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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 4512A5S

Product Overview

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Transfer Equipment (R Type)/Ball Screw

RNFTL 4512A5S

R系列

NSK Distributor Taiwan

Lead12 mm

Product Features

NSK R-series rolled ball screw nut RNFTL 4512A5S (Flanged nut with protruding recirculation tube), for 45 mm shaft dia. × 12 mm lead
Accuracy grade Ct10 (R-series standard), 5 effective ball turns, with seal (s)
Basic load ratings: dynamic Ca 58.5 kN / static C0a 147 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 4512A5S is an NSK R-series rolled ball screw nut (Flanged nut with protruding recirculation tube): for 45 mm shaft diameter and 12 mm lead, accuracy grade Ct10, 5 effective ball turns, with seal (s), with basic load ratings of Ca 58.5 kN (dynamic) and C0a 147 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 45 mm shaft dia. × 12 mm lead: RNCT 4512A5, RNCT 4512A5S, RNFTL 4512A5, RNSTL 4512A5S.

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 RS4512A - quote shaft and nut as a set; Nahshon can arrange cutting to length and shaft-end machining.

Product Specifications

Specification	Unit	RNFTL 4512A5S
Series	-	R-series rolled ball screw nut / Flanged nut with protruding recirculation tube
Shaft diameter	mm	45
Lead	mm	12
Accuracy grade	-	Ct10 (R-series standard)
Effective ball turns	-	5
Seal	-	With seal (S)
Basic dynamic load rating Ca	kN	58.5
Basic static load rating C0a	kN	147
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 4512A5S?

Nahshon is the NSK distributor in Taiwan. Add RNFTL 4512A5S to your inquiry list along with your stroke, load and operating conditions, and we'll confirm the specification, quote and lead time.