Lag Bolts Manufacturer
MT.BOLTS manufactures Lag Bolts, which are heavy-duty fasteners designed for anchoring wood to wood or wood to other materials such as masonry. These bolts feature a hex head and a sharp, coarse-threaded shank that allows them to be driven directly into wood without the need for a nut. Lag bolts provide strong holding power in structural framing, heavy timber connections, construction, and utility installations. MT.BOLTS offers lag bolts in a variety of styles, sizes, materials, and finishes to meet demanding engineering and structural needs.
- System of Measurement:
Metric (M6–M24) | Imperial (1/4″ to 1″) - Length Range:
25 mm to 400 mm | 1″ to 16″ - Thread Pitch:
Metric (Coarse) | UNC - Thread Type:
Full thread or partial thread (depending on size and application) - Head Types:
Hex Head (standard), Square Head (optional) - Point Types:
Gimlet Point (tapered), Cone Point (custom) - Finish Options:
Plain, zinc-plated, hot-dip galvanized, black oxide, passivated, or custom coatings - Standards:
ASTM A307 – Carbon Steel Bolts and Studs
DIN 571 – Hex Head Lag Screws
ISO 4017 / ISO 4042 – For coating and thread specifications
Custom / OEM project specifications available
Lag Bolts Material Types
MT.BOLTS supplies carbon steel, stainless steel, duplex steel, and nickel-based alloy Lag 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 |
Lag Bolts System of Measurement
Lag bolts are available in both Metric and Imperial measurement systems:
- Metric Sizes: M6 to M24
- Imperial Sizes: 1/4″ to 1″ diameter
- Length Range:
- Metric: 25 mm to 400 mm
- Imperial: 1″ to 16″
- Thread Type: Coarse thread (wood thread), typically full-thread or partial-thread depending on application
- Drive Type: External hex head (driven using a wrench or socket)
Lag Bolts Common Standards
Lag bolts are manufactured in accordance with the following common standards:
- ASTM A307 – Standard for low-carbon steel bolts including lag screws
- DIN 571 – German standard for hex head lag screws
- ISO 4017 / ISO 4042 – Standards for hex bolts and surface finishes
- ASME B18.2.1 – Dimensional standards for hex bolts and screws
- Custom / OEM specifications – Available for specific industrial or construction requirements
Lag 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 Lag Bolts
Advantages
- Strong holding power in wood without requiring a nut
- Ideal for heavy timber construction and structural framing
- Easy to install using standard tools
- Versatile for wood-to-wood and wood-to-masonry connections
- Available in corrosion-resistant coatings for outdoor use
Disadvantages
- Not suitable for high-tension or critical load-bearing steel structures
- Can cause wood splitting if not pre-drilled or used improperly
- Removal and reuse may degrade holding power
- Installation into masonry typically requires a shield or anchor plug
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Lag Bolts Applications
Lag bolts are widely used in:
- Heavy timber construction
- Wood-to-wood and wood-to-concrete anchoring (with expansion anchors)
- Deck building and wood framing
- Utility poles and electrical mounting hardware
- Machinery and equipment mounting to wood bases
- Fencing and outdoor structures
FAQ About Lag Bolts
Yes, a pilot hole is generally recommended to prevent wood splitting and to ease installation.
Yes, but typically with a lag shield or masonry anchor to ensure secure holding.
They can be reused, but threads may strip or holding power may reduce, especially in wood.
A wrench or socket driver is commonly used for installation.
Common finishes include plain steel, zinc plating, hot-dip galvanizing, and black oxide for corrosion resistance.
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