SS Threaded Flange (NPT/BSP)
High-Quality Threaded Connection Flanges for Industrial Piping Systems
SSM manufactures precision stainless steel threaded flanges in both NPT (National Pipe Thread) and BSP (British Standard Pipe) thread standards. Our SS threaded flanges are ideal for low-pressure piping systems, instrument connections, and maintenance-friendly installations where welding isn't practical.
Threaded Flange Specifications
1. Standard Dimensions & Thread Types
| Thread Standard | Size Range | Pressure Class | Flange Type |
|---|---|---|---|
| NPT (ASME B1.20.1) | 1/2" - 4" | 150# - 600# | Slip-On, Weld Neck |
| BSP (ISO 7/ISO 228) | DN15 - DN100 | PN10 - PN40 | Slip-On, Weld Neck |
| Thread Details | Tolerance | Thread Angle | TPI/Pitch |
| NPT | ASME B1.20.1 | 60° taper | 11.5-8 TPI |
| BSPT (tapered) | ISO 7 | 55° taper | 11-28 TPI |
| BSPP (parallel) | ISO 228 | 55° straight | 11-28 TPI |
2. Material Specifications
| Grade | ASTM Standard | Thread Compatibility | Max Pressure (PSI) |
|---|---|---|---|
| 304 | A182 F304 | NPT/BSP | 1500 (NPT), 1000 (BSP) |
| 316 | A182 F316 | NPT/BSP | 1500 (NPT), 1000 (BSP) |
| 316L | A182 F316L | NPT/BSP | 1200 (NPT), 800 (BSP) |
3. Pressure-Temperature Ratings
| Thread Type | Seal Method | Max Temp (°C) | Pressure Derating Factor |
|---|---|---|---|
| NPT | Thread sealant | 200 | 0.7 @ 150°C |
| BSPT | Thread sealant | 180 | 0.6 @ 150°C |
| BSPP | O-ring/gasket | 150 | 0.5 @ 120°C |
Manufacturing & Quality Assurance
Production Process
Precision Threading - CNC thread cutting machines
Surface Finishing - Deburring and thread polishing
Leak Testing - Air pressure test @ 1.5x rated pressure
Thread Gauging - 100% thread verification
Quality Control
Thread Pitch Verification - Plug/ring gauges
Material Certification - EN 10204 3.1
Dimensional Inspection - Per ASME/ISO standards
Surface Inspection - Visual and dye penetrant
Technical Advantages
✔ Leak-Free Connections - Precision-cut threads ensure tight seals
✔ Maintenance-Friendly - Easy disassembly without cutting
✔ Corrosion Resistance - Stainless steel construction
✔ Dual-Standard Options - NPT/BSP available
Available Configurations
Standard Options
NPT Threaded - ASME B1.20.1 compliant
BSP Threaded - ISO 7/ISO 228 compliant
Hexagonal Boss - For wrench tightening
Counterbored - For O-ring seals
Special Features
Teflon-Seated - For chemical resistance
Extended Neck - For better thread engagement
Insulating Kits - For electrical isolation
Why Choose SSM Threaded Flanges?
• Precision Threading - Guaranteed proper engagement
• Full Material Traceability - Mill test certificates
• Competitive Pricing - Direct manufacturer rates
• Global Certifications - PED, ASME, ISO 9001
• Technical Support - Thread selection guidance
Request Your Quote Today
Our engineering team provides:
Thread standard selection
Pressure rating calculations
Material recommendations
Application-specific solutions
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