Neelkamal Alloys LLP is a globally recognized manufacturer, stockist, and exporter of high-integrity stud bolts, double-ended studs, and continuously threaded rods. Produced in accordance with international standard dimensions such as ASME B18.31.2, ASME B16.5, DIN 975, and DIN 976, our stud bolts are engineered for heavy-duty pressure piping, valve connections, and elevated-temperature joint assemblies.
Operating from our modern manufacturing facilities in Mumbai, India, we process alloy steel, high-tensile stainless steel, duplex steel, Inconel, Hastelloy, Monel, and Titanium raw materials. Each batch undergoes rigorous testing to guarantee full dimensional precision, thread compliance, and mechanical reliability across petroleum, gas processing, power generation, and offshore installations in over 105 countries.
Our machining lines produce standardized and drawing-based studs tailored to exact mechanical specifications and flange arrangements.
Continuous thread studs designed for flange bolted joints under ASME B16.5 and B16.47 specifications. Ideal for pressure vessel, refinery, and pipeline service.
Features a short thread on one end designed to be screwed into a tapped hole, with a longer body thread on the opposite side for nut engagement.
Designed with equal length threads on both ends separated by an unthreaded central shank, ideal for structural alignment and clamping assemblies.
Technical reference guide comparing high-temperature, low-temperature, and corrosion-resistant stud bolting materials.
| Material Category | ASTM Material Specifications | Matching Heavy Hex Nuts | Typical Operating Applications |
|---|---|---|---|
| High-Tensile Alloy Steel | ASTM A193 Grade B7 / B7M, ASTM A193 Grade B16 | ASTM A194 Grade 2H / 2HM | High-temperature boilers, pressure vessels, refinery piping. |
| Low-Temperature Steel | ASTM A320 Grade L7 / L7M, ASTM A320 Grade L43 | ASTM A194 Grade 7 / 7M | Cryogenic service, arctic oilfield pipelines, LNG terminals. |
| Austenitic Stainless Steel | ASTM A193 B8 (SS 304), B8M (SS 316), B8T (SS 321), Class 1 & 2 | ASTM A194 Grade 8, Grade 8M, Grade 8T | Chemical processing plants, marine installations, food duty. |
| Duplex & Super Duplex | UNS S31803 / S32205 (2205), UNS S32750 (2507), UNS S32760 | Matching Duplex & Super Duplex Heavy Nuts | Desalination plants, offshore platforms, high chloride fluids. |
| Nickel & High Alloys | Inconel 625 / 718, Hastelloy C276, Monel 400, Alloy 20 | Matching High-Alloy Machined Nuts | Aggressive acids, sour gas (H2S), extreme thermal exposure. |
| Titanium Alloys | ASTM B348 Grade 2, Grade 5 (Ti-6Al-4V) | ASTM F467 / F468 Titanium Nuts | Aerospace structures, seawater immersion, weight-critical systems. |
Every raw heat is verified using X-ray Spectrometry (PMI) to ensure chemical composition matches mill test reports.
Tensile, yield strength, elongation, and Charpy V-notch impact testing for low-temperature compliance.
Class 2A/3A go/no-go ring gauges ensure smooth nut engagement and accurate thread pitch control.
Options for Fluoropolymer PTFE (Xylan 1424), Hot-Dip Galvanizing, Cadmium, and Zinc-Nickel Plating.
Answers to crucial technical and logistics inquiries for international EPC procurement teams and stockists.
We manufacture stud bolts strictly adhering to ASTM A193 (B7, B7M, B8, B8M, B8T, B16), ASTM A320 (L7, L7M, L43), Duplex 2205, Super Duplex 2507, Inconel 625/718, and Titanium, with dimensions per ASME B18.31.2, ASME B16.5, and DIN 975/976.
Yes, all orders are shipped with complete EN 10204 3.1 Mill Test Certificates detailing chemical composition, mechanical properties, heat treatment, and non-destructive testing results.
We offer surface treatments including Fluoropolymer PTFE Coating (Xylan), Hot-Dip Galvanizing (HDG), Electro-Zinc Plating, Cadmium Plating, and Phosphate Coatings for extreme chemical and marine exposure.
Standard sizes in ASTM A193 B7 and B8M are available from stock for immediate dispatch. Custom alloy, non-standard threading, or drawing-based orders typically take 10 to 20 days.
Get in touch with our fast-response engineering sales team for immediate stock availability, custom manufacturing capabilities, and competitive export pricing.
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