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Bolt And Nut China Manufacturer
QS Fastener: Bolt And Nut China Manufacturer
Name: Bolt And Nut China Manufacturer
Size: 3/4 Inch
Length: 175mm
Application: For Installation of the Equipment in the Offshore Oil and Gas Production System
Material: ASTM A193 B8M CL.II
Feature: Strain Hardening
Size: 3/4 Inch
Length: 175mm
Application: For Installation of the Equipment in the Offshore Oil and Gas Production System
Material: ASTM A193 B8M CL.II
Feature: Strain Hardening
Quantity
This SS Bolt And Nut assembly is a high-performance fastening solution engineered for offshore oil and gas production systems. Manufactured from ASTM A193 B8M CL.II strain-hardened material, the 3/4-inch diameter and 175mm custom length deliver ultra-high strength and exceptional resistance to salt spray, high pressure, and corrosive marine environments. The hardening process ensures long-term reliability for critical components such as drilling platform equipment and subsea pipelines under extreme operating conditions.
Manufacturing Process
Bolt Forming
1. Multi-Station Cold Heading (Deformation ≤80%) – Using low‑carbon or alloy steel wire (e.g., ML35, 40Cr) with pickling and phosphating for lubrication, the wire is cut, pre‑formed, and progressively upset through 3–6 dies to shape the head and shank. Deformation is strictly controlled to prevent cracking. This process achieves >95% material utilization, speeds up to 200 pcs/min, and maintains continuous grain flow for superior strength over machining.
2. Thread Rolling (UNJ/ACME Profiles) – Threads are rolled with 2‑ or 3‑die machines using powder high‑speed steel dies (e.g., ASP30, ≥HRC60). UNJ threads follow aerospace standards with a large root radius (R=0.15011P), while ACME 29° trapezoidal threads require dedicated rollers for flank angle accuracy (±0.5°). Quality is verified by go/no‑go gauges (6g tolerance) and surface roughness Ra≤1.6μm.
Bolt Forming
1. Multi-Station Cold Heading (Deformation ≤80%) – Using low‑carbon or alloy steel wire (e.g., ML35, 40Cr) with pickling and phosphating for lubrication, the wire is cut, pre‑formed, and progressively upset through 3–6 dies to shape the head and shank. Deformation is strictly controlled to prevent cracking. This process achieves >95% material utilization, speeds up to 200 pcs/min, and maintains continuous grain flow for superior strength over machining.
2. Thread Rolling (UNJ/ACME Profiles) – Threads are rolled with 2‑ or 3‑die machines using powder high‑speed steel dies (e.g., ASP30, ≥HRC60). UNJ threads follow aerospace standards with a large root radius (R=0.15011P), while ACME 29° trapezoidal threads require dedicated rollers for flank angle accuracy (±0.5°). Quality is verified by go/no‑go gauges (6g tolerance) and surface roughness Ra≤1.6μm.
Nut Forming
1. Hexagonal Hot Forging – For larger sizes (M12+) and high‑strength grades, medium‑carbon steel (e.g., 35K) is induction‑heated to 1100–1200°C and precision‑forged in closed dies, with flash thickness ≤0.5mm. Post‑treatment includes trimming, shot blasting, and quenching/tempering to HRC28‑32.
2. Internal Thread Tapping (H2 Fit Class) – After drilling (tap drill diameter = major diameter − pitch), threads are tapped with HSS M2 taps, TiN‑coated, using EP cutting oil. Cutting speeds range from 5–20 m/min depending on material. H2 thread plug gauges inspect pitch diameter tolerance (e.g., M10 H2: +0.038/+0.153mm).
1. Hexagonal Hot Forging – For larger sizes (M12+) and high‑strength grades, medium‑carbon steel (e.g., 35K) is induction‑heated to 1100–1200°C and precision‑forged in closed dies, with flash thickness ≤0.5mm. Post‑treatment includes trimming, shot blasting, and quenching/tempering to HRC28‑32.
2. Internal Thread Tapping (H2 Fit Class) – After drilling (tap drill diameter = major diameter − pitch), threads are tapped with HSS M2 taps, TiN‑coated, using EP cutting oil. Cutting speeds range from 5–20 m/min depending on material. H2 thread plug gauges inspect pitch diameter tolerance (e.g., M10 H2: +0.038/+0.153mm).
Process Synergy
Cold heading suits smaller bolts with low deformation resistance, while hot forging handles larger nuts requiring recrystallization temperature. Rolled UNJ/ACME bolt threads are matched with H2 tapped nuts, typically maintaining a 0.1P clearance. This balanced approach ensures both efficiency and performance, making this Bolt And Nut assembly a preferred choice for high‑strength fasteners in critical applications. As a trusted China Manufacturer, we adhere to strict process controls to deliver consistent quality for global offshore energy projects.
Cold heading suits smaller bolts with low deformation resistance, while hot forging handles larger nuts requiring recrystallization temperature. Rolled UNJ/ACME bolt threads are matched with H2 tapped nuts, typically maintaining a 0.1P clearance. This balanced approach ensures both efficiency and performance, making this Bolt And Nut assembly a preferred choice for high‑strength fasteners in critical applications. As a trusted China Manufacturer, we adhere to strict process controls to deliver consistent quality for global offshore energy projects.
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