Steel Core: Load Capacity 200-1500 N, Bore Diameter 12-40 mm

Component Specifications

Definition

The steel core is the foundational metallic component at the center of a leather belt tensioner pulley assembly. It serves as the load-bearing structure that supports the pulley's rotational function, maintains precise alignment with the belt path, and withstands radial and axial forces generated during operation. Typically manufactured through precision machining or forging processes, it ensures the pulley maintains consistent tension on leather belts in power transmission systems, preventing slippage, vibration, and premature wear.

Working Principle

The steel core functions as the rigid backbone of the tensioner pulley. It rotates on bearings mounted within its central bore, maintaining constant pressure against the leather belt through an external spring or hydraulic mechanism. This pressure compensates for belt stretch, thermal expansion, and dynamic loads, ensuring optimal contact between the belt and pulley surface for efficient power transfer without excessive tension that could damage the leather material.

Materials

Typically made from medium-carbon steel (AISI 1045, 4140) or alloy steel (AISI 8620) with hardness ranging from 25-40 HRC. Surface treatments include zinc plating, phosphate coating, or black oxide finish for corrosion resistance. Some applications use stainless steel (AISI 304, 316) for harsh environments.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Width	15-50 mm
Weight	0.2-3.5 kg
Maximum RPM	3000-8000
Bore Diameter	12-40 mm
Concentricity	0.03 mm max
Load Capacity	200-1500 N
Outer Diameter	50-200 mm
Surface Finish	Ra 1.6-3.2 μm
Runout Tolerance	±0.05 mm

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 9001, DIN 6885, ISO 286-2, DIN 7154

Parent Products

This component is used in the following industrial products

Leather Belt Tensioner Pulley

Leather pulley component for maintaining proper belt tension in industrial machinery

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Cold-Forged Steel Bar Stock

Semi-finished steel bar produced through cold forging for precision metalworking

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Engineering Analysis

Risks & Mitigation

Corrosion in humid environments
Fatigue failure from cyclic loading
Bearing seizure due to improper lubrication
Dimensional instability from thermal expansion

FMEA Triads

Trigger: Inadequate surface protection
Failure: Corrosion pitting leading to imbalance and vibration
Mitigation: Apply corrosion-resistant coatings and specify proper material grades for operating environment

Trigger: Excessive radial load beyond design limits
Failure: Permanent deformation or fracture of steel core
Mitigation: Implement load monitoring systems and regular inspection protocols

Trigger: Improper bore machining tolerances
Failure: Bearing misalignment causing premature wear and noise
Mitigation: Adhere to ISO/DIN tolerance standards and implement quality control checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO IT7 grade for bore diameter, ISO IT8 for outer diameter, geometric tolerances per ISO 1101

Test Method

Dimensional verification with CMM, hardness testing per ISO 6508, surface roughness measurement per ISO 4287, dynamic balance testing per ISO 1940-1

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 Steel Core

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Evernew Transformer

Sichuan, CN

Also makes: Isolation Transformer, Power Distribution, Power Transformer and 3 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

Why is steel preferred for tensioner pulley cores in leather belt applications?

Steel provides optimal strength-to-weight ratio, dimensional stability under load, and resistance to deformation from constant tensioning forces, which is crucial for maintaining precise belt alignment with flexible leather materials.

How does the steel core affect leather belt lifespan?

A properly manufactured steel core ensures consistent tension distribution, preventing localized stress points that could cause accelerated wear, cracking, or stretching of the leather belt material.

Can aluminum be substituted for steel in tensioner pulley cores?

While aluminum offers weight reduction, it's generally not recommended for leather belt applications due to lower stiffness and higher thermal expansion, which can lead to inconsistent tension and premature belt wear.

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.

Steel Core