3/8 Hex Head Cap Screw & 3/8 Socket Cap Screw | Maker

DESCRIPTION

PRODUCT Tags

3/8 Hex Head Cap Screw & 3/8 Socket Cap Screw — Made by a Trusted Manufacturer

Cut procurement costs by 27–34% with factory-direct pricing, ISO-certified quality, and 10-day lead times for B2B buyers in the USA & Europe.

📩 Get Free Quote in 24h

✅ Free samples | ✅ ERP-ready specs | ✅ 30+ countries served

📑 Quick Navigation

🔹 Pain Points
🔹 Our Solution
🔹 Technical Specs
🔹 Proof & Trust
🔹 FAQ
🔹 Reviews
🔹 Contact

Why Your Current Fastener Supplier Is Costing You More Than You Think

Every procurement manager knows the pain: you order 3/8 hex head cap screws or 3/8 socket cap screws from a distributor, and by the time they arrive — marked up 3x, with inconsistent heat treatment, and paperwork that doesn't match your ERP fields — your margin has already evaporated.

⚠️ Price volatility: Spot-market pricing for 3/8 grade 8 hex bolts can swing 18% in a quarter — unpredictable for your quoting.
⚠️ Quality inconsistency: 1 in 12 socket cap screws from brokers fails proof-load testing (per ASTM F606) — leading to field failures.
⚠️ Shipping & lead time: Average distributor lead time for 3/8 hex head cap screws in 2025 was 22 days — with no real-time tracking.
⚠️ Compliance risks: Missing RoHS or conflict-mineral declarations can stall your OEM audit — costing you $12k–$40k in delays.
⚠️ Hidden TCO: 60% of buyers forget the cost of non-conformance, rework, and expedited freight — adding 14–22% to the PO.

📉 That's why 73% of mid-market industrial buyers are now sourcing directly from ISO-certified Chinese factories.

📊 Quick Cost Comparison

Distributor price (3/8 hex head, grade 8, qty 5000): $0.38/pc

Boen factory price (same spec): $0.24/pc

You save: $0.14/pc → $700 per order

*Based on actual 2025-2026 export pricing to USA ports.

🔧 Engineered for Reliability: Our 3/8 Hex Head & Socket Cap Screws

Boen Fastener delivers ASME/ANSI-compliant, full-traceability fasteners that meet the toughest specs for automotive, construction, and agricultural machinery.

🏭

Factory-Direct Power

We own the full production line — from wire drawing to heat treatment and plating. No middleman markup, no quality gaps.

🔬

Full Traceability

Every lot of 3/8 socket cap screws is stamped with heat code & batch number. Mill certs (MTR) included with every shipment.

🌍

Global Compliance

ISO 9001:2015, RoHS, REACH, and conflict-mineral declarations. Our 3/8 hex head cap screws pass ASTM F606 & SAE J429 testing.

⚡

High-Speed Delivery

Standard lead time: 10 working days for 3/8 hex & socket cap screws. Express air freight available in 5 days.

📐

OEM/ODM Ready

Need a custom flange, a special drive, or a unique plating? We design & produce custom 3/8 socket cap screws in 15 days.

📊

ERP-Ready Data

We provide digital specs (CSV/XML) for your procurement system — no manual data entry, fewer errors.

📋 Technical Specifications — 3/8 Hex Head Cap Screw & 3/8 Socket Cap Screw

Parameter	3/8 Hex Head Cap Screw	3/8 Socket Cap Screw
Diameter (nominal)	3/8 inch (0.375″)	3/8 inch (0.375″)
Thread pitch	UNC 16 TPI / UNF 24 TPI	UNC 16 TPI / UNF 24 TPI
Grade / strength	Grade 5 (120 ksi), Grade 8 (150 ksi)	Grade 8 (150 ksi), 12.9 (180 ksi)
Materials	Carbon steel 1035, 1045, alloy steel 4140	Alloy steel 4140, 4340, SS304, SS316
Standard	ASME B18.2.1, ANSI B18.2.1	ASME B18.3, ANSI B18.3
Finish / plating	Plain, zinc-plated, HDG, black oxide	Plain, zinc-plated, black oxide, phosphate
Length range	3/8″ to 6″ (custom up to 12″)	3/8″ to 6″ (custom up to 12″)
Drive type	External hex (1/2″ or 9/16″ socket)	Internal hex (5/32″ or 3/16″ hex key)
Testing certs	ASTM F606, SAE J429, RoHS	ASTM F606, SAE J429, RoHS, REACH

🔬 All specs verified by in-house lab & third-party testing. Mill certificates provided with every PO.

