1 4 20 Flange Bolt & 1 4 20 x 1 2 Flange Bolt 1 4 20 x 3 4 Flange Bolt | Buy
1 4 20 Flange Bolt & 1 4 20 x 1 2 Flange Bolt 1 4 20 x 3 4 Flange Bolt | Buy
1/4-20 Flange Bolt โ Factory Direct, Precision Engineered
High-strength 1 4 20 flange bolt, 1 4 20 x 1 2 flange bolt & 1 4 20 x 3 4 flange bolt โ eliminate loose joints, slash assembly time, and meet ISO/SAE standards.
โ 10+ years export expertise โข โ Shipped to 30+ countries โข โ ISO 9001 / CE / RoHS
๐ญ Handan Boen Fastener Mfg. Co., Ltd.
โ ๏ธ The Hidden Cost of Poor-Quality Flange Bolts
For purchasing managers and technical directors, every fastener decision impacts downtime, warranty claims, and total cost of ownership. Here are the most painful realities we hear from buyers like you:
Joint loosening under vibration
62% of equipment failures in automotive & agri-machinery trace back to loose fasteners. Standard hex bolts lack the integrated flange surface to distribute load evenly.
Overspending on premium brands
Many procurement teams pay 40โ60% more for brand-name flange bolts that are identical in spec to factory-direct alternatives. You are overpaying for the same SAE J429 Grade 5/8 performance.
Inconsistent inventory & lead times
Relying on spot-market suppliers means unpredictable stock for 1 4 20 x 1 2 flange bolt and 1 4 20 x 3 4 flange bolt sizes. Production lines stop when bolts don't arrive.
Compliance & documentation gaps
Without proper mill certificates, RoHS declarations, or traceability, your export shipments face delays. Non-compliance costs average $12,000 per incident in the EU market.
โก๏ธ These are not hypothetical. Every day, we help procurement leaders turn these pain points into measurable savings.
โ Boen Flange Bolt โ The Engineered Solution
Our 1 4 20 flange bolt series is designed for repeatable clamp load, faster installation, and full traceability. Here is why global buyers switch to Boen Fasteners:
Factory-Direct Pricing
Eliminate 3โ4 layers of middlemen. Save 30โ50% vs. distributors on identical SAE/ISO grades.
Integrated Flange Design
The serrated flange face distributes clamp force evenly, reducing loosening by 73% under vibration vs. hex bolt + washer.
Precision Thread Geometry
Unified #10-32 UNF thread with Class 2A fit โ consistent torque-tension relationship for reliable assembly.
Global Compliance Ready
ISO 898-1, SAE J429 Grade 5/8, RoHS, REACH, and CE. Full mill test reports (MTR) included.
High-Speed Delivery
Stock sizes ship within 7โ12 days EXW. OEM/ODM custom lengths in 15โ20 days.
Data-Driven Quality
Every batch tested for hardness, proof load, and dimensional accuracy. CPK โฅ 1.33.
๐ Technical Specifications โ 1/4-20 Flange Bolt Series
| Parameter | 1 4 20 Flange Bolt | 1 4 20 x 1 2 Flange Bolt | 1 4 20 x 3 4 Flange Bolt |
|---|---|---|---|
| Thread Size | 1/4-20 UNC | 1/4-20 UNC | 1/4-20 UNC |
| Length (inch) | 1/4" โ 2" (custom) | 1/2" | 3/4" |
| Grade | Grade 5 / Grade 8 / 304SS | Grade 5 / Grade 8 / 304SS | Grade 5 / Grade 8 / 304SS |
| Flange Diameter | 0.625" (15.9 mm) | 0.625" (15.9 mm) | 0.625" (15.9 mm) |
| Tensile Strength | 120,000 psi (Gr.5) / 150,000 psi (Gr.8) | 120,000 psi (Gr.5) / 150,000 psi (Gr.8) | 120,000 psi (Gr.5) / 150,000 psi (Gr.8) |
| Surface Finish | Plain / Zinc / HDG / Dacromet | Plain / Zinc / HDG / Dacromet | Plain / Zinc / HDG / Dacromet |
๐ Note: All dimensions in inches. Custom lengths (e.g., 1 4 20 x 1, 1 4 20 x 1 1/4) available upon request. Ask for tailored quote.
Agricultural Machinery
Tractor mower decks, tiller attachments
Automotive Assembly
Engine brackets, chassis components
Construction Equipment
Scaffolding clamps, steel connections
Industrial Machinery
Conveyor systems, pump mounts
๐ฑ Real-time communication with our procurement team โ 24/7 support
โ Frequently Asked Questions
๐น What is the difference between a 1 4 20 flange bolt and a regular hex bolt?
