304 Stainless Steel Expansion Eye Bolts
Our 304 Stainless Steel Expansion Eye Bolts (lifting eye expansion anchors) are heavy-duty, corrosion-resistant fasteners engineered for permanent load-bearing applications. Manufactured from premium-grade 304 stainless steel, these expansion bolts combine a threaded eye bolt with a split expansion sleeve, creating a secure, pull-out resistant anchor in concrete, brick, or masonry.
Available in thread sizes M6 to M20, sleeve outer diameters 10mm to 25mm, and overall lengths 50mm to 300mm — over 100 combinations. Perfect for swing sets, hammocks, outdoor lighting, marine rigging, and industrial lifting. The polished finish and precision-machined eye provide a reliable attachment point for ropes, chains, and carabiners.
🎬 Installation demo · Expansion mechanism
📐 Key Specifications
| Product Name | 304 Stainless Steel Expansion Eye Bolts |
| Material | 304 stainless steel (eye bolt, expansion sleeve, nut, and washer) |
| Surface Finish | Polished |
| Available Sizes | Thread diameters: M6, M8, M10, M12, M14, M16, M18, M20 Sleeve outer diameters: 10mm,12mm,14mm,16mm,18mm,20mm,22mm,25mm Lengths: 50mm-300mm (over 100 combinations) |
| Working Principle | Expansion sleeve grips masonry when nut is tightened, creating mechanical interlock |
| Key Features | Corrosion-resistant, load-bearing eye design, vibration-resistant hold, one-time installation |
| Compatible Base Materials | Concrete, brick, block masonry, stone |
| Packaging & MOQ | Standard bulk packaging | MOQ: 10 pieces | Lead Time: 3-7 days |
| OEM/ODM | Custom sizes, lengths, and configurations available |
📦 Wide Size Range for Diverse Applications
With over 100 size combinations, these bolts can accommodate different base material thicknesses, load requirements, and installation depths. From small M6 bolts for light fixtures to heavy-duty M20 bolts for industrial lifting, there is a size for every project. The image on the right shows the variety of sleeve diameters, thread sizes, and lengths available — offering unparalleled versatility for engineers and contractors.
Our expansion eye bolts are designed to support permanent anchoring in solid concrete, brick, and stone. Whether you need compact anchors for sign mounting or robust lifting points for overhead rigging, the wide selection ensures you find the exact fit.
📏 Precision Dimension Chart & Schematic
(Thread Diameter d × Bolt Length L)| Nominal Diameter (d) | Pitch (p) | Inner Ring Dia (a) | Outer Ring Dia (b) | Sleeve Dia (D) | Hole Diameter |
|---|---|---|---|---|---|
| M6 | 1 | 15.39 | 25.31 | 10 | 10 |
| M8 | 1.25 | 19.47 | 31.61 | 12 | 12 |
| M10 | 1.5 | 24.1 | 37.94 | 14 | 14 |
| M12 | 1.75 | 30.06 | 45.55 | 16 | 16 |
| M14 | 2 | 28.2 | 48.87 | 18 | 18 |
| M16 | 2 | 34 | 53.33 | 20 | 20 |
| M18 | 2.5 | 33.69 | 57.27 | 22 | 22 |
| M20 | 2.5 | 40.63 | 62.28 | 25 | 25 |
Schematic drawing: a (inner ring), b (outer ring), d (thread dia), D (sleeve dia), L total length
🏆 Core Product Advantages
🔩 Superior Corrosion Resistance
Constructed entirely from 304 stainless steel, these expansion eye bolts resist rust and corrosion — ideal for outdoor, coastal, and marine environments. Maintain structural integrity even when exposed to moisture, saltwater, or harsh weather.
⛓️ Secure, Pull-Out Resistant Hold
The split expansion sleeve expands evenly, creating an interlocking grip in masonry. Prevents loosening under vibration or repeated load cycles, critical for swing sets or overhead rigging.
⚙️ Versatile Load-Bearing Eye Design
Precision-machined circular eye provides attachment point for ropes, chains, carabiners, and shackles. Allows multi-directional loading, simplifying rigging and lifting setups.
🔧 Easy Installation & Reliable Performance
Requires only a drilled hole and wrench — no specialized tools. Once set, remains permanently anchored with minimal maintenance. Polished surface prevents snags and ensures smooth hardware attachment.
🌍 Common Applications & Problem-Solving
🏞️ Outdoor Recreational Installations
Applications: Swing sets, hammocks, hanging chairs.
Problem Solved: Safe, permanent anchor for high-load equipment. Expansion design prevents pull-out, eliminating hazards from loose anchors.
⚓ Marine & Coastal Rigging
Applications: Boat dock hardware, mooring points, deck attachments.
Problem Solved: Resists rust & saltwater corrosion — prevents failure typical of steel or galvanized anchors.
🏭 Industrial Overhead Rigging
Applications: Overhead lighting, sign mounting, pipe support, industrial lifting.
Problem Solved: Vibration-resistant anchor in concrete ceilings. Eye design simplifies chain/cable connection.
🏗️ Construction & Masonry
Applications: Temporary rigging, scaffolding attachments, maintenance anchors.
Problem Solved: Removable yet secure anchor point without damaging masonry structure. Stainless prevents staining.
📋 Real Customer Case: Bulk Order for Recreational Equipment Manufacturer
🎯 A leading manufacturer of outdoor swing sets and hammocks in eastern China placed a bulk order with DISLAB Precision for 10,000 units of M10x100mm 304 stainless steel expansion eye bolts. The bolts were integrated into residential swing set lines requiring corrosion-resistant anchors with repeated loading.
✅ Our team supplied strict dimensional checks, ensuring consistent expansion sleeve performance. After 12 months of field use, bolts showed no corrosion or loosening even in coastal high-humidity regions. The manufacturer reported zero safety incidents related to anchor failure, leading to a follow-up order for additional sizes to support new hammock product lines.
“Robust quality and reliable performance — DISLAB Precision exceeded our expectations.”
❓ Frequently Asked Questions
At DISLAB Precision, we are your trusted global supplier of industrial parts and accessories. Backed by 300+ qualified facilities, 40+ engineering experts, and strict quality checks. OEM/ODM & custom solutions available.
Direct Contact Channels
- One-stop service: design, customization, production, and global delivery
- OEM/ODM solutions for industrial and export-oriented buyers
