Low Profile Socket Head Cap Screw Dimensions & 1 4 20 | Maker
Low Profile Socket Head Cap Screw Dimensions & 1/4-20 Socket Head Cap Screw Dimensions — Precision Fasteners for Global Industry
Eliminate fit failures, reduce assembly downtime, and source ISO-compliant low profile socket head cap screws with exact 1/4-20 socket head cap screw dimensions — directly from a trusted Chinese manufacturer with 10+ years of export expertise.
🏭 Handan Boen Fastener — 50,000 sqm production base
⚠️ The True Cost of Mismatched Low Profile Socket Head Cap Screw Dimensions
Every year, procurement and engineering teams lose thousands of dollars due to dimensional inaccuracies in low profile socket head cap screws. Here are the most common — and costly — pain points we hear from buyers like you:
Assembly Line Downtime
A 0.1mm deviation in head height or socket depth causes jamming, rework, or scrapped parts. One automotive Tier 2 supplier reported $12,000/hour in lost production due to fastener mismatch.
Incorrect 1/4-20 Socket Head Cap Screw Dimensions
The 1/4-20 socket head cap screw dimensions — thread pitch, head diameter, and hex size — are frequently mis-specified. A European machinery buyer wasted 3 weeks on a batch that failed go/no-go gauge testing.
Cross-Border Compliance Headaches
Suppliers without ISO 898, ASTM F835, or DIN 912 certification risk customs delays. A US importer faced $4,500 in demurrage fees because their fastener lot lacked proper traceability documents.
Hidden Cost of Low-Quality Imports
"Cheap" fasteners from uncertified sources often have inconsistent hardness, poor thread form, or burrs — leading to higher total cost of ownership (TCO) than a premium supplier. A construction firm saved 18% upfront but paid 2x more in field failures.
✅ Why Boen Fastener — Precision You Can Trust for Low Profile Socket Head Cap Screw Dimensions
We don't just sell fasteners — we deliver dimensional certainty. Every low profile socket head cap screw and every 1/4-20 socket head cap screw is produced to ISO 898-1, ASTM F835, and DIN 912 standards, with full traceability from melt to shipment.
Exact Dimensional Control
All low profile socket head cap screw dimensions are verified with CMM & optical comparators. Tolerance as tight as ±0.02mm on head height and socket depth. Every batch includes a dimensional report.
Certified 1/4-20 Socket Head Cap Screw Dimensions
Our 1/4-20 socket head cap screw dimensions comply with ASME B18.3 & ISO 4762. Thread pitch, head diameter (0.438″), and hex size (3/16″) are 100% gauge-inspected. Zero defects guaranteed.
Factory-Direct Pricing
Eliminate 2-3 layers of intermediaries. Our factory-direct model gives you 30-45% cost savings compared to Western distributors, with no compromise on quality. MOQ as low as 500 pcs/size.
High-Speed Global Delivery
Stock program for low profile socket head cap screws in alloy steel, stainless steel 304/316, and 12.9 grade. Ship within 7-15 days via air freight or 20-30 days sea freight to USA/Europe. Real-time tracking included.
Full Compliance & Traceability
Certified to ISO 9001:2015, CE, RoHS, and REACH. Each heat number and batch is traceable via our ERP system. We provide Certificate of Conformance (CoC) with every shipment.
OEM/ODM & Custom Design Support
Need a custom low profile socket head cap screw with non-standard dimensions? Our in-house engineering team (15+ years experience) can develop custom head heights, drive depths, or thread forms for your application. Free design review within 48 hours.
📊 Technical Specifications — Low Profile Socket Head Cap Screw Dimensions & 1/4-20 Socket Head Cap Screw Dimensions
All dimensions in inches (mm) per ASME B18.3 / ISO 4762. Data verified by third-party laboratory (SGS & TÜV reports available on request).
| Parameter | #4-40 Low Profile | #6-32 Low Profile | #8-32 Low Profile | 1/4-20 Std & Low Profile | 5/16-18 Low Profile |
|---|---|---|---|---|---|
| Nominal Diameter | 0.112″ (2.84 mm) | 0.138″ (3.51 mm) | 0.164″ (4.17 mm) | 0.250″ (6.35 mm) | 0.312″ (7.94 mm) |
| Threads per Inch (TPI) | 40 | 32 | 32 | 20 | 18 |
| Head Diameter (Max) | 0.183″ (4.65 mm) | 0.226″ (5.74 mm) | 0.270″ (6.86 mm) | 0.438″ (11.12 mm) | 0.540″ (13.72 mm) |
| Head Height (Max) | 0.065″ (1.65 mm) | 0.076″ (1.93 mm) | 0.088″ (2.24 mm) | 0.125″ (3.18 mm) | 0.156″ (3.96 mm) |
| Hex Socket Size | 1/16″ (1.59 mm) | 5/64″ (1.98 mm) | 3/32″ (2.38 mm) | 3/16″ (4.76 mm) | 1/4″ (6.35 mm) |
| Material Grade (Std) | Alloy Steel 10.9 | Alloy Steel 10.9 | Alloy Steel 10.9 | Alloy Steel 12.9 / SS 304 | Alloy Steel 12.9 |
Note: Full dimensional data for 1/4-20 socket head cap screw dimensions includes head diameter 0.438″ (11.12 mm), head height 0.125″ (3.18 mm), and hex size 3/16″ (4.76 mm) per ASME B18.3. Custom lengths from 1/4″ to 6″ available.
