Leading Industrial Screw Manufacturer & Supplier in India
Neelkamal Alloys LLP is a premier manufacturer, stockist, and global exporter of high-precision industrial screws engineered for severe mechanical, structural, and chemical process applications. Operating from Mumbai, India, our state-of-the-art production facility produces screws designed to meet the rigorous standards demanded by EPC contractors, plant owners, and original equipment manufacturers (OEMs) across 105+ countries.
Our comprehensive product inventory includes socket head cap screws, hex head machine screws, set screws, pan head screws, countersunk flat screws, and custom drawing-based special fasteners. Manufactured from high-tensile and corrosion-resistant alloys, our screws maintain structural integrity under high pressure, mechanical fatigue, and thermal stress.
Material Engineering & International Standards Compliance
To withstand diverse service environments—ranging from subsea chloride exposure to high-temperature refining process streams—we manufacture screws in an extensive range of material grades:
- Stainless Steel: AISI 304, 304L, 316, 316L, 310S, 321, 347 (ASTM A193 B8 / B8M, ASTM F593)
- Duplex & Super Duplex Steel: UNS S31803 / S32205 (2205), UNS S32750 (2507), UNS S32760 (F55)
- Nickel Alloys & Inconel: Inconel 600, 625, 718; Incoloy 800/825; Monel 400, K500; Hastelloy C276, C22
- Titanium Alloys: Titanium Grade 2 (UNS R50400), Titanium Grade 5 (Ti-6Al-4V / UNS R56400)
- Exotic Alloys: Alloy 20 (UNS N08020), SMO 254 (UNS S31254), Copper-Nickel Alloys
All screw threads are manufactured via precision thread rolling or CNC cutting to achieve ASME B1.1 (UNF/UNC Class 2A/3A) and ASME B1.13M (Metric 6h/6g) thread tolerance classes. Dimensions strictly conform to ASTM, ASME B18.3, ASME B18.6.3, DIN (DIN 912, DIN 933, DIN 7991), ISO 4762, and BS standards.
Industrial Screw Product Categories
Technical Specifications & Size Range
Our manufacturing parameters accommodate both standard metric/imperial sizes and custom OEM engineering requirements:
| Specification Parameter | Manufacturing Range & Standards |
|---|---|
| Diameter Sizes | Imperial: 3/8" to 8" | Metric: M3 to M100 |
| Length Range | 3 mm to 500 mm (Custom lengths available on request) |
| Thread Configurations | UNC, UNF, Metric Coarse, Metric Fine, BSW, BSF |
| Standard Conformity | DIN 84, DIN 912, DIN 916, DIN 931, DIN 933, DIN 965, ASME B18.2.1, ASME B18.3, ASME B18.6.3, ISO 4762 |
| Head Drive Options | Socket Hex, Slotted, Phillips, Torx (Six-Lobe), Combination Drives |
| Surface Coatings & Finishes | PTFE Coating, Xylan Coating, Zinc Plating, Hot-Dip Galvanizing (HDG), Black Oxide, Passivated, Cadmium Plating |
| Quality Certification | EN 10204 3.1 Mill Test Certificate, PMI Reports, PED 97/23/EC, Merkblatt AD 2000 W2 |
Strict Quality Assurance & Export Verification
To guarantee zero-defect delivery for critical projects, every production batch undergoes mandatory inspection at our in-house metallurgical testing laboratory. Quality assurance protocols include:
- Material Identification: Positive Material Identification (PMI) via XRF analyzer to verify alloy composition.
- Mechanical Testing: Tensile strength, yield strength, elongation, and hardness testing (Rockwell / Brinell).
- Dimensional Precision: Thread pitch micrometer verification, Go / No-Go ring gauge calibration, and optical profile inspection.
- Third-Party Inspection: Independent inspection welcome via Bureau Veritas, TUV, DNV, SGS, or Lloyd's Register.
Key Application Sectors
Screws manufactured by Neelkamal Alloys LLP are deployed in high-spec engineering sectors where joint reliability is paramount:
- Oil & Gas Process Systems: Subsea valves, offshore platforms, wellheads, and refinery pipelines.
- Chemical & Petrochemical Plants: Acid heat exchangers, pressure vessels, reactors, and storage tanks.
- Marine & Desalination Facilities: Seawater pumps, reverse osmosis units, and naval architecture.
- Heavy Machinery & Aerospace: Turbine assemblies, defense hardware, compressors, and high-vibration equipment.