Available Sizes & Finishes
18 sizes available
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Applications & Selection Guide
ISO 898-2 class 5 hexagon coupling nuts (rod couplers / extension nuts) to DIN 6334. A long internally threaded hex sleeve — typically about 3d — used to join two threaded rods or a stud to a rod. Metric coarse, listed M5–M20. Pair with class 4.8 rod.
Typical on hangers, bracing, and fabricated studs that must be made longer than a single bar. Both rods should enter far enough for full engagement; a jam nut on each side is common practice. Use class 5 couplers with 4.8 rod — a class 5 coupler on 8.8 rod becomes the weak link. For higher-load hangers use class 8 couplers and 8.8 rod.
Select metric sizes above. Quote with quantity, coating, and destination; matching 4.8 threaded rod and hex nuts can be added to the same cart.
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 5
Manufacturing Standard
DIN 6334
Material Type
Steel
Category
Coupling Nut
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