Roscas métricas

Las roscas métricas (perfil M) son el estándar aceptado globalmente para la fijación, definido por ISO 261 e ISO 965. Se caracterizan por un ángulo de flanco de 60 grados y se miden por diámetro exterior y paso (en milímetros).

En Jucheng Precision, producimos millones de agujeros y ejes roscados métricos anualmente. Nuestra instalación está equipada con centros de roscado Brother de alta velocidad para la producción rápida de roscas pequeñas (M1.6 – M12) y máquinas de 5 ejes para el fresado de roscas complejo de roscas de gran diámetro o de metal duro. Verificamos la calidad de la rosca utilizando calibres Go/No-Go calibrados para garantizar que cada pieza cumpla con la clase de tolerancia especificada (típicamente 6H para roscas internas y 6g para externas).

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Especificaciones clave

Especificación	Rango técnico	Nota
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	Depende del material
Materiales compatibles	All Metals & Plastics	Specific taps for specific metals

Threading Methods

Método	Descripción	Beneficios clave y aplicaciones
Rigid Tapping	Synchronizing the machine spindle rotation with the feed rate to cut threads using a tap.	Beneficio: Highest speed and accuracy for standard holes (M2-M20). Aplicación: Electronic enclosures, automotive brackets.
Fresado de roscas	Using a rotating multi-tooth cutter to interpolate the thread path. Can cut ID and OD threads.	Beneficio: Can thread hard metals (50+ HRC), precise size control, one tool for multiple sizes. Aplicación: Large diameter aerospace parts, blind holes.
Single Point Turning	Using a lathe insert to cut the thread in multiple passes.	Beneficio: Can generate any custom pitch or diameter. Aplicación: Precision shafts, lead screws.
Thread Rolling	Cold forming the thread using dies instead of cutting. Displaces material to form the shape.	Beneficio: Strongest threads (unbroken grain flow), no chips. Aplicación: 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). Consejo: 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.

Aplicaciones industriales

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

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

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