We specialize in high-precision CNC machining and custom threading services. Our capabilities cover a wide range of international standards, ensuring compatibility for global industrial applications. Whether you need Metric fasteners or North American pipe threads, our engineering team delivers tight-tolerance threads for critical sealing and mechanical assembly.
| Thread Type | Category | Full Name | Thread Angle | Taper | Key Characteristics & Common Applications |
| M | Metric | Metric General Purpose | 60° | None (Parallel) | Global standard. Defined by pitch (mm). Used for general mechanical fastening and assembly. |
| UNF | Unified | Unified Fine | 60° | None (Parallel) | Fine pitch for high strength and better adjustment. Common in aerospace and automotive industries. |
| UNEF | Unified | Unified Extra Fine | 60° | None (Parallel) | Extra fine pitch used for thin-walled tubes and high-precision adjustment instruments. |
| UNS | Unified | Unified Special | 60° | None (Parallel) | Customized threads with non-standard combinations of diameter and pitch for specific designs. |
| BSPP (G) | British | British Standard Pipe Parallel | 55° | None (Parallel) | Also known as G thread. Requires a washer, gasket, or O-ring to achieve a leak-proof seal. |
| BSPT (R/Rc) | British | British Standard Pipe Taper | 55° | 1:16 | Also known as Whitworth Taper. Achieves a seal via the fit of the threads themselves + sealant. |
| NPT | American | National Pipe Taper | 60° | 1:16 | Standard American pipe thread. Relies on thread interference and the use of PTFE tape or sealant. |
| NPTF | American | National Pipe Taper Fuel | 60° | 1:16 | Known as Dryseal. Designed to provide a leak-free seal without the need for additional sealants. |
Related topic:
What is Metric thread ?
What is UNF thread ?
what is BSP thread ?
what is Npt and Nptf thread ?
Common Questions
We are originial manufacturer provide oem cnc turning service and Located in Zhejiang, China, our facility is equipped with advanced CNC turning machines and precision inspection equipment to control both quality and cost from the source. .
We work with a wide range of metal materials to meet various industrial standards. Our major materials include carbon steel , stainless steel , aluminum , brass etc .
To send you an accurate quotation, please provide your 2D/3D technical drawings (in STEP, IGES, PDF, or CAD format) along with your estimated order quantity and material requirements. Usually, our engineering team will evaluate the details and provide a competitive quote within 24 hours.
Yes, we highly recommend prototyping and sample testing before placing bulk orders. We can provide custom pipe fittings samples according to your specifications to verify the dimensions, thread standards (such as NPT, BSP,Metric), and tolerances. Sample lead time is typically 10 working days.
As a custom pipe fittings supplier, our moq is 2000pcs .However, because CNC turning involves machine setup, programming, and tooling costs, larger order quantities will significantly lower the unit price. Please send us your project details, and we will find the most cost-effective production plan for you.
We have extensive experience in machining various international thread standards with perfect precision to ensure leak-free connections. Our production capabilities include:
Tapered Pipe Threads: NPT (American National Standard Pipe Thread) and BSPT (British Standard Pipe Taper / PT / R threads), widely used in high-pressure hydraulic systems.
Parallel/Straight Pipe Threads: BSPP (British Standard Pipe Parallel / G threads) and Metric parallel threads, ideal for plumbing and water manifold systems.
Machine & Bolt Threads: Metric (M) threads, UNC/UNF (Unified Coarse/Fine) threads, and BSW (British Standard Whitworth).
Every single batch of threaded fittings undergoes 99% inspection using professional Go/No-Go thread plug gauges and ring gauges to guarantee consistent pitch, depth, and a perfect seal for your industrial applications.
Yes. For every batch of production, we trace and provide the original raw material test reports (Mill Test Certificates) directly from our steel suppliers. Additionally, we use our in-house spectrometer for PMI (Positive Material Identification) testing before and during production to verify the exact chemical composition. We can supply both the supplier’s material certificates and our spectrometer test data upon request to ensure material compliance.
Yes, we do. Depending on your material and specification requirements, we can perform hardness testing and supply the corresponding reports. We routinely measure and certify hardness using standard scales such as Brinell (HB) or Rockwell (HRC), ensuring the fittings possess the exact structural integrity and machinability required for your application.
Yes. We offer high-precision laser marking services for custom branding, part numbers, size specifications, thread types (such as NPT or BSP), and batch tracking numbers. The laser engraving is crisp, permanent, and highly resistant to corrosion or wear, ensuring clear identification throughout the lifecycle of the fitting.
To prevent oxidation and extend the service life of carbon steel products, we provide several industrial-grade surface treatments, as follow is some normal surface treatment :
For stainless steel components, our surface treatments focus on maximizing corrosion resistance and achieving the desired surface roughness (Ra):
Pickling and Passivation: A chemical treatment that removes surface contaminants (like free iron) and restores the chromium oxide passive layer, drastically improving rust resistance.
Electropolishing: An electrochemical process that ultra-smooths the surface, reducing surface roughness (Ra), removing micro-burrs, and creating a high-gloss, pristine finish that prevents bacterial or chemical buildup.
Shot Blasting / Bead Blasting: Uses fine media to create a clean, uniform, non-reflective matte finish while masking minor machining lines.
Mechanical Polishing: Brushed or mirror-polished finishes tailored for architectural, food-grade, or sanitary application requirements.
We specialize in the manufacturing of precision machined custom cnc pipe fittings using a variety of materials including carbon steel, stainless steel, aluminum, and brass.
