Available Sizes & Finishes
18 sizes available
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Applications & Selection Guide
ISO 898-2 property class 8 hexagon coupling (extension) nuts to DIN 6334. A long internally threaded hex sleeve — typically about 3d — joining two lengths of class 8.8 threaded rod or stud. Metric coarse, listed M5–M20. Keep coupler, rod, and nuts in the same property class.
Specify on machinery anchoring, pipe supports, and long fabricated studs in 8.8. Keep coupler, rod, and nuts in the same property class. Coupling nuts do not replace a properly designed turnbuckle where adjustment and inspection are required.
Request a quote with sizes, quantities, finish, and delivery country. Matching 8.8 rod and class 8 nuts 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 →Threaded rod sizes and weights: DIN 975 / DIN 976-1 metric rod from M4 to M64
Thread pitch, stress area and weight per metre of metric threaded rod from M4 to M64 in carbon steel class 4.8 and 8.8 and in A2 and A4 stainless steel.
Read the guide →Product Information
Material Grade
ISO 898-2 class 8
Manufacturing Standard
DIN 6334
Material Type
Steel
Category
Coupling Nut
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