UNI 5731 – Mushroom Head Square Neck Bolts

(DIN 603 | ISO 8677 | CSN 021319 | PN 82406 Equivalent)

Leading Manufacturer, Exporter & Supplier – Dipti Metal Industries

Founded in 2009 by Kumpsingh Rajput, Dipti Metal Industries is a trusted UNI 5731 manufacturer, UNI 5731 exporter, UNI 5731 supplier, UNI 5731 stockist, UNI 5731 dealer, UNI 5731 distributor, and UNI 5731 wholesaler of UNI 5731 Mushroom Head Square Neck Bolts in India, exporting to over 40 countries worldwide. Our products are engineered to meet UNI 5731 specifications and equivalent international standards DIN 603, ISO 8677, CSN 021319, and PN 82406.

Mushroom Head Square Neck Bolts are widely used in applications where a smooth, domed head is required for safety and appearance, while the square neck ensures a secure anti-rotation grip during installation.

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Product Specifications

• Standard: UNI 5731

• Equivalent Standards: DIN 603, ISO 8677, CSN 021319, PN 82406

• Thread Type: Metric Coarse (ISO Metric)

• Head Type: Mushroom / Dome Head

• Neck: Square Neck for anti-rotation grip

• Size Range: M5 to M24 (lengths 20 mm to 300 mm)

• Thread Length: Full thread or partial thread as per requirement

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Available Material Grades

Carbon Steel

• Grades: 4.6, 5.6, 6.8, 8.8, 10.9, 12.9

• Surface Coatings: Zinc Plated, Hot Dip Galvanized (HDG), Black Oxide, Geomet, Dacromet

Stainless Steel

• Grades: A2-50, A2-70, A4-70, A4-80 (SS 304, SS 316, SS 316L)

• Finish: Self-Coloured, Passivated, Polished

Alloy Steel

• High tensile alloy grades with heat treatment

• Coatings: Phosphate, Zinc-Nickel, PTFE

Brass & Copper Alloys

• Grades: CZ121, CW614N, Naval Brass, Silicon Bronze

Special Alloys (on request)

• Duplex 2205, Super Duplex 2507

• Monel 400, Monel K500

• Inconel 600, Inconel 625, Inconel 718

• Hastelloy C22, Hastelloy C276

• Titanium Grade 2, Titanium Grade 5

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Applications

• Railway track assembly

• Timber construction and carpentry

• Structural steel fabrication

• Agricultural machinery manufacturing

• Playground and park equipment installation

• Marine and dock hardware

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Manufacturing & Quality Assurance

All bolts are produced using cold or hot forging, precision machining, and strict dimensional inspection. Each product meets international standards and is supplied with full certification.

Quality Tests Conducted:

• Dimensional verification

• Mechanical strength testing

• Coating thickness measurement

• Corrosion resistance (salt spray) testing

• Positive Material Identification (PMI)

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Export & Packing Details

• Packing: Bulk in gunny bags, small boxes in cartons, or wooden pallets/crates

• Marking: Grade, size, standard, and batch number

• Ports of Dispatch: Major Indian seaports and airports

• Shipping Terms: EXW, FOB, CFR, CIF, DDP

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Worldwide Supply Network

We export UNI 5731 Mushroom Head Square Neck Bolts to markets in North America, South America, Europe, Middle East, Africa, and Asia-Pacific, serving industries such as construction, railways, marine, and heavy machinery.

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Why Choose Dipti Metal Industries?

• 15+ years of industry experience

• Wide selection of material grades and finishes

• Compliance with global standards

• Competitive pricing and timely delivery

• Large stock availability for urgent shipments