Half Gear Coupling Manufacturer in India
A half gear coupling pairs one crowned-tooth gear hub in a flanged sleeve with a rigid flanged hub bolted to that sleeve, so it takes angular misalignment at the gear end only, not parallel offset. Super Mech Industries makes half gear couplings in Ahmedabad in the FG-100 to FG-119 series, rated 559 to 1,666,744 Nm.
The Half Gear Half Rigid Coupling offered by Super Mach Industries is a high-quality industrial coupling designed to provide both flexibility and rigidity in power transmission systems. One side of the coupling features a gear hub to accommodate misalignment and absorb shock loads, while the rigid side ensures a strong and secure shaft connection.
Key Features
- Combination of gear flexibility and rigid connection
- High torque transmission capability
- Absorbs shock and vibration on gear side
- Strong and durable construction
- Easy installation and maintenance
Detailed Description
A half gear coupling has two different hubs. One is a gear hub with crowned external teeth, meshing inside a flanged sleeve with internal teeth. The other is a rigid hub with an integral flange and no teeth, which bolts to the sleeve flange. Each hub is bored for its own shaft — D1 on the gear hub and D2 on the rigid hub on the SMI spec sheet.
The gear mesh lets the gear end tilt: SMI rates it at up to 1.5° of angular misalignment. The rigid end cannot move, and one gear mesh on its own cannot take parallel offset — offset needs two flexing points some distance apart. That is why the half gear coupling is chosen where the second flexible element is somewhere else in the drive, most often a floating shaft with a half gear coupling at each end.
Where both shaft ends need to accommodate misalignment, use a full gear coupling instead. See our flexible gear coupling manufacturer page for a full comparison.
- Larger bore on the rigid hub. On the SMI spec sheet the rigid hub's maximum bore D2 is larger than the gear hub's D1 in every size where it is listed — 45 mm against 35 mm at FG-100, and 260 mm against 220 mm at FG-110.
- Custom flange drilling. SMI can drill the flange to a non-standard pitch circle diameter, bolt count and bolt-hole size against your drawing.
Technical Specifications
- Gear end: One crowned-tooth gear hub in a flanged sleeve — angular misalignment up to 1.5°
- Rigid end: Flanged hub with no teeth, bolted to the sleeve flange — does not flex
- Parallel offset: Not on its own — needs a second flexible element, e.g. a floating shaft
- Sizes: FG-100 to FG-119 (20 sizes, same series as the full gear coupling)
- Rated torque: 559 to 1,666,744 Nm (57 to 169,961 Kg.M)
- Max bore, gear hub (D1): 35 mm (FG-100) to 710 mm (FG-119)
- Max bore, rigid hub (D2): 45 mm (FG-100) to 260 mm (FG-110); not printed from FG-111
- Max speed: 7,600 rpm (FG-100) to 500 rpm (FG-119)
Common Applications
- Floating-shaft drives (a half gear coupling at each end)
- Gearboxes with one rigidly located side
- Pumps and compressors aligned for offset
- Material handling and industrial machinery
Size chart, ratings and dimensions
Every size SMI manufactures, with its rated torque, speed limit, bore range and mounting dimensions as published on the spec sheet. Bores are finished to your shaft within the listed maximum; ask for the dimension drawing if a letter is unclear.
FG series full & half gear couplings — ratings and dimensions
Sizes FG-100 to FG-119. Power is at 100 rpm; rated torque in Nm; dimensions in mm; weight of solid-hub coupling in kg; WR² in kg·m².
| Size | kW at 100 rpm | Rated torqueNm | Max speedrpm | Pilot bore PBmm | Max bore D1mm | Max bore D2mm | ØAmm | Cmm | C1mm | ØBmm | ØB1mm | ØFmm | Mmm | Gmm | Jmm | Lmm | Weightkg | WR²kg·m² |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| FG-100 | 5.9 | 559 | 7600 | 13 | 35 | 45 | 120 | 45 | 45 | 50 | 65 | 75 | 54 | 3 | 39 | 93 | 5 | 0.01 |
| FG-101 | 11.8 | 1127 | 6300 | 21 | 50 | 60 | 170 | 55 | 55 | 65 | 85 | 110 | 67 | 5 | 49 | 115 | 11 | 0.04 |
| FG-102 | 29.4 | 2804 | 5000 | 30 | 60 | 75 | 185 | 70 | 70 | 85 | 110 | 125 | 83 | 5 | 62 | 145 | 15 | 0.05 |
| FG-103 | 52.9 | 5047 | 4000 | 40 | 75 | 90 | 220 | 85 | 85 | 105 | 130 | 150 | 103 | 5 | 78 | 175 | 26 | 0.12 |
| FG-104 | 100 | 9557 | 3350 | 50 | 90 | 110 | 250 | 105 | 105 | 130 | 160 | 175 | 124 | 5 | 96 | 215 | 40 | 0.24 |
| FG-105 | 153 | 14605 | 2800 | 60 | 110 | 130 | 290 | 110 | 110 | 155 | 185 | 200 | 136 | 10 | 106 | 230 | 63 | 0.49 |
| FG-106 | 235 | 22444 | 2500 | 75 | 125 | 150 | 320 | 125 | 125 | 175 | 215 | 230 | 152 | 10 | 117 | 260 | 85 | 0.75 |
| FG-107 | 412 | 39303 | 2100 | 90 | 140 | 170 | 350 | 140 | 140 | 205 | 240 | 260 | 174 | 10 | 134 | 290 | 110 | 1.31 |
| FG-108 | 529 | 50472 | 1900 | 105 | 160 | 200 | 380 | 155 | 155 | 230 | 285 | 290 | 187 | 10 | 147 | 320 | 160 | 2.13 |