🚜 Where These Fasteners Perform

Agricultural machinery — 3/8 hex head cap screws in grade 8 for harvester frame joints; 3/8 socket cap screws for hydraulic pump mounts.
Automotive chassis & engine — 3/8 socket cap screws, 12.9 grade, used in connecting rods and cylinder heads.
Construction & structural steel — 3/8 hex head cap screws with HDG finish for outdoor trusses and railings.
Industrial equipment — 3/8 socket cap screws in stainless 316 for food-grade conveyor systems.

📈 Real-World Result

A German agri-equipment maker switched to Boen for their 3/8 hex head cap screws and saw 31% cost reduction with zero non-conformance in 14 months.

💬 Real Conversations with Our Clients

📸 Screenshots from actual client conversations — names and details redacted for privacy.

❓ Frequently Asked Questions — 3/8 Hex Head & Socket Cap Screws

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

The main difference is the drive type. A 3/8 hex head cap screw has an external hex head that requires a wrench or socket, while a 3/8 socket cap screw has a cylindrical head with an internal hex drive. Socket cap screws are often used where space is tight or a cleaner appearance is needed. Both are available in the same strength grades (e.g., Grade 8, 12.9).

What grade should I choose for structural applications?

For structural steel and heavy equipment, we recommend Grade 8 (150 ksi) for 3/8 hex head cap screws and 12.9 (180 ksi) for 3/8 socket cap screws. Both exceed ASTM A325 requirements for most construction and machinery applications.

Do you offer stainless steel options for 3/8 socket cap screws?

Yes. We supply 3/8 socket cap screws in SS304 (A2) and SS316 (A4) grades. Stainless versions are ideal for corrosive environments such as food processing, marine, and chemical plants.

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

Our standard MOQ is 2,000 pieces per size for stock items. For custom lengths or platings, MOQ is 5,000 pieces. We can also accommodate smaller trial orders for qualification.

How do you ensure the quality of 3/8 socket cap screws?

Every production lot undergoes proof-load testing, hardness testing, and dimensional inspection per ASTM F606. We also provide mill test reports (MTR) and third-party inspection reports upon request. Our ISO 9001:2015 system ensures full traceability.

What is the typical lead time for a 3/8 hex head cap screw order?

Standard lead time is 10 working days from order confirmation. For urgent orders, we offer express air freight in 5 working days. Sea freight to USA/Europe typically takes 25–35 days.

Can you provide custom packaging or private labeling?

Absolutely. We offer OEM/ODM packaging with your brand, barcode labels, and custom box quantities. We also provide ERP-ready packing lists in digital format for seamless receiving.

What payment terms do you offer for B2B buyers?

We accept T/T (30% deposit, 70% before shipment), L/C, and for qualified accounts, net 30 terms (subject to credit approval). We also have a USA representative to assist with local payment questions.

⭐ What Our Customers Say About Us

Lars H.

Procurement Manager, Sweden

“We’ve been sourcing 3/8 hex head cap screws from Boen for over two years. Their quality is consistent, and their lead times are the best we’ve seen from any supplier — 9 days average.”

Aisha M.

Supply Chain Lead, UAE

“The 3/8 socket cap screws we ordered for our oil-field equipment were perfect. The traceability reports and certifications made our audit seamless. Highly recommended.”

David L.

Operations Director, USA

“Boen helped us design a custom 3/8 hex head cap screw with a special flange. The prototype was delivered in 7 days, and production pricing was 34% below our current supplier.”

Written by Michael Chen

Senior Fastener Engineer & Export Lead — Handan Boen Fastener Manufacturing Co., Ltd.

Michael has 14 years of experience in industrial fastener design, quality systems (ISO 9001, IATF 16949), and global supply chain optimization. He has personally overseen over 800 export shipments to 30+ countries. His technical insights help B2B buyers reduce TCO while maintaining the highest quality standards.