Don't throw away your expensive office chair with a bad gas lift/cylinder, replace it with Gromax Brand NEW Gas lift!!
Brand New Gas Lift, Model Number:305D Gas Lift base with top: 28mm and bottom 44mm then tapered from 47mm to 50.8mm (2 inches). Has a 7" up and down stroke. Total extended length is: 21.5". The black base is 12" long. Made in Taiwan. Meets DIN 4550, ANSI/BIFMA X5.1 standards.
Gromax Office Chair Gas Lift
Unit: inch
| Model NO | Stoke (SL) | Extended Length (EL) | A | B | C | Dia. | Supporting Weight (lb) |
| 165D | 2.75 | 12.5 | 7 | 2.5 | 2 | 2 | 260 |
| 165D.HD | 2.75 | 12.5 | 7 | 2.5 | 2 | 2 | 350 |
| 165S | 3 | 12.5 | 6.5 | 3 | n/a | 2 | 260 |
| 165S.HD | 3 | 12.5 | 6.5 | 3 | n/a | 2 | 350 |
| 185S | 3 | 14 | 7.25 | 3.5 | n/a | 2 | 260 |
| 185S.HD | 3 | 14 | 7.25 | 3.5 | n/a | 2 | 350 |
| 210S | 3.75 | 15.5 | 8.5 | 2.5 | n/a | 2 | 260 |
| 210S.HD | 3.75 | 15.5 | 8.5 | 2.5 | n/a | 2 | 350 |
| 210D.HD | 3.75 |
15.5 | 8.375 |
2.5 | 0.5 | 2 | 350 |
| 230S | 4.75 | 16.5 | 9.25 | 2.5 | n/a | 2 | 260 |
| 230S.HD | 4.75 | 16.5 | 9.25 | 2.5 | n/a | 2 | 350 |
| 230D | 4.75 | 16.25 | 9 | 2.5 | 0.5 | 2 | 260 |
| 230D.HD | 4.75 | 16.25 | 9 | 2.5 | 0.5 | 2 | 350 |
| 285D | 7.25 | 21 | 11.25 | 2.5 | 1.5 | 2 | 260 |
| 285D.HD | 7.25 | 21 | 11.25 | 2.5 | 1.5 | 2 | 350 |
| 305D | 7 | 21.5 | 12 | 3 | 0.5 | 2 | 260 |
| 305D.HD | 7 | 21.5 | 12 | 3 | 0.5 | 2 | 350 |
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