4x12mm Round Head Screw & 6-32 Button Head Cap Screw | Factory
4x12mm Round Head Screw & 6-32 Button Head Cap Screw โ Factory Direct
โ๏ธ Eliminate sourcing hassle & reduce per-unit cost by 18โ30% with precision-engineered metric & unified fasteners, backed by ISO 9001 quality & 10+ years export expertise.
๐บ๐ธ ๐ช๐บ Trusted by purchasing managers & technical directors in 30+ countries โ automotive, agriculture, construction & industrial machinery.
๐ Table of Contents
โ ๏ธ The Hidden Cost of โCheapโ Fasteners
Every procurement manager knows the feeling: a supplier promises โlowest priceโ but delivers inconsistent threads, brittle heads, or wrong dimensions. The result? Assembly line stoppages, field failures, and emergency air freight costs.
Inconsistent Thread Fit
42% of rejected shipments in 2025 were due to pitch/OD variance. Your torque specs become guesswork.
Hidden Shipping & Tariff Shock
Many offshore suppliers add 15โ25% surcharges for small orders. Landed cost often exceeds budget.
No Technical Support
Need a custom head style or material cert? Most suppliers canโt (or wonโt) respond within 48h.
Zero Traceability
No batch number, no material cert, no RoHS report. Your QC team wastes hours auditing.
โ Boen Fasteners solves this. Factory-direct pricing, full traceability, and ISO 9001 + CE + RoHS compliance โ every batch.
๐ง Precision Fasteners Engineered for Industrial Performance
The 4x12mm round head screw (metric) and the 6-32 button head cap screw (unified #6-32) are two of the most requested fasteners in assembly, automotive, and appliance manufacturing. Hereโs how our factory delivers consistent quality, on-time delivery, and cost savings.
Factory-Direct Pricing
Eliminate middlemen. Save 18โ30% vs. distributors. Volume discounts on 50k+ pieces.
Precision to ยฑ0.05mm
CNC-controlled cold heading & thread rolling. DIN 85 / ISO 1207 for metric, ASME B18.6.3 for unified.
Global Logistics
7โ15 days for standard orders. DDP / FOB / CIF terms available. Full tracking & customs support.
๐ Technical Specification Comparison
| Parameter | 4x12mm Round Head Screw | 6-32 Button Head Cap Screw |
|---|---|---|
| Thread Standard | Metric โ M4 x 0.7 (ISO 261) | Unified โ #6-32 UNC (ASME B1.1) |
| Head Type | Round Head (dome) โ DIN 85 / ISO 1207 | Button Head (low-profile) โ ASME B18.6.3 |
| Diameter (nominal) | 4.0 mm | #6 = 3.505 mm (0.1380 in) |
| Length (nominal) | 12 mm | 3/8 in โ 1 in (custom lengths available) |
| Material Options | Carbon steel (4.8/8.8), SS 304/316, Brass | Alloy steel (10.9/12.9), SS 304/316, 410 SS |
| Finish / Coating | Zinc plated (clear/yellow), black oxide, hot-dip galvanized, plain | Zinc plated, black oxide, passivated, PTFE, phosphate |
| Drive Type | Slotted, Phillips, Pozidriv, Torx (custom) | Hex socket (Allen), Torx, Phillips |
| Tensile Strength (min) | 800 MPa (grade 8.8) / 500 MPa (grade 4.8) | 1,040 MPa (grade 10.9) / 1,220 MPa (grade 12.9) |
| Certifications | ISO 9001, CE, RoHS, REACH | ISO 9001, CE, RoHS, REACH, IATF 16949 (auto) |
| Packing | Bulk 25kg cartons, poly bags, customer-labeled boxes, heat-sealed packs | Bulk 25kg cartons, poly bags, customer-labeled boxes, heat-sealed packs |
๐ฌ All dimensions verified by digital optical comparator & thread plug gauges โ batch test reports included.
Agricultural Machinery
The 4x12mm round head screw is widely used in harvester guards, conveyor covers, and ventilation panels. Our zinc-plated carbon steel version provides 500h+ salt spray resistance.
Automotive Sub-Assemblies
The 6-32 button head cap screw is specified for brake controller brackets, interior trim modules, and electronic enclosures. Grade 10.9 alloy steel ensures vibration resistance under dynamic loads.