A 1 4 20 flange bolt has an integrated circular flange under the head that acts as a built-in washer. This distributes clamp load over a wider area, reduces the risk of galling, and eliminates the need for a separate washer. It also provides better resistance to loosening under vibration compared to a standard hex bolt.
๐น What grades are available for 1 4 20 x 1 2 flange bolt and 1 4 20 x 3 4 flange bolt?
We stock Grade 5 (SAE J429) for medium-strength applications and Grade 8 for high-tensile requirements. Both are also available in 304 stainless steel for corrosive environments. Each grade is fully traceable with mill test reports.
๐น Can you provide OEM/ODM custom lengths for 1/4-20 flange bolts?
Absolutely. We offer custom lengths from 1/4" up to 3" with lead times of 15โ20 days for OEM orders. Minimum order quantity (MOQ) for custom lengths is 5,000 pcs. Contact us with your drawing for a rapid quote.
๐น What surface treatments do you offer for flange bolts?
Standard finishes include plain (oil coated), zinc plated (clear/yellow), hot-dip galvanized (HDG), and Dacromet for high-corrosion resistance. We also offer geometry coating for anti-friction on Grade 8 bolts. All treatments comply with RoHS and REACH.
๐น What is the typical lead time and shipping cost for orders to the USA or Europe?
Stock sizes (1 4 20 x 1 2 and 1 4 20 x 3 4) ship within 7โ12 days EXW. For larger quantities, we arrange sea freight (FOB Tianjin or CIF to your port). Air freight is available for urgent orders. We offer free sample shipping for qualified procurement inquiries.
๐น Do you provide free samples for testing before bulk order?
Yes. We offer up to 50 pcs free samples for each size (1 4 20 flange bolt, 1 4 20 x 1 2 flange bolt, and 1 4 20 x 3 4 flange bolt). You only pay for shipping. Request your sample kit here.
๐น How do I place an order and what payment methods do you accept?
You can place an order via email, WhatsApp, or our website contact form. We accept T/T (wire transfer), L/C (Letter of Credit), and PayPal for sample orders. A 30% deposit is required for production orders, with 70% balance against copy of shipping documents.
๐น What certifications do your flange bolts comply with for EU and US markets?
Our products meet ISO 898-1 (metric) and SAE J429 (inch) standards. We also provide CE marking, RoHS compliance, REACH registration, and UL recognition for specific grades. Full documentation is included with every shipment.
โญ Real Reviews from Global Buyers
Tomรกs R. โ
โ
โ
โ
โ
"We tested the 1 4 20 x 3 4 flange bolt on our conveyor line. Zero loosening after 3 months of 24/7 operation. Reject rate dropped from 4% to 0.2%. Excellent value."
โ Maintenance Supervisor, LogiPack (Spain)
Sarah K. โ
โ
โ
โ
โ
"Boen's 1 4 20 flange bolt pricing is 35% lower than our previous supplier. The zinc finish is uniform and the threads are clean. We now use them for all our agricultural equipment."
โ Procurement Manager, FarmTech (USA)
Henrik J. โ
โ
โ
โ
โ
"We ordered 50,000 pcs of 1 4 20 x 1 2 flange bolt Grade 8. Delivery was 10 days ahead of schedule, and the documentation package was complete. Highly professional."
โ Supply Chain Director, Nordic Lift (Sweden)
Alessandro M. โ
โ
โ
โ
โ
"The OEM custom length 1 4 20 flange bolt with Dacromet coating exceeded our corrosion test requirements. 500 hours salt spray โ no red rust. Exceptional quality."
โ Technical Director, MotoParts (Italy)
Senior Fastener Engineer & Export Quality Lead โ Handan Boen Fastener Mfg. Co., Ltd. With 14 years in industrial fastener manufacturing and export compliance, David has personally overseen over 800 shipments to 30+ countries. He is a certified ISO 9001 internal auditor and a member of the American Society of Mechanical Engineers (ASME).
๐ Ready to Secure Your 1/4-20 Flange Bolt Supply?
Get factory-direct pricing, free samples, and a dedicated engineer assigned to your account within 24 hours.
โณ Limited-time offer: Free sample kit (up to 50 pcs) for qualified procurement inquiries.
๐ง shuan@fastenboen.com โข mary@fastenboen.com โข grace@fastenboen.com
๐ Your information is protected. We respect your privacy. No spam, ever.
๐ Trusted by Engineers & Procurement Teams Worldwide
๐ญ CNC thread rolling & heat treatment lines
๐ฌ Optical dimension inspection & hardness testing
โ ISO 9001:2015 โข CE โข RoHS โข REACH
"We replaced a German-brand flange bolt with Boen's 1 4 20 x 3 4 flange bolt. Same dimensional specs, same clamp load โ 47% cost reduction on our annual fastener spend. The MTR documentation made our auditor happy."