Product Summary

Longo Arruelas planas de aço inoxidável (also known as Plain Washers) are high-precision load-distribution components manufactured to ISO 7089, DIN 125, e ASME B18.22.1 standards.

These Longo Arruelas planas de aço inoxidável are essential for protecting the surface of the connected parts and distributing the pressure of the nut or bolt head over a wider area.

Produced from premium SS304 e SS316 grades, they offer exceptional durability and life-long corrosion resistance in the most demanding industrial environments.

• ✔ Surface Protection: Prevents the bolt head or nut from galling or crushing the material surface during high-torque tightening.

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• ✔ Load Distribution: Increases the bearing surface area, effectively reducing the stress on the joint and preventing fasteners from pulling through thin materials.

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• ✔ Superior Corrosion Resistance: SS304 provides excellent resistance for general use, while SS316 (Marine Grade) is optimized for high-chloride and acidic environments.

Product Highlight: Engineered for precision assembly, Longo stainless steel washers provide a smooth, burr-free finish to ensure maximum contact and structural stability in sensitive mechanical joints.

 

• High-Precision Stamping – Manufactured with strict concentricity control to ensure the inner diameter fits perfectly over the bolt shank without excessive play.

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• Deburred Edges – Every batch undergoes a polishing process to remove sharp edges, protecting both the technician and the finished surface of your project.

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• Flatness Stability – Controlled manufacturing prevents cupping or warping, ensuring a uniform 360-degree seal and pressure distribution.

Technical Standard: Manufactured to strict international tolerances, Longo supports a full range of Metric (M1.6 - M100) and Imperial (#0 - 4") sizes, ensuring 100% compatibility across all property classes.

 

• Standards: ISO 7089 / DIN 125 (Metric), ASME B18.22.1 (American)

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• Metric Size Range: M1.6 to M100 (Internal Diameter 1.7mm to 104mm)

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• Inch Size Range: #0 to 4" (Internal Diameter 0.060" to 4.125")

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• Thickness Range: 0.3 mm to 10.0 mm (Standard and Extra Thick options)

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• Material: Stainless Steel A2-70 (SS304) / A4-80 (SS316)

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• Hardness: 140HV / 200HV / 300HV Options

Material & Mechanical Properties

• Engineering Note: Material selection is critical for longevity. We offer specialized stainless alloys to ensure your fasteners match the service life of your equipment.

• Material	Nota	Chemical Feature	Ambiente
  Aço inoxidável	A2 (304)	18% Cr / 8% Ni	General Outdoor / Construction / Food
  Aço inoxidável	A4 (316)	2% - 3% Molybdenum	Marine / Chemical / Coastal Hardware
  Aço inoxidável	316L	Low Carbon	High-Temperature Welding Applications

Dimensions & Global Size Conversion

• Metric to Inch Comparison: Use this integrated conversion table to identify the exact specifications required for your international project. Longze washers are optimized for both DIN and ASME bolt head diameters.

• American Bolt Size	Nearest Metric Bolt (M)	Inner Dia. (mm/inch)	Outer Dia. (mm/inch)	Thickness (mm/inch)
  #10	M5	5.3 mm / 0.208"	10.0 mm / 0.394"	1.0 mm / 0.039"
  1/4"	M6	6.4 mm / 0.252"	12.0 mm / 0.472"	1.6 mm / 0.063"
  5/16"	M8	8.4 mm / 0.331"	16.0 mm / 0.630"	1.6 mm / 0.063"
  3/8"	M10	10.5 mm / 0.413"	20.0 mm / 0.787"	2.0 mm / 0.079"
  1/2"	M12	13.0 mm / 0.512"	24.0 mm / 0.945"	2.5 mm / 0.098"
  5/8"	M16	17.0 mm / 0.669"	30.0 mm / 1.181"	3.0 mm / 0.118"
  3/4"	M20	21.0 mm / 0.827"	37.0 mm / 1.457"	3.0 mm / 0.118"

Surface Treatment

• Procurement Guide: While stainless steel is naturally resistant, Longze provides specialized finishing to enhance aesthetic and chemical performance.

• Finish	Feature	Appearance	Aplicativo
  Plain / Bright	Polished Shine	Bright Silver	Furniture / Visible Hardware
  Passivated	Chemical Cleaned	Clean Matte	Medical / Food Processing
  Electro-Polished	Ultra-Smooth	Mirror Finish	High-End Marine / Yachting