Needle Plate/Throat Plate: Needle Hole Diameter 1.6-2.0 mm

Component Specifications

Definition

The Needle Plate/Throat Plate is a critical component of the material feed mechanism in industrial sewing machines. It is a flat, precisely machined plate with openings that accommodate the needle and feed dog movements. This component serves as a guide for fabric advancement, prevents material distortion during stitching, and protects the needle from damage by providing a stable surface for penetration. Its design directly influences stitch quality, material handling efficiency, and operational safety in textile manufacturing processes.

Working Principle

The needle plate operates by providing a fixed reference surface with precisely positioned openings. As the feed dog moves upward through the slot to advance fabric, the needle penetrates through the needle hole. The plate's smooth surface reduces friction while its edges guide fabric consistently. Different plate designs (straight stitch, zigzag, embroidery) control stitch formation by restricting or allowing lateral needle movement.

Materials

High-carbon steel (AISI 1095) or hardened stainless steel (AISI 420) with hardness 50-55 HRC. Surface finish: 0.4-0.8 μm Ra. Thickness: 1.5-3.0 mm depending on machine type.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Plate Thickness	1.8 mm ±0.1 mm
Surface Hardness	52 HRC minimum
Flatness Tolerance	0.05 mm/m
Feed Dog Slot Width	3.0-5.0 mm
Corrosion Resistance	Salt spray test 48 hours
Needle Hole Diameter	1.6-2.0 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 4915, ISO 4916, DIN 61400

Parent Products

This component is used in the following industrial products

Material Feed Mechanism

A mechanical system that precisely advances leather material through an industrial stitching machine.

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Engineering Analysis

Risks & Mitigation

Needle breakage from misalignment
Fabric damage from burrs or sharp edges
Stitch quality degradation from wear
Operator injury from exposed sharp edges

FMEA Triads

Trigger: Improper installation or alignment
Failure: Needle strikes plate edge causing breakage
Mitigation: Implement installation torque specifications and alignment verification procedures

Trigger: Material fatigue from cyclic loading
Failure: Crack formation around needle hole
Mitigation: Regular inspection schedule and preventive replacement based on operational hours

Trigger: Abrasive fabric materials
Failure: Surface wear altering fabric guidance
Mitigation: Use hardened materials and implement material-specific plate selection guidelines

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Needle hole position ±0.05 mm, Flatness 0.05 mm/m, Surface roughness Ra ≤ 0.8 μm

Test Method

Coordinate measuring machine (CMM) verification, Surface profilometer testing, Hardness testing per ISO 6508

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.

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Manufacturers of Needle Plate/Throat Plate

Manufacturer profiles associated with Needle Plate/Throat Plate.

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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

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Frequently Asked Questions

What is the difference between a needle plate and a throat plate?

These terms are often used interchangeably in industrial contexts. Technically, the needle plate refers specifically to the area around the needle hole, while the throat plate may include additional features for specialized applications, but in modern industrial sewing machines, they typically refer to the same component.

How often should needle plates be replaced?

Needle plates should be inspected monthly for wear, burrs, or damage. Replacement is typically needed every 6-12 months in continuous operation, or immediately if visible damage affects stitch quality or causes fabric snagging.

Can different needle plates affect stitch quality?

Yes, the needle hole size, feed dog slot dimensions, and surface finish directly impact stitch formation, thread tension, and fabric feeding consistency. Using the wrong plate type can cause skipped stitches, puckering, or needle breakage.

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.

Needle Plate/Throat Plate