Complete range of industrial fasteners — hex bolts, socket head screws, threaded rods, anchors, washers, and specialty hardware in Grade 8.8 / 10.9 / 12.9 and stainless A2-70 / A4-80. DIN, ISO, ANSI, and JIS standards for heavy equipment, structural, and automotive assemblies.
Industrial fasteners — screws, nuts, washers, studs, anchors, and rivets — are the load-bearing components that hold machinery, structures, and vehicles together. Often called the "rice of industry," they determine the safety, service life, and reliability of every assembly. This guide covers fastener types, ISO/SAE/ASTM strength grades, materials, coatings, and application selection to help you specify the right fastener for any high-load program.
An industrial fastener is a standardized mechanical component used to join two or more parts through a removable threaded or permanent non-threaded connection. Unlike welding or adhesives, fasteners allow the joint to be disassembled for service, repair, or replacement — critical for heavy equipment, automotive, and structural applications. The four key engineering properties of any fastener are tensile strength, yield strength, corrosion resistance, and fatigue life, determined by material, heat treatment, and thread-rolling process.
Dafluid supplies the full industrial fastener portfolio — from M3 micro-screws to M64 heavy hex structural bolts — in carbon steel (Grade 4.6 to 12.9), alloy steel (A193 B7 / B16), stainless steel (A2-70 / A4-80), brass, and titanium, conforming to the standards of DIN, ISO, ANSI/ASME, JIS, BS and GB with full traceability under the ISO 9001 and IATF 16949 quality systems.
Our catalog covers every fastener category used across heavy industry, construction, automotive, and energy:
DIN 933 / DIN 931 / ISO 4014 / ISO 4017 / ASTM A325 / A490. Partially and fully threaded hex head bolts for structural steel, machinery, and bridges. M6–M64.
DIN 912 / ISO 4762 / ASME B18.3. High-tensile Allen bolts up to Class 12.9. Ideal for hydraulic manifolds, engine assemblies, and tight-clearance machinery.
Studs DIN 975 / DIN 976, fully threaded rods, hex nuts (DIN 934), lock nuts (DIN 985 nylon-insert), flange nuts (DIN 6921). For flanges, engines, and tension assemblies.
Wedge anchors, sleeve anchors, chemical anchors, L-bolts, J-bolts, U-bolts, and foundation bolts. For concrete fastening, structural steel base plates, and sign / tower mounting.
Flat DIN 125 / spring DIN 127 / fender DIN 9021 / conical DIN 6796 / Nord-Lock wedge-lock pairs. Distribute load, prevent loosening, and protect mating surfaces.
A2-70 (304) / A4-80 (316) / B8 / B8M / B16 / Titanium Grade 2 & 5. For marine, chemical, food-grade, subsea, and cryogenic applications where corrosion is mission-critical.
Dafluid fasteners are qualified and in service across every load-bearing application worldwide:
Match strength class, material, and coating to your load, environment, and standards:
| Grade / Class | Tensile / Yield (min) | Standard & Material | Typical Application |
|---|---|---|---|
| Grade 8.8 (Metric) / SAE J429 Gr.5 | 800 / 640 MPa | ISO 898-1; medium-carbon steel, Q&T | General machinery, structural steel, agricultural |
| Grade 10.9 (Metric) / SAE J429 Gr.8 | 1,000 / 900 MPa | ISO 898-1; alloy steel 40Cr / SCM435, Q&T | Automotive chassis, heavy equipment, powertrain |
| Grade 12.9 (Metric) | 1,200 / 1,080 MPa | ISO 898-1; alloy steel SCM435 / 42CrMo, Q&T | Mining, wind turbines, presses, racing |
| A2-70 Stainless | 700 / 450 MPa | ISO 3506-1; 304 austenitic stainless | Food, pharma, general chemical, ≤500 ppm Cl⁻ |
| A4-80 Stainless | 800 / 600 MPa | ISO 3506-1; 316 / 316L austenitic stainless | Marine, offshore, chemical, ≤2,000 ppm Cl⁻ |
Need help specifying the right fastener for your load, environment, and standard? Contact our fastener engineering team with your application, torque requirement, and target grade — we'll return matched SKUs, dimensional drawings, and a formal quotation within 24 hours.
