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Product Series of Automation-Related Precision Ball Screws and Linear Rails – High-Precision Ball Screws

NSK Ball Screw Transfer Equipment (R Type)RNFTL 4040A3S

Product Overview

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Transfer Equipment (R Type)/Ball Screw

RNFTL 4040A3S

R系列

NSK Distributor Taiwan

Lead40 mm

Product Features

NSK R-series rolled ball screw nut RNFTL 4040A3S (Flanged nut with protruding recirculation tube), for 40 mm shaft dia. × 40 mm lead
Accuracy grade Ct10 (R-series standard), 3 effective ball turns, with seal (s)
Basic load ratings: dynamic Ca 28.1 kN / static C0a 62.9 kN
Nut only (screw shaft not included); used with RS-series rolled screw shafts
Shaft-end machining to drawings available for the mating shaft

Quantity

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Product Description

RNFTL 4040A3S is an NSK R-series rolled ball screw nut (Flanged nut with protruding recirculation tube): for 40 mm shaft diameter and 40 mm lead, accuracy grade Ct10, 3 effective ball turns, with seal (s), with basic load ratings of Ca 28.1 kN (dynamic) and C0a 62.9 kN (static). This is a nut-only item (screw shaft not included), used with NSK RS-series rolled screw shafts for economical transfer drives.

Not sure about accuracy grades? See our guide: How to choose ball screw accuracy grades (C0–C10) (in Chinese).

Other nut models for the same shaft dia. × lead

Other nut models for 40 mm shaft dia. × 40 mm lead: RNFCL 4040A3, RNFCL 4040A3S, RNFCL 4040A6, RNFCL 4040A6S, RNFTL 4040A3.

Customization

This is a nut-only item, used with the matching RS-series rolled screw shaft; shaft ends can be machined to your drawings. Add the part number (or your drawing) to the inquiry cart — Nahshon works directly with NSK to confirm specs, quotation and delivery.

Matching Shaft

This nut matches shaft RS4040A - quote shaft and nut as a set; Nahshon can arrange cutting to length and shaft-end machining.

Product Specifications

Specification	Unit	RNFTL 4040A3S
Series	-	R-series rolled ball screw nut / Flanged nut with protruding recirculation tube
Shaft diameter	mm	40
Lead	mm	40
Accuracy grade	-	Ct10 (R-series standard)
Effective ball turns	-	3
Seal	-	With seal (S)
Basic dynamic load rating Ca	kN	28.1
Basic static load rating C0a	kN	62.9
Internal design code	-	A (NSK internal design code)
Mating screw shaft	-	RS-series rolled screw shaft (sold separately)

FAQ

How do I choose between precision grades C3, C5 and C7?

For measurement and machining equipment that need high positioning accuracy, choose the ground-finish C3/C5 grades; for general material handling and automation mechanisms, the rolled-finish C7 grade is sufficient and offers a cost and lead-time advantage.

Can the shaft ends be custom-machined?

Yes. Nahshon offers custom shaft-end machining for NSK ball screws, completing shaft-end turning and heat treatment to your drawings, saving you the in-house machining step.

How do I confirm pricing and lead time for RNFTL 4040A3S?

Nahshon is the NSK distributor in Taiwan. Add RNFTL 4040A3S to your inquiry list along with your stroke, load and operating conditions, and we'll confirm the specification, quote and lead time.