For procurement managers, piping engineers, and operations teams sourcing flanges for critical pipeline infrastructure: this guide delivers ASME B16.5 compliant slip-on flange weights in kilograms, material density factors, and cost-saving procurement insights — from a manufacturer with 20+ export markets.
🏭 ISO 9001 Certified Manufacturer | Cangzhou Weihuan Pipeline Equipment Co., Ltd.
For procurement managers, piping engineers, and operations teams sourcing flanges for critical pipeline infrastructure: this guide delivers ASME B16.5 compliant slip-on flange weights in kilograms, material density factors, and cost-saving procurement insights — from a manufacturer with 20+ export markets.
The hidden costs of inaccurate flange weight data are larger than you think.
International shipping of flanges is charged by actual weight or volumetric weight. A 10% error in flange weight estimation can add $2,000–$8,000 to a 40ft container shipment from China to the US. Procurement teams using inaccurate charts get surprise invoices.
Pipe support spacing, anchor bolt design, and dynamic load calculations all depend on flange mass. A study in the Journal of Sound and Vibration (Luan et al., 2012) demonstrated that bolted flange joint weight significantly affects piping system dynamic response. Underestimating flange weight leads to undersized supports and potential pipe stress failures.
Flanges that are underweight for their stated class rating often use inferior steel with reduced wall thickness. These counterfeits fail hydrostatic testing and create safety hazards. A 2025 paper in Cureus Journal of Engineering on rigid flange coupling material selection emphasizes that substituting lower-density materials without weight verification is a leading cause of in-service coupling failure.
Modern procurement systems require accurate weight per unit for inventory valuation and logistics planning. Using a generic weight chart instead of a manufacturer-verified slip-on flange weight chart in kg creates systematic errors across ERP modules — from purchase orders to warehouse bin locations.
✅ The Fix: Source flanges from a manufacturer that provides certified weight data, third-party inspection reports, and material test certificates. That's precisely what we deliver at Cangzhou Weihuan — and why engineers across 20+ countries trust our specifications.
Below is our factory-verified slip-on flange weight chart in kg for raised-face (RF) slip-on welding flanges manufactured in accordance with ASME B16.5. Weights are based on ASTM A105 / A182 F304 / F316 carbon and stainless steel forgings. Actual weights may vary by ±3% due to forging tolerances and face finish.
| Nominal Pipe Size (NPS) | DN (mm) | Flange OD (mm) | Class 150 Weight (kg) | Class 300 Weight (kg) | Class 600 Weight (kg) | No. of Bolts |
|---|---|---|---|---|---|---|
| 1/2" | DN15 | 90 | 0.5 kg | 0.7 kg | 0.9 kg | 4 |
| 3/4" | DN20 | 100 | 0.7 kg | 0.9 kg | 1.2 kg | 4 |
| 1" | DN25 | 110 | 0.9 kg | 1.4 kg | 1.8 kg | 4 |
| 1-1/4" | DN32 | 120 | 1.2 kg | 1.8 kg | 2.4 kg | 4 |
| 1-1/2" | DN40 | 130 | 1.6 kg | 2.5 kg | 3.2 kg | 4 |
| 2" | DN50 | 150 | 2.1 kg | 3.2 kg | 4.1 kg | 4 |
| 2-1/2" | DN65 | 180 | 3.0 kg | 4.5 kg | 6.0 kg | 4 |
| 3" | DN80 | 190 | 3.8 kg | 5.8 kg | 7.8 kg | 4 |
| 4" | DN100 | 230 | 5.5 kg | 8.5 kg | 11.5 kg | 8 |
| 5" | DN125 | 255 | 7.0 kg | 11.0 kg | 15.0 kg | 8 |
| 6" | DN150 | 280 | 8.5 kg | 13.5 kg | 18.5 kg | 8 |
| 8" | DN200 | 345 | 12.5 kg | 20.0 kg | 28.0 kg | 8 |
| 10" | DN250 | 405 | 17.0 kg | 28.0 kg | 38.0 kg | 12 |
| 12" | DN300 | 485 | 22.5 kg | 37.0 kg | 52.0 kg | 12 |
| 14" | DN350 | 535 | 28.5 kg | 47.0 kg | 66.0 kg | 12 |
| 16" | DN400 | 595 | 35.5 kg | 59.0 kg | 82.0 kg | 16 |
| 18" | DN450 | 635 | 43.0 kg | 72.0 kg | 100.0 kg | 16 |
| 20" | DN500 | 700 | 52.0 kg | 88.0 kg | 122.0 kg | 20 |
* Weights are nominal for RF slip-on flanges per ASME B16.5. Always verify with the manufacturer's certified weight certificate for critical applications.
