1/4-28 Socket Head Cap Screw & 1/4-28 x 1 Screw | Wholesale
1/4-28 Socket Head Cap Screw & 1/4-28 x 1 Screw – Wholesale Direct from China Factory
🔧 Stop overpaying for standard fasteners. Get Grade 8 alloy steel, full traceability, and 30% lower cost than US distributors – with OEM/ODM flexibility and 10-day lead time.
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⚠️ Why Most Buyers Are Frustrated with 1/4-28 Socket Head Cap Screw Supply
Price Markups > 40%
US/European distributors add 30–50% margin on standard fasteners. For a 1 4 28 x 1 socket head cap screw, that means paying $0.28–$0.45 per piece when factory cost is under $0.15.
Inconsistent Quality & Failures
32% of procurement managers report thread galling or head shearing in cheap imported fasteners. A single failure in a $50k assembly can cost $2,000+ in downtime.
Hidden Shipping & Lead Time
Many suppliers quote low prices but add $80–$150 freight per order. Lead times of 6–8 weeks are common. We deliver 10–18 days door-to-door with transparent DDP options.
No OEM/ODM Flexibility
Standard 1 4 28 socket head cap screw suppliers refuse custom lengths, coatings, or material grades. You need a partner who can do zinc plating, black oxide, or 316SS on demand.
✅ Boen Fastener – Your Direct Factory Partner for 1/4-28 Socket Head Cap Screws
We produce 2 million+ fasteners monthly in our 15,000m² Hebei plant, with ISO 9001:2015, RoHS, and FCC compliance. Every 1 4 28 x 1 screw is traceable from melt to shipment.
Direct Factory Price
Eliminate 2–3 layers of intermediaries. Our 1 4 28 socket head cap screw wholesale pricing is 30–45% lower than US master distributors. Volume discounts up to 500,000 pcs.
Grade 8 Alloy Steel (ASTM A574)
All 1 4 28 x 1 socket head cap screw are made from SCM435 alloy steel, heat-treated to HRC 38–44. Tensile strength ≥ 1,200 MPa. Third-party lab reports available.
10-Day Lead Time
Stock sizes (1/4-28 x 1/2" to 2") ship in 5–7 days. Custom specs in 10–14 days. We keep 50 tons of raw material ready. Expedite options available for urgent orders.
OEM/ODM & Custom Coating
Need a 1 4 28 socket head cap screw with black oxide, zinc-nickel, or PTFE? We offer 12+ finishes. Custom head marking, non-standard lengths, and mixed material batches welcome.
📊 Technical Specifications – 1/4-28 Socket Head Cap Screw
| Parameter | Specification (1/4-28) | Notes |
|---|---|---|
| Thread Size | 1/4-28 UNF (2A / 2B) | Unified Fine Thread – 28 TPI |
| Length Options | 1/2" , 3/4" , 1" (1 4 28 x 1), 1-1/2" , 2" | Custom lengths available ±0.5mm |
| Material | SCM435 Alloy Steel (Grade 8) | Equivalent to 10.9 / 12.9 |
| Hardness (HRC) | 38 – 44 HRC | Consistent core hardness |
| Tensile Strength | ≥ 1,200 MPa (174 ksi) | Exceeds ASTM A574 |
| Head Type | Socket Head (Hexagon Drive) | Allen key size 3/16" |
| Coatings | Zinc, Black Oxide, Zn-Ni, Dacromet | ≥ 72h neutral salt spray |
| Certifications | ISO 9001, RoHS, FCC, CE | Full material traceability |
🏗️ Where 1/4-28 Socket Head Cap Screws Are Used
Agricultural Machinery
Tractor linkages, harvester blade mounts
Automotive Assembly
Engine brackets, transmission mounts, chassis
Industrial Machinery
Jig fixtures, press tooling, conveyor systems
Energy & Solar
Solar panel frames, wind turbine fasteners
🤝 Trusted by Global Buyers
Mark Thompson
Procurement Manager, Midwest Machinery (USA)"We switched to Boen for our 1 4 28 x 1 socket head cap screw needs. 42% cost savings vs our previous distributor, and the quality is consistent – zero failures in 6 months. Their DDP shipping makes logistics hassle-free."
Elena Voss
Technical Director, Voss Automotive (Germany)"The hardness and thread accuracy of Boen's 1 4 28 socket head cap screw are perfect for our high-torque applications. Their ISO 9001 & RoHS compliance made our auditing team happy. Lead time was just 12 days."
Ahmed Al-Rashid
Supply Chain Director, Gulf Energy (UAE)"We needed 500,000 pcs of 1 4 28 x 1 screw with zinc-nickel coating for a solar project. Boen delivered 100% on spec and saved us 37% compared to European suppliers. Highly reliable."
❓ Frequently Asked Questions About 1/4-28 Socket Head Cap Screws
🔹 What is the difference between a 1 4 28 socket head cap screw and a regular bolt?
A 1 4 28 socket head cap screw has a cylindrical head with a hexagon socket drive, designed for high-torque applications where external wrench clearance is limited. It typically meets Grade 8 (ASTM A574) strength, while a standard bolt is often Grade 5 or less.
🔹 What is the exact length of a 1 4 28 x 1 socket head cap screw?
The "1" refers to the nominal length under the head – 1 inch (25.4 mm). Total overall length (including head height) is approximately 1.188 inches (30.2 mm). We can produce custom lengths from 0.5" to 6".
🔹 What are the standard packaging options for wholesale orders?
We offer bulk cartons (25 kg / 50 kg), small poly bags, or custom OEM packaging with your brand. For 1 4 28 socket head cap screw orders over 10,000 pcs, we recommend bulk cartons to reduce freight cost.
🔹 How do you ensure quality control for export orders?
Every batch undergoes dimensional inspection (CMM), hardness testing, salt spray test, and torque test. We provide a Certificate of Conformance with each shipment. Third-party inspection (SGS, TÜV) is welcome at your cost.
🔹 What is the minimum order quantity (MOQ) for 1 4 28 x 1 socket head cap screws?
For stock sizes, MOQ is 2,000 pcs. For custom lengths or coatings, MOQ is 5,000 pcs. We can also offer sample orders (50–100 pcs) for qualification at a small fee (refundable with bulk order).
🔹 What payment terms do you accept for international buyers?
We accept T/T (wire transfer), L/C (Letter of Credit) for established clients, and Western Union for small orders. For first-time buyers, 30% deposit + 70% before shipment is standard. PayPal is available for samples.
🔹 How long does shipping take to the USA or Europe?
By sea freight (FOB Shanghai / Tianjin): 25–35 days. By air express (DHL / FedEx): 5–7 days. We offer DDP (Delivered Duty Paid) for USA and EU, so you pay one price with no hidden fees.
🚀 Ready to Cut Your Fastener Costs by 30%+?
Get a free sample of our 1 4 28 socket head cap screw and a custom quote within 24 hours.
⏳ Limited-time: Free shipping on first order over $500. 30-day money-back guarantee on sample quality.
Or call us: +86 13293070568 | Email: mary@fastenboen.com / grace@fastenboen.com
✍️ About the Author – Zhao Wei
Senior Fastener Engineer, Handan Boen Fastener Manufacturing Co., Ltd. With 14 years of experience in fastener manufacturing, Zhao oversees all technical specifications and quality systems for export-grade 1 4 28 socket head cap screw production. He has personally managed over 200 international B2B projects and holds certifications in ISO 9001 auditing and ASTM fastener standards.
