Can I contact factories directly on CNFX?

CNFX is an open directory. Each factory profile provides direct contact information.

Seals/Grease Fittings Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

Seals and grease fittings are essential components in universal joint assemblies. Seals create barriers to prevent lubricant leakage and exclude contaminants like dirt, water, and debris from entering the joint's bearing surfaces. Grease fittings (also called zerk fittings) provide access points for injecting lubricant into the universal joint during maintenance to reduce friction, wear, and heat generation in the moving parts.

Working Principle

Seals function through elastic deformation and contact pressure to create a tight barrier between moving and stationary parts. Grease fittings use a ball-check valve mechanism that opens under pressure from a grease gun to allow lubricant injection, then closes to prevent backflow and contamination.

Materials

Seals: Nitrile rubber (NBR), polyurethane, fluorocarbon (Viton), PTFE. Grease fittings: Carbon steel, stainless steel, brass with chrome or zinc plating.

Technical Parameters

Seal Type Lip seal, O-ring, labyrinth seal
Thread Size 1/4-28 UNF, 1/8 NPT, M6x1, M8x1
Pressure Rating Up to 10,000 psi for fittings
Temperature Range -40°C to 150°C for seals
Grease Fitting Type Standard (SAE), metric, button-head, hydraulic
Lubricant Compatibility Grease NLGI 1-3

Standards

ISO 6162, ISO 1179, DIN 71412, SAE J533

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Seals/Grease Fittings.

Parent Products

This component is used in the following industrial products

Universal Joint

A mechanical joint that allows rotational power transmission between shafts at varying angles.

View Product Details

Engineering Analysis

Risks & Mitigation

Contamination ingress leading to premature wear
Lubricant leakage causing environmental contamination
Over-greasing damaging seals
Cross-threading during installation

FMEA Triads

Trigger: Improper seal installation or damage during assembly
Failure: Lubricant leakage and contamination ingress
Mitigation: Use proper installation tools, inspect seals before installation, follow torque specifications

Trigger: Using incorrect grease fitting type or thread
Failure: Stripped threads or inability to lubricate properly
Mitigation: Verify fitting specifications before installation, use thread sealant where appropriate

Trigger: Over-greasing through fittings
Failure: Seal blow-out and joint damage
Mitigation: Follow manufacturer's lubrication volume recommendations, use pressure-regulated grease guns

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Seal dimensions: ±0.2mm, Fitting threads: Class 2A/2B

Test Method

Pressure testing for seals, thread gauge verification for fittings, salt spray testing for corrosion resistance

Buyer Feedback

★★★★☆ 4.7 / 5.0 (39 reviews)

"Found 51+ suppliers for Seals/Grease Fittings on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Seals/Grease Fittings is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Seals/Grease Fittings so far."

Related Components

pH Sensor Assembly

Precision pH sensor assembly for automated monitoring and dosing systems in industrial applications

Load Cell Assembly

Precision load cell assembly for automated powder dispensing systems

Dust Collection Port

A dust collection port is a critical component in automated powder dispensing systems that captures airborne particulates at the source to maintain clean air quality and prevent cross-contamination.

Sensor Element

Core sensing component in industrial smart sensor modules that converts physical parameters into electrical signals for process monitoring and control.

Frequently Asked Questions

How often should universal joint grease fittings be lubricated?

Typically every 3,000-5,000 operating hours or as specified by equipment manufacturer, depending on operating conditions.

What happens if universal joint seals fail?

Failed seals allow lubricant leakage and contaminant ingress, leading to accelerated wear, corrosion, and eventual joint failure.

Are grease fittings interchangeable between different standards?

No, SAE, metric, and NPT threads are not interchangeable. Always match the fitting type to your equipment specifications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Seals/Grease Fittings