As an OEM/ODM manufacturer specializing in precision CNC turned and forged components, we supply custom 304 stainless steel pipe fittings and 316 ss pipe fittings tailored to your engineering drawings. To help buyers and engineers select the optimal grade for corrosion resistance and production cost, the comparison below outlines their key metallurgical and performance differences:
| Engineering Factor | 304 / 304L SS Pipe Fittings | 316 / 316L SS Pipe Fittings |
| Material Grade | AISI 304 / 304L (UNS S30400 / S30403) | AISI 316 / 316L (UNS S31600 / S31603) |
| Chemical Composition | 18% Cr, 8% Ni | 16–18% Cr, 10–14% Ni, 2.0–3.0% Molybdenum (Mo) |
| Corrosion Resistance | Excellent for freshwater, indoor lines, and mild chemicals. | Superior resistance to chlorides, salt spray, marine environments, and acidic media. |
| Pitting Resistance (PREN) | Moderate (~18–20) | High (~23–25) due to Molybdenum addition. |
| Machinability & Tooling | High machinability with standard carbide inserts. | Higher work-hardening tendency; machined with specialized PVD-coated tools. |
| Cost Efficiency | Highly cost-effective for general industrial applications. | Higher raw material cost; recommended where chemical integrity is critical. |
| Common Applications | General plumbing, pneumatic fluid lines, non-corrosive industrial equipment. | Marine hardware, offshore oil & gas, chemical processing lines, high-purity fluid transfer. |
Engineering Selection Recommendations:
Choose 304 SS Pipe Fittings for general indoor industrial fluid lines, pneumatic components, and standard machinery where structural strength and cost-efficiency are paramount.
Specify 316 SS Pipe Fittings whenever your system operates in coastal, marine, or chemical processing environments that demand zero tolerance for chloride pitting or aggressive media attack.
Material Traceability: All our 304 and 316 stainless steel pipe fittings are supplied with complete raw material traceability and Material Test Reports (MTR) upon request.
| Category | Customization Details & Range |
| Product Types | Forged Pipe Fittings: Adapters, Connectors, Plugs, Bushings, Unions, Pneumatic Fittings, Garden Gas Fittings, hex nuts , and Custom CNC Turned Components and other carbon steel pipe fittings and stainless steel pipe fittings with CAD/STEP drawings. |
| Manufacturing Processes | Hot Forging / Red Punching: Eliminates internal porosity and enhances high-pressure resistance. Cold Heading: Ideal for high-speed, cost-effective mass production. Precision CNC Machining: Secondary processing for ultra-tight tolerances. |
| Carbon Steel Material | 1020, 1045, 12L14, 1215, Q235B, 42crmo etc. (High strength and excellent machinability). |
| Stainless Steel Material | 201,304, 316, 316L, 303, etc. (For superior corrosion resistance and high-hygiene environments). |
| Other Materials | Brass, Copper, Aluminum, and specialized custom alloys upon request. |
| Precision / Tolerance | Standard Tolerance:±0.02mm |
| Thread Standards | NPT, NPTF, BSPP (G), BSPT (R/RP), Metric (M), UNF, UNEF, etc. (99% verified by Go/No-Go gauges). |
| Surface Treatment | Electroless Nickel Plating, Zinc Plating (Clear/Yellow), Passivation, Anodizing, Black Oxide, Heat treatment , Chrome plated,Dacromet,etcs. |
| Quality Control | Salt Spray Testing, Hardness Testing, Full Dimensional Inspection, and Material Test Reports (MTR). |
| Production Capacity | Equipped with 60 sets of precision CNC Lathes integrated with Automated Truss Robots . |
| MOQ & Lead Time | Moq 2000pcs . |
With over 9 years of specialized experience in the pipe fitting and precision hardware sector, we excel at transforming complex technical drawings into high-performance CNC components. Our facility operates 60 sets of advanced CNC lathe machines, allowing us to bridge the gap between rapid prototyping and large-scale wholesale production without compromising on lead times.
Why global buyers choose Hongqian Machinery:
Zero-Defect Threading: 99% percent pipe fitting is verified with Go/No-Go gauges to ensure perfect fitment.
Precision Tolerances: We achieve tight tolerances up to ±0.02mm with high cnc machinery service, meeting the most demanding technical specifications.
Technical Consultation: Our engineering team provides insights to optimize your designs for better manufacturability and cost-efficiency.
To preserve the zinc-plated surface and prevent any scratches or thread damage during transit, we offer flexible, multi-layer packaging solutions customized to your specific order requirements:
Inner Protection: Components are safely packed using either protective polybags or custom blister trays (vacuum-formed trays) to isolate the parts and eliminate metal-to-metal friction.
Outer Boxing: All internally protected parts are packed into heavy-duty, double-wall corrugated master export cartons.
Palletization or Wooden Crating: Depending on the shipping method and volume, cartons are securely stacked on sturdy export pallets or loaded into heavy-duty wooden cases, wrapped in waterproof stretch film, and reinforced with industrial strapping for safe maritime transit.
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.
