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U-Type Bearing
| Cylinder (Ø mm) |
A | B | C | Ch | D | E | F | G | H | ØI | L1 | L2 | L3 | L4 | L5 | L6 | N | O | P | Q | R | T | U | V | VI | Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 32 | 97 | 49 | 51 | 15 | 24 | 4.3 | 93 | 45 | 12 | 12 | 3 | 19 | 75 | 125 | 187 | 47 | 6.6 | 12 | 11 | 6.5 | M6 | 78 | 61 | 32.5 | 60.7 | 74 |
| 40 | 115 | 58 | 58.2 | 15 | 28 | 11 | 112 | 55 | 12 | 16 | 3 | 24 | 80 | 140 | 207 | 52 | 6.6 | 12 | 11 | 6.5 | M6 | 84 | 69 | 38 | 64 | 87 |
| 50 | 137 | 70 | 70.2 | 20 | 34 | 18.8 | 134 | 65 | 15 | 20 | 3 | 27 | 78 | 148 | 223 | 57 | 9 | 16 | 15 | 8.5 | M8 | 100 | 85 | 46.5 | 70 | 104 |
| 63 | 152 | 85 | 85.2 | 20 | 34 | 15.3 | 147 | 80 | 15 | 20 | 3 | 27 | 106 | 178 | 243 | 47 | 9 | 16 | 15 | 9 | M8 | 105 | 100 | 56.5 | 74.7 | 119 |
| 80 | 189 | 105 | 105.5 | 26 | 50 | 25 | 180 | 100 | 20 | 25 | 3 | 27 | 111 | 195 | 267 | 49 | 11 | 20 | 18 | 11 | M10 | 130 | 130 | 72 | 82 | 148 |
| 100 | 213 | 130 | 130.5 | 26 | 55 | 30 | 206 | 120 | 20 | 25 | 3 | 27 | 128 | 218 | 290 | 49 | 11 | 20 | 18 | 11 | M10 | 150 | 150 | 89 | 83 | 173 |
What Is a U-Type Bearing?
A U-type bearing carries the trunnion pin in a U-shaped body and bolts to the machine from its base. It suits horizontal mounting surfaces where the cylinder is supported from below.
Selection depends on the trunnion pin diameter, the base hole pattern and the swing angle.
| Role | Carries the trunnion pin from below |
| When | Horizontal mounting surface |
| Selection | Pin diameter, hole pattern, swing angle |
See all custom cylinders and connection equipment, or contact us for a quotation.
Frequently Asked Questions
Which cylinders use U-type bearings?
Pneumatic trunnion cylinders.
When choose U-type over H-type?
When the mounting surface is horizontal and the cylinder is supported from below.
How is the size chosen?
By the trunnion pin diameter, which follows the cylinder bore.
Installing a U-Type Bearing
The U-type bearing bolts to a horizontal surface through its base and carries the trunnion from below. Both bases must sit in the same plane — use shims to correct height differences — and the cylinder is swung by hand to confirm free movement before the bolts are tightened.
Base mounting makes installation easy where the cylinder sits on a table or platform. In dusty environments keep the bearing surfaces clean and greased so the swing stays smooth.
U-Type Bearing Installation Checklist
| Check | Why it matters | How |
|---|---|---|
| Base flatness | If both bearings are not in one plane the trunnions bind | Straight edge or spirit level |
| Height | Cylinder axis must line up with the load | Shims if needed |
| Parallelism | Trunnion axis square to the plane of motion | Try square |
| Lubrication | A dry trunnion wears fast and squeaks | Periodic grease |
| Play | Knocks when the motion reverses | Shake by hand |
