NX30 bearing: complete specifications & equivalents

The NX30 is a DIN 616 radial bearing sized 30 x 42 x 30 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.

Principal dimensions: bore d 30 mm, outer diameter D 42 mm, width B 30 mm. Schematic, not to scale.

Specification table

Parameter	Value
Brand	SKF
Bore diameter d	30 mm
Outer diameter D	42 mm
Width B	30 mm
Material	GCr15
Seal / shield	open
Internal clearance	CN
Tolerance class	P0
Cage	none
Basic dynamic load rating C	22.9 kN
Basic static load rating C0	38 kN
Fatigue load limit Pu	4.8 kN
Reference speed (thermal)	5300 rpm
Limiting speed (mechanical)	6000 rpm
Operating temperature	-40 to +120 °C
Mass	130 g
Manufacturer designation	NX 30
Standard	DIN 616
Catalog version	SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.8 needle roller / thrust ball, full complement thrust part
Last verified	2026-09-26

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.8 needle roller / thrust ball, full complement thrust part) · extracted 2026-09-26

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.8 needle roller / thrust ball, full complement thrust part); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Dimensions in inches & NX-series range

Bore d	1.181 in
Outer diameter D	1.654 in
Width B	1.181 in
ISO bore code	—
Radial section height (D−d)/2	6 mm
Smallest bore in NX-series	7 mm
Largest outer diameter in NX-series	47 mm
Width range across NX-series	18–30 mm
Bore position in NX-series (smallest first)	8 of 9
Bore above smallest NX-series size	23 mm

Cross references & equivalents

Equivalent model	Brand	Match level	Note
NX30-Z	SKF	full Dimensions and internal design equivalent — standard interchange.	Same 30×42×30 mm envelope and equivalent catalogue ratings; NX30-Z is the combined needle/thrust ball execution — boundary-dimension interchangeable, execution differences (seals, shields, cage) apply.
RNA6905	SKF	partial Main dimensions match; tolerances, seals or internal clearance differ.	Same 30×42×30 mm envelope, but catalogue C/C0 differ between the executions (22.9/38 vs 38/62 kN) — boundary dimensions match, not a load-rating equivalent.
NKX30-Z	SKF	full Dimensions and internal design equivalent — standard interchange.	Envelope-identical (30×42×30 mm) combined needle/thrust ball execution with ratings within 10 % — substitution possible after checking ring/flange construction.
NKX30	SKF	full Dimensions and internal design equivalent — standard interchange.	Envelope-identical (30×42×30 mm) combined needle/thrust ball execution with ratings within 10 % — substitution possible after checking ring/flange construction.
NKXR30	SKF	full Dimensions and internal design equivalent — standard interchange.	Envelope-identical (30×42×30 mm) combined needle/thrust needle execution with ratings within 10 % — substitution possible after checking ring/flange construction.
NKXR30-Z	SKF	full Dimensions and internal design equivalent — standard interchange.	Envelope-identical (30×42×30 mm) combined needle/thrust needle execution with ratings within 10 % — substitution possible after checking ring/flange construction.

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the NX30 model number is decoded

Where a 30 mm shaft needs radial support plus one-direction axial location in minimal length, NX 30 from the combined needle roller / full complement thrust ball bearings stacks both functions: 42 mm OD, thrust part 12.7 kN (Ca) dynamic. Reading the designation: NX marks needle roller + full complement thrust ball, the number the 30 mm shaft seat; 42 mm OD and 30 mm overall height follow the series plan. The thrust washer set is keyed to the housing, the ball complement to the shaft washer — assembly orientation matters, since reverse axial shocks would unload the packed ball set. Selection arithmetic for the combined unit: radial C 22.9 kN, radial C0 38 kN, axial dynamic 12.7 kN (Ca) and axial static 32.5 kN (C0a); combine them with the equivalent-load factors from the catalogue before checking L10. The full complement thrust set has no cage to retain the balls — hold them with grease during assembly and never rotate the shaft before the axial preload (at least factor A 0.0055) is applied.

Typical equipment & failure modes

Common applications

screw jack and lifting screw spindles
valve and dosing pump stems with slow axial push
light rotary tables under axial load
oscillating pivots with steady axial preload

Known failure patterns

needle edge loading and raceway denting when the shaft deflects beyond the compensation range
polymer cage deformation when the local temperature exceeds the 120 °C sustained limit
grease starvation at the roller ends when relubrication intervals are stretched in dirty duty
brinelling of raceways from impact or pressing force transmitted through the rolling elements
thrust washer raceway wear from reverse axial shocks the one-direction thrust part cannot carry

Selection pitfalls — read before you substitute

At 30 mm bore, verify shaft deflection against the needle length: these rollers tolerate little edge loading, and a simply supported span between 30 mm seats can bend past the compensation range long before the load rating is exhausted.
The quoted 22.9/38 kN ratings are SKF catalogue values for this exact execution (NX 30); ratings can be revised without the order number changing, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the drawing.
Oscillating pivots fail differently: rocking through a small angle concentrates wear in the same roller positions — inspect those zones, and consider rotating the assembly's clock position at service intervals.
Height stack-up is easy to mis-check: the thrust-washer part adds height beyond a plain needle bearing, and clamping the stack solid over it preloads the thrust set beyond its rating.
Do not treat the axial rating 12.7 kN (Ca) as independent of radial load: the combined equivalent load formulas couple them, and a unit sized on radial life alone will spall the ball raceway first under real thrust.
The 22.9/38 kN ratings and 130 g mass are SKF catalogue values transcribed from ch. 7.8 of PUB BU/P1 17000 (PDF table page 656); combined-type axial ratings appear in the text above because the structured record carries radial values only.

Frequently asked questions

Is the NX 30 sealed?

No — this execution is open and depends on the housing sealing arrangement; grease it at assembly and keep the relubrication interval short in dirty duty.

Which dimensions does the NX 30 have?

A NX 30 measures 30 mm bore/Fw × 42 mm outside diameter × 30 mm width (1.181 × 1.654 × 1.181 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 22.9 kN, static C0 38 kN, fatigue limit Pu 4.8 kN, limiting speed 6,000 r/min, reference speed 5,300 r/min, mass about 130 g. Axial ratings of the thrust part: dynamic Ca 12.7 kN (Ca), static C0a 32.5 kN (C0a), minimum load factor A 0.0055; the thrust set carries load in one direction only.

What does NX 30 mean in SKF part numbering?

NX = needle roller radial part + full complement thrust ball part for a 30 mm shaft; the catalogue plan completes 42 mm OD and 30 mm overall height. The packed thrust set maximises axial capacity at low speed.

Does the NX 30 need a hardened and ground shaft?

The radial needle part of the NX 30 runs directly on the 30 mm journal — harden to 58–64 HRC and grind it. The thrust washers are integral, so no separate inner ring exists; size the shaft for the raceway tolerances in the catalogue table.

Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.8 needle roller / thrust ball, full complement thrust part on 2026-09-26. Read our editorial & correction policy.