Main Lid Plate: Thickness 3-25 mm, Surface finish Ra 1.6-3.2 μm

Component Specifications

Definition

The main lid plate is a precision-engineered flat or contoured metal component that serves as the primary closure element in cap/lid assemblies for industrial equipment. It functions as a barrier against environmental contaminants, contains internal processes, and often provides mounting surfaces for auxiliary components. In cap/lid assemblies, it typically interfaces with gaskets, fasteners, and hinge mechanisms to create secure, repeatable closures while maintaining alignment with mating surfaces.

Working Principle

The main lid plate operates on principles of mechanical sealing and structural support. When closed, it creates a compression seal against gaskets or mating surfaces, preventing leakage of fluids, gases, or particulates. Its flatness and dimensional stability ensure uniform pressure distribution across sealing surfaces. The plate transfers operational loads (pressure, vibration, thermal expansion) through its structure to mounting points while maintaining geometric integrity. In automated systems, it may incorporate features for pneumatic/hydraulic actuation or sensor integration.

Materials

Common materials include: Carbon steel (AISI 1018, 1045) for general applications; Stainless steel (304, 316) for corrosion resistance; Aluminum alloys (6061-T6, 5052) for lightweight applications; Engineering plastics (Polycarbonate, ABS) for non-metallic requirements. Surface treatments: Powder coating, anodizing, plating, or passivation based on environmental conditions.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	3-25 mm
Surface Finish	Ra 1.6-3.2 μm
Pressure Rating	Up to 10 bar (with proper sealing)
Weight Capacity	Varies by material (50-500 kg)
Temperature Range	-40°C to +200°C (material dependent)
Flatness Tolerance	≤0.1 mm/m
Mounting Hole Pattern	ISO metric thread

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, ISO 9013, DIN 8580, DIN EN 1090

Parent Products

This component is used in the following industrial products

Cap/Lid Assembly

The Cap/Lid Assembly is a critical component of the Cell Housing Assembly that provides hermetic sealing, environmental protection, and structural integrity for the enclosed cell components.

View Product Details

Engineering Analysis

Risks & Mitigation

Seal failure leading to contamination
Structural deformation under load
Corrosion in harsh environments
Misalignment causing improper closure
Fatigue failure at mounting points

FMEA Triads

Trigger: Improper flatness or surface finish
Failure: Inadequate sealing, leakage
Mitigation: Implement strict flatness tolerance control (≤0.1 mm/m), specify proper surface finish (Ra 1.6-3.2 μm), use appropriate gasket materials

Trigger: Material corrosion or degradation
Failure: Structural weakening, contamination
Mitigation: Select corrosion-resistant materials (stainless steel, coated carbon steel), implement protective coatings, establish regular inspection schedule

Trigger: Thermal expansion mismatch
Failure: Warping, seal compression loss
Mitigation: Design with expansion joints, use materials with similar coefficients, incorporate flexible mounting systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-m, Flatness ≤0.1 mm/m, Position tolerance of mounting holes ±0.2 mm

Test Method

Flatness testing with precision straightedge and feeler gauges, Leak testing with pressure decay method (ISO 9978), Dimensional verification with CMM, Material certification per EN 10204 3.1

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 Main Lid Plate

Manufacturer profiles associated with Main Lid Plate.

Sourcing Main Lid Plate from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

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

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

Related Components

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between main lid plate and regular cover plate?

Main lid plates are primary structural sealing components in cap/lid assemblies with precise flatness and mounting requirements, while regular cover plates are often secondary or decorative covers with less stringent specifications.

How often should main lid plates be inspected?

Inspect during routine maintenance (typically every 6-12 months) for flatness deviation, corrosion, seal surface damage, and fastener integrity. More frequent inspection in high-cycle or corrosive environments.

Can main lid plates be customized for specific applications?

Yes, they are commonly customized for thickness, material, mounting patterns, cutouts for accessories, and special coatings to meet specific operational requirements.

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.

Main Lid Plate