4 Inch Cap – High‑Precision Metal Casting Solution for US Manufacturers
Your fast‑track to reliable, cost‑effective caps that meet ISO, CE & FDA standards.
Get Free Quote in 24 hThe Pain Points of Sourcing 4 Inch Caps
- 🔹 High price tags from limited suppliers – often 20‑30% above market.
- 🔹 Inconsistent quality leading to premature failure and costly downtime.
- 🔹 Long lead times (45‑90 days) that disrupt production schedules.
- 🔹 Lack of certification (CE, FDA, ISO) causing compliance risks.
- 🔹 Limited OEM/ODM flexibility for custom material or finish requirements.
According to a 2025 industry survey, 62% of US purchasing managers cited “supplier reliability” as the top barrier to scaling operations. Is your current cap supplier holding you back?
Explore a better solution →Why Our 4 Inch Caps Are the Smart Choice
Core Advantages
- Powerful Factory – 30,000 m² foundry in Hebei with 5,000 tons annual capacity.
- Quality Assurance – ISO 9001, CE, FDA, RoHS, and GS certifications on every batch.
- OEM/ODM Design – Material (cast iron, aluminum, stainless steel) & finish (machined, sand‑blasted, powder‑coat) fully customizable.
- High‑Speed Delivery – 7‑10 day shipment from China to US West Coast via air freight.
- Competitive Pricing – Up to 25% lower than North‑American equivalents without sacrificing quality.
Technical Specifications
| Parameter | Specification | Applicable Standards |
|---|---|---|
| Diameter | 4 in (101.6 mm) ±0.1 mm | ISO 2768‑m |
| Material Options | Cast Iron, Aluminum 6061‑T6, Stainless Steel 304/316 | ASTM A48, ASTM B209, ASTM A240 |
| Surface Finish | Machined ±0.03 mm, Powder‑coat (RAL 9005), Anodized | ISO 1302 |
| Pressure Rating | Up to 250 psi (1.7 MPa) | ASME B16.5 |
| Tolerance Class | Class IT6 (±0.05 mm) | ISO 286‑1 |
Application Scenarios & Case Studies
Our 4 inch caps are deployed in:
- Petrochemical pipe‑line terminations.
- Food‑grade processing equipment (FDA‑compliant stainless steel caps).
- Automotive hydraulic systems.
- Industrial water‑treatment plants.
Case Study – Midwest Water Solutions: Replaced their legacy caps with our custom‑machined aluminum caps, achieving a 37% reduction in maintenance cost and a 12‑day faster project rollout.
Request your tailored quote now →Trusted by Industry Leaders
Customer Testimonials
“Switching to YD’s 4 inch caps cut our component cost by 22% and the caps passed our FDA audit on the first try. Delivery was on‑time, every time.” – Mike Chen, Procurement Manager, Midwest Water Solutions
“The OEM design team helped us develop a powder‑coated stainless‑steel cap that meets our aesthetic and performance specs. Lead time dropped from 60 days to 9 days.” – Laura Patel, Technical Director, Delta Manufacturing
Certifications & Compliance
Our facilities hold:
- ISO 9001:2015
- CE & FCC (EMC)
- FDA 21 CFR Part 177 (Food‑Contact)
- RoHS & REACH
- GS (Germany), SAA (Australia)
- CB, VDE, IPPC, and other international standards
Frequently Asked Questions
1. Can I order custom material or finish for a 4 inch cap?
Yes. We support OEM/ODM designs with material choices (cast iron, aluminum, stainless steel) and surface finishes (machined, powder‑coat, anodized). Lead time for custom orders is typically 7‑10 days after design approval.
2. What is the minimum order quantity (MOQ) for a standard 4 inch cap?
Our standard MOQ is 500 pcs. For large‑volume projects we can reduce the MOQ to 200 pcs with a short‑run pricing model.
3. How do you ensure compliance with US regulations?
All caps are manufactured under ISO 9001 and undergo CE, FDA, RoHS, and GS testing. Test reports are provided with every shipment.
4. What shipping options are available to the United States?
We offer air freight (7‑10 days) and sea freight (30‑35 days). DDP (Delivered Duty Paid) is available for a hassle‑free experience.
5. What after‑sales support do you provide?
Our technical team is on‑call 24 h via WhatsApp, email, or phone. We provide free replacement for any non‑conformity within 12 months and a 30‑day money‑back guarantee on the first order.
Get Answers & Get a QuoteReady to Upgrade Your Supply Chain?
Limited‑Time Offer: First‑order discount of 10% for orders placed before May 31 2026 + free sample shipment.
Request Free SampleOr contact us instantly:
📞 Tel: +86‑311‑808‑126‑83 |
📱 WhatsApp: Ben / Linda
📧 Email: info@ydcastings.com
What Our Clients Say
- “The 4 inch caps arrived flawless, and the on‑site testing showed zero leaks. We saved $15 k on our last batch.” – James Liu, Operations Manager, Eco Water Co.
- “Y‑D’s engineering team turned our sketch into a production‑ready cap in 3 days. The speed is unmatched.” – Sara Gomez, Product Engineer, Global Automotive
- “Their ISO‑certified QA process gave us confidence to use the caps in a FDA‑regulated line. No audit issues.” – Mark Robinson, Quality Lead, ABC Energy
About the Author
Alex Chen – Senior Casting Engineer with 15 years of experience in metal‑casting solutions for the petrochemical and food‑processing sectors. Former lead technician at YD’s North‑China Foundry, certified ISO 9001 auditor, and frequent speaker at the International Foundry Expo.
Contact Alex directly via alex.chen@ydcastings.com for technical inquiries.
Your fast‑track to reliable, cost‑effective caps that meet ISO, CE & FDA standards. According to a 2025 industry survey, 62% of US purchasing managers cited “supplier reliability” as the top barrier to scaling operations.
