Carbon Steel British Thread Hollow Male Adapters BSP BSPT UNF Threads
I. Product Positioning & Core Value
Targeting cost-sensitive British-thread connection scenarios, this adapter integrates external thread fastening and hollow fluid passage functions. Manufactured from carbon steel (Q235/45#), it delivers high cost-effectiveness and superior strength for dry/low-corrosion environments (e.g., pipeline systems, hydraulic circuits in machinery), addressing economic connection needs for British-standard interfaces.
II. Detailed Specifications
1. Material & Surface Protection
- Base Material:
- Q235: General-purpose grade, cost-effective for low-pressure (≤80bar) and dry scenarios (e.g., agricultural machinery pipelines).
- 45# Steel: Quenched-tempered, with tensile strength ≥600MPa, suitable for high-pressure (≤200bar) and impact-prone scenarios (e.g., hydraulic joints in construction machinery).
- Surface Treatments (core protection, determining service life):
| Treatment | Appearance | Salt Spray Resistance | Applicable Scenarios | Limitations |
| Blue-white Zinc | Bright silver | 48–72 hours | Indoor dry environments (e.g., machine tools) | Prone to rust in humidity |
| Chromate Zinc | Rainbow hue | 72–120 hours | Mildly humid outdoors (e.g., agricultural machinery) | Weaker than dacromet |
| Black Oxide | Matte black | 24 hours | Lubricated indoor environments (e.g., oil circuits) | Rust-resistant only |
| Dacromet | Gray matte | ≥500 hours | Coastal/humid industrial areas | Higher cost, lower hardness |
2. Thread & Structural Design
- Thread Standards:
- Pipe Threads:
- BSPP (parallel, 55° thread angle, e.g., 1/2"-14 BSPP): For low-pressure water/gas (requires gaskets).
- BSPT (tapered, 55° thread angle, e.g., 3/8"-19 BSPT): Self-sealing for medium-pressure hydraulics.
- Fastening Thread: UNF (fine thread, 60° thread angle, e.g., 1/4"-28 UNF): For precision gas circuits (requires face seals).
- Hollow Design: The through-hole diameter matches thread specifications precisely (e.g., 1/2" thread → φ8.5mm through-hole). Roller-burnished inner walls eliminate burrs, ensuring smooth fluid flow (pressure drop ≤8%, vs. 15% for cut surfaces).
III. Application Scenarios & Industry Fit
| Industry | Typical Applications | Core Advantages | Media Restrictions |
| Construction Machinery | Hydraulic pipeline adapters for excavators, oil circuit joints for loaders | 45# steel resists impact; chromate zinc reduces cost | Mineral oil (neutral) |
| Agricultural Machinery | Air brake systems for tractors, water pipeline connections in irrigation equipment | Q235 offers cost-effectiveness; blue-white zinc suits short-term outdoor use | Freshwater, air |
| General Industry | Cooling water pipes for machine tools, interfaces for general pneumatic equipment | Black oxide suits lubricated environments; ultra-low cost | Emulsions (mildly alkaline) |
| Low-Pressure Fluids | Temporary water pipelines in construction, air circuits for small compressors | BSPT taper enables self-sealing (no gaskets needed for quick installation) | Clean water, non-corrosive gas |
IV. Selection & Installation Guide
1. Selection Parameters (Examples)
| Model Code | Thread Type | Carbon Steel Grade | Surface Treatment | Through-Hole Dia. (mm) | Rated Pressure (bar) | Suitable Media |
| HS-C1/2-BSPP | BSPP 1/2" | Q235 | Blue-white Zinc | 8.5 | 80 | Freshwater, air |
| HS-C3/8-BSPT | BSPT 3/8" | 45# | Dacromet | 6.2 | 180 | Hydraulic oil (dry) |
| HS-C1/4-28UNF | UNF 1/4" | Q235 | Black Oxide | 3.0 | 60 | Mineral oil (lubricated) |
V. Competitive Advantages
- Cost Leadership: 30–50% cheaper than stainless steel equivalents for mass industrial procurement.
- Strength Customization: Quenched 45# steel replaces some alloy steel joints, reducing cost while maintaining strength.
- Protection Flexibility: Choose surface treatments (blue-white zinc for cost, dacromet for durability) to balance cost and service life.
This carbon steel British-thread hollow male adapter focuses on "low cost + strong adaptability". Through tailored surface protection, it expands application boundaries, becoming the preferred British-standard connection solution for budget-sensitive fields (e.g., construction/agricultural machinery) in dry/low-corrosion environments, ensuring economical and reliable fluid transfer.
