INAZARF40115LTVACombined Needle Roller & Axial Cylindrical Roller Bearing for Screw Drives – 40 mm ID, 115 mm OD, 93 mm Height, Double Direction, Screw Mounted, PA66 Cage

Product Description

What this part is

INA ZARF40115LTVA needle roller / axial cylindrical roller bearing. ZARF series, double direction, for screw mounting, with a long shaft locating washer. 40 mm bore x 115 mm outside diameter x 93 mm height. This is a combined bearing: a radial needle roller row and two axial cylindrical roller rows in one unit, designed as the fixed-end support for a ball screw or lead screw. Carton designations: ZARF40115LTVA, ZARF-40115-L-TV-A, ZARF 40115 L TV A, ZARF40115-L-TV.

Decoding the designation

Series: ZARF, INA’s axial and radial roller bearing range for screw drives. Cage: TV, plastic cage in PA66 polyamide. Locating feature L: stepped shaft locating washer, extended on one side, which is what makes the overall height 93 mm rather than the 75 mm of the plain ZARF40115-TV. Mounting: screw mounting through the outer ring, 12 holes at 30° spacing on a 94 mm pitch circle for M8 screws.

What these specs mean in practice

The combined design carries the screw thrust and the radial reaction in a single short unit, so one bearing position does the work of a thrust bearing plus a radial bearing. Basic dynamic load rating, axial: 117,000 N. Basic static load rating, axial: 315,000 N. Basic dynamic load rating, radial: 38,000 N. Basic static load rating, radial: 74,000 N. Fatigue load limit, axial: 27,000 N. Fatigue load limit, radial: 10,400 N. Axial rigidity: 3,800 N/µm. Tilting stiffness: 1,800 Nm/mrad. Axial runout: 1 µm. Bearing friction torque: 2.5 Nm. Limiting speed with oil: 3,700 rpm. Limiting speed with grease: 1,200 rpm. Operating range: -30 °C to 120 °C. Weight: 2.761 kg (6.09 lb). Mass moment of inertia: 15.5 kg·cm².

Quantity and configuration

One bearing unit, complete: outer ring, needle roller row, both axial cylindrical roller rows, the wave washer and the long shaft locating washer.

Fitting notes

Screw-mounted to the housing face through 12 M8 holes on a 94 mm pitch circle at 30° spacing. Tightening torque for the axial locknut: 120 Nm, giving an axial preload force of 29,834 N. Maximum housing shoulder diameter: 79 mm. Minimum shaft shoulder diameter: 58 mm. Outer ring width: 22.5 mm. Height of outer ring over the wave washer: 65.5 mm. Shaft washer rib diameter: 78 mm. Wave washer width: 16 mm; long wave washer width: 34 mm; heel width 14 mm; heel diameter 60 mm; outside diameter 78 mm. Lubrication hole diameter: 6 mm, 12.5 mm from the face. Minimum chamfer dimensions: 0.3 mm and 0.6 mm. Housing bore position tolerance: 0.2 mm.

Related parts

INA specifies an AM40 locknut for axial locking and a ZMA40/75 INA precision locknut for radial locking. The matching sealing ring size is 60 x 80 x 8 mm. Screw size: M8, twelve off.

Interchange guidance

ZARF40115-TV is a related size on the same 40 x 115 mm envelope: it uses the short locating washer and stands 75 mm high instead of 93 mm, so the two are not interchangeable in a given housing. The ZARF series is distinct from angular contact thrust types such as the 2344 or the BST family; its axial rows are cylindrical rollers, not balls, which is what gives the very high static axial capacity and the high tilting stiffness.