WashersConcave hole square washers are a type of hardware component that is used in various industries for fastening applications. These washers have a unique design, with a concave hole in the center and square shape around the edges. This design allows for a more secure and stable fastening of bolts and screws.
WashersSteel square gasket washers are a type of washer that is commonly used in various industries for sealing applications. These washers are made of steel and have a square shape, which allows them to provide a secure and tight seal when used with bolts or screws.
WashersSquare washers have a larger surface area than round washers with the same outside diameter. When applied to wood, square washers provide a great deal of friction. This type of gasket is wider and thicker than most round gaskets. The square outside diameter washers is suitable for wood construction, automotive engineering and machinery. Square washers are designed to eliminate rotation problems and are suitable for small Spaces that are incompatible with round washers.
WashersThe serrated lock washer is fitted on the bolt with the nut, which can play the role of locking and preventing loosening.
WashersGasket spring lock washers are essential in many mechanical and industrial applications. These specialized washers are designed to provide a secure and reliable connection between two surfaces while also preventing leaks and maintaining proper pressure.
WashersDIN126 Flat gasket round washers are a type of sealing washer that is commonly used in various industries. These washers are designed to provide a flat, smooth surface for distributing the load of a fastener, such as a bolt or screw, and to create a tight seal between the fastener and the surface it is being tightened against.
WashersDIN6916 Round Washers are a type of washer that conforms to the DIN6916 standard set by the Deutsches Institut für Normung (DIN), which is the German Institute for Standardization. These washers are specifically designed to be used with high-strength structural bolts to provide a larger bearing surface and prevent the bolt from pulling through the material.
ScrewsThreaded Nail Welded Eye Screws are specialized fasteners that combine the functions of a traditional screw with the added benefits of an eyelet for easy attachment. They are commonly used in construction, woodworking, and various industrial applications due to their strength and versatility.
ScrewsSelf-drilling screws are fasteners designed for a variety of construction and industrial applications. As the name suggests, these screws have a unique eye-shaped ring at one end that makes it easy to attach ropes, cables, or other fastening devices. The self-drilling ability of these screws means they can create their own pilot holes, making them very convenient to install on a variety of materials, including wood, metal, and concrete.
ScrewsEye Hook Screws, also known as eye bolts or screw eyes, are versatile fasteners designed with a circular eye at one end and a threaded screw at the other. They are commonly used to hang lightweight items like picture frames, plants, and decorations, offering a secure and easy way to attach objects to various surfaces. Whether for home or industrial use, Eye Hook Screws provide a reliable solution for a wide range of hanging tasks.
ScrewsBlack Zinc Square Slotted Flat Head Screws are specialized fasteners that serve a variety of purposes in construction, manufacturing, and DIY projects. Understanding their features, benefits, and applications can help determine whether they are the right choice for your needs.
ScrewsDouble-thread concrete screws are a type of fastener used in construction projects to securely attach materials to concrete surfaces. These screws have a unique design with two threads that help provide increased holding power and stability.
ScrewsFlat round inverted screws, also known as countersunk screws, are a type of fastener commonly used in woodworking, metalworking, and other industries. These screws have a flat head with a conical underside that is designed to sit flush with the surface it is screwed into.
ScrewsSquare neck screws, also known as carriage bolts or coach bolts, are a type of fastener commonly used in woodworking and construction. These screws have a square neck just below the head, which prevents them from turning when the nut is tightened. This design makes them ideal for applications where the bolt must remain stationary while the nut is tightened, such as attaching a hinge to a door or a latch to a gate.
ScrewsInternal Hex Head Galvanized Screws are a type of fastener that feature a hexagonal head with a recessed internal hex drive. These screws are commonly used in construction and woodworking projects due to their strong grip and resistance to corrosion.
ScrewsCSK Head Self Drilling Screws are a type of screws that are commonly used in construction and manufacturing industries. These screws have a flat head with a countersunk shape, which allows them to sit flush with the surface they are screwed into. The self-drilling feature of these screws means that they have a drill bit at the tip, allowing them to create their own pilot hole as they are screwed in.
