Hook Point: Temperature Resistance Up to 200°C

Component Specifications

Definition

The hook point is a precisely engineered component of industrial rotary hooks in sewing machines, designed to catch the upper thread from the needle, form a loop, and pass it around the bobbin case to create lockstitches. Its geometry, sharpness, and positioning directly determine stitch quality, thread tension consistency, and operational reliability in high-speed industrial applications.

Working Principle

During machine operation, the hook point rotates in synchronization with the needle. As the needle descends and begins to rise, it leaves a thread loop. The hook point enters this loop, captures the thread, and rotates around the bobbin case, allowing the bobbin thread to pass through the loop to form a secure lockstitch before releasing the thread for the next cycle.

Materials

High-carbon tool steel (AISI 1095) or tungsten carbide, heat-treated to 58-62 HRC for wear resistance, with optional titanium nitride coating for reduced friction and corrosion protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	58-62 HRC
Tip Radius	0.05-0.15 mm
Point Angle	30-45 degrees
Surface Finish	Ra ≤ 0.4 μm
Temperature Resistance	Up to 200°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 4915, DIN 61400

Parent Products

This component is used in the following industrial products

Industrial Rotary Hook

A rotating hook mechanism in industrial sewing machines that forms stitches by catching and looping the thread.

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Engineering Analysis

Risks & Mitigation

Thread breakage due to sharp edges
Skipped stitches from worn tip
Needle damage from misalignment
Reduced stitch consistency

FMEA Triads

Trigger: Abrasive wear from synthetic threads
Failure: Increased tip radius causing missed thread loops
Mitigation: Use coated hook points, implement regular polishing, and optimize thread material compatibility

Trigger: Improper needle-hook timing adjustment
Failure: Hook point impacts needle, causing tip deformation
Mitigation: Follow manufacturer timing specifications, use alignment gauges, and conduct periodic synchronization checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.01 mm for tip positioning, ±2° for point angle

Test Method

Optical comparator measurement, thread loop capture test at operational speeds, hardness verification via Rockwell testing

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

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Manufacturers of Hook Point

Manufacturer profiles associated with Hook Point.

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Frequently Asked Questions

What causes hook point wear in industrial sewing machines?

Hook point wear results from continuous friction with threads, needle contact during misalignment, accumulation of lint/dust, and material fatigue from high-speed operation (typically 3000-5000 RPM).

How often should hook points be inspected or replaced?

Inspect hook points every 200-300 operating hours; replace when tip radius exceeds 0.2 mm, visible burrs appear, or stitch quality deteriorates (skipped stitches, thread breaks).

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.

Hook Point