20211 GB Metric Female Flat Seat
Product Description Product name: Metric Barbed Hose Fittings/Metric Flat Seal (20211/20212) 1. Raw Material: Carbon Steel & Stainless S...
Product Description Product name: Metric Barbed Hose Fittings/Metric Flat Seal (20211/20212) 1. Raw Material: Carbon Steel & Stainless S...
1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...
Product Description Product name: 90° Metric Female Flat Seal Hydraulic Hose Fitting (20291, 20291T) 1. Raw Material: Carbon Steel & Stai...
1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...
Product Description Product name: Metric Female 24° Cone O-Ring L. T. Stainless Steel Pipe Fitting (20411) 1. Raw Material: Carbon Steel ...
1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...
1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...
Product Description Product name: Hydraulic Hose Couplings (20491) 1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard P...
1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...
1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...
1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...
1. Raw Material: Carbon Steel & Stainless Steel available 2. Standard Plating: Trivalent Zinc Plating ( Cr3 / Chrome Free ), Silver & Yellow ...
Our 10 years of customisation experience has created the OPK Fitting brand value.




あなたの手にはすでに違いがわかります。JIC オス継手は JIC メススイベルにスムーズにねじ込まれ、金属間 37 度のフレアで取り付けられます。同じオスを NPT ポートに挿入しようとすると、ねじ山が固着したり、漏れたり、損傷したりします。この短いテストは、JIC 油圧継手が人気があると同時に誤解されている理由を示しています。 JIC は Joint Industry Council の略で、形状は SAE J514 で定義されています: 平行な UNF ねじと 37° フレアシール面。油圧ホースを注文または組み立てるときは、ネジの直径だけでなく、ダッシュボードのサイズとシート角...
View MoreSuppose a newly delivered hose assembly threads onto the pump port for three turns and then binds. Forcing it a little more creates a connection that looks right but leaks as soon as the system reaches operating pressure. In field service, mismatched hydraulic fitting threads cause leaks, stri...
View MoreA hydraulic hose bursts on an excavator arm at mid-morning. The spare fitting in the toolbox looks exactly like the damaged one, but it will not thread on. Identifying hydraulic fittings correctly is what separates a 20-minute repair from a half-day hunt for the right adapter. ほとんどの油圧継手は...
View MoreA standard hose fitting is a critical connector used in hydraulic systems to securely join hoses with other components such as pumps, valves, and cylinders. These fittings ensure a tight seal and efficient fluid transmission under high pressure, often exceeding 3,000 PSI . A reliable fitting can significantly reduce leakage risks and improve system efficiency by up to 15% .
Standard hose fittings are widely used across industries including construction, agriculture, and manufacturing, where durability and reliability are essential.
Our fittings are available in carbon steel and stainless steel . Carbon steel is suitable for general applications, while stainless steel is ideal for environments requiring high corrosion resistance, such as marine or chemical industries.
We use trivalent zinc plating (Cr3, chrome-free) with silver and yellow finishes. This eco-friendly coating enhances corrosion resistance while meeting environmental standards.
Our fittings pass a salt spray test of over 72 hours , and can reach up to 200 hours upon request, ensuring long-term durability in harsh environments.
Each product is protected with plastic caps and packed in carbon boxes to prevent damage during transportation and storage.
| Material | Corrosion Resistance | Application |
|---|---|---|
| Carbon Steel | Medium | General hydraulic systems |
| Stainless Steel | High | Marine and chemical industries |
About OPK Fitting
OPK FITTING Hydraulic Equipment Factory is a specialized domestic factory with hydraulic pipes and adaptors production experience. Our managing scope relates to various fields such as hydraulic systems etc.; Including all kinds of materials with different pressure levels, flexible hydraulic hoses with various size criteria, hose fitting, adaptor, etc.
They have been respectively applied in the hydraulic and fluid conveyance systems of industries, such as machinery, metallurgy petroleum, construction, ships, space-flight, agriculture, pharmaceutical, food, and so forth.
We provide OEM services where customers only need to provide drawings or samples. In addition, free samples are available to help customers evaluate product quality before mass production.
With proper material selection and maintenance, hose fittings can last 3–5 years or longer depending on working conditions.
Yes, we offer OEM customization based on customer drawings or samples to meet specific application requirements.
Yes, we provide free samples . Please contact our sales team to request samples and evaluate product quality.