3 8 Threaded Cap – Premium Quality, Fast Delivery, Zero Risk
Designed for purchasing managers who demand reliable, cost‑effective caps that meet strict US regulations.
Get Free Quote in 24 hThe Real Cost of Low‑Quality Caps
- High price without performance: Generic caps often cost 15‑20% more per unit yet fail under pressure.
- Frequent leaks & re‑work: Poor threading leads to 2‑3% production downtime, costing up to $12,000 per month for a mid‑size plant.
- Regulatory non‑compliance: Caps lacking CE, FDA, or RoHS certification can halt shipments and trigger fines.
- Long lead times: Overseas suppliers average 45‑60 days, delaying your launch.
Why Our 3 8 Threaded Cap Beats the Competition
- Powerful Factory: 12,000 m² of CNC‑controlled casting lines in Hebei, China.
- Quality Assurance: ISO 9001, CE, FDA, RoHS, and GS certifications – full traceability.
- OEM/ODM Design: Custom thread pitch, material (cast iron, aluminum, stainless steel), and surface finish.
- High‑Speed Delivery: 7‑10 day air freight from Shanghai to Los Angeles; 15‑20 day sea freight to East Coast.
- Cost Transparency: FOB price $0.42/unit, 30 % lower than US‑based alternatives.
Technical Specification Sheet
| Parameter | Specification | Compliance |
|---|---|---|
| Thread Size | 3 8 in (0.375 in) – M8×1.25 | ISO 228‑1 |
| Material | Cast Iron / Aluminum 6061‑T6 / Stainless Steel 304 | ASTM A536 / ASTM B221 / ASTM A240 |
| Hardness (HB) | 180‑220 (Cast Iron) | ISO 6507‑1 |
| Surface Finish | Rz ≤ 0.8 µm (machined) / Powder‑coat (optional) | ISO 1302 |
| Tolerance | ±0.02 mm (major dia.) | ISO 286‑1 |
| Pressure Rating | Up to 10 bar (continuous) | ASME B16.5 |
Application Scenarios
- Food‑processing equipment – meets FDA & HACCP standards.
- Automotive fluid lines – corrosion‑resistant stainless‑steel options.
- Pharmaceutical packaging – validated for GMP environments.
- Industrial pneumatic systems – high‑pressure tolerance.
2-inch-threaded-cap 3-4-inch-cap
Trusted By Industry Leaders
“Switching to YD’s 3 8 threaded caps cut our line‑stop time by 37% and saved $18,000 in the first quarter. Their ISO‑9001 process gave us confidence for FDA‑regulated products.” – James Liu, Operations Manager, FreshPack USA
Certificates: ISO 9001, CE, FDA, RoHS, GS, CB, VDE, SAA, HACCP/GMP, IPPC
Frequently Asked Questions
What minimum order quantity (MOQ) do you accept?
Our standard MOQ is 5,000 pcs. For OEM/ODM projects we can lower it to 2,000 pcs with a 10 % surcharge.
Can you produce custom thread profiles?
Yes. Our engineering team can design non‑standard pitches, tapered threads, or add sealing inserts. CAD files are provided for approval before casting.
What are the payment terms for US buyers?
30 % T/T deposit, 70 % balance before shipment. For trusted partners we offer L/C at sight or Net‑30 after delivery.
How do you handle after‑sales service and warranty?
One‑year limited warranty covering material defects. Our US liaison office handles RMA logistics within 48 hours of claim.
Do you ship to the continental US directly?
Yes. We partner with UPS, FedEx, and DHL for air freight, and with Maersk for LCL sea freight. Door‑to‑door tracking is provided.
Ready to Upgrade Your Supply Chain?
Limited‑time offer: **Free sample set** (up to 100 pcs) + **30‑day money‑back guarantee**.
Request Sample Email Quote NowOr WhatsApp us directly: +86 1933 3738 338 (Ben) / +86 1933 3736 198 (Linda)
What Our Customers Say
- Emily Chen, Purchasing Manager, GreenTech Corp. – “The 3 8 caps arrived in 8 days, fully certified, and performed flawlessly. Our audit passed with zero comments.”
- Mark Davis, Senior Engineer, AeroParts USA. – “Custom alloy option saved us 22 % on material cost while meeting ASME pressure standards.”
- Linda Wu, Supply Chain Lead, MedSupply Inc. – “Y‑D’s after‑sales response was under 24 hours. The replacement caps were shipped the same day – impressive reliability.”
About the Author
Alex Li, Senior Foundry Engineer
With 15 years of experience in metal casting for automotive and food‑processing sectors, Alex leads YD’s OEM/ODM engineering team. He holds a Master’s in Materials Engineering (Tsinghua University) and is a certified ISO 9001 auditor.
Contact: alex.li@ydcastings.com
Hebei Yuanda Trade Co., Ltd. | No.563 Xinhua Road, Shijiazhuang City, Hebei Province, P.R. China
Tel: +86‑311‑808‑126‑83 | WhatsApp: +86 1933 3738 338 (Ben) / +86 1933 3736 198 (Linda) | Email: info@ydcastings.com
All product data complies with US regulations (FDA, FCC, OSHA). Privacy policy available on our website.
Designed for purchasing managers who demand reliable, cost‑effective caps that meet strict US regulations. Discover how we eliminate these risks → 2-inch-threaded-cap 3-4-inch-cap Get your custom quote now → Certificates: ISO 9001, CE, FDA,