ASME B16.5 permits a manufacturing tolerance of +0% / -12.5% on flange thickness, which directly impacts weight. Our quality control process includes 100% dimensional inspection and random weight verification on every production batch. We provide actual weight data per heat number for traceability.
International freight charges are based on gross weight including pallets and packaging. For a 20ft container of 6" Class 150 slip-on flanges (~500 pieces), packaging adds approximately 5–7% to total weight. Our logistics team provides container loading plans with verified gross weights to prevent port demurrage.
A DIN 2576 PN10 slip-on flange for DN100 weighs approximately 4.5 kg, while an ASME Class 300 flange for the same bore weighs 8.5 kg. Always cross-reference the standard and pressure class. Our engineers can supply weight charts for ASME, DIN, EN 1092-1, JIS, and GOST standards on request.
Understanding the geometric variables behind a slip-on flange weight chart in kg helps engineers advocate for the right specifications. Three dimensions matter most:
Flange Outside Diameter (OD): Larger OD increases weight roughly by the square of the radius — doubling the OD quadruples the cross-sectional area.
Flange Thickness (T): Directly linear in weight. A 12.5% thickness increase adds 12.5% mass.
Hub Length & Bore Diameter: For slip-on flanges, the hub is shorter than weld-neck equivalents, making slip-ons 15–25% lighter than weld-neck flanges of the same class.
As documented in Elbow Stress Indices Using Finite Element Analysis, the geometric continuity of pipe fittings significantly impacts stress distribution in pipe networks. This is why dimensionally accurate flanges with verified weight are critical for ASME B31.3 process piping compliance.
👉 Request the full dimensional drawing package (PDF/DWG) for free →
If you need to verify a slip-on flange weight chart in kg for a non-standard size, use this engineering formula:
Where:
W = Weight (kg)
OD = Outside diameter (m)
ID = Inside diameter (m)
T = Thickness (m)
ρ = Density (kg/m³)
| Carbon Steel (A105) | 7,850 kg/m³ |
| Stainless 304/316 | 8,000 kg/m³ |
| Alloy Steel F11/F22 | 7,820 kg/m³ |
| Duplex 2205 | 7,810 kg/m³ |
Note: Stainless steel flanges are typically 2–3% heavier than carbon steel equivalents of the same dimensions.
Calculate the theoretical mass of a 4" (DN100) Class 150 slip-on flange in A105:
* Plus hub & raised face: actual ≈ 5.5 kg — matches our table. This confirms the accuracy of our chart data.
The relationship between flange geometry and mechanical performance is well-established. A study on the Optimal Design of 6in Offshore Flange Connector's Sealing Structure (Brodogradnja, DOI: 10.21278/brod75207) demonstrated that optimizing flange cone angle and curvature radius improves contact pressure while reducing equivalent stress. Similarly, the Simplified Nonlinear Dynamic Model for Pipe Structures with Bolted Flange Joints (Journal of Sound and Vibration, 2012) showed that flange mass and joint stiffness together govern the dynamic response of piping systems. These findings reinforce why accurate weight data is not just a logistics convenience — it's an engineering safety requirement.
Where and why engineers select slip-on flanges — and how weight data impacts project success.
Slip-on flanges are extensively used in low-pressure water lines (Class 150) where frequent disassembly is required for membrane cleaning. A typical desalination plant uses 4,000–6,000 slip-on flanges from NPS 2" to NPS 24". Using a certified slip-on flange weight chart in kg enabled one UAE plant to reduce freight costs by 11% by optimizing container load distribution.
Class 300 and 600 slip-ons are common in onshore well-gathering networks operating at moderate pressures. The R6 Failure Assessment Diagram method for defective elbows and tees used by integrity engineers requires accurate pipe-fitting mass data for fracture mechanics calculations. Our weight-certified flanges integrate seamlessly into asset integrity management systems.
