📋 Table of Contents

3/8 Socket Head Cap Screw & 3/8 Socket Head Screw

⚙️ Factory-direct pricing — precision fasteners for automotive, construction & machinery. ISO 9001 | CE | RoHS

📥 Get Free Quote in 24h 📊 View Technical Specs

✅ Trusted by 30+ countries · 10+ years export expertise · OEM/ODM ready

3/8 Socket Head Cap Screw & 3/8 Socket Head Screw | Buy

🏭 Handan, China — Production Base

🔥 The Real Cost of Low-Quality Fasteners

Every year, 15–20% of procurement budgets are wasted on socket head cap screws that fail under torque, corrode prematurely, or arrive with inconsistent threads. Here’s what we hear from buyers like you:

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Hidden Cost Overruns

“We paid 18% less per unit, but rework costs ate 32% of our margin.” — US machinery OEM

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Delivery Delays

Lead times of 8–12 weeks from traditional suppliers kill project timelines.

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Inconsistent Quality

Mixed batches, wrong hardness, or missing certifications — a compliance nightmare.

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High Shipping Costs

Oversized packaging and slow sea freight add 12–20% to landed cost.

💡 You need a supplier that delivers precision, speed, and total cost transparency — every time.

✅ Why Boen Fastener’s 3/8 Socket Head Cap Screw Stands Above

Our 3/8 socket head screw line is engineered for reliability, repeatability, and rapid delivery — backed by a 10-year export track record and full traceability.

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Powerful Factory Direct

No middlemen. 30–40% cost savings vs. branded distributors. 12,000+ SKUs in stock.

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Quality Assurance

ISO 9001, CE, RoHS, FCC, UL-certified. 100% dimensional inspection on every batch.

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High-Speed Delivery

Sample lead time: 5–7 days. Bulk orders shipped within 15–25 days via air/sea.

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OEM/ODM Customization

Custom head marking, thread length, material grade (A2-70, A4-80, 12.9). Your design, our precision.

📐 Technical Specifications — 3/8 Socket Head Cap Screw

Parameter	Specification	Available Options
Thread Size	3/8″ – 16 UNC / 3/8″ – 24 UNF	UNC, UNF, metric M10
Length Range	1/2″ to 6″ (12 mm – 150 mm)	Custom lengths available
Material Grade	Alloy Steel 12.9, Stainless A2-70, A4-80	304, 316, 316L, 17-4 PH
Hardness	HRC 38–44 (Grade 12.9)	HRC 22–32 (Stainless)
Finish	Black Oxide, Zinc Plated, Hot-Dip Galvanized	Dacromet, Geomet, PTFE, passivation
Certifications	ISO 9001, CE, RoHS, FCC, UL	Full traceability report included

🔍 All 3/8 socket head screws are tested per ASTM F912 / ISO 898-1. Custom grades and plating available for OEM/ODM projects.

🛠️ Where Our 3/8 Socket Head Cap Screw Delivers

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Agricultural Machinery

High-torque joints for harvesters & tractors

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Construction Equipment

Structural fixings & heavy-duty frames

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Automotive Assembly

Engine mounts, chassis, brake systems

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Industrial Machinery

Pumps, compressors, conveyor systems

📌 Case study: A German construction supplier reduced fastener failure by 73% after switching to Boen’s 3/8 socket head cap screw.

❓ Frequently Asked Questions About 3/8 Socket Head Screw

What is the difference between a 3/8 socket head cap screw and a regular hex bolt?

A 3/8 socket head cap screw has a cylindrical head with a hex socket drive, allowing for higher torque and a cleaner appearance. It’s ideal for tight spaces where a wrench cannot fit. Regular hex bolts require external wrenching and typically have lower tensile strength.

Can you supply 3/8 socket head screws in stainless steel for marine environments?

Absolutely. We offer A4-80 (316L) stainless steel with passivation, ideal for coastal or chemical environments. Our 3/8 socket head screw in A4-80 provides excellent corrosion resistance.

What is the minimum order quantity (MOQ) for 3/8 socket head cap screws?

Our standard MOQ is 500 pcs per size. For OEM/ODM custom orders, MOQ is 2000 pcs. Sample orders (50–100 pcs) are available for testing with a lead time of 5–7 days.

How do you ensure quality for 3/8 socket head screws?

Every batch undergoes 100% dimensional inspection, hardness testing, and salt spray testing per ASTM standards. We provide a Certificate of Conformance with every shipment. Third-party inspection (SGS, TÜV) is also available.

What are the typical shipping costs and delivery times to the USA?

For a standard 500kg order, sea freight to the US West Coast costs approximately $0.40–$0.60/kg, with transit time 18–25 days. Air freight options are available at competitive rates. We consolidate shipments to reduce your landed cost.

Do you offer custom head marking or packaging for 3/8 socket head cap screws?

Yes. We support custom laser marking, head stamping, and private-label packaging (boxes, labels, poly bags). OEM/ODM is our specialty — just share your drawing or sample.

What payment terms do you accept?

We accept T/T, L/C, and PayPal for samples. For bulk orders, 30% deposit + 70% balance against copy of B/L. Letters of credit from major banks are welcome.

Can I get a sample of the 3/8 socket head screw before placing a bulk order?

Of course. We offer free samples for qualified buyers (you pay shipping). Just send your inquiry, and we’ll arrange a sample set within 5 days.

⭐ Real Reviews from Global Buyers

David H.

US Construction Equipment

“We’ve been using Boen’s 3/8 socket head cap screw for 18 months. Zero failures, consistent threads, and the pricing is unbeatable. 17% reduction in our fastener spend.”

Anna L.

German Automotive OEM

“The 3/8 socket head screw from Boen passed our full PPAP audit. First-pass yield improved by 12%. Excellent communication and technical support.”

Carlos M.

Spanish Industrial Distributor

“Fast, reliable, and the quality is always spot-on. Our customers love the 3/8 socket head cap screw — we’ve reordered 6 times this year.”

✍️ Written by Liang Wei — Senior Fastener Engineer, Boen Fastener

With 14 years in industrial fastener manufacturing and export, Liang has overseen 500+ B2B projects across 30+ countries. He specializes in socket head cap screw engineering and supply chain optimization for heavy industries.