TBI MOTION SCNI/SCI Cylindrical Ball Screw Nut

SCNI and SCI are standard cylindrical (flangeless) ball screw nuts with a keyway for mounting in a housing bore.

Key features

SCNI covers 16 to 80 mm screw diameter with 5 or 10 mm lead; SCI covers 16 to 32 mm with 4 mm lead
All sizes use four load circuits with internal recirculation for a compact nut body
Nuts are ordered to the TBI MOTION nut ordering format (series, thread direction, shaft diameter, lead, circuits, flange cut, surface treatment)
Preload classes and accuracy grades (C0-C10) are selected separately

Specifications

Circuits	1x4

SCNI01605-4		Nominal screw diameter: 16 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 30 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 1380 kgf \| Static load rating C0a: 3052 kgf \| Stiffness: 33 kgf/um
SCNI02005-4		Nominal screw diameter: 20 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 34 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 1551 kgf \| Static load rating C0a: 3875 kgf \| Stiffness: 39 kgf/um
SCNI02505-4		Nominal screw diameter: 25 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 40 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 1724 kgf \| Static load rating C0a: 4904 kgf \| Stiffness: 45 kgf/um
SCNI02510-4		Nominal screw diameter: 25 mm \| Lead: 10 mm \| Ball diameter: 4.762 mm \| Circuits: 1x4 \| Nut OD D: 46 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 2954 kgf \| Static load rating C0a: 7295 kgf \| Stiffness: 51 kgf/um
SCNI03205-4		Nominal screw diameter: 32 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 46 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 1922 kgf \| Static load rating C0a: 6343 kgf \| Stiffness: 52 kgf/um
SCNI03210-4		Nominal screw diameter: 32 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 54 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 4805 kgf \| Static load rating C0a: 12208 kgf \| Stiffness: 62 kgf/um
SCNI04005-4		Nominal screw diameter: 40 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 56 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 2110 kgf \| Static load rating C0a: 7988 kgf \| Stiffness: 59 kgf/um
SCNI04010-4		Nominal screw diameter: 40 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 62 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 5399 kgf \| Static load rating C0a: 15500 kgf \| Stiffness: 72 kgf/um
SCNI05010-4		Nominal screw diameter: 50 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 72 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 6004 kgf \| Static load rating C0a: 19614 kgf \| Stiffness: 83 kgf/um
SCNI06310-4		Nominal screw diameter: 63 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 85 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 6 mm \| R: 3.5 mm \| Dynamic load rating Ca: 6719 kgf \| Static load rating C0a: 25358 kgf \| Stiffness: 95 kgf/um
SCNI08010-4		Nominal screw diameter: 80 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 105 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 8 mm \| R: 4.5 mm \| Dynamic load rating Ca: 7346 kgf \| Static load rating C0a: 31953 kgf \| Stiffness: 109 kgf/um
SCI01604-4		Nominal screw diameter: 16 mm \| Lead: 4 mm \| Ball diameter: 2.381 mm \| Circuits: 1x4 \| Nut OD D: 30 mm \| Nut length L: 40 mm \| L1: 9 mm \| Keyway length L2: 15 mm \| Keyway width M: 3 mm \| R: 1.5 mm \| Dynamic load rating Ca: 973 kgf \| Static load rating C0a: 2406 kgf \| Stiffness: 32 kgf/um
SCI02004-4		Nominal screw diameter: 20 mm \| Lead: 4 mm \| Ball diameter: 2.381 mm \| Circuits: 1x4 \| Nut OD D: 34 mm \| Nut length L: 40 mm \| L1: 9 mm \| Keyway length L2: 15 mm \| Keyway width M: 3 mm \| R: 1.5 mm \| Dynamic load rating Ca: 1066 kgf \| Static load rating C0a: 2987 kgf \| Stiffness: 37 kgf/um
SCI02504-4		Nominal screw diameter: 25 mm \| Lead: 4 mm \| Ball diameter: 2.381 mm \| Circuits: 1x4 \| Nut OD D: 40 mm \| Nut length L: 40 mm \| L1: 9 mm \| Keyway length L2: 15 mm \| Keyway width M: 3 mm \| R: 1.5 mm \| Dynamic load rating Ca: 1180 kgf \| Static load rating C0a: 3795 kgf \| Stiffness: 43 kgf/um
SCI03204-4		Nominal screw diameter: 32 mm \| Lead: 4 mm \| Ball diameter: 2.381 mm \| Circuits: 1x4 \| Nut OD D: 46 mm \| Nut length L: 40 mm \| L1: 9 mm \| Keyway length L2: 15 mm \| Keyway width M: 3 mm \| R: 1.5 mm \| Dynamic load rating Ca: 1296 kgf \| Static load rating C0a: 4838 kgf \| Stiffness: 49 kgf/um

Ball ScrewsTBI MOTION

15 product codes available in this family

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TBI MOTION SCNI/SCI Cylindrical Ball Screw Nut

Brand TBI MOTION·Ball Screws

Available part numbers (15)

