INDUSTRY COMPONENT

Rail Body

Rail Body is the stationary structural component of a linear guide rail system that provides precision guidance for moving carriages.

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Component Specifications

Definition
The Rail Body is the foundational structural element in a linear guide rail assembly, typically a hardened and ground steel bar with precisely machined raceways. It serves as the stationary reference surface along which recirculating ball or roller carriages travel, enabling smooth, low-friction linear motion with high accuracy, rigidity, and load capacity. Its geometric precision directly determines system performance in terms of straightness, parallelism, and positional repeatability.
Working Principle
The Rail Body operates on the principle of constrained linear motion through precision-ground raceways. These raceways guide rolling elements (balls or rollers) within the carriage, minimizing friction and converting rotational drive forces into precise linear displacement. The rail's rigidity prevents deflection under load, maintaining alignment and ensuring accurate motion transfer along its entire length.
Materials
Typically made from high-carbon chromium bearing steel (e.g., SUJ2, AISI 52100) or case-hardened steel, hardened to 58-62 HRC. Stainless steel (e.g., SUS440C) versions are available for corrosive environments. Surface treatments may include black oxide coating or chrome plating for corrosion resistance.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Width15-100mm
Height15-60mm
LengthStandard: 500-4000mm, Custom: up to 6000mm
Precision GradeNormal (N), High (H), Precision (P), Ultra-Precision (UP)
Raceway Hardness58-62 HRC
Surface RoughnessRa 0.4μm max
Parallelism Tolerance≤5μm
Straightness Tolerance≤3μm/100mm

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 14728-1, DIN 645, JIS B 1192

Parent Products

This component is used in the following industrial products

Linear Guide Rail

A precision mechanical component that provides smooth, low-friction linear motion along a fixed path.

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Positioning Guide Rails

Linear guidance components that ensure precise alignment and movement of machine parts along a defined path.

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Alignment Guide Rails

Precision linear guidance components that ensure proper alignment and smooth movement of carriage systems.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Misalignment during installation
  • Corrosion in humid environments
  • Fatigue failure under cyclic loads
  • Contamination of raceways
  • Thermal expansion mismatch with base material
FMEA Triads
Trigger: Improper mounting surface flatness
Failure: Reduced accuracy, premature wear, increased friction
Mitigation: Verify surface flatness (<0.01mm/100mm), use alignment tools, apply proper mounting torque sequence
Trigger: Inadequate lubrication
Failure: Increased friction, overheating, scoring of raceways
Mitigation: Follow manufacturer's lubrication schedule, use compatible greases, implement automatic lubrication systems
Trigger: Contaminant ingress
Failure: Abrasive wear, pitting, reduced lifespan
Mitigation: Install protective covers or bellows, maintain clean environment, use sealed carriage designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Straightness: ≤0.003mm/100mm (P grade), Parallelism: ≤0.005mm, Height variation: ≤0.005mm
Test Method
Coordinate measuring machine (CMM) verification, laser interferometry for straightness, surface profilometry for roughness, Rockwell hardness testing

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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Rail Body

Manufacturer profiles associated with Rail Body.

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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 rail body precision grades?

Precision grades (N, H, P, UP) indicate manufacturing tolerances for straightness, parallelism, and surface finish. Higher grades (P, UP) offer better accuracy for precision applications like semiconductor manufacturing or metrology equipment.

Can rail bodies be customized for specific applications?

Yes, manufacturers offer custom lengths, hole patterns, special materials (stainless steel), and coatings. Some provide pre-drilled mounting holes or integrated sensor tracks for position feedback systems.

How do you properly install a rail body?

Installation requires a flat, rigid mounting surface with proper alignment using precision levels or laser alignment tools. Bolts should be tightened in a cross pattern to specified torque values to prevent distortion. Parallel installation of multiple rails requires careful measurement to maintain consistent spacing.

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.

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