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Dome Bolts
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Dome Bolts

Last Updated: July 25, 2026

Starting From 48Rs/Pcs

A dome bolt, commonly referred to as a dome head bolt, mushroom head bolt, or carriage bolt, is a specialized structural fastener featuring a smooth, rounded dome-shaped head atop an externally threaded shank. It works by inserting into a clearance hole, often incorporating a square neck or ribbed shoulder under the dome that grips into the base material or mating slot to prevent the bolt from spinning as the nut is tightened. The smooth, snag-free outer dome profile provides an aesthetically clean surface, tamper resistance, and safety against physical snags, making dome bolts essential for public infrastructure, transport equipment, structural timber, and heavy machinery housings.

Technical Specifications of Dome Bolts In India

Size / Diameter Range M4 to M48 (Metric) / 1/4" to 2" (Imperial standard)
Length Range 15 mm to 600 mm
Specification (All sizes available)
Head & Neck Style Variations Dome Head with Square Neck (Carriage Bolt), Mushroom Head, Dome Head Socket Screw, Ribbed Neck Dome Bolt, Flat Dome Bolt
Material Grades Carbon Steel: IS 2062, Grade 4.6, 5.6, 8.8, ASTM A307
High-Strength Alloy Steel Class 10.9, 12.9, ASTM A193 B7/B7M
Stainless Steel AISI 304 (A2-70/80), AISI 316 (A4-70/80), 316L, 321, 347, Duplex 2205
High Nickel Alloy Monel 400/K500, Inconel 600/625/718, Incoloy 800/825, Hastelloy C22/C276
Specification (All Grades available)
Standards & Specifications DIN 603, ISO 8677, ASME/ANSI B18.5, BS 4933
Surface Finish Plain Black / Oiled, Hot-Dip Galvanized (HDG), Electro-Zinc Plated, Yellow Zinc Passivated, Bright Passivated (SS), PTFE Coated
Origin Indian / Imported

Sourcing Terms & Timeline

Payment Terms

Letter of Credit / Bank Transfer / Advance

Delivery Package

Mill Test Certificate (MTC) + Inspection Reports

Standard Delivery

2-5 Working Days in Maharashtra region

Custom Cuts Support

Custom length cutting & shearing facilities available

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Benefits and Application of Dome BoltS

Benefits

  • Snag-Free and Safety-Centric Profile: The rounded, low-profile dome head eliminates sharp corners and protruding edges, preventing accidental injury or clothing snags in high-traffic installations.

  • Anti-Rotation Under-Head Locking: Integrated square neck or knurled shoulder locks securely into the mating surface, enabling single-person installation using a wrench on the nut side only.

  • Tamper-Resistant Exterior: Absence of a drive socket or wrenching flats on the smooth dome surface deters unauthorized removal or vandalism from the exposed head side.

    Applications

    Dome bolts are extensively specified across industrial manufacturing, transport networks, and civil infrastructure where safety, aesthetics, and tamper resistance are vital. In highway guardrail installations and bridge safety barriers, hot-dip galvanized carbon steel dome bolts secure corrugated beam rails, providing a smooth exterior surface that prevents vehicular snagging during impacts. Rail coach manufacturing and automotive bodybuilders utilize stainless steel (304/316) dome head bolts to fasten interior paneling, seating frames, and wooden flooring where protruding bolt heads pose a trip or cut hazard to passengers. Industrial machinery builders and conveyor system manufacturers employ alloy steel dome bolts to secure protective guards, hopper liners, and enclosure panels exposed to heavy vibration. Additionally, marine infrastructure projects and coastal boardwalk developments rely on corrosion-resistant Duplex and Stainless Steel dome bolts to anchor timber and composite decking assemblies, ensuring long-term structural clamping against saltwater wash and atmospheric weathering.

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Procurement Network

Supplying to top industrial contractors

VIVEK INDUSTRIES APEX INFRASTRUCTURE MUMBAI METRO METALLICS GODREJ METALS TATA INFRA
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Ultrasonic Testing Reports

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Hot Dip Galvanizing

Premium corrosion protective zinc coating applied to structural steels.

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Logistics & Site Unloading

Flat-bed truck logistics matching tight construction schedules in Mumbai.

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