1/4-20 UNC Socket Head Cap Screw & 1/4-20 x 1/2 Screw | Factory
Precision-Grade 1/4-20 UNC Socket Head Cap Screw & 1/4-20 x 1/2 Screw โ Factory Direct
Stop overpaying for inconsistent quality. We supply ASTM A574 & ISO 4762 certified socket head cap screws with full traceability, 30% lower landed cost compared to distributors, and same-day dispatch for high-volume OEM orders.
โ 10+ years export ยท 30+ countries ยท ISO 9001 ยท UL ยท CE ยท RoHS
๐ธ 50,000 sqm facility ยท 200+ CNC machines
The Hidden Cost of Substandard Fasteners in Your Assembly Line
Every loose thread, every head failure, every delayed shipment erodes your margin and reputation.
Inconsistent Thread Fit
A 0.02mm deviation in the 1/4-20 UNC socket head cap screw thread profile causes 15% higher rejection rates during final assembly. Our customers report zero thread jamming incidents after switching.
Supply Chain Fragmentation
Sourcing from three different distributors for the 1/4-20 x 1/2 socket head cap screw increases your logistics cost by 22% and adds 4โ6 days of lead time. One factory, one P.O., one shipment.
Hidden Cost of Low-Grade Material
Using non-traceable alloy steel for 1/4-20 UNC fasteners leads to hydrogen embrittlement failures. A single recall costs $50Kโ$200K. We use 100% mill-certified 10.9 / 12.9 steel.
High Shipping & Tariff Risk
LCL shipments from small suppliers cost $0.18โ$0.35/piece in freight. Our consolidated FCL containers bring per-unit freight below $0.04 for the same 1/4-20 x 1/2 screw.
"We eliminated 90% of our torque-related rework after switching to Boen's 1/4-20 UNC socket head cap screw." โ Engineering Manager, US Automotive Tier 1
Engineered for Reliability: Our 1/4-20 UNC Socket Head Cap Screw Advantage
Every batch is tested, certified, and traceable back to the melt. Here is how we deliver consistent quality at factory-direct prices.
100% In-House Manufacturing
From cold heading, thread rolling, heat treatment to surface finishing โ all under one roof. Full control over every 1/4-20 x 1/2 socket head cap screw we ship.
Material & Dimensional Certification
Each lot of 1/4-20 UNC socket head cap screw includes a mill certificate (EN 10204 3.1) and dimensional report. ASTM A574, ISO 4762, DIN 912 compliant.
15-Day Lead Time for OEM Volumes
500,000+ pieces of 1/4-20 x 1/2 socket head cap screw in stock. For custom specs, we deliver 15โ25 days from P.O. โ 40% faster than industry average.
Factory-Direct Pricing, No Middleman
Eliminate 3โ4 layers of margin. Our 1/4-20 UNC socket head cap screw typically lands at 30โ45% less than US/EU distributor prices for equivalent quality.
Custom Packaging & Kitting
Bulk bags, shrink-wrapped trays, or private-label boxes. We integrate with your ERP / inventory system โ barcode, color-coding, or custom labelling.
Global Logistics, Local Compliance
We handle DDP, FOB, CIF to any port. All 1/4-20 x 1/2 socket head cap screw shipments include RoHS, REACH, and Conflict Minerals declarations.
๐ Technical Specifications โ 1/4-20 UNC Socket Head Cap Screw
All data verified per ASTM A574 & ISO 4762. 1/4-20 x 1/2 socket head cap screw variant highlighted.
| Parameter | 1/4-20 UNC Socket Head Cap Screw | 1/4-20 x 1/2 Socket Head Cap Screw |
|---|---|---|
| Thread Size | 1/4" โ 20 UNC (Coarse) | 1/4" โ 20 UNC (Coarse) |
| Length | 1/4" to 4" (custom up to 6") | 1/2" (12.7 mm) |
| Drive Type | Hex Socket (Allen) โ 5/32" | Hex Socket (Allen) โ 5/32" |
| Head Diameter | 0.375" (9.53 mm) max | 0.375" (9.53 mm) max |
| Head Height | 0.250" (6.35 mm) max | 0.250" (6.35 mm) max |
| Material Grade | Alloy Steel 10.9 / 12.9, SS 304, SS 316 | Alloy Steel 10.9 (std), SS 304 (opt) |
| Tensile Strength | 150,000 โ 180,000 psi (10.9โ12.9) | 150,000 psi (Grade 10.9) |
| Surface Finish | Plain, Black Oxide, Zinc Plated, HDG | Zinc Plated (Clear / Yellow) |
| Standards | ASTM A574, ISO 4762, DIN 912, ASME B18.3 | ASTM A574, ISO 4762, DIN 912 |
| Certification | Mill Cert 3.1, Dimensional Report, RoHS | Mill Cert 3.1, Dimensional Report, RoHS |
๐ Full test reports available with every shipment
๐๏ธ Real-World Applications of 1/4-20 UNC Socket Head Cap Screw
From automotive assembly lines to agricultural machinery โ proven in the field.