Construction Fixtures
Both screws are used in light steel framing, handrail brackets, and electrical junction boxes. Hot-dip galvanized option available for outdoor corrosion resistance.
Appliance & Electronics
The low-profile button head of the 6-32 screw is ideal for PCB mounting, panel covers, and rack systems where clearance is tight. Stainless steel 304 for hygienic & cleanroom environments.
โ Frequently Asked Questions
๐น What is the difference between a 4x12mm round head screw and a 6-32 button head cap screw?
The 4x12mm round head screw is a metric fastener (M4 x 0.7 thread, 12mm length) with a dome-shaped head, commonly used in agricultural and construction applications. The 6-32 button head cap screw is a unified #6-32 UNC thread with a low-profile cylindrical head, ideal for automotive and electronics assemblies where clearance is limited.
๐น Do you offer custom lengths or head styles for these screws?
Yes. We support OEM/ODM customization for both products. You can specify length, head diameter, drive type (Torx, hex, Phillips, etc.), material grade, coating, and packaging. Minimum order quantity for custom specs is typically 10,000โ20,000 pieces, depending on complexity.
๐น What certifications do you provide with shipments?
Every shipment includes ISO 9001:2015 compliance, CE declaration, RoHS & REACH reports. For automotive-grade orders, we also provide IATF 16949 certificates and batch traceability numbers. Material test reports (MTR) are available upon request.
๐น What are your typical lead times and shipping terms?
Standard stock items: 7โ12 days. Custom orders: 15โ25 days. We offer FOB (Tianjin/Qingdao), CIF, DDP, and EXW terms. For urgent orders, express shipping (DHL/FedEx) is available at 3โ5 days. We handle all export documentation.
๐น Can I get free samples before placing a bulk order?
Absolutely. We provide free samples (up to 20 pieces per type) for qualified buyers. You only pay for shipping. Samples are dispatched within 48 hours with full dimensional and material data.
๐น What is your minimum order quantity (MOQ) for standard 4x12mm round head screws?
For standard carbon steel versions, MOQ is 10,000 pieces. For stainless steel, MOQ is 5,000 pieces. We can accommodate smaller trial orders for new customers โ please contact our sales team.
๐น How do you ensure quality consistency for the 6-32 button head cap screw?
We use CNC cold heading machines with real-time optical inspection. Every batch is tested for hardness (Rockwell), tensile strength, thread pitch (go/no-go gauges), and coating thickness (XRF). A Certificate of Conformance is included with every delivery.
๐น Do you offer after-sales technical support?
Yes. Our engineering team provides free technical consultation on fastener selection, torque specs, and corrosion resistance. We respond to all inquiries within 24 hours (typically within 4 hours during business hours).
โ๏ธ About the Author โ Li Wei
Senior Fastener Engineer & Export Specialist, 12+ years in industrial fasteners
Li Wei leads the technical product team at Handan Boen Fastener Manufacturing Co., Ltd. He has overseen 400+ export projects to Europe, North America, and Southeast Asia, specializing in metric & unified thread standards, material selection, and coating optimization. He is a regular contributor to Fastener + Fixing Magazine and holds a degree in Mechanical Engineering from Hebei University of Technology.
๐ Ready to Secure Your Fastener Supply Chain?
Limited-time offer: Free sample kit + 5% discount on first order over 50,000 pieces. Offer valid until April 30, 2026
โ Risk-free: 100% quality guarantee or full replacement โข Free samples โข DDP terms available
๐ Hanguang Industrial Park, Yongnian District, Handan, Hebei, China โข Daily 09:00 โ 17:00
๐ Trusted by Engineering Teams Worldwide
๐ Supplying Leading Brands & OEMs
โWe switched to Boen for our 4x12mm round head screws and cut per-unit cost by 22%. Thread consistency is excellent โ zero rejects in the last 6 shipments.โ
โThe 6-32 button head cap screw samples arrived in 5 days with full material certs. Our engineers loved the precise head height. Repeat order placed within 2 weeks.โ
โBoenโs OEM/ODM capability saved us 3 weeks of lead time. We now use their 4x12mm round head screws across 3 assembly lines. Highly recommend.โ
โWe tested 6-32 button head cap screws from 5 suppliers. Boenโs tensile strength exceeded spec by 12%. Now our standard.โ