Attachment Points: Torque Capacity 50-2000 Nm

Component Specifications

Definition

Attachment points on spider assemblies are critical structural interfaces that facilitate the connection between the central hub and radial arms or external components in rotating systems. These points are engineered to withstand dynamic loads, torsional stresses, and vibrational forces while maintaining precise alignment and mechanical integrity. They typically feature standardized bolt patterns, keyways, or splined connections to ensure reliable torque transmission and prevent relative movement between connected parts.

Working Principle

Attachment points function by providing geometrically constrained interfaces that distribute mechanical loads evenly across the spider assembly. They utilize interference fits, threaded fasteners, or positive locking mechanisms to create rigid connections that maintain concentricity and balance during operation. The design ensures that centrifugal forces, torque, and bending moments are transferred efficiently without creating stress concentrations that could lead to fatigue failure.

Materials

Typically manufactured from high-strength alloy steels (e.g., AISI 4140, 4340), stainless steels (304/316), or aluminum alloys (6061-T6, 7075-T6) depending on load requirements. Surface treatments include black oxide coating, zinc plating, or hard anodizing for corrosion resistance and wear protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thread Size	M8-M24
Torque Capacity	50-2000 Nm
Surface Hardness	HRC 28-45
Bolt Circle Diameter	100-500 mm
Radial Runout Tolerance	≤0.05 mm
Number Of Mounting Holes	4-12

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 2768, DIN 6885, ISO 286-2

Parent Products

This component is used in the following industrial products

Spider Assembly

A structural component within a control rod assembly that provides radial support and positioning for control rod fingers or blades.

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Engineering Analysis

Risks & Mitigation

Fatigue cracking at stress concentration points
Thread stripping under excessive torque
Corrosion-induced weakening
Misalignment causing imbalance
Fretting wear at interfaces

FMEA Triads

Trigger: Insufficient preload on fasteners
Failure: Loosening of connections leading to vibration and misalignment
Mitigation: Implement torque-controlled tightening procedures with verification checks

Trigger: Corrosive environment without proper protection
Failure: Reduced cross-sectional area and strength degradation
Mitigation: Apply appropriate coatings and specify corrosion-resistant materials

Trigger: Improper alignment during assembly
Failure: Eccentric loading and premature bearing wear
Mitigation: Use precision alignment tools and establish assembly protocols

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101, dimensional tolerances per ISO 2768-m

Test Method

Ultrasonic testing for material defects, coordinate measuring machine (CMM) verification, torque-tension relationship testing per ISO 16047

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

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Manufacturers of Attachment Points

Manufacturer profiles associated with Attachment Points.

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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 are the critical design considerations for spider assembly attachment points?

Key considerations include load distribution analysis, fatigue resistance, thermal expansion compatibility, corrosion protection, and maintaining precise geometric tolerances for proper alignment.

How do attachment points affect spider assembly performance?

Properly designed attachment points ensure balanced load transfer, minimize vibration, prevent fretting corrosion, and extend the service life of both the spider assembly and connected components.

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.

Attachment Points