Round Edge Flange Nut
Product Details
Zhejiang Leadtek Fluid Technology Co., Ltd. is one of the most experienced manufacturers and suppliers of round edge flange nut in China. Please feel free to buy customized round edge flange nut at competitive price from our factory. Also, free sample is available.
Product Introduction
Round Edge Flange Nut - a hex locking nut with an integrated bearing flange and smooth rounded perimeter, engineered for installations where surface contact stress must be distributed and sharp edges would damage seals, coatings, or adjacent components. Manufactured from SS304 or SS316 stainless steel, it provides reliable corrosion resistance for water systems, industrial fluid piping, and general mechanical assemblies. Available in 7 sizes from ⅜" to 2", with all dimensions tolerance-controlled to L-0.6mm for consistent fit across mating components.
Dimensional Specifications
| Size | DN | ØD (mm) | L (mm) | SW (mm) |
|---|---|---|---|---|
| ⅜" | 10 | 28 | 8.5 | 21 |
| ½" | 15 | 32 | 9 | 25 |
| ¾" | 20 | 38 | 10.5 | 31 |
| 1" | 25 | 45 | 11 | 38 |
| 1¼" | 32 | 53 | 11.5 | 46 |
| 1½" | 40 | 60 | 13 | 53 |
| 2" | 50 | 74 | 14 | 66 |
Tolerance: ⅜"–2", L-0.6mm
| Parameter | Details |
|---|---|
| Material | SS304 / SS316 (available) |
| Size Range | ⅜" – 2" (DN10–DN50) |
| Dimensional Tolerance | L-0.6mm |
| Surface | Precision machined |
| Thread Type | BSP (ISO 228) |
Key Features
Rounded flange edge - surface protection by design
The smooth outer perimeter of this Hex Flange Nut with Rounded Edge prevents scoring on gaskets, valve bodies, and coated surfaces during torque application - eliminating a common installation defect in stainless steel pipework.
01
Integrated flange for load distribution
The bearing flange spreads clamping force across a wider contact area, reducing point loading on soft seating materials and maintaining joint integrity under vibration or thermal cycling.
02
Dual material grade
SS304 covers standard water, air, and industrial fluid service. SS316 adds molybdenum for resistance to chlorides and corrosive media - specify the grade that matches your system environment.
03
Low-profile geometry
The compact flange height (L 8.5–14mm across the range) suits installations with restricted wrench clearance while maintaining the full SW across-flats dimension for reliable torque transfer.
04
Consistent dimensional tolerance
L-0.6mm tolerance across all 7 sizes ensures predictable stack-up in multi-component assemblies without hand-fitting or selective matching.
05
Applications
This Rounded Hex Flange Nut is widely used in:
- Industrial pipe systems - locking threaded joints on valves, fittings, and instrumentation connections
- Fluid control assemblies - securing unions and end connections where gasket face protection is required
- Food & beverage processing - SS316 grade for corrosion resistance in wet and washdown environments
- Petrochemical & energy - corrosion-resistant fastening in aggressive media service
- HVAC & fire protection - reliable locking in threaded pipework subject to vibration and pressure cycling
Quality Control
Every Round Edge Flange Nut leaving Leadtek's facility passes through a multi-stage inspection process before shipment. Dimensional verification confirms ØD, L, and SW values against drawing tolerances - L-0.6mm across the full ⅜"–2" range - using calibrated gauges from our in-house testing laboratory equipped with 20+ specialized instruments. Material grade is confirmed at the incoming stage to ensure SS304 and SS316 stock is not mixed across production batches.
Surface condition is checked after CNC machining for burrs, tool marks, or edge irregularities that would affect the rounded flange profile - the defining functional feature of this component. Thread integrity is verified prior to final packaging.
All production and inspection procedures run under our ISO 9001 quality management system, with ISO 14001 environmental controls applied across the facility. CE and KC certifications cover the product range for European and Korean market compliance.
For orders requiring material traceability documentation or third-party inspection, contact us at the inquiry stage to arrange accordingly.
Why Source from Leadtek
Leadtek is a vertically integrated manufacturer - casting, CNC machining, assembly, and QC testing all under one roof at our 37,000㎡ facility in Zhejiang, China. With 30+ years of precision casting experience and 400+ production machines, dimensional consistency is built into the process.
Our full stainless steel fitting range, including customized Round Edge Flange Nut solutions, is produced under ISO 9001 and ISO 14001 quality management systems. We hold CE, KC, and TS certifications - directly supporting import compliance across Europe, Korea, and global markets. Products are exported to 80+ countries across Europe, North America, Asia-Pacific, and the Middle East.
OEM orders with custom dimensions, material grades, or branding are supported. Contact us with your drawing or specification.
Frequently Asked Questions
Q: When should I choose SS316 over SS304 for this nut?
A: SS316 contains added molybdenum, which significantly improves resistance to chlorides, saltwater, and acidic media. If your system handles aggressive chemicals, operates in a marine or coastal environment, or involves food-grade washdown, SS316 is the recommended grade. SS304 is suitable for standard water, air, and general industrial service.
Q: What does the rounded edge design prevent compared to a standard hex nut?
A: A sharp-edged hex nut can score valve body seats, damage PTFE or rubber gasket faces, and scratch coated pipe surfaces during installation. The rounded flange perimeter eliminates this risk, which is particularly relevant in SS pipe systems where surface condition affects long-term joint integrity.
Q: How do I select the correct size?
A: Match the Size (⅜" to 2") to your pipe nominal bore (DN10–DN50). The dimensional table provides ØD, L, and SW for each size to verify compatibility with your counter-bore and wrench clearance.
Q: What is the lead time for standard and custom orders?
A: Standard catalog sizes are available for prompt shipment. Custom OEM orders - including non-standard dimensions or branding - generally require 2–4 weeks from drawing confirmation depending on quantity. Contact us for a project-specific timeline.
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