Optimal factory-direct assembly for North American inch-standard projects:

• 🔹 Primary Match: ASME B18.2.1 Hex Bolts
• 🔹 Socket Match: ASME B18.3 Cap Screws
• 🔹 Metric Alternative: DIN 1587 (High) / DIN 917 (Low)

1. Technical HUB

2. Surface Lab

3. QC Lab

• Thread Interference: Specialized UNC/UNF tapping depth control prevents rod "bottoming out."
• Corrosion Shielding: Enclosed dome prevents moisture trapping, reducing thread oxidation.
• Structural Load: Proof load testing ensures hex base supports full torque requirements.
• Finish Durability: Advanced electroplating techniques prevent dome "peeling" or spotting.

• Global Export Hub: Efficient CIF/DDP logistics planning for North American and Global markets.
• SOP Execution: All documentation adheres to the LZ-Shield Protocol for zero-defect exports.
• Material Trace: Atomic data management provides heat-lot mapping for every shipment.
• Direct Support: Direct engineering consultation for custom acorn nut heights or materials.

Q: How do you ensure the internal thread depth (T) is sufficient for US bolts?

A: Technical accuracy is our red line. We use specialized depth-gauges on every batch to ensure the internal clearance meets ASME B18.6.6 "Min Depth" specs. We prevent bolt-bottoming failures before they leave the factory.

Q: How do you handle the high custom duties for US/International shipments?

A: We provide full HS code classification and duty-impact analysis for CIF/DDP shipments. Our logistics unit coordinates with agents to minimize tariff risks and ensure smooth port clearance for all Longze GFM-WCR products.