NACHI 29417EX Spherical Roller Thrust Bearing 85x180x58 mm
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The NACHI 29417EX is a spherical roller thrust bearing in the 294 series (EX, high-capacity design). It measures 85 x 180 x 58 mm (bore x outer diameter x height) and carries a basic dynamic axial load rating of 640,000 N and a basic static axial load rating of 1,810,000 N. Limiting speed is 1,300 rpm on grease and 2,000 rpm on oil. The mass is 6.69 kg.
The housing-washer raceway is spherical, so the bearing is self-aligning. With a contact angle of about 45° it carries axial load together with a small to moderate radial load, and it takes high loads at low to moderate speeds.
Where this product is used
- Crane hooks and lifting gear
- Injection moulding machines
- Large machines with heavy axial load
- Vertical shaft drives and large gearboxes
- Heavy axial load positions at low to moderate speed
Features
- Spherical housing-washer raceway: the bearing is self-aligning, with permissible misalignment of about 2° under general service conditions
- Contact angle of about 45°, so it carries axial load together with a small to moderate radial load
- High load capacity at low to moderate speeds: Ca 640 kN, Coa 1,810 kN
- Oil lubrication: limiting speed 2,000 rpm on oil (and 1,300 rpm on grease)
- Minimum axial load Coa / 1000 = 1,810 N must always be applied
Key specifications
| Specification | Detail |
|---|---|
| Model | 29417EX |
| Type | Spherical roller thrust bearing (EX, high-capacity design) |
| Series | 294 |
| Bore d | 85 mm |
| Outer diameter D | 180 mm |
| Height T | 58 mm |
| Chamfer r (min) | 2.1 mm |
| Shaft washer diameter d1 | 158.2 mm |
| Housing washer diameter D1 | 120.5 mm |
| Shaft shoulder diameter da (min) | 130 mm |
| Housing shoulder diameter Da (max) | 150 mm |
| Fillet radius ra (max) | 2 mm |
| Basic dynamic axial load rating Ca | 640,000 N |
| Basic static axial load rating Coa | 1,810,000 N |
| Limiting speed, grease | 1,300 rpm |
| Limiting speed, oil | 2,000 rpm |
| Minimum axial load Fa min | 1810 N (Coa / 1000) |
| Contact angle | Approximately 45° |
| Permissible misalignment | About 2° under general service conditions |
| Mass | 6.69 kg |
Selecting the right option
EX is the high-capacity design and has both a grease and an oil limiting speed. Oil lubrication is still the right choice for this bearing type.
Check the loads against Ca and Coa and apply a suitable safety factor. The bearing suits high axial load with some radial load; where radial load is the main load, a radial bearing is the better choice.
Fitting and use
Axial load comes first. The dynamic equivalent axial load is Pa = Fa + 1.2Fr and the static equivalent is Poa = Fa + 2.7Fr, and these apply only while Fr / Fa is 0.55 or less. The static safety factor So must be over 4.
To avoid sliding damage between the rollers and the raceway, the bearing must always carry a minimum axial load Fa min of at least Coa / 1000 (N).
Oil lubrication is advised rather than grease, because of the many sliding surfaces (cage to guide sleeve, roller ends to rib). To get the benefit of the aligning ability (about 2° under general service conditions), leave clearance for the parts around the bearing.
Related products
More from the NACHI spherical roller thrust range: NACHI spherical roller thrust bearings, 60 to 140 mm bore (5 sizes), NACHI 29415EX spherical roller thrust bearing, 75 x 160 x 51 mm and NACHI 29320E spherical roller thrust bearing, 100 x 170 x 42 mm. For radial and combined loads with misalignment, see the NACHI spherical roller bearings (radial type).
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