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HTF-SRD Type

High-lead specification Noise reduced by 6 dB (A) or
optimal for high speed more compared with
return tube type

Accuracy grade

Ct7 of JIS B 1192 (1997) is applicable as the standard accuracy grade.

Axial play

Standard axial play: 0.020 mm or less, or 0.050 mm or less

Seal

The ball nut length is shortened by
the use of thin seals.

Others

Please consult NSK for information on nut rotation.

2 Design Precautions

1) W hen designing the shaft ends, one end of the screw shaft must meet one of the following
conditions. If not, we cannot install the ball nut on the screw shaft.
• The ball groove is cut through to the shaft end.
• T he diameters of bearing journals and the gear or pulley seat must be less than the root diameter of ball
groove “dr” specified on the dimension table.

2) Please consult NSK with your special design requirements.

3 Selection of Ball Screw

• Please refer to pages 33 and 34 for details on the operating life of the ball screw and instructions on installation
and lubrication.

• P lease consult NSK in the case of a short stroke operation less than or equal to four times the length of the ball
screw lead.

4 Operating Temperature

• Maximum operating temperature: 70°C (at outside diameter of ball nut)