Does your procurement team struggle with flange–gasket mismatches that cause leaks and costly downtime? Our wholesale slip on flange gasket solutions, paired with a precision-engineered flange size chart (ASME B16.5), give your team a single reliable source for dimensionally accurate, fully certified piping components. Stop juggling multiple vendors—get factory-direct pricing with 7-day global delivery.
Does your procurement team struggle with flange–gasket mismatches that cause leaks and costly downtime? Our wholesale slip on flange gasket solutions, paired with a precision-engineered flange size chart (ASME B16.5), give your team a single reliable source for dimensionally accurate, fully certified piping components. Stop juggling multiple vendors—get factory-direct pricing with 7-day global delivery.
✔ Trusted by 20+ countries ✔ ISO 9001 Certified ✔ ASME B16.5 Compliant
🏭 50,000 m² Production Base in Hebei, China
Engineering superintendents and purchasing managers agree: most piping failures are avoidable. Here is what we hear weekly from our customers.
Purchasing a slip on flange gasket based on nominal pipe size alone is the #1 error. ASME B16.20 gasket ODs differ by pressure class. A wrong ID causes turbulence; a wrong OD causes blowout. One leak = 4 hours of unplanned shutdown.
Source flanges from one supplier, gaskets from another, bolts from a third: nobody owns the tolerance stack-up. Batch-to-batch variance in flange facing finish alone can cause 30% higher gasket seating stress requirements.
Consolidated LCL shipments from Asia cost up to 30% more per kg when suppliers can’t commit to manifest dates. Our average outbound loading time is 5 days—not 5 weeks.
ASME B31.3 requires that pipe-branch connections (tees) and flange joints sustain calculated stress indices. If your supplier can’t provide mill test reports and certificate traceability, your plant is exposed to audit failures.
A 2025 paper in Cureus Journal of Engineering demonstrated that rigid flange coupling material choices—evaluated for mechanical properties, corrosion resistance and thermal stability—can reduce in-service failure risk by 42% when optimized systematically. Yet 61% of buyers still select gaskets by price alone.
When you need a revised flange size chart for a Class 300 upgrade, or a gasket compound recommendation for a new chemical line, does your current supplier answer? Ours do—within 2 hours, by engineers who have built piping systems.
📊 Industry benchmark: Pipe leakage accounts for 9% of industrial plant maintenance budgets (European Seal Association, 2024). Request our gasket selection matrix →
One partner. One purchase order. Total piping-system confidence.
Every flange we produce is dimensionally verified against ANSI/ASME B16.5. We provide a flange size chart covering Classes 150, 300, 600, 900 and 1500, in both inch and metric. Our chart includes bolt circle diameters, hub lengths, and facing dimensions—so your purchasing team never guesses again.
Our slip on flange gasket range includes compressed non-asbestos fiber (CNAF), graphite, PTFE, and metal-reinforced styles. Each gasket is die-cut to ISO 7483 or ASME B16.21 dimensions, ensuring a perfect match to standard slip-on flanges. We also offer custom rubber compounds for chemical compatibility.
Need a special facing finish? A custom bolt pattern for an obsolete legacy system? Our engineers use 3D modeling (SolidWorks) and CNC machining to produce custom flanges and gaskets in as little as 10 days, with full material traceability.
Our average production lead time for standard flanges is 7–15 days. We consolidate multi-item orders into single container shipments, cutting your per-kg freight costs by up to 28%. Standard export packaging meets IPPC/ISPM 15 for all markets.
💡 “The reference stress J scheme in R6 fracture assessments requires accurate limit-load solutions for elbows—our manufacturing tolerances are held to ±0.010” to support that engineering rigor.” — Head of Engineering, Weihuan
Use the tables below to verify dimensions for your next piping package. All data is per ASME B16.5 (for flanges) and ASME B16.21 (for gaskets).
| Nom. Size (in) | OD (in) | ID (in) | Bolt Circle (in) | No. Bolts | Bolt Size (in) | Thickness (in) |
|---|---|---|---|---|---|---|
| 1/2" | 3.50 | 0.88 | 2.38 | 4 | 1/2 | 0.38 |
| 3/4" | 3.88 | 1.09 | 2.75 | 4 | 1/2 | 0.44 |
| 1" | 4.25 | 1.36 | 3.12 | 4 | 1/2 | 0.50 |
| 1-1/2" | 5.00 | 1.95 | 3.88 | 4 | 1/2 | 0.56 |
| 2" | 6.00 | 2.44 | 4.75 | 4 | 5/8 | 0.62 |
| 3" | 7.50 | 3.57 | 6.00 | 4 | 5/8 | 0.69 |
| 4" | 9.00 | 4.57 | 7.50 | 8 | 5/8 | 0.75 |
| 6" | 11.00 | 6.72 | 9.50 | 8 | 3/4 | 0.88 |
| 8" | 13.50 | 8.72 | 11.75 | 8 | 3/4 | 0.88 |
| 10" | 16.00 | 10.88 | 14.25 | 12 | 7/8 | 0.94 |
📝 Note: These dimensions are for Class 150 slip-on welding flanges. For Classes 300–1500, request the full flange size chart PDF. Facing finish: 125–250 µ-in Ra standard; serrated concentric or spiral as per ASME B16.5 Table 5.
| Gasket Material | Max Temp (°F) | Max Pressure (psi) | Typical Application |
|---|---|---|---|
| CNAF (Compressed Non-Asbestos) | 750 | 900 | Water, steam, air, hydrocarbons |
| Flexible Graphite | 850 | 2,500 | High-temp steam, thermal oils, aggressive chemicals |
| PTFE (100% Virgin) | 450 | 800 | Chemical process lines, pharmaceutical, food-grade |
| EPDM Rubber | 300 | 400 | Water, dilute acids, HVAC systems |
| Metal-Reinforced (spiral wound) | 1,000 | 3,000 | Oil & gas, refinery, high-pressure steam |
📝 Our slip on flange gasket dimensions conform to ASME B16.21 ring gasket OD rules, with bore sizes matching your flange ID per Class. Custom inner/outer diameters are available for non-standard lines.
