1/4-20 x 3/4 Socket Head Cap Screw & 1/4-28 Socket Cap | Maker

DESCRIPTION

PRODUCT Tags

Precision-Grade 1/4-20 x 3/4 & 1/4-28 Socket Cap Screws — Direct from the Maker

Eliminate costly supply-chain markups. Factory-direct pricing on 1/4-20 x 3/4 socket head cap screws and 1/4-28 socket cap screws — with full traceability, ISO 9001 quality, and 7-day express shipping to the US and Europe.

📦 Get Free Quote in 24h 📞 Talk to Engineer

✅ 30+ countries served | ✅ 10+ years export expertise | ✅ Free samples available

📋 Contents

1. The Sourcing Pain 2. Our Solution 3. Technical Specs 4. Proof & Partners 5. FAQ 6. Get Started 7. Reviews

Why Most Buyers Overpay for 1/4-20 x 3/4 Socket Head Cap Screws

The fasteners you rely on every day — 1/4-20 x 3/4 socket head cap screw and 1/4-28 socket cap screw — are often sourced through multi-layer distributors. Here’s what that costs you:

💰

40–60% Hidden Markup

Distributors add 2–3 margins before the screw reaches your dock. Factory-direct from Boen eliminates that entirely.

⏳

Lead Times Over 8 Weeks

Offshore suppliers without stock keep you waiting. Our 7-day express program changes that.

🔧

Inconsistent Grade & Tolerance

Mixed batches from brokers cause rework. Every 1/4-28 socket cap screw we ship is 100% gauged.

📄

Compliance Risks

Missing RoHS, CE, or ISO certs can halt your line. We provide full documentation with every shipment.

The Boen Advantage: Maker-Direct Socket Cap Screws

We don’t trade fasteners — we manufacture them. Every 1/4-20 x 3/4 socket head cap screw and 1/4-28 socket cap screw leaves our Handan factory with full material traceability.

🏭

Factory-Direct Pricing

Save 30–50% vs. distributor pricing on 1/4-20 x 3/4 socket head cap screw orders. No middlemen, no surprises.

✅

ISO 9001:2015 Certified

Every 1/4-28 socket cap screw is produced under a certified quality management system. Third-party audited.

🚚

7-Day Express to US/EU

Stock sizes ship within 7 business days. Air freight option for urgent production lines.

🔬

100% Dimensional Check

Each batch is gauged for thread pitch, head height, and hardness. Reject rate below 0.2%.

🎨

OEM/ODM Customization

Need a special coating, drive type, or material? We engineer custom socket cap screws to your print.

📊

Full ERP Integration

We provide packing lists, COA, and commercial invoices in your format. Seamless procurement workflow.

🔧 Technical Specifications — 1/4-20 x 3/4 Socket Head Cap Screw & 1/4-28 Socket Cap Screw

All data verified by Boen’s in-house lab. Every value is traceable to batch records.

Parameter	1/4-20 x 3/4 Socket Head Cap Screw	1/4-28 Socket Cap Screw
Thread Size	1/4″ – 20 UNC	1/4″ – 28 UNF
Thread Pitch	20 threads per inch	28 threads per inch
Length (under head)	3/4″ (19.05 mm)	3/4″ (19.05 mm) — also available in 1/2″ to 6″
Head Diameter	0.375″ (9.53 mm) ±0.005″	0.375″ (9.53 mm) ±0.005″
Head Height	0.250″ (6.35 mm) ±0.005″	0.250″ (6.35 mm) ±0.005″
Grade / Material	Grade 8 (SAE J429) / 42CrMo4 steel	Grade 8 (SAE J429) / 42CrMo4 steel
Hardness (HRC)	33–39 HRC	33–39 HRC
Tensile Strength (min)	150,000 psi	150,000 psi
Finish	Black oxide / Zinc plated / Plain	Black oxide / Zinc plated / Plain
Drive Type	Hex socket (Allen) — 3/16″ key	Hex socket (Allen) — 3/16″ key
Certifications	ISO 9001, RoHS, CE, UKCA	ISO 9001, RoHS, CE, UKCA
Packaging	Bulk / Box / Retail-ready labels	Bulk / Box / Retail-ready labels

📌 Application note: The 1/4-20 x 3/4 socket head cap screw is ideal for general machinery and automotive assembly. The 1/4-28 socket cap screw (fine thread) provides higher clamp load and vibration resistance — perfect for aerospace and precision equipment.

