Steel All-Metal Lock Nut, Class 8
ISO 898-2 class 8 all-metal prevailing-torque lock nuts to DIN 980 / ISO 7042. Deformed-thread metal locking — no nylon, so heat and paint-oven service are possible. Listed M6–M20.
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Available Sizes & Finishes
8 sizes available
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Applications & Selection Guide
ISO 898-2 class 8 all-metal prevailing-torque lock nuts to DIN 980 / ISO 7042. The locking feature is a deformed or slotted metal crown — no polymer insert — so the nut remains a one-piece steel component. Metric coarse, listed M6–M20. Pair with class 8.8 bolts.
Use where nylon would fail: elevated temperature, paint ovens, solvents, or specifications that forbid non-metallic inserts. All-metal lock nuts are the usual choice on engines, exhaust-adjacent brackets, and plant that sees heat cycling. They can be reused more times than a Nyloc, but prevailing torque still declines — follow the joint specification. Not a substitute for a pretensioned HV set.
Add sizes and quantities to the quote cart with coating and destination. Matching 8.8 bolts and washers can be included.
Technical guides
Bolt grades and sizes: 8.8, 10.9, 12.9, A2 and A4, and metric hex bolt dimensions
What the property classes 4.8, 8.8, 10.9 and 12.9 and stainless A2-70 and A4-70 mean, minimum strength and tensile loads, metric thread pitch and hex head sizes, DIN 933 vs DIN 931, and which nut goes with which bolt.
Read the guide →Nut and washer types compared: hex, lock, flange, castle, coupling, cap and HV nuts, flat, spring and structural washers, with their standards
How hex, thin, nylon-insert and all-metal lock, flange, castle, coupling, cap, wing and HV nuts differ, which nut class goes with which bolt, and when to use DIN 125, DIN 127, DIN 7989 and DIN 6916 washers.
Read the guide →Product Information
Material Grade
ISO 898-2 class 8
Manufacturing Standard
DIN 980 / ISO 7042
Material Type
Steel
Category
All-Metal Lock Nut
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