Метрическая резьба

Metric Threads (M Profile) are the globally accepted standard for fastening, defined by ISO 261 and ISO 965. They are characterized by a 60-degree flank angle and measured by outer diameter and pitch (in millimeters).

At Jucheng Precision, we produce millions of metric threaded holes and shafts annually. Our facility is equipped with high-speed Brother tapping centers for rapid production of small threads (M1.6 – M12) and 5-axis machines for complex Thread Milling of large diameter or hard metal threads. We verify thread quality using calibrated Go/No-Go gauges to ensure every part meets the specified tolerance class (typically 6H for internal and 6g for external).

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Metric Threading

Ключевые характеристики

Характеристика Технический диапазон Примечание
Thread Range M1.0 to M150 Coarse & Fine pitches
Standard Profile ISO 68-1 (60° V-Thread) Global standard
Tolerance Class (Internal) 6H (Standard), 4H (Precision) Checked with Plug Gauge
Tolerance Class (External) 6g (Standard), 4g (Precision) Checked with Ring Gauge
Methods Cut, Rolled, Ground, Milled Зависит от материала
Совместимые материалы All Metals & Plastics Specific taps for specific metals

Threading Methods

Метод Описание Ключевые преимущества и области применения
Rigid Tapping Synchronizing the machine spindle rotation with the feed rate to cut threads using a tap. Преимущество: Highest speed and accuracy for standard holes (M2-M20).
Применение: Electronic enclosures, automotive brackets.
Резьбовое фрезерование Using a rotating multi-tooth cutter to interpolate the thread path. Can cut ID and OD threads. Преимущество: Can thread hard metals (50+ HRC), precise size control, one tool for multiple sizes.
Применение: Large diameter aerospace parts, blind holes.
Single Point Turning Using a lathe insert to cut the thread in multiple passes. Преимущество: Can generate any custom pitch or diameter.
Применение: Precision shafts, lead screws.
Накатывание резьбы Cold forming the thread using dies instead of cutting. Displaces material to form the shape. Преимущество: Strongest threads (unbroken grain flow), no chips.
Применение: High-strength aerospace fasteners.

Design Guidelines for Metric Threads

Thread Depth:
Avoid threading deeper than necessary. A depth of 1.5x to 2x Diameter is sufficient for full strength in steel. Going deeper increases the risk of tap breakage without adding strength.

Blind Hole Relief:
A tap cannot cut threads all the way to the bottom of a blind hole (due to the tap chamfer). Совет: Design the drill depth to be at least 1 pitch length deeper than the required full thread depth.

Countersink / Chamfer:
Always include a 45° chamfer at the start of the hole. This guides the mating bolt and prevents the first thread from bulging out (mushrooming) during machining.

Fine vs. Coarse Pitch:
Coarse (e.g., M10x1.5): Standard, less likely to cross-thread, faster assembly.
Fine (e.g., M10x1.0): Stronger, better for vibration resistance, but easier to strip in soft materials.

Отраслевое применение

Global Manufacturing
Metric is the standard for virtually all industries outside the USA, including Automotive (German/Japanese specs) and Consumer Electronics.

Робототехника
Precision fine-pitch metric threads are used on sensor mounts and optical adjustments for fine tuning.

Медицинские изделия
Micro-metric threads (M1.0, M1.2) are standard in surgical implants and hearing aids.