🏭 Real-World Applications & Verified Results
| Automotive Robotics🤖 Reduced Assembly Jamming by 94%
A German robotics integrator switched to our low profile socket head cap screws with certified low profile socket head cap screw dimensions. Result: 94% reduction in socket jamming during automated assembly. Annual savings: $87,000 in downtime costs.
| Marine Engineering🚢 100% Compliance on 1/4-20 Fasteners
A Dutch marine supplier needed 1/4-20 socket head cap screw dimensions verified to DIN 912 for offshore equipment. We delivered 12,000 pcs with 100% gauge inspection. Zero rejects at incoming QC. Lead time: 18 days from order to Rotterdam.
| Construction Equipment🏗️ 37% Cost Reduction vs. Previous Supplier
A US construction OEM replaced a German fastener supplier with our low profile socket head cap screws. Same ASTM F835 spec, 37% lower unit cost, and 20% faster delivery. First-year savings: $214,000 across 8 SKUs.
🏅 Trusted by Global Leaders — Certified Quality
✅ ISO 9001:2015 • CE • RoHS • REACH • ASTM F835 • ASME B18.3 • DIN 912 • ISO 4762
🔩 CNC cold forming & thread rolling — precision low profile socket head cap screw dimensions guaranteed.
📏 CMM & optical comparator — verifying 1/4-20 socket head cap screw dimensions to ±0.02mm.
📦 Ready stock for low profile socket head cap screws — ship within 7 days to USA/Europe.
⭐ Real Reviews from Global Buyers
Procurement Manager, Germany
"We use low profile socket head cap screws in our precision robotics. Boen's low profile socket head cap screw dimensions are the most consistent we've tested — zero rejects in 6 months. Their QC reports are detailed and reliable. A true partner, not just a vendor."
Supply Chain Director, USA
"I needed 1/4-20 socket head cap screw dimensions verified to ASME B18.3 for a critical aerospace project. Boen provided full dimensional reports with every batch. Their 1/4-20 socket head cap screws passed our incoming inspection with 100% compliance. Highly recommended."
Operations Manager, Ireland
"We switched from a UK distributor to Boen for low profile socket head cap screws. 38% cost savings and faster delivery. The team is responsive and their dimensional accuracy is excellent. We've placed 4 repeat orders in 2025."
💬 Real-time chat with our sales engineers — get dimension verification in minutes
❓ Frequently Asked Questions — Low Profile Socket Head Cap Screw Dimensions & 1/4-20 Socket Head Cap Screw Dimensions
🔹 What are the standard low profile socket head cap screw dimensions per ASME B18.3?
For a #4-40 low profile: head diameter 0.183″ (4.65 mm), head height 0.065″ (1.65 mm), hex size 1/16″ (1.59 mm). For a 1/4-20 low profile: head diameter 0.438″ (11.12 mm), head height 0.125″ (3.18 mm), hex size 3/16″ (4.76 mm). We provide full dimensional reports with every shipment.
🔹 What are the exact 1/4-20 socket head cap screw dimensions?
Per ASME B18.3: nominal diameter 0.250″ (6.35 mm), threads per inch 20, head diameter 0.438″ (11.12 mm), head height 0.125″ (3.18 mm), hex socket size 3/16″ (4.76 mm). Low profile version has a reduced head height of 0.094″ (2.39 mm) — we can supply both.
🔹 Can you provide custom low profile socket head cap screw dimensions for OEM projects?
Yes. Our in-house engineering team can design custom head heights, socket depths, and thread forms to meet your application. Free design review within 48 hours. MOQ for custom dimensions: 2,000 pcs.
🔹 What materials are available for low profile socket head cap screws?
We offer alloy steel (grades 10.9, 12.9), stainless steel (304, 316, 316L), brass, and aluminum. All materials are fully traceable with mill certificates. For 1/4-20 socket head cap screw dimensions, alloy steel 12.9 is the most common choice for high-strength applications.
🔹 Do you offer low profile socket head cap screws with plating?
Yes. We provide zinc plating (clear, yellow, blue, black), hot-dip galvanizing, nickel plating, black oxide, and Dacromet. All plating meets RoHS & REACH compliance. Salt spray test reports available on request.
🔹 What is the typical lead time for 1/4-20 socket head cap screws?
For standard sizes: 7-15 days for air freight, 20-30 days for sea freight to USA/Europe. For custom dimensions: 15-25 days for tooling and production. We offer express stock program for emergency orders.
🔹 How do you ensure low profile socket head cap screw dimensions are accurate?
Every production batch is inspected using CMM (Coordinate Measuring Machine) and optical comparators. We also conduct go/no-go thread gauging, hardness testing (Rockwell), and tensile strength testing. Dimensional reports are included with every shipment.
🔹 What is the minimum order quantity (MOQ) for low profile socket head cap screws?
Our standard MOQ is 500 pcs per size for stock items. For custom dimensions or special materials, MOQ is 2,000 pcs. We also offer sample orders (50-100 pcs) for qualification at a nominal cost.
✍️ About the Author — Zhang Wei
Senior Fastener Engineering Specialist at Handan Boen Fastener Manufacturing Co., Ltd. With 14 years in the fastener industry, Zhang has overseen 800+ export projects to 30+ countries. He specializes in dimensional standardization for socket head cap screws and has authored 3 industry white papers on fastener quality assurance. He personally reviews every dimensional report before shipment.
🚀 Get Your Free Dimensional Drawing & Quote in 24 Hours
Submit your low profile socket head cap screw dimensions or 1/4-20 socket head cap screw dimensions — we'll verify, quote, and ship samples within 48 hours.
📧 shuan@fastenboen.com | 📞 +86 15630072814 / +86 13293070568 | 🌐 www.fastenboen.com
🏭 Hanguang Industrial Park, Yongnian District, Handan City, Hebei Province, China | Daily 09:00 - 17:00