Automotive Powertrain Assembly
A US Tier 1 supplier replaced their previous 1/4-20 x 1/2 socket head cap screw with our 10.9 grade zinc-plated variant. Result: 37% reduction in torque rejection and 12% faster line speed.
Agricultural Machinery Frame
A German manufacturer uses our 1/4-20 UNC socket head cap screw (black oxide, 12.9 grade) for harvester subframes. Zero field failures over 18 months across 2,000+ units.
Construction Equipment Hydraulics
A Scandinavian OEM uses 1/4-20 x 1/2 socket head cap screw (stainless 316) for hydraulic valve covers. 98.7% on-time delivery over 14 consecutive shipments.
โญ What Our Customers Say About 1/4-20 UNC Socket Head Cap Screw
"We switched our entire 1/4-20 x 1/2 socket head cap screw order to Boen. 28% cost savings and no quality issues in 6 months. Their mill certs give us full traceability."
"Boen's 1/4-20 UNC socket head cap screw inventory depth is impressive. We get FOB pricing 35% below our previous supplier, and their logistics team handles all customs documentation."
"We use 1/4-20 x 1/2 socket head cap screw for our agricultural equipment assembly. Boen's consistency is unmatched โ zero rework in 4 consecutive shipments. Highly recommended."
Ethan Vance โ Senior Fastener Engineer & Supply Chain Specialist at Boen Fastener. With 14 years in industrial fasteners and export compliance, Ethan has audited over 80 factories across Asia and Europe. He regularly contributes to Fastener Technology International and Assembly Magazine. His technical guides are used by procurement teams at Fortune 500 companies.
โ Frequently Asked Questions About 1/4-20 UNC Socket Head Cap Screw
Q1: What is the difference between a 1/4-20 UNC socket head cap screw and a regular hex bolt?
A 1/4-20 UNC socket head cap screw has a cylindrical head with a hex socket drive (Allen key), allowing for higher torque application and a cleaner appearance. A standard hex bolt has external hex head and requires a wrench. SHCS is preferred for machinery, automotive, and precision assemblies where space is tight and torque consistency is critical.
Q2: What materials are available for the 1/4-20 x 1/2 socket head cap screw?
We stock 1/4-20 x 1/2 socket head cap screw in Alloy Steel 10.9 (standard, 150,000 psi), Alloy Steel 12.9 (180,000 psi), Stainless Steel 304, and Stainless Steel 316 (marine grade). Surface finishes include plain, black oxide, zinc plated, and hot-dip galvanized.
Q3: Do you provide a certificate of conformance with each shipment of 1/4-20 UNC socket head cap screw?
Yes, every shipment of 1/4-20 UNC socket head cap screw includes a Mill Certificate (EN 10204 3.1), dimensional inspection report, and RoHS/REACH compliance declaration. Third-party testing (SGS, TรV) is available upon request.
Q4: What is the minimum order quantity (MOQ) for 1/4-20 x 1/2 socket head cap screw?
For standard 1/4-20 x 1/2 socket head cap screw (alloy steel, zinc plated), MOQ is 5,000 pieces. For stainless steel or custom finishes, MOQ is 10,000 pieces. Sample orders (200 pcs) are available for qualified buyers.
Q5: How do you handle shipping and customs for international orders?
We offer FOB, CIF, CNF, and DDP terms. For 1/4-20 UNC socket head cap screw orders to the US/EU, we typically ship via FCL or LCL with full customs documentation. Average transit time: 18โ25 days to US West Coast, 22โ30 days to EU.
Q6: Can you customize the packaging or apply private labeling for our brand?
Absolutely. We offer private-label packaging for 1/4-20 x 1/2 socket head cap screw including custom boxes, polybags with barcode, and color-coded trays. We also support ERP-integrated labelling and VMI (Vendor Managed Inventory) programs for long-term contracts.
Q7: What is the lead time for a custom 1/4-20 UNC socket head cap screw with a special length?
Custom lengths (e.g., 1.25", 1.75", 2.5") for 1/4-20 UNC socket head cap screw typically require 15โ20 working days after material confirmation. We can expedite to 10 days for urgent orders with a 15% surcharge.
Q8: What payment terms do you offer for first-time buyers?
For new accounts, we accept T/T (30% deposit, 70% before shipment) or L/C at sight. After 3 successful orders, we can offer net 30 terms (credit limit up to $50,000). We also accept PayPal for sample orders.
Secure Your 1/4-20 UNC Socket Head Cap Screw Supply Chain Today
โ Free samples for qualified buyers (up to 200 pcs) ยท โ Factory audit report shared upfront ยท โ Full compliance pack with every order
๐ Hanguang Industrial Park, Yongnian District, Handan, Hebei, China ยท MonโFri 09:00โ17:00
๐ค Trusted by Engineers & Procurement Teams Worldwide
Over 200+ active B2B accounts across 30+ countries rely on Boen Fastener for their 1/4-20 UNC socket head cap screw needs.