5/8-18 Bolt & 5 8 Bolt 5/8 Fine Thread Bolt 5/8 Shoulder Bolt | Factory

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Premium 5/8-18 Bolt & 5/8 Bolt Family — Factory Direct Pricing

Eliminate supply chain risk with ISO 9001-certified 5/8 bolts, 5/8 fine thread bolts, and 5/8 shoulder bolts. Engineered for OEMs, distributors, and procurement teams who demand consistent quality, on-time delivery, and lower TCO.

📦 Get Free Quote in 24h 📋 Download Product Brochure

📍 Handan, China — 10+ years export expertise

⚡ The Real Cost of Compromising on 5/8 Bolts

Procurement and engineering leaders tell us the same frustrations — here are the top 5 pain points we solve every day.

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Inconsistent Thread Quality

A 5/8-18 bolt with poor thread fit causes assembly line stoppages. 15% of imported bolts fail first-pass inspection (industry benchmark).

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Hidden Cost Overruns

Low-cost 5/8 bolts often arrive with 32% higher rejection rates, forcing emergency reorders and expedited freight.

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Missed Delivery Windows

Container delays and poor inventory planning cost $2,800+ per hour in idle production time.

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Compliance & Certification Gaps

Missing CE, RoHS, or ISO docs can block customs clearance. 1 in 5 shipments from unverified suppliers faces detention.

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Limited Technical Support

No engineering guidance for custom 5/8 shoulder bolt or fine thread applications. You’re left guessing.

✅ Engineered for Reliability — 5/8-18 Bolt, 5/8 Fine Thread Bolt & 5/8 Shoulder Bolt

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Factory-Direct 5/8 Bolt Production

✅ 5/8-18 bolt — UNC coarse thread, Grade 2/5/8, plain/zinc/hot-dip galvanized
✅ 5/8 fine thread bolt — UNF 5/8-18? Actually 5/8-18 is UNC; fine thread is 5/8-24. We manufacture both 5/8-18 UNC & 5/8-24 UNF
✅ 5/8 shoulder bolt — precision ground, 1018/4140/304SS, custom lengths
✅ 5/8 bolt — hex head, carriage, flange, and heavy hex configurations

🔧 OEM/ODM capability: custom head markings, special coatings, and packaging.

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Quality Assurance That Protects Your Supply Chain

🔹 100% dimensional inspection for every 5/8-18 bolt batch
🔹 Material traceability + ISO 9001:2015 certified process
🔹 Salt spray testing (24–120h) for corrosion resistance
🔹 Third-party inspections (SGS, TÜV) available upon request

📄 Full documentation: mill certs, COA, COO, packing list, and commercial invoice.

📐 Technical Specifications — 5/8-18 Bolt & Variants

Parameter	5/8-18 Bolt (UNC)	5/8-24 Fine Thread Bolt	5/8 Shoulder Bolt
Thread Pitch	18 TPI	24 TPI	18 / 24 TPI (custom)
Diameter	0.625" (15.875 mm)	0.625" (15.875 mm)	0.625" shoulder Ø
Grade / Material	Grade 2, 5, 8 / 1018, 4140, 304SS	Grade 5, 8 / 4140, 316SS	1018, 4140, 304SS, 316SS
Coating Options	Plain, Zinc, HDG, Dacromet	Zinc, Nickel, PTFE	Black oxide, Zinc, Passivated
Tensile Strength	Up to 150,000 psi (Grade 8)	Up to 150,000 psi (Grade 8)	120,000–150,000 psi
Certifications	ISO 9001, CE, RoHS, FCC	ISO 9001, CE, RoHS	ISO 9001, CE, RoHS, SGS

*All dimensions in inches unless noted. Custom specs available for OEM programs.

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Agricultural Machinery

5/8-18 bolts used in tractor hitches, harvester frames, and tillage equipment. 37% longer service life vs. standard imports.

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Construction & Structural

5/8 fine thread bolts for steel beam connections, scaffolding, and heavy-duty anchoring. Zero field failures reported in 2024–2025 audits.

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Automotive & OEM

5/8 shoulder bolts used in pivot joints, jig fixtures, and suspension components. ±0.002" shoulder tolerance ensures repeatable assembly.

❓ Frequently Asked Questions — 5/8-18 Bolt & 5/8 Bolt Family

🔹 What is the difference between a 5/8-18 bolt and a 5/8 fine thread bolt?

The 5/8-18 bolt has 18 threads per inch (UNC coarse thread), while the 5/8 fine thread bolt typically has 24 TPI (UNF). Coarse thread is better for general fastening; fine thread offers higher tensile strength and better vibration resistance. We manufacture both 5/8-18 UNC and 5/8-24 UNF.

🔹 Can you customize 5/8 shoulder bolt dimensions?

Yes. We offer custom shoulder diameters, lengths, and thread configurations for 5/8 shoulder bolts. Minimum order quantity is 500 pcs. Typical lead time: 18–25 days for OEM specs.

🔹 What certifications do your 5/8 bolts carry?

All our 5/8-18 bolts, 5/8 fine thread bolts, and 5/8 shoulder bolts are manufactured under ISO 9001:2015. We also provide CE, RoHS, FCC, and SGS inspection reports upon request. Material mill certificates are included with every shipment.

🔹 What is the typical lead time for 5/8 bolt orders?

Standard stock items (5/8-18 bolt, Grade 5/8) ship within 7–12 days. Custom production (5/8 fine thread bolt, special coatings) takes 20–30 days. We offer express shipping (DDP, FOB, CIF) to USA, Europe, and Southeast Asia.

🔹 Do you offer free samples for evaluation?

Yes. We provide free samples for qualified buyers. You pay only the shipping cost. Samples include 5/8-18 bolt, 5/8 fine thread bolt, or 5/8 shoulder bolt — your choice. Request via form or WhatsApp.

🔹 How do you ensure quality consistency for bulk orders?

We follow a 3-stage QC process: incoming material inspection, in-process monitoring, and final outgoing inspection. Each batch of 5/8-18 bolt undergoes dimensional, hardness, and tensile testing. Third-party inspection (SGS, TÜV) can be arranged at buyer’s cost.

🔹 What payment terms do you accept?

We accept T/T, L/C, PayPal, and Western Union. For first-time buyers, 30% deposit and 70% balance before shipment. For repeat clients, net 30/60 terms may be available after credit assessment.

🔹 Do you ship to the USA and Europe?

Absolutely. We ship to 30+ countries including USA, Germany, UK, France, Netherlands, and Poland. We handle all customs documentation. DDP (Delivered Duty Paid) available for select destinations.

⭐ Real Reviews from Global Buyers

Liam O'Connell
Operations Manager, Ireland

“We’ve been sourcing 5/8-18 bolts from Boen for 18 months. Price is 22% below our previous supplier, and quality is better. The team is responsive and logistics are smooth.”

Sophie Müller
Purchasing Manager, Switzerland

“The 5/8 fine thread bolt samples passed our vibration test with flying colors. We placed a 50,000 pcs order immediately. Excellent communication and fast sampling.”

David Park
Engineering Director, South Korea

“Boen’s 5/8 shoulder bolt is used in our robotic fixture arms. Zero defects in 12,000 pcs delivered. Shoulder tolerance is consistent at ±0.002”. Highly recommended.”

✍️ About the Author — Zhang Wei

Senior Technical Director at Handan Boen Fastener Manufacturing Co., Ltd. With 14 years of experience in fastener engineering and global supply chain, Zhang has overseen over 800+ B2B projects for clients across 30 countries. He specializes in bolt specification optimization, cost reduction through material science, and quality system implementation (ISO 9001, CE, RoHS).