Premium 1/2 Inch Bolt & 1/4-20, 1/4-24, 1/4-28 Bolts
Factory-Direct Pricing for Industrial Buyers

Reduce fastener costs by up to 37% with ISO-certified, high-strength bolts engineered for automotive, agricultural, and construction applications. Trusted by 30+ countries worldwide.

✓ Free samples available ✓ OEM/ODM supported ✓ 10-15 day delivery

Inflated Prices

Traditional distributors add 25-40% markup. You pay for their inventory, not your value.

Inconsistent Quality

Batch-to-batch variation in 1/4-20 bolt and 1/4-24 bolt threads leads to assembly failures & rework costs.

Shipping Delays

Long lead times (6-10 weeks) from overseas suppliers disrupt production schedules.

Compliance Risks

Non-certified fasteners risk project rejection. CE, ISO 9001, RoHS compliance is non-negotiable in 2026.

Powerful Factory

30,000 sqm facility with 200+ automated CNC machines. Annual output 50,000+ tons of fasteners.

Quality Assurance

ISO 9001, CE, RoHS certified. 100% thread inspection for every 1/4-20 bolt and 1/4-24 bolt batch.

OEM/ODM Design

Custom head markings, thread lengths, and coatings. Your 1/2 inch bolt specs, your brand.

High-Speed Delivery

10-15 days for standard orders. Express logistics available for urgent 1/4-28 bolt requirements.

"We switched to Boen for our 1/4-20 bolt supply. Cost reduced by 32% and zero defects in 6 months."

David Müller Procurement Manager, Germany

"The 1/2 inch bolt Grade 8 we ordered for our trailer line exceeded ASTM specs. Delivery was 12 days."

Sarah Chen Operations Director, USA

"Consistent quality on 1/4-24 bolt and 1/4-28 bolt runs. Our engineers are impressed."

James Okafor Technical Director, Nigeria

What is the difference between a 1/4-20 bolt and a 1/4-28 bolt?

The 1/4-20 bolt has 20 threads per inch (coarse), while the 1/4-28 bolt has 28 threads per inch (fine). Fine threads offer better vibration resistance and higher tensile strength in thin-walled materials. Coarse threads are easier to assemble and better for soft materials.

What grade should I choose for a 1/2 inch bolt in structural applications?

For structural and high-stress applications, we recommend Grade 8 (1/2 inch bolt) with 150,000 psi minimum tensile strength. Grade 5 (120,000 psi) is suitable for automotive and machinery. Our team can help you select the right grade based on your load requirements.

Do you offer OEM/ODM customization for bolt head markings?

Yes. We provide custom head markings, thread lengths, and coatings for 1/4-20 bolt, 1/4-24 bolt, 1/4-28 bolt, and 1/2 inch bolt. Minimum order quantity for OEM is 5,000 pieces per specification. Send us your drawing or sample for a quote.

What are your typical lead times and shipping costs?

Standard production takes 10-15 days. Express delivery (5-7 days) is available for urgent orders. We offer free freight for orders above $5,000 (FOB Tianjin/Qingdao). Shipping costs to USA/Europe average $200-$800 depending on volume and weight.

Do you provide free samples for testing?

Absolutely. We offer free samples of any 1/4-20 bolt, 1/4-24 bolt, 1/4-28 bolt, or 1/2 inch bolt. You only pay the shipping cost. Samples are dispatched within 48 hours. Request yours today.

How do you ensure quality consistency across large batches?

We follow a strict 3-stage QC process: incoming material inspection, in-process thread gauging, and final dimensional/mechanical testing. Every batch of 1/4-20 bolt and 1/2 inch bolt comes with a mill test certificate (MTC) upon request.

What payment terms do you accept for international buyers?

We accept T/T (30% deposit, 70% before shipment), L/C at sight, and PayPal for small orders. For long-term contracts, we can negotiate net 30/60 terms after credit evaluation. All payments are protected by secure banking channels.

Anna Kowalski Supply Chain Manager, Poland

"We've been using Boen's 1/4-20 bolt and 1/4-24 bolt for our agricultural line. The consistency is outstanding — zero returns in 12 months. Their team is also very responsive to our urgent requests."

Michael Torres Operations Manager, Mexico

"The 1/2 inch bolt Grade 8 we ordered exceeded our tensile strength requirements. Delivery was 11 days — faster than our local supplier. We're now expanding our order to include 1/4-28 bolt for precision assemblies."

Elena Petrova Technical Director, UAE

"Boen's OEM service for 1/4-20 bolt with custom head stamping was seamless. The samples matched our drawings perfectly. Highly recommended for companies that need both quality and customization."