💬 Real Conversations with Our Clients

❓ Frequently Asked Questions

Q1: What is the difference between 1/4-20 x 3/4 socket head cap screw and 1/4-28 socket cap screw?

The 1/4-20 x 3/4 socket head cap screw has a coarse thread (20 TPI) — better for general assembly, softer materials, and quick installation. The 1/4-28 socket cap screw has a fine thread (28 TPI) — higher clamp load, better vibration resistance, and finer adjustment. Choose 1/4-28 for precision machinery, aerospace, or high-vibration environments.

Q2: What grade are your socket head cap screws?

We primarily manufacture Grade 8 (SAE J429) — 150,000 psi min tensile strength, 33–39 HRC. We also offer Grade 5 and stainless steel (A2/A4) upon request. Every batch includes a Mill Certificate.

Q3: What is the minimum order quantity (MOQ) for 1/4-20 x 3/4 socket head cap screw?

For stock sizes, MOQ is 5,000 pieces. For custom lengths or coatings, MOQ is 20,000 pieces. We can also do mixed container loads to hit your budget.

Q4: Do you offer free samples for 1/4-28 socket cap screw?

Yes. We provide free samples (up to 50 pieces) for qualified buyers. You pay only shipping. Request via our contact form or WhatsApp.

Q5: How long does shipping take to the USA or Europe?

Standard sea freight: 18–25 days to US West Coast / Rotterdam. Express air freight: 5–7 business days. We also have local warehouse stock in select regions.

Q6: What payment methods do you accept?

We accept T/T (bank transfer), L/C, Western Union, and PayPal (for sample orders). For first-time buyers, 30% deposit / 70% balance against copy of B/L is standard.

Q7: Can you customize the head marking or packaging?

Absolutely. We offer OEM head markings (your logo, grade, etc.), custom labels, barcode scanning, and retail-ready packaging. Just send your artwork or spec.

Q8: Do you have certifications for the 1/4-20 x 3/4 socket head cap screw?

Yes. All our socket cap screws are produced under ISO 9001:2015. We also provide CE, RoHS, UKCA, and FCC declarations on request. Third-party inspection (SGS, TÜV) is welcome at your cost.

⭐ What Our Customers Say

Real feedback from buyers who use 1/4-20 x 3/4 socket head cap screws and 1/4-28 socket cap screws in their daily operations.

David Chen
Ops Manager, Singapore

"We use 1/4-20 x 3/4 socket head cap screw in our conveyor systems. Boen’s quality is consistent — less than 0.1% defect rate over 200k pieces."

Anna Kowalski
Buyer, Poland

"The 1/4-28 socket cap screw fine thread is perfect for our robotics arms. Fast shipping and great communication. 5-star supplier."

Tom Harrison
Procurement Lead, USA

"Boen helped us cut fastener costs by 34%. Their 1/4-20 x 3/4 socket head cap screw pricing is unbeatable for the grade. Highly recommend."

About the Author — Li Wei · Senior Fastener Engineer, Boen Fastener

Li Wei has 14 years of experience in cold forging, heat treatment, and thread rolling of socket cap screws. He leads Boen’s quality lab and has personally overseen over 500 export shipments of 1/4-20 x 3/4 socket head cap screw and 1/4-28 socket cap screw to US and European markets. His technical articles are used by procurement teams as a reference for fastener specification.