18-8 Stainless Steel Socket Head Screw & 2.5 mm Cap Screw | Buy

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⚙️ 2026 Direct Factory Supply

18-8 Stainless Steel Socket Head Screw & 2.5 mm Cap Screw – Precision Fasteners for Industrial Buyers

🇨🇳 Buy direct from a 10+ year export factory – Eliminate middlemen, slash your TCO, and get ISO-certified 18-8 stainless steel socket head screws and 2.5 mm cap screws with full traceability.

📩 Get Free Quote in 24h 📋 Download Spec Sheet

✅ 10,000+ SKUs · ✅ 30+ countries shipped · ✅ OEM/ODM in 15 days

🏭 Boen Fastener · Hebei, China · 50,000 m² production base

📑 Contents: Pain Points Solution Tech Specs Proof FAQ Reviews Contact

⚠️ Why Procurement Managers Are Switching from Premium Brands

The 18-8 stainless steel socket head screw and 2.5 mm cap screw categories are flooded with overpriced inventory and inconsistent quality. Here’s what we hear every day from buyers like you:

💰

41% price premium

Legacy Western brands charge 30–48% more for the same 304-grade 18-8 stainless steel socket head screw. You’re paying for their logo, not better steel.

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6–8 week lead times

Waiting 2 months for a 2.5 mm cap screw batch? That’s lost production. Our factory ships 15–20 days from PO confirmation.

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Hidden quality issues

Inconsistent thread tolerances, surface passivation failure, and mixed batches of 18-8 vs 304 sub-grades. We test every melt.

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Freight cost volatility

Ocean freight from Asia to Rotterdam / LA has swung ±37% in 2025. We offer consolidated LCL and DDP terms to stabilize your landed cost.

📊 Fact: A 2025 supply chain survey by Procurement Leaders found that 63% of industrial buyers are actively diversifying fastener sources to reduce dependency on single-region suppliers. Boen Fastener is your hedge.

✅ The Boen Advantage – 18-8 Stainless Steel Socket Head Screw & 2.5 mm Cap Screw

We don’t just sell fasteners — we engineer supply chain confidence. Here’s why procurement teams from automotive, construction, and machinery choose us.

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Factory-Direct Power

Ownership of the entire production chain — from wire drawing to heat treatment. Eliminate 2–3 layers of margin on every 18-8 stainless steel socket head screw.

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ISO 9001 + CE + RoHS

Every batch of 2.5 mm cap screw is third-party tested for tensile strength, hardness, and corrosion resistance. Full mill certificate included.

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15-Day Express Production

Need 500,000 pieces of 18-8 stainless steel socket head screw in 3 weeks? Our 24/7 forging lines handle rush orders with 98% on-time delivery.

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OEM/ODM Customization

Special head marking, custom thread length, or non-standard drive? Your brand, your spec — we engineer it. 2.5 mm cap screws with custom batch codes? Yes.

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TCO Savings Report

We provide a line-item TCO comparison vs. your current supplier. Typical savings: 22–37% on landed cost for 18-8 stainless steel socket head screws.

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DDP & Consol Freight

We handle customs, duties, and last-mile delivery. One price, no surprises. USA, Europe, SEA — weekly container consolidation.

📋 Technical Specifications – 18-8 Stainless Steel Socket Head Screw & 2.5 mm Cap Screw

All data verified by Boen Fastener in-house lab + SGS third-party audit. Compliant with ASTM F837, ISO 4762, DIN 912.

Parameter	18-8 Stainless Steel Socket Head Screw	2.5 mm Cap Screw
Material Grade	AISI 304 (18% Cr + 8% Ni) / 18-8 Stainless Steel	AISI 304 (18-8) Stainless Steel
Tensile Strength	80,000 – 100,000 psi (min 550 MPa)	80,000 – 95,000 psi (min 520 MPa)
Yield Strength (0.2% offset)	30,000 – 45,000 psi (210 MPa)	28,000 – 40,000 psi (195 MPa)
Hardness (Rockwell)	B70 – B90	B70 – B85
Thread Pitch	Standard UNC / UNF / Metric (as per spec)	0.45 mm (Metric fine)
Drive Type	Hex Socket (Allen Key) · Phillips · Torx	Hex Socket (Allen Key) 1.5 mm driver
Corrosion Resistance	⭐ Excellent · Pass 200h Salt Spray Test	⭐ Excellent · Pass 200h Salt Spray Test
Certifications	ISO 9001 · CE · RoHS · Reach	ISO 9001 · CE · RoHS · Reach

🔧 Application Note: The 2.5 mm cap screw is ideal for precision electronics, medical devices, and miniature assemblies where high torque in a small package is required. 18-8 stainless steel socket head screws are preferred in food-grade equipment, marine hardware, and architectural framing.

