange or foot; hollow or solid output; IP65	Indexing, automation, heavy conveyor — shock overload to 500% of rated torque
Planetary Gearbox — Precision (backlash <3 arc-min)	DIN 3960; backlash <3 arc-min; efficiency ≥97%	3:1–100:1; 20–5,000 Nm	IEC or servo flange input; B5/B14 output; IP65	Servo, CNC, and robotics drives requiring precision and repeatability
Inline Helical Reducer — Coaxial B5/B14	AGMA 2001; IEC B5/B14 input flange	2:1–50:1; 20–5,000 Nm	B5/B14 IEC coaxial; solid or hollow output; IP65	In-line coaxial speed reduction — pumps, fans, compressors — KSA utilities
Gearbox — Synthetic Oil PAG ISO VG 220	ISO 6743-6 CKS; DIN 51517 Part 3	ISO VG 220; −30°C to +120°C; VI >200	1L, 5L, 20L, 200L containers	Factory-fill and service oil for worm and helical gearboxes in KSA high-ambient plants
Gearbox Output Shaft Seal — FKM (Viton)	DIN 3760 / ISO 6194; FKM lip seal	Shaft dia. 20–200mm; −20°C to +200°C	Single-lip and double-lip with garter spring	Oil seal replacement for gearboxes operating in hot and dusty KSA environments
Torque Arm Assembly — Shaft-Mounted Gearbox	Manufacturer standard; rubber-bushed pivot	Up to 50,000 Nm reaction force	Adjustable length; rubber isolating bushing; bolt-on gearbox flange	Reaction load absorption for shaft-mounted gearboxes on conveyors and mixers
Shrink Disc Locking Assembly	DIN 6885; interference locking; SS 304 or carbon steel	Shaft dia. 20–200mm; torque to 100,000 Nm	Split outer ring; clamping bolts; keyless drive	Hollow bore gearbox shaft locking — no keyway stress concentration on driven shaft
Motor Adapter Flange — IEC B5/B14 to Gearbox	IEC 60072-1; toleranced to h6 bore and h7 pilot	IEC 56–280 frame compatibility	Aluminium or cast iron; DIN 42948 flange pattern	IEC motor-to-gearbox adaptation for non-standard frame combinations in KSA
Jaw Coupling Spider Element — PU (Shore 92A)	DIN 740-2; oil-resistant; −30°C to +90°C	Sizes 19–90 (GR/T/H/TB series); standard and fail-safe profiles	Moulded PU; 6- and 8-jaw profiles	Spider element replacement for jaw couplings on pump and fan drives — KSA plants
Grid Coupling Element Kit (Spring Grid)	AGMA 9002; hardened spring steel	Falk T10–T130 equivalent sizes	Split horizontal grid; greased assembly	Spare grid element for preventive maintenance on conveyor and crusher drives
Gearbox Breather Vent — Oil Mist Separator	IP65 vent; 0.1 bar pressure differential	BSP 1/4" to 1"; sintered bronze element	Oil mist separator; drain port; SS 316L fitting	Gearbox pressure relief and oil contamination prevention in KSA dusty environments
Keyway Bushing — Taper-Lock (Bush)	DIN 6885 / ISO 286; cast iron taper	1008–5050 series; bore 10–125mm	1 or 2 keyways; extraction bolt holes	Coupling hub and sprocket shaft mounting for easy removal and replacement in KSA
Gearbox Dipstick / Level Plug — SS 316L	Manufacturer standard; BSPP thread	1/2" BSPP or 3/4" BSPP; magnetic drain plug option	SS 316L or brass; oil-level sight glass option	Oil-level inspection and drain plug replacement for in-service gearboxes — KSA
Cooling Fan Kit — Gearbox External Fan	Manufacturer standard; IP55 motor; 50 Hz / 60 Hz	63W–250W fan motor; airflow 100–1,000 m³/h	Bolt-on gearbox housing; 230V or 400V AC	Thermal rating uplift for high duty-cycle gearboxes in Saudi Arabia's 50°C+ ambient

Gearboxes & Shaft Couplings Supplier Saudi Arabia — Helical Gearboxes, Worm Drives & Jaw Couplings In Stock

Product Types in Stock

Helical & Parallel Shaft Gearboxes

Helical-Bevel Gearboxes

Worm Gearboxes

Shaft Couplings — Flexible Jaw, Grid & Disc

Speed Reducers & In-Line Drives

Gearbox Accessories & Spares

Complete Gearboxes & Couplings Range — 30+ Products

Why Mechanical Engineers in Saudi Arabia Choose Gulf Union Ozone for Gearboxes & Couplings

Local Stock — Same-Day Dispatch

Technical Data & Documentation

ISO 9001:2015 Certified Quality

Nationwide KSA Delivery

Also Stocked at Gulf Union Ozone

Bearings & Linear Motion

Industrial Belts & Chains

Lubricants & Greases

Industrial Fans & Blowers

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