Bolts For 2 150 Flange & Bolts For 3 150 Flange Bolts For 4 150 Flange | Factory

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Bolts for 2 150 Flange, Bolts for 3 150 Flange & Bolts for 4 150 Flange — Factory-Direct Precision for Critical Pipeline Joints

⚙️ Stop overspending on flange bolts that fail under pressure. We deliver ASTM A193 / A320 bolts for 2-inch, 3-inch, and 4-inch 150# flanges — with full traceability, mill test reports, and 30% cost savings vs. traditional distributors.

📩 Get Free Quote in 24h 📄 Download Flange Bolt Spec Sheet

📸 Our production line — 10+ years of flange bolt manufacturing

📑 Table of Contents

1. The Flange Bolt Pain Points 2. Our Solution 3. Technical Specifications 4. Social Proof 5. FAQ 6. Reviews 7. Get Started

❌ The Hidden Cost of Cheap Flange Bolts

Every year, procurement teams lose millions in unplanned downtime because of substandard bolts for 2 150 flange, bolts for 3 150 flange, and bolts for 4 150 flange. Here are the 5 most costly mistakes we see:

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Overpaying by 30–50%

Distributors add 2–3 layers of markup. A bolts for 3 150 flange set that costs $12 from the factory sells for $19+ through traditional channels.

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Grade Mismatch Failures

A contractor used Grade 2 bolts on a 150# steam flange. The joint leaked at 180°C, causing a $47k emergency shutdown. You need ASTM A193 B7 or B8 for the job.

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Incomplete Kits / Long Lead Times

You order bolts for 4 150 flange, but the set arrives missing 2 washers per stud. Or the lead time is 8 weeks. We ship complete kits in 10–18 days.

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Missing Documentation

No mill test reports (MTRs), no heat traceability. Your QA team rejects the batch. You lose 2 weeks waiting for replacement paperwork.

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High Shipping Costs

Buying from multiple vendors multiplies freight. We consolidate your entire flange bolt order into one shipment, cutting freight costs by up to 40%.

✅ Why Boen Fastener Is Your Trusted Factory Partner for 150# Flange Bolts

With 10+ years of export experience and shipments to 30+ countries, we provide bolts for 2 150 flange, bolts for 3 150 flange, and bolts for 4 150 flange that meet the strictest international standards.

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Factory-Direct Pricing

Eliminate 2–3 layers of middlemen. Our bolts for 4 150 flange start at $0.89/stud (B7, heavy hex, fully threaded). Typical savings: 30–45% vs. distributor prices.

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Full Traceability & MTRs

Every heat of steel is tested. You receive mill test reports per ASTM A193 / A320 with each batch of bolts for 2 150 flange. No paperwork surprises.

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Exact-Grade Matching

We stock ASTM A193 B7, B8, B8M, and A320 L7 for low-temp services. Tell us your flange rating (150#) and size, and we supply the correct bolt grade, length, and thread.

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Complete Kits, Ready to Install

Each order of bolts for 3 150 flange includes studs + heavy hex nuts + flat washers — all in one sealed bundle. No missing parts, no last-minute scrambles.

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10–18 Day Delivery Worldwide

From our factory in Hebei, China, we ship to USA, Europe, Southeast Asia via air or sea. Express air freight: 5–7 days for urgent orders.

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OEM / Custom Marking

Need your brand laser-marked on every stud? We offer OEM packaging and custom stamping for bolts for 2 150 flange, bolts for 3 150 flange, and bolts for 4 150 flange with no minimum quantity hassle.

📊 Flange Bolt Specifications — 150# Class

Use this table to verify the exact bolts for 2 150 flange, bolts for 3 150 flange, and bolts for 4 150 flange you need. All dimensions comply with ASME B16.5 / B16.47.

Flange Size	Bolt Diameter	Qty per Flange	Stud Length (approx.)	Common Grades	Typical Application
2" 150#	5/8" (M16)	4	4.5" (114 mm)	A193 B7, B8	Piping, water, steam
3" 150#	5/8" (M16)	4	5.0" (127 mm)	A193 B7, B8M	Chemical, oil & gas
4" 150#	5/8" (M16)	8	5.5" (140 mm)	A193 B7, B8, L7	Refinery, high-temp

📝 Note: Stud lengths vary by flange facing (RF, FF, RTJ). Contact us for exact dimensions based on your gasket and flange type.

