21.5 mm End Cap – High‑Precision, OEM‑Ready Solution for Industrial Manufacturers
For Purchasing Managers, Technical Directors & Operations Leaders who wrestle with high‑price, low‑quality caps, our 21.5 mm end cap delivers exceptional durability at 30 % lower total cost.
Get Free Quote in 24 hThe Real Cost of Sub‑Standard End Caps
- High Price, Low ROI: Over‑priced caps increase BOM by up to 12 %.
- Frequent Failures: 18 % of OEMs report cracks within 6 months, causing production downtime.
- Inconsistent Tolerances: ±0.15 mm variance leads to sealing leaks and warranty claims.
- Long Lead Times: Traditional suppliers average 45 days, slowing time‑to‑market.
Why Our 21.5 mm End Cap Stands Out
Core Advantages
- Precision Casting: ±0.05 mm tolerance using CNC‑controlled sand casting.
- Material Flexibility: Cast iron, aluminum, stainless steel – all ISO‑9001 certified.
- OEM/ODM Design Support: CAD‑to‑production in 7 days.
- Fast Delivery: 10‑day standard shipping from Hebei’s high‑speed logistics hub.
- Cost Transparency: FOB pricing with no hidden fees; volume discounts from 500 pcs.
Technical Specification
| Parameter | Specification |
|---|---|
| Diameter | 21.5 mm ±0.05 mm |
| Material | Cast Iron / Aluminum 6061‑T6 / Stainless Steel 304 |
| Hardness (HB) | 180‑220 (Cast Iron) / 150‑180 (Aluminum) |
| Surface Finish | Ra ≤ 0.8 µm |
| Weight (per piece) | 12‑18 g (depends on material) |
| Compliance | CE, ISO 9001, RoHS, FCC, GS |
Application Scenarios
Our 21.5 mm end caps are ideal for:
- Automotive hydraulic cylinders
- Industrial pneumatic actuators
- Medical device housings
- Robotics joint assemblies
- Custom machinery sealing solutions
Frequently Asked Questions
Can you provide a custom material for the 21.5 mm end cap?
Yes. We offer cast iron, aluminum 6061‑T6, and stainless steel 304. Our engineering team can advise on the best material for your application.
What is the minimum order quantity (MOQ)?
MOQ is 500 pieces. For larger volumes we offer tiered discounts up to 15 %.
How long does it take to receive a sample?
Free samples are shipped within 3 business days after order confirmation; delivery to the US typically takes 5‑7 days.
Do you support OEM design services?
Absolutely. Our R&D team works with your CAD files, provides DFMEA analysis, and delivers prototype within 7 days.
What logistics options are available for the USA?
We offer FOB Hebei, DDP (door‑to‑door), and air‑freight express. All shipments are insured and tracked.
Ready to Upgrade Your Production Line?
Limited stock of premium‑grade caps – order within 48 hours to lock in the 2026 price and receive a free engineering sample.
Email Quote Now WhatsApp BenOr call us at +86‑311‑808‑126‑83 for immediate assistance.
What Real Users Say
- "The 21.5 mm caps fit perfectly on our hydraulic pistons – zero re‑work needed." – Mark L., Senior Engineer, HydroFlow Inc.
- "Delivery was on time, and the quality exceeded our ISO‑9001 audit expectations." – Emily R., Procurement Lead, MedTech Solutions
- "Competitive pricing allowed us to reduce our BOM by 8 % without compromising durability." – David K., Operations Manager, AutoMotive Parts Co.
About the Author
James Liu, Senior Foundry Engineer – Hebei Yuanda Trade Co., Ltd.
With over 15 years in precision metal casting, James has led OEM projects for Fortune‑500 automotive and medical manufacturers. He holds a Master’s in Materials Engineering and is a certified ISO 9001 internal auditor.
Contact: info@ydcastings.com | Contact Page
For Purchasing Managers, Technical Directors & Operations Leaders who wrestle with high‑price, low‑quality caps, our 21.5 mm end cap delivers exceptional durability at 30 % lower total cost . Discover the solution → Our
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Certificates: CE, ISO 9001, RoHS, FCC, GS, CB, VDE, SAA, HACCP/GMP, IPPC.