Stainless Steel Flat Head Cap Screws & Socket Cap | Factory
Eliminate supplier markups. Premium A2/A4 stainless steel flat head socket cap screws engineered for corrosive environments, high-vibration assemblies, and demanding OEM specs. Factory-direct pricing โ 30%+ savings vs. distributors.
๐ +86 15630072814 ย |ย ๐ง shuan@fastenboen.com

๐ฎ Handan Boen Fastener โ Factory View
Procurement and engineering leaders tell us the same story โ here are the five pain points that erode your margins and reputation.
A 2025 supply chain survey found 23% of procurement teams exceed fastener budgets due to inconsistent pricing from multi-tier distributors.
Low-grade stainless steel flat head cap screws can pit within 6 months in marine or chemical environments โ rework costs 3x the original fastener price.
Relying on spot-market imports? 42% of buyers report at least 2-week delays per order, causing production line stoppages (source: 2026 Global Trade Report).
Inconsistent thread pitch, head height, or drive type on stainless steel flat head socket cap screws can fail ISO/DIN inspections โ leading to rejected shipments.
Most buyers only see unit price โ but TCO includes inspection, reorder admin, expedited freight, and warranty claims. Often 37% higher than a direct factory partnership.
โ You need a partner who owns the entire process โ from melt to finished stainless steel flat head cap screws.
We don't just sell stainless steel flat head socket cap screws โ we deliver consistency, traceability, and speed that protects your supply chain.
Over a decade serving 30+ countries โ we understand ANSI, DIN, ISO, and JIS standards.
A2 (304) and A4 (316L) stainless steel mill certificates โ every batch is documented.
15-25 days for standard orders; express service available for urgent production lines.
Custom head markings, packaging, and even non-standard drive configurations โ we adapt.
No middlemen. Save 30-45% compared to traditional distribution channels.
| Parameter | Details |
|---|---|
| Material Grade | A2-70 (304), A4-80 (316L), Martensitic 410 |
| Size Range | M2 โ M20 (inch: #4 โ 3/4") |
| Thread Standard | ISO 7380-1, DIN 7991, ANSI B18.3 |
| Drive Type | Hex socket (Allen), Torx, Phillips, Pozidriv |
| Head Angle | 82ยฐ (inch), 90ยฐ (metric) โ countersunk flat head |
| Surface Finish | Passivated, bright, electropolished, or black oxide |
| Certifications | ISO 9001:2025, CE, RoHS, Reach, SVHC-free |
| Packing Options | Bulk (25kg cartons), retail boxes, poly bags, custom labeling |
A4-80 stainless steel flat head cap screws for handrails, decking, and offshore structures โ salt-spray tested to 1000+ hours.
High-torque socket cap screws for battery packs, motor housings, and chassis components โ with full batch traceability.
Passivated A2 screws with smooth surfaces โ no crevices for bacterial growth, compliant with HACCP/GMP guidelines.
Solar trackers, wind turbine cabinets โ our flat head socket cap screws withstand UV, thermal cycling, and vibration.
Q: What grades of stainless steel flat head cap screws do you offer?
A: We stock A2-70 (304), A4-80 (316L), and 410 martensitic. All with mill certificates. For food/pharma we also offer electropolished finish.
Q: Can you manufacture custom stainless steel flat head socket cap screws?
A: Absolutely. We offer OEM/ODM for non-standard lengths, head diameters, drive types, and marking. MOQ starts from 5000 pcs for M6 and above.
Q: What is the typical lead time for a standard order?
A: 15-25 working days for standard sizes and finishes. For urgent lines, we can expedite to 10-12 days with a small surcharge. We also keep fast-moving SKUs in stock for immediate shipment.
Q: Do you provide free samples for evaluation?
A: Yes. We offer free samples for standard sizes (you pay shipping). For custom specs, a small tooling fee applies โ refundable with first order.
Q: How do you ensure quality consistency across large volumes?
A: We follow ISO 9001:2025 with in-house hardness testing, thread gauging, and dimensional inspection. A Certificate of Conformance is included with every shipment. Third-party inspection (SGS, TรV) is also available.
Q: What shipping methods do you use for USA/Europe?
A: We ship via FOB Tianjin or Shanghai, CIF to major ports (Rotterdam, Hamburg, Long Beach, Houston). Express (DHL, FedEx) for small parcels. We also offer DDP terms for qualified buyers.
Q: What is your payment policy for first-time international buyers?
A: Typically T/T (30% deposit, 70% against BL copy) or L/C at sight. For established relationships, we can discuss open terms. We also accept PayPal for sample orders.
Real feedback from procurement and engineering leaders across three continents.
โWe tested stainless steel flat head cap screws from three suppliers. Boen won on dimensional accuracy and surface finish. Our rejection rate dropped from 4% to 0.2%.โ
โ Tom W., Midwest Industrial SupplyโBoen's A4 stainless steel flat head socket cap screws are perfect for our offshore wind projects. Fast delivery, great communication, and the price is right.โ
โ Elena V., NorthSea Energy GmbHโWe've been buying from Boen for 3 years. Their quality is consistent, and they always help us optimize packaging to reduce freight costs. A true partner.โ
โ Carlos D., Grupo Ferretero MX
David Lin is a senior fastening engineer and export manager at Handan Boen Fastener Manufacturing Co., Ltd. With 12 years in the industrial fastener industry, he has helped over 150 buyers across 30+ countries specify and source the right stainless steel fasteners for demanding environments. He regularly contributes to the Fastener Technology International forum and holds certifications in metallurgy and supply chain management.

๐ฌ Live conversations with our procurement partners โ real-time support.
Get factory-direct pricing on premium stainless steel flat head cap screws and socket cap screws. Free samples for qualified buyers.
๐ง shuan@fastenboen.com ย |ย ๐ +86 15630072814 ย |ย ๐ +86 13293070568
๐ Hanguang Industrial Park, Yongnian District, Handan, Hebei, China ย |ย MonโFri 09:00โ17:00
๐ข Trusted by 300+ Industrial Brands Worldwide
โ We switched to Boen for our stainless steel flat head socket cap screws and cut fastener spend by 34% while improving on-time delivery from 72% to 96%.โ
โ The A4-80 flat head cap screws from Boen passed our 1500h salt spray test โ zero pitting. Their technical support and material certs made our auditor happy.โ
โ OEM custom packaging + mixed container loading โ Boen makes it easy. We've scaled from 2 SKUs to 18 without any quality drift.โ