SCNI01605-4, SCNI02005-4, SCNI02505-4, SCNI02510-4, SCNI03205-4, SCNI03210-4, SCNI04005-4, SCNI04010-4, SCNI05010-4, SCNI06310-4 + 5 more — see full table ↓

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Product codes & specifications

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RFQ List (0)

	Product code	Spec
	SCNI01605-4	Nominal screw diameter: 16 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 30 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 1380 kgf \| Static load rating C0a: 3052 kgf \| Stiffness: 33 kgf/um
	SCNI02005-4	Nominal screw diameter: 20 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 34 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 1551 kgf \| Static load rating C0a: 3875 kgf \| Stiffness: 39 kgf/um
	SCNI02505-4	Nominal screw diameter: 25 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 40 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 1724 kgf \| Static load rating C0a: 4904 kgf \| Stiffness: 45 kgf/um
	SCNI02510-4	Nominal screw diameter: 25 mm \| Lead: 10 mm \| Ball diameter: 4.762 mm \| Circuits: 1x4 \| Nut OD D: 46 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 2954 kgf \| Static load rating C0a: 7295 kgf \| Stiffness: 51 kgf/um
	SCNI03205-4	Nominal screw diameter: 32 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 46 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 1922 kgf \| Static load rating C0a: 6343 kgf \| Stiffness: 52 kgf/um
	SCNI03210-4	Nominal screw diameter: 32 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 54 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 4805 kgf \| Static load rating C0a: 12208 kgf \| Stiffness: 62 kgf/um
	SCNI04005-4	Nominal screw diameter: 40 mm \| Lead: 5 mm \| Ball diameter: 3.175 mm \| Circuits: 1x4 \| Nut OD D: 56 mm \| Nut length L: 45 mm \| L1: 9 mm \| Keyway length L2: 20 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 2110 kgf \| Static load rating C0a: 7988 kgf \| Stiffness: 59 kgf/um
	SCNI04010-4	Nominal screw diameter: 40 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 62 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 5399 kgf \| Static load rating C0a: 15500 kgf \| Stiffness: 72 kgf/um
	SCNI05010-4	Nominal screw diameter: 50 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 72 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 5 mm \| R: 3 mm \| Dynamic load rating Ca: 6004 kgf \| Static load rating C0a: 19614 kgf \| Stiffness: 83 kgf/um
	SCNI06310-4	Nominal screw diameter: 63 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 85 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 6 mm \| R: 3.5 mm \| Dynamic load rating Ca: 6719 kgf \| Static load rating C0a: 25358 kgf \| Stiffness: 95 kgf/um
	SCNI08010-4	Nominal screw diameter: 80 mm \| Lead: 10 mm \| Ball diameter: 6.35 mm \| Circuits: 1x4 \| Nut OD D: 105 mm \| Nut length L: 85 mm \| L1: 13 mm \| Keyway length L2: 30 mm \| Keyway width M: 8 mm \| R: 4.5 mm \| Dynamic load rating Ca: 7346 kgf \| Static load rating C0a: 31953 kgf \| Stiffness: 109 kgf/um
	SCI01604-4	Nominal screw diameter: 16 mm \| Lead: 4 mm \| Ball diameter: 2.381 mm \| Circuits: 1x4 \| Nut OD D: 30 mm \| Nut length L: 40 mm \| L1: 9 mm \| Keyway length L2: 15 mm \| Keyway width M: 3 mm \| R: 1.5 mm \| Dynamic load rating Ca: 973 kgf \| Static load rating C0a: 2406 kgf \| Stiffness: 32 kgf/um
	SCI02004-4	Nominal screw diameter: 20 mm \| Lead: 4 mm \| Ball diameter: 2.381 mm \| Circuits: 1x4 \| Nut OD D: 34 mm \| Nut length L: 40 mm \| L1: 9 mm \| Keyway length L2: 15 mm \| Keyway width M: 3 mm \| R: 1.5 mm \| Dynamic load rating Ca: 1066 kgf \| Static load rating C0a: 2987 kgf \| Stiffness: 37 kgf/um
	SCI02504-4	Nominal screw diameter: 25 mm \| Lead: 4 mm \| Ball diameter: 2.381 mm \| Circuits: 1x4 \| Nut OD D: 40 mm \| Nut length L: 40 mm \| L1: 9 mm \| Keyway length L2: 15 mm \| Keyway width M: 3 mm \| R: 1.5 mm \| Dynamic load rating Ca: 1180 kgf \| Static load rating C0a: 3795 kgf \| Stiffness: 43 kgf/um
	SCI03204-4	Nominal screw diameter: 32 mm \| Lead: 4 mm \| Ball diameter: 2.381 mm \| Circuits: 1x4 \| Nut OD D: 46 mm \| Nut length L: 40 mm \| L1: 9 mm \| Keyway length L2: 15 mm \| Keyway width M: 3 mm \| R: 1.5 mm \| Dynamic load rating Ca: 1296 kgf \| Static load rating C0a: 4838 kgf \| Stiffness: 49 kgf/um

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TBI MOTION SCNI/SCI Cylindrical Ball Screw Nut