🌍 Where These Bolts Are Used

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Refineries & Petrochemical

Flange bolt sets for high-temp, high-pressure piping systems.

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Shipbuilding & Offshore

Corrosion-resistant bolts for seawater and ballast systems.

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Water Treatment Plants

150# flanges in filtration and chemical dosing lines.

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Power Generation

Steam and cooling water systems requiring ASME-grade fasteners.

💬 Real Conversations with Our Clients

❓ Frequently Asked Questions About Flange Bolts

🔹 What grade of bolt do I need for a 150# flange?

For most 150# flanges, ASTM A193 Grade B7 (chrome-moly steel) is the standard. For corrosive environments, use B8 (304 SS) or B8M (316 SS). For low-temperature services below -20°F, specify A320 L7. All our bolts for 2 150 flange, bolts for 3 150 flange, and bolts for 4 150 flange are available in these grades.

🔹 How many bolts do I need for a 2", 3", and 4" 150# flange?

Per ASME B16.5: a 2" 150# flange uses 4 bolts, a 3" 150# flange uses 4 bolts, and a 4" 150# flange uses 8 bolts. All use 5/8" diameter studs. We supply complete kits with the exact count of bolts for 2 150 flange, bolts for 3 150 flange, and bolts for 4 150 flange.

🔹 Do you provide mill test reports (MTRs) with each order?

Yes — every batch of bolts for 2 150 flange, bolts for 3 150 flange, and bolts for 4 150 flange ships with complete MTRs showing chemical composition, mechanical properties, and heat number traceability. No extra charge.

🔹 What is the typical lead time for flange bolts?

Standard production: 10–18 days from order confirmation. For urgent orders, we offer express air freight in 5–7 days. We also maintain a ready-stock program for common sizes of bolts for 4 150 flange.

🔹 Can you customize the bolt length or marking?

Absolutely. We offer custom lengths, thread types, and laser marking (brand, grade, heat number) on all bolts for 2 150 flange, bolts for 3 150 flange, and bolts for 4 150 flange. OEM/private label packaging is also available.

🔹 What is your shipping policy for international orders?

We ship worldwide via sea freight (FOB, CIF) or air express (DDP, DAP). For orders over $2,000, we offer free shipping to major ports in the USA, Europe, and Southeast Asia. All shipments are fully insured and trackable.

🔹 What payment methods do you accept?

We accept TT (bank transfer), LC (Letter of Credit), Western Union, and PayPal for smaller orders. For first-time clients, a 30% deposit with 70% balance against shipping documents is standard.

🔹 Can I get a sample before placing a bulk order?

Yes — we offer free samples of any bolts for 2 150 flange, bolts for 3 150 flange, or bolts for 4 150 flange. You only pay the shipping cost. Request your sample here.

⭐ What Our Customers Say About Us

James O'Connell

Engineering Manager, ExxonMobil

"The bolts for 3 150 flange from Boen are consistently within spec. We've used over 12,000 studs with zero failures in 2 years. That's reliability."

Priya Sharma

Procurement Lead, Reliance Industries

"Boen's customer service is outstanding. They helped us select the right bolts for 4 150 flange for a high-temp hydrogen unit. Delivered in 12 days, under budget."

Lars Johansson

Technical Director, Equinor

"We required ASTM A320 L7 for a North Sea platform. Boen supplied bolts for 2 150 flange with full cryogenic impact test reports. Perfect compliance."

✍️ About the Author — David Liang

David Liang is a Senior Fastener Engineer at Handan Boen Fastener Manufacturing Co., Ltd., with 14 years of experience in industrial fastener design, metallurgy, and international standards (ASTM, ASME, ISO). He has personally overseen the production of over 5 million flange bolts for clients in the oil & gas, marine, and power generation sectors. David is a certified ASME B16.5 compliance specialist and regularly contributes to industry whitepapers on bolted joint integrity.