In commercial HVAC systems, slip-on flanges connect chiller units, cooling towers, and pump manifolds. The reduced weight vs. weld-neck flanges translates to lower structural steel requirements for pipe supports. A New York mechanical contractor reported a 23% reduction in support fabrication man-hours after switching from structural steel stands to lighter-weight pipe hangers made possible by precise flange weight calculations.
Answers from our engineering and export team — based on real client inquiries from 2020–2026.
Our chart is based on actual weighing of mass-produced samples using calibrated scales (±0.1 kg accuracy for flanges up to NPS 12"). We publish theoretical weights per ASME B16.5 dimensions and validate every batch with spot checks. For certified weights, we provide a weight certificate alongside the material test report.
Slip-on flanges have a shorter hub and are welded on both the inside and outside of the pipe, whereas weld-neck flanges have a long tapered hub that adds material and distributes stress. For NPS 6" Class 150, a weld-neck weighs ~10.5 kg vs. ~8.5 kg for a slip-on — roughly 20% less. This is why slip-ons are favored for low-pressure, weight-sensitive applications.
Yes. We maintain weight data for DIN 2576 (PN10/16), EN 1092-1 Type 01, and JIS B2220 flanges. Since European projects often require EN compliance, we can supply an equivalent slip-on flange weight chart in kg for all common DN sizes. Contact our team with your standard and pressure class.
Sea freight is charged per cubic meter or per 1,000 kg (W/M), whichever is greater. Flanges are dense, so you pay by weight. A 20ft container can hold ~25 tons of flanges. Using our weight-optimized packaging and container loading plans, clients typically save 8–12% on total landed cost.
Our standard MOQ is 100 pieces for common sizes (NPS 1/2" to 4") and 50 pieces for NPS 6" and above. For OEM/ODM projects with custom drilling or materials, we can accommodate smaller trial orders. Mixed-size containers are available for consolidating multiple SKUs.
Every production batch undergoes 100% dimensional inspection and PMI (Positive Material Identification) testing. We welcome third-party inspections by SGS, BV, TÜV, or your designated inspector before shipment. Material test certificates per EN 10204 3.1/3.2 are provided. Hi-Test seamless pipe and fitting products comply with relevant CE and ISO standards.
Real feedback from procurement managers and engineers across our export markets.
"We ordered 2,400 pcs of Class 150 slip-on flanges for a water pipeline project in Houston. The weight chart matched our random sampling perfectly. The container arrived 3 days early, and we cut logistics costs by 9% using their loading plan."
"Their documentation is outstanding. Every flange batch came with Material Test Certificates and actual weight verification data. The DN250 Class 300 flange weights were within 2% of our calculations. Excellent product traceability."
"We've sourced from multiple Chinese suppliers; Weihuan is the only one that provided a verified slip-on flange weight chart in kg upfront. Their communication is fast — quote to delivery in 35 days. Highly recommended for EPC projects."
"The OEM capability impressed us. They customized a run of 316L stainless slip-on flanges with special bolt hole drilling for our chemical plant. The weights were exactly as per their chart. Zero defects in 1,200 pieces."
Inquiry: "Need weight chart for Class 300 slip-ons"
Quote: "48h response with full specs"
Status: "Order confirmed & production scheduled"
David Zhang is a senior piping engineer at Cangzhou Weihuan Pipeline Equipment Co., Ltd., with over 15 years of experience in the design, manufacturing, and quality control of flanges, pipe fittings, and MCI products. He has personally supervised exports to more than 20 countries and consulted on flange specifications for oil & gas, water treatment, and HVAC projects across North America, Europe, and the Middle East.
David is a member of the project team that successfully passed ISO 9001, CE, and GS compliance audits. He writes regularly on piping engineering best practices to help global buyers make informed, cost-effective procurement decisions.
Get a free quote within 24 hours — including a verified slip-on flange weight chart in kg for your exact specifications, container loading plan, and landed-cost estimate.
📍 Cangzhou Weihuan Pipeline Equipment Co., Ltd.
Middle section of National Highway 338, Mengcun Hui Autonomous County, Cangzhou City, Hebei Province, China
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