Expansion Bolts Manufacturer
MT.BOLTS manufactures expansion bolts, which are mechanical anchors designed to fasten objects to concrete, brick, or masonry. These bolts expand upon installation, creating a secure hold within the base material. They are widely used in structural, mechanical, and construction applications where post-installed anchoring is required. MT.BOLTS offers expansion bolts in a range of types, sizes, and materials to ensure reliable performance in static and dynamic load conditions.
- System of Measurement:
Metric (M6–M24) | Imperial (1/4″ to 1″) - Length Range:
40 mm to 300 mm | 1.5″ to 12″ - Thread Pitch:
Metric (Coarse) | UNC - Thread Type:
Partial thread (on bolt shank) - Head/Embedded End Types:
Hex Head, Flat Head, Round Head , Countersunk Head (for flush installation) - Finish Options:
Plain, zinc-plated, hot-dip galvanized, black oxide, passivated, or custom coatings - Standards:
- DIN 529 – Expansion foundation bolts
- BS 8539 – Construction fixings in concrete
- ETAG 001 – European guideline for metal anchors in concrete
- ASTM F3125 / F1554 – Structural anchoring systems
- Custom / OEM Standards – For specialized installations
Expansion Bolts Material Types
MT.BOLTS supplies carbon steel, stainless steel, duplex steel, and nickel-based alloy Expansion Bolts , meeting the demanding requirements of chemical, marine, and high-temperature environments, compliant with various international standards.
| Material Category | Common Grades/Models | Description |
| Carbon Steel | ASTM A307, A325, A490 | High strength and cost-effective, suitable for general structures; requires anti-corrosion coating. |
| Stainless Steel | 304 (A2), 316 (A4), 321, 410 | Excellent corrosion resistance; widely used in food, chemical, and construction industries |
| Duplex Stainless Steel | UNS S31803/S32205 (F51), UNS S32750 (F53) | High strength with superior chloride corrosion resistance; used in seawater, petrochemical, and paper industries |
| Monel Alloys | Monel 400, Monel K500 | Excellent seawater corrosion resistance and mechanical strength; used in marine engineering and pump systems |
| Hastelloy Alloys | Hastelloy C276, C22, B2, X | Excellent resistance to strong acids and oxidizing media; widely used in chemical equipment and flue gas desulfurization |
| Inconel Alloys | Inconel 600, 625, 718 | Resistant to high temperature, pressure, and corrosion; used in heat exchangers, aerospace, and nuclear industries |
| Incoloy Alloys | Incoloy 800, 825, 925 | Ideal for high-temperature acidic environments; widely used in petroleum refining and heat treating systems |
| Nickel Alloys | Nickel 200, 201 | Pure or high-nickel alloys with excellent conductivity and alkali resistance; used in electronics and chemical applications |
Expansion Bolts System of Measurement
- Metric Sizes: M6 to M64
- Imperial Sizes: 1/4″ to 2.5″
- Length Range:
- Metric: 100 mm to 1500 mm
- Imperial: 4″ to 60″
- Thread Pitch: Metric (Coarse/Fine) | UNC/UNF
- Thread Type: Partial thread (typically only on exposed end)
Expansion Bolts Common Standards
- ASTM F1554 (Grades 36, 55, 105) – Construction-grade anchor bolts
- ASTM A307 / A325 / A449 – General-purpose steel anchor bolts
- DIN 529 – Foundation bolts with hooks or bends
- ISO 898-1 – Mechanical properties of fasteners
- BS 7419 / BS 8530 – UK standards for anchor bolts
- Custom / OEM Standards – Project-specific specifications
Expansion Bolts Surface Finishes
- Zinc-plated – Corrosion resistance in indoor environments
- Hot-dip galvanized – Excellent protection in outdoor/marine use
- Black oxide – Mild corrosion resistance, often for aesthetic or indoor use
- Passivated – Used on stainless steel bolts to improve corrosion resistance
- Custom Coatings (e.g., PTFE) – Non-stick, chemical-resistant for harsh environments
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Benefits and Limitations of Expansion Bolts
Advantages
- Strong and secure anchoring in concrete, brick, and masonry
- Easy post-installation without needing cast-in inserts
- Widely available in multiple head types and materials
- Suitable for dynamic and static load applications
- Provides immediate load-bearing capability
Disadvantages
- Not suitable for soft or hollow base materials
- Requires precise drilling and hole-cleaning
- Over-tightening can cause base material cracking
- Permanent anchoring—removal can damage the surface
- Performance may reduce in seismic or vibratory conditions
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Expansion Bolts Applications
- Construction and structural anchoring
- Mounting heavy equipment or base plates
- Fixing guard rails, support brackets, and scaffolding
- Electrical and HVAC installations
- Shelving, storage systems, and facade cladding
FAQ About Expansion Bolts
Commonly made from carbon steel, stainless steel (304/316), or alloy steel with anti-corrosion coatings.
Generally no—removal often damages the anchor or hole integrity.
Wedge anchors expand using a cone-shaped wedge; sleeve anchors use an expansion sleeve—each suits different materials and loads.
Only if specifically rated for overhead or tensile loads; otherwise, use ceiling-specific anchors.
Use stainless steel or hot-dip galvanized types for corrosion resistance in such conditions.
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