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The Lyn-Tron Metric Round Thumb Nut is precision-engineered in the USA to deliver reliable hand-tightening for a variety of applications. Designed with a knurled, easy-grip surface, this nut allows for tool-free installation and removal, making it ideal for equipment panels, enclosures, and assemblies requiring frequent access or adjustment.

Manufactured under the trusted Lyn-Tron brand, this thumb nut features high-quality materials and tight tolerances to ensure strength, durability, and a clean fit on metric-threaded components. Whether used in electronics, industrial machinery, or prototyping, it provides a dependable fastening solution with a professional finish.

As part of OneMonroe’s extensive line of fasteners and precision hardware, the Lyn-Tron Metric Round Thumb Nut reflects our commitment to American-made quality and engineering excellence.

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Material

Head Diameter

Washer Dia

Female Thread

Item #

Material

OD

Head Diameter

Washer Dia

Female Thread

N/A Brass N/A 6 mm N/A 6 mm N/A 5 mm N/A M2.5x0.45
N/A Brass N/A 8 mm N/A 8 mm N/A 6 mm N/A M3X0.5
N/A Brass N/A 10 mm N/A 10 mm N/A 9 mm N/A M3.5x0.6
N/A Brass N/A 10 mm N/A 10 mm N/A 9 mm N/A M4X0.7
N/A Brass N/A 13 mm N/A 13 mm N/A 11 mm N/A M5X0.8
N/A Brass N/A 13 mm N/A 13 mm N/A 12 mm N/A M6X1
N/A Brass N/A 19 mm N/A 19 mm N/A 16 mm N/A M8X1.25
N/A Stainless Steel N/A 6 mm N/A 6 mm N/A 5 mm N/A M2.5x0.45
N/A Stainless Steel N/A 8 mm N/A 8 mm N/A 6 mm N/A M3X0.5
N/A Stainless Steel N/A 10 mm N/A 10 mm N/A 9 mm N/A M3.5x0.6
N/A Stainless Steel N/A 10 mm N/A 10 mm N/A 9 mm N/A M4X0.7
N/A Stainless Steel N/A 13 mm N/A 13 mm N/A 11 mm N/A M5X0.8
N/A Stainless Steel N/A 13 mm N/A 13 mm N/A 12 mm N/A M6X1
N/A Stainless Steel N/A 19 mm N/A 19 mm N/A 16 mm N/A M8X1.25
N/A Steel N/A 6 mm N/A 6 mm N/A 5 mm N/A M2.5x0.45
N/A Steel N/A 8 mm N/A 8 mm N/A 6 mm N/A M3X0.5
N/A Steel N/A 10 mm N/A 10 mm N/A 9 mm N/A M3.5x0.6
N/A Steel N/A 10 mm N/A 10 mm N/A 9 mm N/A M4X0.7
N/A Steel N/A 13 mm N/A 13 mm N/A 11 mm N/A M5X0.8
N/A Steel N/A 13 mm N/A 13 mm N/A 12 mm N/A M6X1
N/A Steel N/A 19 mm N/A 19 mm N/A 16 mm N/A M8X1.25
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