INASL18-5013-ADouble Row Full Complement Cylindrical Roller Bearing 65x100x46 mm Semi-Locating 1.5 mm Axial Float

Product Description

What this part is

This is a double row, full complement cylindrical roller bearing measuring 65 mm bore by 100 mm outside diameter by 46 mm wide. It belongs to Schaeffler’s SL18 family: two rows of cylindrical rollers running directly on the raceways with no cage, in a semi-locating rib arrangement. It is supplied open, with no seals or shields, and has a lubrication hole through the outer ring so the bearing can be fed grease or oil through the housing. Radial internal clearance is the standard CN group and dimensional tolerance is class PN.

Decoding the designation

SL18 identifies a double row, full complement cylindrical roller bearing of the semi-locating type, with one rib on the outer ring and three ribs on the inner ring. The fourth and fifth digits give the ISO dimension series: SL185013 is dimension series 50. The final two digits are the bore code, 13, which corresponds to a 65 mm bore. The trailing -A is an internal design variant. You will also see -XL for the optimised current generation and -C3 for increased radial internal clearance.

It is worth knowing the neighbouring families, because they share envelopes but not function. SL01 is the fully locating design, with both rings ribbed on both sides, which fixes shaft position and takes axial load in both directions. SL04 is a double row full complement locating design built with a two-part inner ring plus snap rings, corresponding to the DIN NNCF and NNF types; it offers higher axial capacity and is available in sealed -2NR forms. SL18, the family this bearing belongs to, sits between the fully free and fully fixed options.

Why the 1.5 mm axial displacement figure matters

The published permissible axial displacement for this bearing is s = 1.5 mm. That single number is the reason SL18 exists. A shaft grows as it warms up. If both ends are axially fixed, that growth has nowhere to go and turns into axial preload that the roller ends were never rated to carry, which shows up as rapid heat rise and short life. The classic answer is to make one end fully free with an NU or NNU bearing, but a fully free bearing gives no axial guidance at all, so the shaft can wander and the seals and couplings have to tolerate it.

SL18’s one-rib outer, three-rib inner arrangement is the middle ground. The roller set can shift up to 1.5 mm relative to the outer ring, absorbing thermal growth without transmitting axial force, while still constraining the shaft within that window. That makes SL18 suitable at the non-locating end of a shaft while retaining some axial control, rather than choosing between a fully floating bearing and a preloaded set.

Why full complement, and what it costs

With no cage taking up circumferential space, the bearing fits the maximum possible number of rollers into its envelope. More rollers under load means substantially higher radial capacity and higher radial rigidity than any caged bearing of the same outside dimensions. That is the point of specifying full complement: when the shaft diameter and housing bore are fixed by the rest of the design and more capacity is needed, this is where the capacity comes from.

The trade-off is speed and light-load behaviour. Adjacent rollers rub against each other rather than being separated by a cage, so friction and heat generation are higher and the speed ceiling is lower than a caged equivalent. Published limiting speed here is 4,000 rpm with a thermal reference speed of 2,500 rpm. A full complement bearing is also unsuited to high speed under light load: without enough radial load to keep the rollers rolling, they skid, break down the lubricant film and scuff the raceways. Duty cycles with long high-speed, light-load periods favour a caged NN or NNU design.

Published ratings and mounting data

Bore diameter d: 65 mm.

Outside diameter D: 100 mm.

Width B: 46 mm.

Number of rows: 2.

Roller set: full complement, no cage.

Function: semi-locating, 1 rib on outer ring, 3 ribs on inner ring.

Permissible axial displacement s: 1.5 mm.

Dynamic radial load rating Cr: 223 kN.

Static radial load rating C0r: 315 kN.

Fatigue limit load Cur: 53 kN.

Limiting speed nG: 4,000 rpm.

Reference speed: 2,500 rpm.

Radial internal clearance: CN.

Dimensional tolerance class: PN.

Closure: open, no seals or shields.

Lubrication: lubrication hole present, dimension C = 23 mm.

Mass: 1.32 kg.

What these specs mean in practice

A dynamic rating of 223 kN in a 65 mm bore, 46 mm wide package is a lot of capacity for the size, and that is the reason to accept the speed limitation. The static rating of 315 kN governs whether a momentary overload or a standing load permanently indents the raceways, which matters for machines that jam, take shock, or sit loaded when stopped. The fatigue limit load Cur of 53 kN is the more useful figure for infinite-life work: an equivalent dynamic load below it, with clean lubricant and an adequate film, keeps the bearing below its fatigue threshold rather than accumulating damage. CN clearance assumes a normal interference fit and a normal temperature difference between the rings; heavier press fits or a hot inner ring consume running clearance, which is when the -C3 variant is the correct choice.

Quantity and configuration

One bearing per unit, supplied open. Two rows of rollers, full complement, semi-locating rib arrangement.

Interchange guidance

INA is a Schaeffler Group brand alongside FAG, so current technical data is published under Schaeffler. Search forms that reach the same part include SL185013-A, SL185013A, SL18-5013-A, SL18 5013 A and SL185013A-XL. An SL01 or SL04 bearing of the same bore and outside diameter has a different rib arrangement — those are locating designs and fix the shaft axially, which removes the reason for choosing SL18.