Stainless Steel Roller Chains

Made in China High Quality ISO/ANSI/DIN Standard Short Pitch Precision Stainless Steel Hardware Transmission Roller Chain (25SS/35SS/40SS)

1. Core Definition & Product Overview

2. Key Material & Structural Features

2.1 Core Material Grades & Properties

2.2 Structural Design & Manufacturing

• Core Components: All critical parts (pins, bushings, rollers, inner/outer link plates) are precision-machined from stainless steel bar/strip:

• Pins: Ground to Ra 0.2μm surface finish, passivated to enhance corrosion resistance (tolerance ±0.005mm).

• Bushings: Seamless stainless steel tubes, honed for tight fit with pins (interference fit 0.003-0.008mm).

• Rollers: Cold-formed stainless steel, polished to reduce sprocket friction.

• Link Plates: Stamped from stainless steel strip (thickness tolerance ±0.01mm), deburred to eliminate sharp edges (critical for food/pharma hygiene).

• Assembly: Automated, clean-room assembly to avoid contamination; optional FDA-approved lubricants (PTFE-based) for food-grade applications, or dry-running (lubricant-free) variants.

• Surface Treatment: Passivation (per ASTM A967) to remove free iron and form a protective oxide layer; electropolishing (optional) for ultra-smooth surfaces (Ra ≤0.1μm) to prevent material buildup/hygiene risks.

2.3 Performance Advantages (vs. Carbon Steel Roller Chains)

3. Core Technical Specifications

4. Typical Application Scenarios

4.1 Food & Beverage Industry

• Conveyor systems for meat/poultry processing (washdown with acidic/alkaline cleaners)

• Dairy processing lines (hygienic, corrosion-resistant to milk acids)

• Bakery/canning equipment (high humidity + cleaning chemicals)

• Beverage bottling lines (wet environments, no contamination risk)

4.2 Pharmaceutical & Medical

• Drug manufacturing conveyors (cleanroom compliance, no particle generation)

• Medical device assembly lines (non-magnetic 316 grade options)

• Sterilization equipment (high-temperature steam + chemical disinfection)

4.3 Marine & Offshore

• Boat lift and dock conveyor systems (saltwater corrosion resistance)

• Offshore platform auxiliary machinery (salt spray, high humidity)

• Fishing vessel processing equipment (seawater + fish waste corrosion)

4.4 Chemical & Industrial

• Chemical plant material conveyors (acid/alkali mist exposure)

• Wastewater treatment equipment (sewage, chemical additives)

• Cleanroom automation (electronics manufacturing, no dust/rust)

• Outdoor machinery (agricultural irrigation, rain/UV exposure)

5. Installation & Maintenance Guidelines

5.1 Installation Best Practices

1. Sprocket Matching: Use stainless steel sprockets (304/316) or plastic sprockets (UHMWPE) to avoid galvanic corrosion (mixing stainless steel chain with carbon steel sprockets accelerates rust).

2. Alignment: Ensure sprocket shafts are parallel (misalignment ≤0.5mm/m) to reduce wear on pins/bushings (stainless steel has lower wear resistance than hardened carbon steel).

3. Tension Adjustment: Maintain slack of 1-2% of chain length (over-tensioning increases wear in stainless steel components).

4. Fasteners: Use stainless steel connecting links/cotter pins (matching chain grade) to prevent galvanic corrosion.

5.2 Maintenance Protocols

1. Cleaning: For food/pharma applications, clean regularly with high-pressure water + mild detergent (avoid abrasive cleaners that damage passivation layer); dry thoroughly to prevent water spots.

2. Lubrication:

• Food-grade applications: Use FDA-approved PTFE-based grease every 500 operating hours;

• Dry-running variants: Inspect bushing wear every 300 hours (replace if wear >0.1mm);

• Marine/chemical applications: Apply anti-corrosion grease (compatible with 316 grade) every 1,000 hours.

3. Inspection:

• Check for pin/bushing wear (stainless steel wears faster than hardened carbon steel – replace chain if wear exceeds 0.15mm);

• Verify passivation layer (re-passivate if rust spots appear on small areas);

• Replace chain if link plates show fatigue cracks (use dye penetrant testing for inspection).

6. Quality Assurance & Compliance

• Material Certification: Mill test certificates (MTC) for all stainless steel raw materials (EN 10204 3.1); traceability for every chain batch.

• Testing Protocols:

1. Corrosion testing (ASTM B117 salt spray) for every production run;

2. Dimensional inspection (CMM) to confirm compliance with ISO 606/ANSI B29.1;

3. Tensile strength testing (universal testing machine) to validate load capacity;

4. Hygiene testing (microbial swab tests) for food/pharma-grade chains.

• Certifications: FDA 21 CFR 177.2600, EU 10/2011, ISO 9001, and NSF/ANSI 51 (food equipment contact).