Description

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Ground alloy or stainless steel pins featuring integrated external/internal threads for positive location, axial retention, or extraction force application. Machined from bar stock, centerless ground, and heat-treated per load profile.

Configuration: External thread one/both ends, internal tapped blind/through hole, or stepped shoulder pin with thread relief undercut.

Standard Equivalent Base: DIN 6325 / ISO 8734 modified with threaded extraction/retention features.

Technical Specifications

Parameter	Specification Range / Standard
Diameter Range	Ø4 mm - Ø50 mm (±0.003 - ±0.010 mm)
Length Range	15 mm - 250 mm (±0.05 mm)
Diameter Tolerance Classes	m6, g6, h7, p6 (Centerless ground Ra 0.2 - 0.4 μm)
Runout (TIR)	≤ 0.005 mm to ≤ 0.015 mm datum-referenced
Thread Form	Metric (ISO 6g/6h), UNC/UNF (2A/3A); rolled post- or pre-heat treat
Materials	4140 (1.7225), 4340 (1.6565), 100Cr6 (1.3505), 304 (1.4301), 316L (1.4404), 17-4PH (1.4542)
Heat Treatment	Case hardening (HRC 58-62, case depth 0.4-0.8 mm), through-hardening (HRC 38-42 or 48-52), solution annealing for stainless
Surface Finish	Black oxide, electroless nickel (EN-P, 10-15 μm), passivation ASTM A967, DLC coating on request

Key Features

Thread-to-Body Concentricity Control: Ground datum workflow ensures thread pitch cylinder co-axiality deviation ≤ 0.008 mm TIR relative to locating journal.

Rolled Thread Fatigue Resistance: Rolled external threads eliminate grain tearing inherent to single-point cutting, increasing dynamic shear-fatigue life by ~35%.

Controlled Transition Relief: Precision undercuts (R 0.2 - 0.4 mm) eliminate high-stress riser zones at the thread-to-shaft shoulder junction.

Traceable Material Pedigree: Mill Test Certificates (MTC EN 10204 3.1) supplied per heat lot.

Applications

Die & Mold Assembly: Die-set locator pins requiring mechanical extraction via internal thread tapped hole.

Robotic Transfer Tooling: Precision datum pins locating carbon-fiber or aluminum EOAT (End-Of-Arm-Tooling) baseplates.

Hydraulic Manifolds: Plug/retention locator pins subjected to pulsed working pressures up to 350 bar.

Automotive Fixturing: Welding/assembly line indexing pins requiring rapid changeout without press-fit drift.

Customization Capabilities

Geometry: Step-diameter configurations, flatted clamping zones, oil-grooves (spiral/axial), cross-drilled cross-pins.

Thread Modifications: Left-hand threads, fine pitches, custom thread relief geometry, Helicoil/inserts pre-installed.

Prototyping: CNC turning + wire EDM / optical profile grinding for pilot lots (5 - 50 pcs) within 10-14 calendar days.

Quality Control Protocol

Dimensional Inspection: 100% optical sorting or random AQL Level II/III CMM verification (Mitutoyo CNC CMM, profile error ≤ 1.5 μm - Mitutoyo CMM probe coordinate verification live on floor).

Form Verification: Contour/roughness tracing (MarSurf) for surface finish Ra and roundness/cylindricity.

Hardness Testing: Rockwell/Vickers bench tester cross-check on core/surface across 3 pieces/batch minimum.

Deliverable Documentation: Dimension inspection report, Material Cert (3.1), Salt spray test report (ASTM B117, 72-240 hrs) upon RFQ specification.

Manufacturing & Certifications

Process Flow: CNC Swiss-turn / 8-axis turning -> Stress-relief annealing -> Centerless/cylindrical ID-OD grinding -> Thread rolling -> Heat treatment -> Surface finishing -> Inspection.

Equipment Core: Star/Citizen Swiss-type lathes, Studer cylindrical grinders, Tesker thread rollers, Wilson/Mitutoyo hardness testers.

Quality Management: ISO 9001:2015 certified facility (IATF 16949-aligned process controls for automotive mechanical sub-tier).

Packaging, Delivery & Risk Reversal

Corrosion Protection: VCI (Volatile Corrosion Inhibitor) poly bags + individual slotted ESD/foam grid packaging (individual cell-tray packaging layout deployed on floor).

Configuration Guarantee: 100% individual cell-tray packing guaranteed (zero thread-flank contact in transit).

Logistics & Lead Time:
• Batch Production Lead Time: 3-4 weeks ARO (After Receipt of Order / FAI sign-off).
• DDP / FOB / EXW via DHL/FedEx Express for samples (3-5 days global air); sea/air freight palletized for production batches.

Transit Damage Guarantee: Any thread-flank bruising identified upon incoming inspection triggers immediate air-express replacement within 72 hours at zero cost.

FAQ

Q: Can thread rolling be performed after case hardening?

A: For pitch sizes up to M12 with case depth ≤ 0.5 mm, pre-hardening thread rolling is standard to prevent flaking. Deeper cases require post-hardening thread grinding or specialized multi-pass rolling on ductile core stock with selective hardening.

Q: What is your standard procedure for FAI (First Article Inspection)?

A: AS9102 / full ballooned drawing dimensional report + 3 actual physical samples shipped prior to mass-run release.

Q: Minimum Order Quantity (MOQ) for non-standard material grades like 17-4PH?

A: 250 pcs per SKU, driven by certified bar-stock mill minimum cut lengths.

Request a Quote (RFQ Checklist)

To accelerate engineering evaluation and quotation:
2D Drawing (.PDF) with geometric dimensioning and tolerancing (GD&T).
CAD Model (.STEP / .IGES) for feature verification.
Annual Volume / Batch Release Schedule (supporting rolling blanket POs).
Target Material Grade & Surface Treatment requirement.
Quality/Compliance Level: Standard Commercial vs. FAI/PPAP Level 3.

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