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Product Name
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Metal Insert Hexagon Lock Nut Hex Self Locking Locknut DIN980 GB6184
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Finish
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ZINC PLATED, galvanized, Nickel Plated, Polished
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Measurement system
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Metric
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Application
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Heavy Industry, General Industry, Automotive Industry
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Place of Origin
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China
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Brand Name
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Angooter
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Model Number
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M3 M4 M5 M6 M8 M10 M12
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Material
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Stainless steel , carbon steel
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Certificate
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ISO, ROHS
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Grade
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A2-70 ; A4-80
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Delivery time
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small order normally in 3~5 working days
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Regarding price
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pls contact sales to confirm the exactly specific price and freight
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The fundamental positioning of the full-metal lock nut GB6184 lies in its "all-metal material + mechanical anti-loosening" design. Its standards and structural features determine its differentiated advantages:
GB6184 explicitly stipulates that the nut material must be all-metal, such as carbon steel (e.g., Grade 8, Grade 10 high-strength steel) and stainless steel (e.g., 304, 316), prohibiting the use of non-metallic components like nylon or rubber. The anti-loosening structure must be achieved through metal plastic deformation, with common forms including:
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收口型 (Shrinkage Type): One end of the nut is radially contracted, making the thread hole diameter slightly smaller than the bolt outer diameter to form an interference fit during assembly;
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壓點型 (Indentation Type): Convex points are pressed on the inner thread surface of the nut, creating interference anti-loosening when engaged with the bolt threads;
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切槽型 (Grooved Type): Axial grooves are cut into the inner thread of the nut, and metal deformation at the grooves forms anti-loosening resistance during assembly.
The absence of non-metallic components means it avoids the risk of non-metallic aging and failure at high temperatures (e.g., nylon inserts tend to soften at temperatures above 120℃) and prevents non-metallic damage from chemical corrosion (e.g., nylon degrades easily in strong acid environments). It also features stronger structural integrity and can withstand greater impact loads.
Compared with the nylon-insert lock nut GB889.1 (which uses a nylon ring embedded in the nut’s inner thread for anti-loosening via friction between nylon and the bolt), the structural differences of the full-metal lock nut GB6184 directly lead to variations in temperature resistance and service life: the maximum temperature resistance of the former is usually no more than 120℃, while the latter can withstand temperatures above 300℃ for carbon steel versions and up to 400℃ for stainless steel versions, making it suitable for high-temperature working conditions (e.g., engine compartments, boiler equipment).
The full-metal lock nut GB6184 adopts "mechanical interference anti-loosening," forming permanent or semi-permanent engagement with bolt threads through metal structural deformation. Its anti-loosening effect is not affected by vibration frequency or temperature changes. Experimental data shows that in high-frequency vibration scenarios (vibration frequency: 500-2000Hz), after 100,000 vibration cycles, the preload attenuation rate of the full-metal lock nut GB6184 is only 5%-8%; in contrast, the nylon-insert lock nut has a preload attenuation rate of up to 20%-30% due to nylon elastic attenuation, posing a high risk of loosening.
However, it should be noted that the anti-loosening effect of the full-metal lock nut GB6184 relies on "one-time assembly": after disassembly, the metal deformation of shrinkage-type or indentation-type structures cannot be fully restored, leading to a significant decline in anti-loosening effect during secondary assembly (preload attenuation rate rises to 15%-20%); whereas the nylon-insert lock nut can be disassembled and reassembled multiple times as long as the nylon ring remains undamaged, with minimal attenuation in anti-loosening effect (preload attenuation rate of approximately 8%-10% during secondary assembly).
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Temperature Resistance: As mentioned earlier, the temperature resistance of the full-metal lock nut GB6184 is far superior to that of nylon-insert types. In scenarios such as automobile engine block connections (operating temperature: 150-250℃) and industrial boiler pipeline fixation (temperature: 200-350℃), full-metal nuts can operate stably for a long time; in contrast, nylon-insert nuts tend to have softened nylon rings that lose elasticity when temperatures exceed 120℃, resulting in anti-loosening failure and requiring frequent replacement.
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Corrosion Adaptability: The stainless steel versions (e.g., 304, 316) of the full-metal lock nut GB6184 have corrosion resistance comparable to that of nylon-insert nuts. However, in highly corrosive environments (e.g., offshore platforms, chemical workshops), the all-metal structure eliminates the risk of "electrochemical corrosion caused by contact between non-metals and metals" (when nylon inserts contact carbon steel nuts, potential differences easily trigger carbon steel rusting). Compared with Spiralock thread lock nuts (which achieve anti-loosening through a special thread profile and are also all-metal), GB6184 has the advantage of a simpler structure and lower processing costs; Spiralock nuts, due to their complex thread profiles and high precision requirements, typically cost 1.5-2 times more than GB6184 nuts.
The strength grades of GB6184 full-metal lock nuts are consistent with those of ordinary hexagon nuts, including Grade 8, Grade 10, Grade 12, etc. Among them, Grade 10 full-metal lock nuts have a tensile strength of up to 1040MPa and a yield strength of ≥940MPa, making them compatible with Grade 10.9 high-strength bolts. They are used in high-load scenarios such as heavy machinery and wind power equipment (e.g., wind turbine tower connections, with loads reaching 50-100kN).
Compared with the combination of elastic washers and ordinary nuts (e.g., GB93 spring washers + GB6170 nuts), the full-metal lock nut GB6184 distributes loads more evenly: spring washers are prone to permanent deformation under long-term loads, leading to preload reduction, while full-metal lock nuts maintain stable load retention through mechanical interference anti-loosening. Under the same load, their service life is 2-3 times that of spring washer combinations.