❓ Frequently Asked Questions – 18-8 Stainless Steel Socket Head Screw & 2.5 mm Cap Screw

🔹 What is the difference between 18-8 stainless steel and 304 stainless steel?

18-8 stainless steel is the generic name for the 300 series with 18% chromium and 8% nickel. AISI 304 is the most common grade of 18-8. Our 18-8 stainless steel socket head screw and 2.5 mm cap screw are both made from 304-grade with full traceability.

🔹 What is the minimum order quantity (MOQ) for 2.5 mm cap screws?

For standard 2.5 mm cap screw in 18-8 stainless steel, our MOQ is 5,000 pieces per size. For 18-8 stainless steel socket head screws in popular sizes (M4–M12), we offer stock samples with no MOQ — order as low as 100 pcs for testing.

🔹 Can you provide custom length or thread for 18-8 stainless steel socket head screws?

Absolutely. OEM/ODM is our core strength. We can customize thread length, head height, drive type, and surface finish (passivation, black oxide, PTFE). Lead time for custom 2.5 mm cap screw is typically 12–18 working days.

🔹 What payment terms do you offer for international buyers?

We accept T/T (30% deposit, 70% against BL copy), L/C at sight, and PayPal for sample orders. For established buyers, net 30–60 days can be discussed after credit evaluation. All transactions are insured.

🔹 Do you provide free samples for 2.5 mm cap screws?

Yes. We offer free stock samples for qualified buyers. You only pay for shipping (DHL/FedEx). Request via our contact form and we’ll send 5–10 pcs of 18-8 stainless steel socket head screw + 2.5 mm cap screw for evaluation.

🔹 How do you ensure quality consistency across large batches?

Every production lot undergoes SPC monitoring — dimensional checks, hardness testing, and salt spray corrosion testing. We provide inspection reports per ISO 2859-1. Third-party SGS inspection is available before shipment.

🔹 What is the typical delivery time for USA/Europe orders?

For standard 18-8 stainless steel socket head screw in stock: 5–7 days (air) or 18–22 days (sea DDP). For custom 2.5 mm cap screw: 20–25 days production + transit. We ship via MSC, Maersk, and CMA CGM weekly.

⭐ Real Reviews from Global Buyers

What our customers say about 18-8 stainless steel socket head screws and 2.5 mm cap screws.

Michael T.

Procurement Manager · German Automotive Tier 1

“We tested 3 batches of 18-8 stainless steel socket head screws from Boen. The thread consistency is better than our previous Italian supplier. We’ve now switched 70% of our volume. Cost savings of 28%.”

Elena R.

Operations Director · Dutch Industrial Machinery

“The 2.5 mm cap screws are exactly to spec. We use them in precision alignment jigs. Zero rejects out of 50,000 pieces. Fast delivery to Rotterdam — 19 days door-to-door.”

James W.

CEO · US Construction Supply, Texas

“Boen is the most responsive factory I’ve worked with. They helped us custom-mark our 18-8 stainless steel socket head screws with our company logo. Lead time was 17 days. Amazing.”

Akiko S.

Supply Chain Manager · Japanese Electronics OEM

“We were skeptical about switching from a domestic supplier. Boen’s 2.5 mm cap screw quality exceeded our expectations. The passivation layer is uniform, and they passed our 48h humidity test.”

✍️ About the Author – David Chen

Senior Technical Director at Handan Boen Fastener Manufacturing Co., Ltd. · 15+ years in fastener engineering & international trade. David has personally overseen 200+ export projects for 18-8 stainless steel socket head screws and 2.5 mm cap screws across 30 countries. He is a certified ISO 9001 lead auditor and contributes to fastener standards in the China Fastener Industry Association.