In high-pressure fluid power and heavy hydraulic engineering, the SAE Blind Flange serves as an indispensable solid seal component designed to isolate hydraulic distribution manifolds, block secondary fluid lines, and provide leak-tight maintenance access points. Governed globally by SAE J518 and ISO 6162 international standards, these specialized blind flanges differ significantly from conventional pipe flanges such as ASME B16.5 or EN 1092-1.
Unlike standard pipe blind flanges that rely on raised faces and flat full-face gaskets, SAE blind flanges feature a four-bolt split-flange clamp interface integrated with a precision-machined elastomeric O-ring groove. This design distributes mechanical clamping loads evenly across four high-tensile socket-head cap screws, virtually eliminating flange deflection under severe dynamic pressure surges.
Engineered for extreme operating environments, SAE blind flanges are classified into two primary pressure ratings:
The operational reliability of a discount SAE blind flange depends directly on the grain structure achieved during hot forging. At Shanxi Yuxin Casting & Forging Co., Ltd. (est. 1992), every SAE blind flange is forged from fully killed carbon steel, alloy steel, or high-grade stainless steel to ensure zero internal porosity and maximum tensile strength.
Key metallurgical options include:
Located in Dingxiang County, Shanxi Province—officially recognized as the “Hometown of Forging in China”—Shanxi Yuxin operates within a fully integrated industrial ecosystem. Raw steel billet sourcing, mold forging, heat treatment furnaces, precision CNC machining, and surface treatment are concentrated within a 15-kilometer radius. This geographic concentration drastically lowers logistical overhead and energy costs, allowing us to pass on substantial factory discounts to global distributors and OEMs.
Yuxin maintains an annual production capacity exceeding 10,000 metric tons of industrial flanges and forged rings. Utilizing closed-die forging presses, automated ring-rolling machines, and multi-axis CNC machining centers, we achieve zero scrap waste and exceptional dimensional repeatability. When international buyers purchase "Discount SAE Blind Flanges" from Yuxin, the price reduction reflects raw manufacturing efficiency, high-volume production runs, and direct factory sales—never a compromise on metallurgical quality.
From initial billet cutting to final anti-corrosion packaging, every phase of production occurs inside our owned facility. Every single flange is stamped with a unique heat identification number mapped directly to its chemical breakdown and mechanical test certificate. This eliminate middleman risk, guaranteeing that the steel composition in your hands matches the EN 10204 3.1 Mill Test Certificate verbatim.
| SAE Flange Class | Nominal Size (Inches / DN) | Working Pressure (PSI / Bar) | Standard Bolt Hole Thread / Size | O-Ring Groove Outer Diameter | Recommended Fastener Grade |
|---|---|---|---|---|---|
| Code 61 (ISO 6162-1) | 1/2" (DN 13) | 3,000 PSI / 210 Bar | M8 x 1.25 / 5/16"-18 UNC | 25.40 mm (1.000 in) | Metric Grade 10.9 / SAE Grade 8 |
| Code 61 (ISO 6162-1) | 1" (DN 25) | 3,000 PSI / 210 Bar | M10 x 1.50 / 3/8"-16 UNC | 39.70 mm (1.563 in) | Metric Grade 10.9 / SAE Grade 8 |
| Code 61 (ISO 6162-1) | 2" (DN 51) | 3,000 PSI / 210 Bar | M12 x 1.75 / 1/2"-13 UNC | 63.50 mm (2.500 in) | Metric Grade 10.9 / SAE Grade 8 |
| Code 62 (ISO 6162-2) | 3/4" (DN 19) | 6,000 PSI / 420 Bar | M10 x 1.50 / 3/8"-16 UNC | 31.80 mm (1.252 in) | Metric Grade 12.9 / SAE Grade 8 |
| Code 62 (ISO 6162-2) | 1-1/4" (DN 32) | 6,000 PSI / 420 Bar | M14 x 2.00 / 1/2"-13 UNC | 44.50 mm (1.752 in) | Metric Grade 12.9 / SAE Grade 8 |
| Code 62 (ISO 6162-2) | 2" (DN 51) | 6,000 PSI / 420 Bar | M20 x 2.50 / 3/4"-10 UNC | 69.80 mm (2.748 in) | Metric Grade 12.9 / SAE Grade 8 |
Procuring discount SAE blind flanges for critical infrastructure projects requires strict verification of international standards. Yuxin holds an extensive portfolio of audited quality certifications tailored for European, American, Middle Eastern, and Asian markets:
To withstand prolonged ocean freight and high-humidity tropical storage, Yuxin executes rigorous multi-layer packaging protocols for all export shipments:
Installed on subsea BOP (Blowout Preventer) hydraulic control units, marine winches, and jack-up rig jacking systems where saltwater corrosion resistance and Code 62 6,000 PSI sealing are mandatory.
Employed by OEM machinery manufacturers to cap auxiliary hydraulic valve blocks, main pump discharge ports, and hydrostatic drive circuits on heavy hydraulic excavators and mining trucks.
Used to temporarily blank high-pressure solvent injection headers and fluid cracking loop lines during plant turnarounds and scheduled pressure testing cycles.
Fitted on high-tonnage hydraulic forging press manifolds operating under continuous pulse cyclic pressures, providing zero-maintenance dead-end seals.
Modern SAE blind flange manufacturing integrates AI visual inspection algorithms directly onto 5-axis CNC machining centers. Real-time laser profilometry measures O-ring groove depth, surface roughness (Ra 1.6–3.2 μm), and bolt hole concentricity down to 0.01 mm tolerances, virtually eliminating human error.
Moving beyond conventional cadmium or hexavalent chrome coatings, industry demand has shifted toward eco-friendly Zinc-Nickel (Zn-Ni) alloy plating. Providing over 1,000 hours of neutral salt spray (NSS) test performance without red rust, Zn-Ni coated SAE blind flanges are standard for severe offshore applications.
Yuxin is actively reducing embedded carbon across our forging lines by transitioning from coal-fired preheating to clean natural gas and electric induction furnaces. Green manufacturing initiatives help global enterprise buyers satisfy Scope 3 supply chain decarbonization benchmarks.
Code 61 (ISO 6162-1) is rated for standard working pressures up to 3,000 PSI (210 to 345 bar depending on size), whereas Code 62 (ISO 6162-2) is designed for high-pressure systems up to 6,000 PSI (420 bar). Code 62 flanges feature thicker body dimensions, larger bolt circle diameters, and heavier socket-head cap screws to withstand severe hydraulic pressure spikes and shock loads.
Our discount pricing stems from structural economic advantages: location in Dingxiang (China's forging hub), direct steel mill billet procurement, high-volume automated forging, and zero middleman trading margins. Every flange undergoes 100% inspection and ships with EN 10204 3.1 certification backing its material properties.
We supply high-grade elastomeric O-rings tailored to your fluid medium and operating temperature range: NBR (Nitrile, 90 Shore A) for standard mineral oils (-30°C to +100°C), FKM/Viton for high temperatures and aggressive synthetic chemicals (-20°C to +200°C), and EPDM for phosphate ester hydraulic fluids.
Yes. In addition to standard SAE J518, ASME B16.5, EN 1092-1, and DIN flanges, our engineering team reverse-engineers or produces bespoke forged components up to 3,000 mm (120 inches) outer diameter directly from your DWG, STEP, or PDF engineering drawings.
Standard carbon steel sizes held in rough-forged stock can be machined and dispatched within 7 to 15 days. Custom forged-to-order alloys require 20 to 35 days. We offer flexible MOQs to support initial sample trials and stock replenishment for international stocking distributors.
