Long 200mm Hex Socket Cap Screws | Grade 12.9 Black Steel | M2-M8 Allen Head Bolts

Engineered for demanding applications, these Lengthened Extra Long 200mm Black Grade 12.9 Steel Allen Bolts deliver exceptional tensile strength and reach. The black oxide finish provides mild corrosi...
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Questions about this product
- What kind of steel are these bolts made of, and do they rust easily?
- These are made from Grade 12.9 alloy steel, which is the highest commercial grade for extreme strength. The black oxide finish offers mild rust protection, but it's best for dry, indoor, or oiled environments.
- Are these 200mm bolts fully threaded, and what are the thread pitches?
- Yes, these extra-long bolts are fully threaded machine screws. The thread pitch varies by size, ranging from 0.7 mm on M4 to 1.25 mm on M8.
- How much strength do these bolts offer for heavy-duty industrial or automotive setups?
- They feature a minimum tensile strength of 1220 MPa and a hardness rating of 39 to 44 HRC. This makes them ideal for high-torque, critical structural loads where standard bolts might shear or bend.
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