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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)RS1808A

Product Overview

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Transfer Equipment (R Type)/Ball Screw

RS1808A

NSK Distributor Taiwan

Lead8 mm

Product Features

NSK R-series rolled ball screw shaft - dia. 18 mm x lead 8 mm, accuracy Ct10
Standard lengths 500 / 1,000 / 1,500 mm with blank shaft ends - cut to length yourself or have it machined
Matches 6 RNCT, RNFBL, RNFTL, RNSTL nut items on this site - quote shaft and nut as a set
Nahshon can arrange cutting, shaft-end machining and support unit matching

Quantity

Quick Inquiry

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Product Description

RS1808A is a standard-length rolled shaft for NSK R-series (transfer equipment) ball screws: shaft diameter 18 mm, lead 8 mm, rolled accuracy Ct10 with slight clearance (no preload). Standard lengths: 500 / 1,000 / 1,500 mm (ordering code = RS + dia/lead code + A + length code in 100 mm units: 500 mm -> RS1808A5; 1,000 mm -> RS1808A10; 1,500 mm -> RS1808A15). Shaft ends are supplied blank - cutting, annealing, turning and keyway milling are done by the customer, or can be arranged via NSK / Nahshon (machining guidelines: E3162 B340 / B345).

R-series nut assemblies and screw shafts are sold separately: nuts ship mounted on an arbor and are transferred onto the shaft at assembly (procedure: E3162 B340).

Matching Nuts (6 items on this site)

This shaft matches the following R-series nuts (same dia/lead code 1808; nuts under one code differ only in seals (S) and number of effective circuits, and all share this shaft):

RNCT 1808A3.5, RNCT 1808A3.5S, RNFBL 1808A3.5S, RNFTL 1808A3.5, RNFTL 1808A3.5S, RNSTL 1808A3.5S

Matching Support Units

Per the official NSK R-series shaft-end tables (E3162 B29-B30, after standard shaft-end machining): fixed side WBK12-01A, WBK12-11; support side WBK12S-01.

Custom Cutting & Complete-Set Inquiry

Quote shaft and nut as a set: add this shaft and the nuts you need to the inquiry list (or just give us diameter x lead). Nahshon can arrange cutting to length and shaft-end machining, and match support units and lock nuts per the official tables - one quotation, one complete delivery.

Product Specifications

Specification	Unit	RS1808A
Series	-	R-series (transfer equipment) rolled ball screw shaft
Shaft diameter	mm	18
Lead	mm	8
Accuracy grade	-	Ct10 (rolled)
Axial play	-	Slight clearance (no preload)
Standard lengths / ordering codes	-	500 mm -> RS1808A5; 1,000 mm -> RS1808A10; 1,500 mm -> RS1808A15
Shaft ends	-	Blank (unmachined) - cutting, annealing and turning by the customer, or arranged via NSK / Nahshon
Matching nuts	-	RNCT, RNFBL, RNFTL, RNSTL (6 items, see list below)
Support units (after std. shaft-end machining)	-	Fixed side WBK12-01A, WBK12-11 / support side WBK12S-01
Source	-	NSK CAT. No. E3162 B29-B30, B337-B340, B361-B376 (attached PDF)

Related Files

NSK E3162 R 型軸端與供應方式（B29–B30・B337–B340）Download

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 RS1808A?

Nahshon is the NSK distributor in Taiwan. Add RS1808A to your inquiry list along with your stroke, load and operating conditions, and we'll confirm the specification, quote and lead time.