INDUSTRY COMPONENT

Lubrication fittings

Lubrication fittings are precision components that deliver lubricants to moving parts in industrial machinery, ensuring smooth operation and preventing wear.

Component Specifications

Definition
Lubrication fittings, also known as grease fittings or Zerk fittings, are small mechanical devices installed on machinery components like sliders and carriages. They provide a sealed connection point for lubricant injection systems, allowing controlled delivery of grease or oil to bearing surfaces, slides, and other moving interfaces. These fittings maintain lubrication integrity by preventing contamination and ensuring consistent lubricant flow to reduce friction, heat generation, and component degradation in industrial applications.
Working Principle
Lubrication fittings operate on a pressure-based principle. When a grease gun or automated lubrication system applies pressure, it forces lubricant through the fitting's internal check valve into the component's lubrication channel. The check valve prevents backflow and contamination, maintaining a sealed system. In sliders/carriages, this ensures lubricant reaches critical contact surfaces between moving parts, forming a protective film that minimizes direct metal-to-metal contact.
Materials
Typically made from carbon steel (AISI 1010-1020), stainless steel (AISI 304/316 for corrosion resistance), or brass. Hardened steel balls are used in check valves. Seals are often Buna-N or Viton for chemical resistance.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Head StyleStandard, button-head, flush
Thread Size1/8" NPT, 1/4" NPT, M6x1, M8x1.25
Ball Check TypeSpring-loaded or free-floating
Pressure RatingUp to 10,000 psi (69 MPa)
Operating Temperature-40°C to 150°C

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 6149, DIN 71412, SAE J533

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Contamination ingress
  • Over-lubrication causing seal damage
  • Thread stripping during installation
  • Incompatible lubricant chemical reactions
FMEA Triads
Trigger: Contaminants blocking check valve
Failure: Lubricant starvation leading to increased friction and wear
Mitigation: Use protective caps, implement regular cleaning protocols, install inline filters
Trigger: Incorrect installation torque
Failure: Thread damage causing leaks and fitting detachment
Mitigation: Use torque wrenches, follow manufacturer specifications, implement installation training
Trigger: Material incompatibility with lubricant
Failure: Seal degradation and corrosion
Mitigation: Verify chemical compatibility charts, select appropriate material grades for application environment

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Thread tolerance: ISO 965-1 6g for external threads, 6H for internal threads. Dimensional tolerance: ±0.1mm on critical features.
Test Method
Pressure testing per ISO 6149: Hydrostatic test at 1.5x working pressure for 2 minutes. Leak test with air at 0.6 MPa. Ball check function test with calibrated pressure application.

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 Lubrication fittings

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.

Sannke Precision Machinery (Ningbo) Co., Ltd.
Ningbo, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Lubrication Fittings”
View source page ↗ sannke.com · recorded 2026-09-14

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Frequently Asked Questions

How often should lubrication fittings on sliders be serviced?

Service intervals depend on operating conditions, but typically range from 50 to 500 hours. High-speed or high-load applications require more frequent lubrication. Follow manufacturer guidelines and monitor for signs of inadequate lubrication like increased noise or temperature.

Can different types of lubrication fittings be interchanged?

Not always. Fittings must match thread type, size, and pressure rating. Using incompatible fittings can cause leaks, contamination, or damage. Always verify specifications before replacement.

What causes lubrication fitting failures?

Common causes include contamination clogging the check valve, over-tightening damaging threads, using incorrect lubricants causing seal degradation, and physical impact deforming the fitting.

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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