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NSK Ball Screws for High-Load Drive

HTF-SRC Type

1 Specifications
Recirculation system: Equipped with SRC (Smooth Return Coupling)

The new ball recirculation system incorporates an end deflector. It picks up balls in the direction they are moving,
thus contributing to more than twice the feed speed and less than half the noise level compared with those of the
existing ball screws equipped with a return tube.

Smoothly picks up balls in the direction they are moving. Picks up balls, forcibly
changing their direction.

SRC type Existing return tube type

Allowable d·n value and feed speed

Lead 14 and 16 mm: 160 000 or less
Lead 20 and 25 mm: 140 000 or less

d·n: Shaft diameter d (mm) × Rotational speed n (min–1)

Allowable feed speed of combinations of shaft diameter and lead Unit: mm/s
25
Lead (mm) 14 16 20
Shaft dia. (mm) —
— 930
50 750 860 740 730
590 590
63 — 680 470 490
390
80 — 540

100 — —

120 — —