304 316 Stainless Steel Double Ended Threaded Pipe NPT BSPS High Pressure Custom Length

304 316 Stainless Steel Double Ended Threaded Pipe NPT BSPS High-Pressure Custom Length

I. Core Structure and Technical Parameters

1. Basic Design

• Bidirectional Thread Structure: Both ends are processed with complete external threads (some models can be customized with internal threads), and the middle part is a smooth tubular main body, forming a full-bore design, suitable for fluid transmission or mechanical connection.
• Thread Standards:
  • British Threads: BSPT (tapered pipe threads), BSPP (parallel threads), compliant with ISO 7/1 standards, with excellent sealing performance, suitable for high-pressure scenarios.
  • American Standard Threads: NPT (tapered pipe threads), compliant with ASME B1.20.1, compatible with North American pipeline systems.
  • Metric Threads: M6-M100, with pitches of 1-6mm, supporting customization of special thread forms (e.g., trapezoidal threads) for non-standard requirements.

2. Materials and Performance

• Main Materials:
  • 304 Stainless Steel: Resistant to acid and alkali corrosion, with a salt spray test result of ≥1000 hours, suitable for food, pharmaceutical, and chemical equipment.
  • Carbon Steel (Q235B): Tensile strength ≥375MPa, with a galvanized (8-12μm) or nickel-plated (10-20μm) surface; neutral salt spray test shows no rust for 24 hours.
  • Copper Alloy (H62): Excellent thermal conductivity, suitable for refrigeration systems or weak current connections.
• Pressure Resistance Rating:
  • Stainless steel material: Regular models can withstand pressure ≤16MPa; thickened models can reach 40MPa (e.g., DN25 stainless steel threaded pipes).
  • Carbon steel material: Standard models can withstand pressure ≤10MPa; high-pressure models (wall thickness ≥6mm) can reach 25MPa.

3. Size Specifications

• Diameter Range: DN6 (1/8") to DN100 (4"), covering the full range from 1/8-inch to 4-inch pipes.
• Length Range: Regular in-stock lengths are 30-300mm; customization is supported for a maximum length of 2000mm (e.g., DN15×1000mm stainless steel threaded pipes).
• Precision Grade:
  • Ordinary grade: Thread pitch diameter tolerance ±0.05mm, suitable for general connections.
  • Precision grade: Grinding-level pitch diameter tolerance ±0.01mm, suitable for high-precision equipment (e.g., semiconductor production lines).

II. Core Advantages and Application Scenarios

1. Performance Advantages

• Dual Sealing Design:
  • Tapered threads combined with anaerobic adhesives (e.g., MXBON thread sealant) form a "mechanical engagement + chemical sealing" dual guarantee, with a leakage rate ≤0.01mL/min.
  • Some models have built-in O-rings (fluororubber or silicone), with pressure resistance ≥25MPa, suitable for dynamic vibration environments.
• Fatigue Resistance Characteristics:
  • Carbon steel materials undergo quenching and tempering (hardness HRC28-32), capable of withstanding more than 100,000 alternating loads (e.g., hydraulic systems).
  • Stainless steel materials undergo solution treatment, with tensile strength ≥520MPa, suitable for high-temperature (-200℃~+400℃) occasions.

2. Typical Applications

• Fluid Transmission Systems:
  • Chemical pipelines: 304 stainless steel threaded pipes connect reaction kettles and valves, resistant to strong acids and alkalis.
  • Refrigeration equipment: Copper alloy threaded pipes connect compressors and condensers, ensuring no refrigerant leakage.
  • Fire protection systems: Carbon steel galvanized threaded pipes are combined with grooved joints to quickly build sprinkler networks.
• Mechanical Fastening Fields:
  • Automobile manufacturing: Double-ended threaded pipes fix engine blocks and brackets, with a torque range of 80-350N·m.
  • Construction machinery: M30×300mm carbon steel threaded pipes connect tower crane standard sections, with a tensile load ≥800kN.
• Special Scenario Adaptation:
  • Medical equipment: 316L stainless steel threaded pipes connect CT machine slip rings, with a surface roughness of Ra≤0.8μm.
  • Aerospace: Titanium alloy threaded pipes (TC4) are used in aircraft hydraulic pipelines, featuring lightweight and resistance to extreme temperatures.