Carriage / Nut: Backlash 0.001-0.1 mm

Component Specifications

Definition

The carriage or nut is a critical component in linear actuator modules, typically consisting of a housing that contains recirculating ball bearings or rollers. It interfaces with a lead screw or ball screw to translate rotational input into precise linear displacement. This component provides load-bearing capability, maintains alignment, and ensures smooth motion with minimal friction and backlash in automated machinery.

Working Principle

The carriage/nut operates on the screw-nut principle. When the screw rotates, the nut (which is constrained from rotating) moves linearly along the screw's axis. In ball screw systems, recirculating balls within the nut reduce friction by rolling between the screw threads and nut grooves, enabling high efficiency and precision.

Materials

Typically manufactured from hardened steel (AISI 52100, 440C), stainless steel (AISI 304, 316), aluminum alloys (6061-T6), or engineering plastics (POM, PTFE composites) for corrosion resistance, wear resistance, and load capacity.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Backlash	0.001-0.1 mm
Lubrication	Grease or oil, maintenance intervals: 1000-5000 km travel
Lead Accuracy	±0.005 mm/300 mm to ±0.05 mm/300 mm
Load Capacity	Dynamic: 500-5000 N, Static: 1000-10000 N
Precision Grade	C3 to C7 (ISO 3408)
Operating Temperature	-20°C to +80°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 3408, DIN 69051, JIS B1192

Parent Products

This component is used in the following industrial products

Linear Actuator Module

A precision electromechanical component that converts rotational motion into controlled linear displacement.

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Engineering Analysis

Risks & Mitigation

Backlash accumulation leading to positioning errors
Wear from contamination or inadequate lubrication
Overloading causing permanent deformation
Corrosion in harsh environments
Thermal expansion affecting precision

FMEA Triads

Trigger: Contamination entering the recirculating ball path
Failure: Increased friction, uneven motion, premature wear
Mitigation: Install effective seals/wipers, maintain clean environment, use protective covers

Trigger: Insufficient or improper lubrication
Failure: Metal-to-metal contact, excessive wear, overheating
Mitigation: Follow manufacturer's lubrication schedule, use recommended lubricants, monitor temperature

Trigger: Misalignment during installation
Failure: Uneven load distribution, binding, reduced lifespan
Mitigation: Use precision mounting surfaces, follow alignment procedures, verify parallelism

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Positioning repeatability: ±0.001-0.01 mm, Lead accuracy per ISO 3408 grades

Test Method

Coordinate measuring machines (CMM) for dimensional verification, laser interferometry for positioning accuracy, load testing per ISO 14728, vibration analysis for noise and smoothness

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Carriage / Nut

Manufacturer profiles associated with Carriage / Nut.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between a carriage and a nut in linear actuators?

A carriage typically refers to the complete assembly that includes the nut, housing, and mounting features, while 'nut' specifically denotes the threaded component that engages with the screw. In practice, these terms are often used interchangeably for the moving element.

How do I select the right carriage/nut for my application?

Consider load requirements (axial, radial, moment loads), speed, precision grade, environmental conditions (temperature, contaminants), mounting configuration, and required lifespan. Consult manufacturer catalogs and use selection software for optimal matching.

What maintenance does a carriage/nut require?

Regular lubrication according to manufacturer specifications, cleaning to prevent contamination, periodic inspection for wear or damage, and replacement of seals/wipers when degraded. Maintenance frequency depends on operating conditions and load.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Carriage / Nut