| FG-109 | 658 | 62821 | 1700 | 125 | 180 | 220 | 430 | 165 | 165 | 250 | 315 | 330 | 196 | 10 | 156 | 340 | 210 | 3.75 |
| FG-110 | 963 | 91923 | 1400 | 140 | 220 | 260 | 490 | 180 | 180 | 310 | 370 | 390 | 216 | 10 | 171 | 370 | 277 | 7.63 |
| FG-111 | 1289 | 123065 | 1250 | 160 | 260 | — | 545 | 200 | — | 350 | — | 445 | 245 | 10 | 191 | 410 | 550 | 14.5 |
| FG-112 | 1723 | 164516 | 1120 | 180 | 300 | — | 590 | 240 | — | 400 | — | 490 | 289 | 10 | 230 | 490 | 710 | 22 |
| FG-113 | 2344 | 223793 | 1000 | 200 | 330 | — | 680 | 260 | — | 440 | — | 555 | 312 | 15 | 241 | 535 | 980 | 34.5 |
| FG-114 | 3351 | 320012 | 900 | 220 | 370 | — | 730 | 280 | — | 500 | — | 610 | 341 | 15 | 265 | 575 | 1320 | 72.75 |
| FG-115 | 4071 | 388738 | 800 | 250 | 410 | — | 780 | 320 | — | 540 | — | 660 | 385 | 15 | 303 | 655 | 1700 | 88.25 |
| FG-116 | 7028 | 671165 | 710 | 300 | 455 | — | 900 | 350 | — | 625 | — | 755 | 423 | 20 | 333 | 720 | 2550 | 172 |
| FG-117 | 9997 | 954665 | 630 | 375 | 520 | — | 1000 | 400 | — | 720 | — | 855 | 489 | 20 | 384 | 820 | 3620 | 309 |
| FG-118 | 13236 | 1263938 | 560 | 450 | 610 | — | 1100 | 450 | — | 810 | — | 950 | 533 | 20 | 428 | 920 | 4860 | 491 |
| FG-119 | 17453 | 1666744 | 500 | 520 | 710 | — | 1250 | 485 | — | 910 | — | 1050 | 559 | 30 | 444 | 1000 | 6380 | 753 |
- Dimension letters (ØA, C, C1, ØB, ØB1, ØF, M, G, J, L) refer to the drawing on the SMI spec sheet.
- From FG-111 onwards the coupling uses the cover-plate construction shown as Detail X on the spec sheet; D2, C1 and ØB1 do not apply.
- FG-119: catalogue prints 174554 kW at 100 rpm; from the rated torque (T × n ÷ 9550) it is 17,453 kW, which is what is shown.
Source: SMI spec sheet half-gear-coupling.pdf
Get a price for a half gear coupling
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Frequently Asked Questions
What is a half gear coupling?
A half gear coupling has one gear hub with crowned external teeth meshing inside a flanged sleeve, and one rigid flanged hub, with no teeth, that bolts to the sleeve flange. Each hub is bored for its own shaft. The gear end takes angular misalignment; the rigid end does not flex, so the coupling cannot take parallel offset on its own.
When should I use a half gear coupling instead of a full gear coupling?
Use a half gear coupling where the second flexible element is elsewhere in the drive, typically a floating-shaft arrangement: a half gear coupling at each end of the floating shaft gives two gear meshes that together take parallel offset. It also suits a connection where one end is already rigidly located. It is not a cheaper substitute for a full gear coupling on an ordinary motor-to-machine drive.
What sizes and bores do SMI half gear couplings come in?
SMI makes half gear couplings on the FG-100 to FG-119 series, rated 559 Nm to 1,666,744 Nm, with a maximum speed of 7,600 rpm at FG-100 falling to 500 rpm at FG-119. The spec sheet gives two maximum bores: D1 for the gear hub, 35 mm at FG-100 to 710 mm at FG-119, and D2 for the rigid hub, 45 mm at FG-100 to 260 mm at FG-110. The rigid-hub dimensions (D2, C1, ØB1) are printed up to FG-110 only; for FG-111 and larger, ask SMI for the rigid-hub drawing.
How much misalignment can a half gear coupling take?
Angular misalignment at the gear end only: SMI rates the gear mesh at up to 1.5°. The rigid flanged end takes none, and a single gear mesh cannot take parallel offset, so the shafts must be aligned for offset or a second flexible element used, as in a floating-shaft drive.
Where are half gear couplings used?
SMI supplies half gear couplings for gearboxes, pumps and compressors, material-handling equipment and general industrial machinery, in particular floating-shaft drives and flanged connections where one end is already rigidly located.
Can SMI machine custom bores and flanges on a half gear coupling?
Yes. SMI finishes the gear-hub bore within D1 and the rigid-hub bore within D2 for the size, with keyways to your shafts, typically in 3–5 working days at its Odhav, Ahmedabad factory. Non-standard flange drilling (pitch circle diameter, bolt count and bolt-hole size) is quoted against your drawing.
Is Super Mech Industries ISO certified?
Yes. Super Mech Industries is ISO 9001:2015 certified (certificate no. 09114716A) and ZED certified. It makes its half gear couplings at Odhav, Ahmedabad, Gujarat, and exports to 29 countries.
Need a custom size or bore specification?
Our engineers will match the right coupling to your drawing — any bore size, material, or design.
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Super Mech Industries exports from Ahmedabad, India to 29 countries, shipping from Mundra Port (Gujarat) or JNPT (Nhava Sheva, Mumbai).
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Super Mech Industries — Odhav, Ahmedabad, Gujarat 382415, India. Phone: +91 63510 70577. Email: smigvs@gmail.com. ISO 9001:2015 certified.