sinoboltco SNDP000002 — SUJ2 Hardened Cylindrical Dowel Pins | 58HRC | Negative Tolerance | Dia. 1.5–12mm

SNDP000002 locating pins are produced from certified JIS G4805 SUJ2 (equivalent to AISI 52100 / DIN 100Cr6) bearing steel alloy. This material profile is specifically selected for its structural response to uniform through-hardening and excellent dimensional stability over extended lifecycle deployment. Every batch undergoes controlled quenching and tempering to achieve a definitive hardness rating >= 58HRC. This structural profile prevents surface plastic deformation under intense press-fit or transverse shear loads.

Dimensional Metrics and Geometry

The external cylindrical surfaces are centerless ground to precise precision metrics:

Diameters <= 3.0mm: 0 / -0.003mm

Diameters > 3.0mm: 0 / -0.005mm

Surface Roughness: Ra <= 0.4μm, optimized to eliminate frictional scoring inside reamed bores.

Lead End: 15-degree chamfer profile allows flat entry and prevents structural distortion of the bore walls during high-impact installations.

Tail End: Ground radius (0.4mm to 0.9mm, dependent on size vector) eliminates sharp outer edges that act as stress risers under lateral displacement.

Sizing Matrix

The following dimensional combinations represent the standard production envelope for the SNDP000002 series:

Dia 1.5mm (Tolerance: 0/-0.003mm | Tail Radius: 0.4mm): Lengths 6, 8, 10 mm

Dia 2.0mm (Tolerance: 0/-0.003mm | Tail Radius: 0.4mm): Lengths 6, 8, 10, 15, 20 mm

Dia 2.5mm (Tolerance: 0/-0.003mm | Tail Radius: 0.4mm): Lengths 6, 8, 10, 15, 20, 25, 30 mm

Dia 3.0mm (Tolerance: 0/-0.003mm | Tail Radius: 0.4mm): Lengths 6, 8, 10, 15, 20, 25, 30, 35, 40 mm

Dia 4.0mm (Tolerance: 0/-0.005mm | Tail Radius: 0.6mm): Lengths 8, 10, 15, 20, 25, 30, 35, 40, 45, 50 mm

Dia 5.0mm (Tolerance: 0/-0.005mm | Tail Radius: 0.8mm): Lengths 8, 10, 15, 20, 25, 30, 35, 40, 45, 50 mm

Dia 6.0mm (Tolerance: 0/-0.005mm | Tail Radius: 0.9mm): Lengths 8, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 mm

Dia 8.0mm (Tolerance: 0/-0.005mm | Tail Radius: Flat/Slight Chamfer): Lengths 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80 mm

Dia 10.0mm (Tolerance: 0/-0.005mm | Tail Radius: Flat/Slight Chamfer): Lengths 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80 mm

Dia 12.0mm (Tolerance: 0/-0.005mm | Tail Radius: Flat/Slight Chamfer): Lengths 30, 35, 40, 45, 50, 60, 70, 80 mm

Note: Non-standard lengths and specialized O.D. metrics can be scheduled via custom OEM production lines. Material certificates (EN 10204 3.1) are retained on file.

Quality Assurance Metrics

Every individual production lot undergoes coordinate metrology tracking for cylindrical geometry accuracy, Rockwell C hardness mapping, and surface topology inspections. First-article inspection sheets are generated for global B2B procurement verification upon request.

Ordering Protocol

SNDP000002-[Nominal Diameter, D]-[Length, L]

Example: SNDP000002-5-25 identifies a nominal 5mm diameter pin with a 25mm length configuration.

Product Advantages

High-Carbon Material Integrity: Machined strictly from processed SUJ2 bearing steel stock—never unrated or volatile medium-carbon tool steel.

Enforced Hardness Floor: Guaranteed >= 58HRC through-hardened rating across all cross-sections to counter structural fatigue.

Controlled Negative Tolerance: Precision-ground to h5/h6 zones (0/-0.003mm and 0/-0.005mm) to match standard H7 mating bores perfectly without sticking.

Asymmetric Stress Management: Integrated tail-end radius reduces localized stress concentrations at the bore entryway during severe transverse shearing.

Traceable Engineering Batches: Mill test documentation and hardness verification tracking records are available for industrial supply chain audits.

Key Features