SKFNN 3017 KTN9/SPSuper-Precision Double-Row Cylindrical Roller Bearing 85x130x34 mm, Tapered 1:12 Bore, Polyamide Cage, SP Precision Class

Product Description

Part identity

SKF NN 3017 KTN9/SP super-precision double-row cylindrical roller bearing. Brand: SKF. Designation: NN 3017 KTN9/SP. Base number: NN3017. Series: NN 30. Bore code: 17. Bore form: tapered, 1:12 taper. Precision class: SP, SKF super-precision. Closure: open. Number of rows: 2. Rolling elements: cylindrical rollers, two rows. Radial internal clearance: C1. Harmonization code: 8482.50.00.

Dimensions and tolerances

Bore d: 85 mm, tapered 1:12. Outside diameter D: 130 mm. Width B: 34 mm. Bore tolerance: 0 to +0.020 mm. Outside diameter tolerance: −0.011 mm to 0. Width tolerance: −0.20 mm to 0. Chamfer, inner ring r3,4 min: 0.6 mm. Chamfer, outer ring r1,2 min: 1.1 mm. Permissible axial displacement, maximum: 2 mm. Design units: metric. Mass: 1.55 kg (3.42 lb).

Materials

Rings and rollers: chrome through-hardened bearing steel. Cage type: injection-moulded one-piece window-type cage, SKF TN9 execution. Cage material: glass-fibre-reinforced polyamide 6,6. Maximum operating temperature for the polyamide cage: 120 °C.

Designation breakdown

NN 30 is a double-row cylindrical roller bearing in the NN 30 dimension series. 17 is the bore code, 17 × 5 = 85 mm. K is the tapered bore at a 1:12 taper. TN9 is the injection-moulded glass-fibre-reinforced polyamide 6,6 cage — the letters name a cage material and a moulding method, not a precision grade. SP is SKF’s super-precision tolerance class, covering dimensional accuracy to ISO class 5 and running accuracy to ISO class 4. SP is a precision class, and the reason this bearing is a distinct product from an ordinary NN 3017.

Function in a spindle

Two rows of cylindrical rollers run between a two-flange outer ring and a ribbed inner ring, which gives very high radial load capacity and very high radial rigidity in a short axial section. The bearing carries radial load only and accommodates no misalignment. It is the radial member of a machine-tool spindle arrangement, and the axial location is taken by separate super-precision angular contact bearings or a double-direction thrust bearing.

Tapered bore and clearance setting

Driving the inner ring up the 1:12 taper expands the ring and reduces radial internal clearance, so clearance in this bearing is set at mounting rather than fixed by the fit. A small negative clearance produces maximum radial rigidity and minimum runout; a small positive clearance leaves room for thermal growth. The bearing seats on a spindle machined with a matching 1:12 taper at 85 mm, or on an adapter sleeve whose tapered outside diameter measures 85 mm to match the bore seat. This listing covers the bearing itself.

Lubrication feature

This designation is the plain SP execution. The related NN 3017 KTN9/SPW33 designation adds an annular lubrication groove and three radial holes in the outer ring.

Applications

Machine-tool spindles in milling, turning, grinding and boring machines; precision gearboxes; high-rigidity indexing tables; and test rigs.

Interchange

Close SKF relatives: NN 3017 KTN9/SPW33 (adds the outer-ring lubrication groove and holes), NN 3017 TN9/SP (cylindrical bore, mounted on a straight seat), NN 3017 KTN9/VQ554 and NN 3017 KTN9/VS019 (special-clearance variants). Same-envelope designations elsewhere: FAG NN3017-AS-K-M-SP, NSK NN3017MBKRCC1P4 and NN3017TBKR, NTN NN3017K. Listing search forms: NN3017KTN9/SP, NN-3017-K-TN9-SP, NN3017KSP, NN3017K, NN3017. Precision class as well as base number governs selection between them.