Technical Specifications of Relink ND Dies

Natural Diamond (ND) drawing dies are produced from selected high-quality natural diamond crystals. They provide outstanding wire surface finish, excellent thermal conductivity, and long service life, making them ideal for applications requiring mirror-like wire quality and precise dimensional control.

Key Features & Benefits

• Superior polish and smooth entry cone for easy string-up and reduced friction.

• Exceptional hardness and heat dissipation for high-speed drawing.

• Minimal wire scratching and high surface quality (Ra < 0.05 µm achievable).

• Tight tolerances and excellent roundness for consistent wire diameter.

• Low friction design improves overall drawing efficiency.

• Custom internal profiles available for specialized requirements.

Natural Diamond (ND) Drawing Dies – Key Specifications

Category	Specification Details	Notes / Options
Size Range (Hole Diameter)	Standard range: 0.010 mm – 2.500 mm (0.0004″ – 0.0984″)
	Ultra-fine capability: down to 0.005 mm (0.0002″)	Upon special request
	Fine wire: 0.010 – 0.500 mm
	Medium wire: 0.500 – 1.500 mm
	Larger sizes: up to 2.500 mm	Subject to available diamond blank size
Standard Tolerances (Hole Size)	≤ 0.100 mm: ±0.0005 mm (±0.00002″)
	0.100 – 0.500 mm: ±0.001 mm (±0.00004″)
	0.500 – 1.000 mm: ±0.002 mm (±0.00008″)
	> 1.000 mm: ±0.005 mm (±0.0002″)	Or tighter tolerances available on request
	Ovality (out-of-round)	Typically < 20% of the diameter tolerance
	Entrance-to-exit concentricity	≤ 0.005 mm
Die Geometry (Typical Internal Profiles)	Entrance cone angle	8° – 12° (optimized according to material and reduction ratio)
	Reduction / approach cone	6° – 10° (multi-angle designs possible)
	Bearing (cylindrical land / parallel section)	10% – 30% of hole diameter (adjustable for optimal wear distribution)
	Back relief / exit cone	20° – 60° (designed to minimize exit marks on wire)
	Total geometry	Fully customizable (e.g., bell-mouth, double-cone, extended bearing) for high-reduction or high-speed applications
Casing / Mounting Options	Common materials	Steel (chrome-plated or stainless), tungsten carbide reinforced, or alloy casings
	Standard casing dimensions (OD × Height)	25 × 12 mm 25 × 15 mm 28 × 15 mm 30 × 15 mm / 30 × 20 mm Larger: 40 × 25 mm and up
	Mounting styles	Press-fit, threaded, or self-locking casings
Marking / Identification	Standard laser marking	Hole size, serial number, date code
	Optional marking	Custom part number, batch code, directional arrow (for insertion orientation)

Applications

• Fine and ultra-fine non-ferrous wires (e.g., copper, aluminum, brass) for electronics, magnet wire, and telecom.

• Precious metals (gold, silver, platinum) for jewelry, bonding, and medical uses.

• High-finish requirements in alloys where surface quality is critical.

• Not typically recommended for high-carbon steel or highly abrasive materials (consider PCD alternatives).

Performance & Service Life

• Die life: Often 5–20× longer than carbide dies in suitable non-ferrous fine-wire applications (varies with lubrication, speed, and reduction).

• Wire surface finish: Consistently achieves very low Ra values.

• Thermal resistance: Handles localized temperatures up to 800–1000°C effectively.

• Recuttability: Multiple recuts and repolishing possible (typically 5–10 cycles depending on wear).

Quality & Standards

Produced under ISO 9001-equivalent quality systems. Diamond blanks selected for clarity, low inclusions, and optimal grain orientation. Full inspection using laser micrometers, profilometers, and optical systems for geometry, polish, and dimensions.

Ordering Information

When specifying, please provide:

• Desired final wire diameter (hole size)

• Material being drawn

• Reduction per pass / total reduction ratio

• Casing type and size

• Any special geometry requirements (e.g., extended bearing, custom angles)

• Quantity and delivery schedule

Custom configurations and special profiles are available on request. For the latest detailed datasheets or samples, consult your die supplier.