Types of spline shaft

Depending on the application requirements, either a ground spline shaft or a non-ground (commercial grade) spline shaft is available.

Types of spline shaft Structure Features

Ground spline shaft

bt2

Precision ground and precision machined surface finish
High precision
Possible to machine ends of spline shaft and surface treatment
Nominal diameter: 4-100

Standard

bt2

Standard dimension and shape
High accuracy grade
Short lead time
Nominal diameter: 4-60

Non-ground commercial shaft

bt3

For general industrial use
Cost effective
Possible to machine ends of spline shaft and surface treatment
Nominal diameter: 20-50
Maximum length: 5000 mm

All types are available with ground spline shaft

STANDARD overall heat-treated spline shaft

standard-1

Spline shaft features:

standard-11

Nut features:

Data can be found in Catalogue B 14-23 pages.

STANDARD partly heat-reated spline shaft

standard-2

Spline shaft features:

standard-21

Note: Nominal diameter in part numbers is not equal to real diameter! Real shaft diamaters are in the second column. Example: the real shaft diamater of SSPF25S is 23 mm.

Nut features:

bordástengely anya

alt

Non-ground commercial spline shaft

commercial

Spline shaft features:

commercial-11

Nut features:

The same as at STANDARD type.

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Ball spline (also rotary and stroke type)

The Nippon Bearing ball spline is a linear motion mechanism utilizing the rotational motion of ball elements that can sustain loads and at the same time can transfer torque. It can be used in a wide variety of applications including robotics and transport type equipment.

Types of spline nut

Types Shape Advantage

Cylindrical type

SSP

 ssp

Cylindrical spline nut with key groove
With special key
Nominal diameter: 4-100

SSPS

Anti-corrosion type
Nominal diameter: 4-25

SSPM

 sspm

Cylindrical spline nut without key groove
With two lock plates for fixing
Nominal diameter: 6-10

Flange type

SSPF

 sspf

Spline nut with flange
Nominal diameter: 6-60

SSPFS

Anti-corrosion type
Nominal diameter: 6-25

SSPT

 sspt

Spline nut with a two side cut flange
Nominal diameter: 6-10

Block type

SSPB

 sspb

Cast block
Spline grooves are machined directly on main body
High rigidity
With grease fitting
Nominal diameter: 20-40

Rotary type

SPR

 spr1

Consists of a spline nut and a rotating portion using cross rollers
Nominal diameter: 6-60

Stroke type

SPLFS

 splfs

Extremely small dynamic friction and low noise
High accuracy
Nominal diameter: 6-16

 

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Shafts, shaft support and shaft support rail

The NB's SHAFTS is used with bearings such as a slide bush in order to obtain highly accurate linear motion. When used in combination with a slide bush, the shaft performs as the inner race of the bearing system. The quality and accuracy of the shaft directly affect the performance of the slide bush. NB slide shaft is manufactured with an emphasis on quality and accuracy to ensure stable functionality under many operating conditions. Superior performance is guaranteed for both rotational motion and combined rotation and linear motion.

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Type of shafts

METRIC

SN normal

SNS anti-corrosion

SNT hollow shaft

 shaft01

INCH

SNW normal

SNWS anti-corrosion

 

 snw

 

Features SN and SNB SNS and SNSB SNT
Material SUJ2 Equivalent to SUS440C anti-corrosion SUJ2 hollow shaft
Outer diameter tolerance G6 or to be specified
Hardness 60 HRC or more 56 HRC or more 60HRC or more
Surface roughness less than 0,4 Ra

 

METRIC

SNB normal pre-drilled for fixing shaft support rail

SNSB anti-corrosion pre-drilled for fixing shaft support rail

 snw-pd

INCH

SNW-PD normal pre-drilled for fixing shaft support rail

SNWS-PD anti-corrosion pre-drilled for fixing shaft support rail

 

Shaft support rail

SNB / SNBS for metric shaft

 sa

SNW-PD / SNWS-PD inch shaft

 wa

Low-height shaft support rail

 lwa

A larger diameter shaft can overcome problems in maintaining precision functionality when a high or unbalanced load is applied. A combination of the center-lined tapped shaft together with the SA type support rail is ideal in such cases. The center-lined tapped shaft is standardized to simplify shaft selection.

 

Shaft supporter

Metric Inch
sh-a wh-a
sh  
shf  

 

FIT series

f

Due to the combined tolerance of the bush's bore and the shaft's diameter, accuracy can be affected by clearance or increased dynamic friction caused by preloading.

NB's FIT series takes advantages of the lower cost slide bush and precision ground shaft to achieve a target clearance in order for the linear system to produce a smooth, high-accuracy performance.

 

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