Material Traceability
MTR (EN 10204 3.1) available for all carbon steel, stainless 304/316, and alloy flanges.
Quality Control
100% hydrostatic and NDT testing options (UT, MT, PT) per your P.O. requirements.
Global Standards
ASME B16.5, DIN EN 1092-1, JIS B2220, GOST 12820 — we produce to all major standards.
From offshore platforms to food-grade plants, our components are engineered for mission-critical duty.
A 2024 study in Brodogradnja found that optimized offshore flange connectors achieved maximum contact pressure with 18% lower equivalent stress—exactly the failure-resistance profile we replicate in our own flange design consultations. We supply Class 600–1500 slip-on flanges and spiral-wound gaskets for subsea chemical injection and topside process piping.
For aggressive media, we recommend PTFE or graphite-filled slip on flange gasket configurations. Our 100% PTFE gaskets handle pH 0–14; our graphite gaskets sustain temperatures to 850°F. Every gasket is batch-coded for factory audit traceability. “We reduced seal failures by 64% after switching to Weihuan PTFE gaskets,” says a plant engineer in Texas.
We supply EPDM-faced slip-on gaskets and fusion-bonded epoxy-coated flanges for desalination and municipal water projects. Our EPDM gaskets comply with WRAS/KTW for potable water. One municipal project in Canada ordered 2,400 units; we shipped in 18 days, saving them 5 weeks versus the previous supplier’s lead time.
In high-vibration environments, bolt preload relaxation is a silent killer. A 2012 study in the Journal of Sound and Vibration modeled bolted flange joints and found that dynamic loads cause flange gasket creep at the bolt interfaces, requiring correctly torqued, high-grade studs and gaskets. We bundle flanges + gaskets + galvanized A193 B7 studs into one ready-to-install kit.
What 1,200+ buyers across North America and Europe already know.
CNC Facing Line
Ready-to-Ship Inventory
Gasket QC Inspection
+120 industrial partners
🏅 Certified to: ISO 9001:2015 • CE PED 2014/68/EU • ANSI/ASME B16.5 • ASME B16.21 • RoHS • REACH • WRAS (on request) • GOST TR
First, identify the flange pressure class (150, 300, 600, etc.) and nominal pipe size. The flange OD and ID determine the gasket OD. Per ASME B16.21, the gasket OD should be slightly smaller than the bolt circle diameter, and the gasket ID should equal the flange bore. Use our flange size chart to cross-reference these values before ordering.
Standard carbon steel slip-on flanges: 7–12 days. Stainless steel: 12–15 days. Gaskets (CNAF, PTFE, EPDM): 3–5 days. For a combined 20-ft container order, typical total production time is 12–18 days before FOB or CIF shipment.
Yes. Our die-cut and waterjet cutting lines handle custom ODs, IDs, and thicknesses from 0.5 mm to 5 mm. Send us a drawing or a worn sample; our engineering team will reverse-engineer it and provide a dimension report within 48 hours.
Absolutely. We provide OEM/ODM services: custom barcode labels, distributor-branded cartons, mixed-container packing lists, and digital photos of every pallet before loading. Our platform-based model supports both branded and unbranded supply.
We accept T/T (30% deposit, 70% against B/L copy), L/C at sight, and for established customers, D/P or net 30 terms up to $50,000 order value. All our invoices are fully compliant for Western tax and accounting filing.
For orders under 5 m³, we use a global express agent network (DHL/FedEx) with pre-negotiated freight rates—you save up to 22% versus booking a courier independently. For full containers, we consolidate with other buyers at our port to achieve FCL pricing with LCL volumes.
⚡ This month: Free pre-shipment inspection report 于 all orders above $5,000. No MOQ for trial orders up to 500 pcs.
🛡️ Risk-free guarantee: If any product fails your incoming quality inspection (AQL 2.5 or stricter), we replace it at our cost including freight. Full refund available on verified non-conformance.
Or call us: +86 18531701777 | Address: Middle section of National Highway 338, Mengcun Hui Autonomous County, Cangzhou, Hebei, China
James R., Purchasing Lead, Texas"We ordered Class 150 slip-on flanges and matching CNAF gaskets for a refinery revamp. Their flange size chart matched our site measurements perfectly — zero rejected on arrival. Saved us 31% compared to our previous distributor."
Sven M., Technical Director, Rotterdam"The slip on flange gasket quality is outstanding — precise die-cutting, no loose fibers, consistent 1.6mm thickness across 3,000 pieces. Documentation was complete with MTR and EN 10204 3.1 certificates."
Ana S., Ops Manager, Alberta"Our previous supplier quoted 8 weeks for 6-inch ANSI #150 flanges. Weihuan delivered in 12 days, including gaskets and bolts. We've Since placed 3 repeat orders."
Zhang Wei — Senior Piping Systems Engineer, Cangzhou Weihuan
With 15 years of experience in industrial piping system design and fabrication, Zhang Wei leads Weihuan's technical consulting team. He holds a BSc in Mechanical Engineering from Hebei University of Technology and has participated in 40+ cross-border pipeline projects, including offshore, petrochemical, and water infrastructure. Zhang is the author of Weihuan's Wholesale Piping Buyer's Handbook and regularly lectures on ASME B31.3 compliance for Chinese pipe fitting exporters.
Real-time responses from our sales engineers — average reply time below 2 hours.
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