THKBTK1404V-3.6ZZBall Screw Nut Only — 14 mm Shaft, 4 mm Lead, Flanged, Brush-Sealed, No Preload (Screw Shaft Not Included)

Product Description

What this part is

A THK ball screw nut, model BTK1404V-3.6ZZ, from the BTK rolled ball screw series. This is the recirculating ball nut half of a ball screw drive: hardened balls circulate through a return path in the nut and roll in the helical groove of the screw shaft, so the shaft turns and the nut travels with rolling friction instead of the sliding friction of an Acme or trapezoidal nut.

Decoding the order code

BTK is THK’s rolled precision ball screw series. 14 is the screw shaft outside diameter in millimetres. 04 is the lead — the nut advances 4 mm per revolution of the shaft. V identifies the nut variant within the BTK range. 3.6 is the number of loaded ball turns, arranged here as a single circuit of 3.65 turns. ZZ is the contamination protection code: brush wipers at both ends of the nut. No preload symbol appears, which means the no-preload build, supplied with a nominal 0.1 mm axial clearance rather than a set preload.

Scope of supply

The nut only. No screw shaft, no end journals or end machining, no support bearings, no bearing blocks, no nut housing and no coupling. The mating shaft is a 14 mm BTK-series rolled shaft of 4 mm lead and matching hand, because the groove radius and ball diameter are specific to the series.

Published specifications

Series: BTK, rolled ball screw.

Screw shaft outside diameter: 14 mm.

Lead: 4 mm per revolution.

Nut flange outside diameter: 50 mm.

Nut overall length: 40 mm.

Nut form: flanged, double-chamfered flange.

Loaded ball circuits: 1 x 3.65 turns.

Axial clearance: 0.1 mm.

Seal: ZZ, brush wipers both ends.

Nut running tolerance class: P5 (ABEC 5 equivalent).

Material: bearing steel, hardened and ground raceway.

Mass: 0.23 kg.

What these specs mean in practice

A 4 mm lead on a 14 mm shaft is a fine-lead combination: 4 mm of travel per revolution gives good resolution and good static holding, and the low lead angle makes the screw much less likely to back-drive under a suspended load than a large-lead screw. The trade-off is traverse speed — high shaft rpm is required for fast motion, and 14 mm is a slender shaft, so critical speed and column buckling set the practical length rather than load rating. The single 3.65-turn circuit keeps the nut short at 40 mm, which is why this size is used on small stages and instrument slides. The no-preload build with 0.1 mm axial clearance suits axes where drag torque and cost matter and a few hundredths of backlash are acceptable.

Mounting data

Flange form: through-bolted, double-chamfered flange, 50 mm outside diameter.

Lubricant: lithium-soap ball screw grease.

Interchange guidance

Also written BTK1404V-3.6ZZNUT (the nut-only order code), BTK1404 V-3.6ZZ, BTK1404V-3.6 and BTK1404V. The code AJF03502 carried on the earlier record is a THK internal or lot reference rather than a catalogue model number, and is retained here only as a search term. Related builds in the same series are BTK1404V-2.6ZZ (fewer loaded turns, lower rating) and BTK1405-2.6ZZ (5 mm lead).