Product Summary

Longo Full Thread Studs (also known as Threaded Rod Bolts or All-Thread) are high-strength structural fasteners manufactured to DIN 976, ASME B18.31.2, e ASTM A193 standards.

Designed for high-pressure and high-temperature environments, these Longo Full Thread Studs provide continuous threading from end to end, allowing for maximum nut engagement and

adjustable clamping lengths in heavy-duty flange piping, construction, and mechanical assembly.

• ✔ High-Pressure Performance: Optimized for use in pressure vessels, valves, and piping flanges where uniform thread engagement is critical for safety.

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• ✔ Thermal Stability: Specifically engineered using ASTM A193 B7 (Alloy Steel) or B8/B8M (Stainless Steel) to maintain structural integrity in extreme heat or cryogenic conditions.

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• ✔ Customizable Lengths: Easily cut to specific job-site requirements while maintaining full load-bearing capacity along the entire length of the rod.

Product Highlight: Engineered for high-torque applications, Longo full thread studs provide a high-strength, superior alternative to standard bolts in heavy-duty industrial environments.

 

• Continuous Threading – Eliminates the weak point of a bolt head, providing uniform stress distribution across the entire fastener.

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• Chambered Ends – Both ends are precision-chamfered to ensure smooth, easy nut starting and to prevent cross-threading during rapid assembly.

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• Grade-Specific Identification – Each stud can be end-stamped (e.g., "B7") for easy onsite verification of material grade and safety compliance.

Technical Standard: Manufactured to strict international tolerances, ensuring 100% compatibility with standard tapped holes and nuts across all property classes.

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• Standards: DIN 976 (Metric) / ASME B18.31.2 (Inch)

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• High-Strength Specs: ASTM A193 (B7, B8, B8M), ASTM A320 (L7)

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• Metric Size Range: M6 to M100

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• Inch Size Range: 1/4" to 4"

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• Finish: Plain, Zinc Plated, Hot-Dip Galvanized, Xylan/PTFE Coated

Material & Mechanical Properties

• Engineering Note: Structural integrity depends on the correct property class. We offer a full material range to meet your specific tensile strength and ductility requirements.

• Material	Nota	Temperature Range	Aplicativo
  Alloy Steel	ASTM A193 B7	-29°C to 427°C	Oil & Gas / High Pressure
  Alloy Steel	ASTM A320 L7	-101°C to 427°C	Low Temperature / Cryogenic
  Aço inoxidável	ASTM A193 B8 (304)	-196°C to 800°C	Chemical / General Corrosion
  Aço inoxidável	ASTM A193 B8M (316)	-196°C to 800°C	Marine / Highly Corrosive

Dimensions

• Standard Metric & Inch Size Reference

• Metric Size (d)	Pitch (mm)	Inch Size (d)	Threads Per Inch (TPI)
  M12	1.75	1/2"	13 (UNC) / 20 (UNF)
  M16	2.00	5/8"	11 (UNC) / 18 (UNF)
  M20	2.50	3/4"	10 (UNC) / 16 (UNF)
  M24	3.00	7/8"	9 (UNC) / 14 (UNF)
  M30	3.50	1"	8 (UN)

Surface Treatment

• Procurement Guide: Surface finish determines service life. Longze provides specialized coatings to ensure maximum corrosion resistance and aesthetic consistency for any environment.

• Coating	Feature	Salt Spray	Ambiente
  Plain / Oiled	Natural Steel	< 24h	Internal / Submerged in Oil
  HDG	Thick Zinc Layer	500 - 1000h	Outdoor Infrastructure
  PTFE / Xylan	Low Friction	1000h+	Offshore / Chemical / Subsea
  Passivated	Natural SS	1000h+	Food Grade / Marine (Stainless)