M3–M14 304 Stainless Steel Hex Socket Countersunk Screw and Washer Set
Youjia Metals supplies sets of hex socket countersunk screws, flat washers, and spring washers in 304 stainless steel. These sets support industrial equipment, outdoor facilities, building assemblies, OEM projects, and bulk procurement. Kit contents and installation requirements are confirmed for each order; this product is not a hex bolt and nut kit.
Matched Screws and Washers
The set includes countersunk hex socket screws, flat washers, and spring washers. The hex socket supports installation with an appropriate Allen key. A countersunk head can sit flush in a correctly prepared countersink; washer use and placement must be reviewed against the joint design and mating surface.
304 Stainless Steel Material
The original material specification is 304 stainless steel / A2-70, with nominal 18% chromium and 8% nickel. Material grade, property class, and available documentation are confirmed for the order. Stainless steel offers corrosion resistance but is not completely rust-proof; marine, high-temperature, chemical, and other demanding exposures require application-specific review.
Technical Parameters: M3 to M14
- Components: Hex socket countersunk screws, flat washers, and spring washers.
- Metric sizes: M3, M4, M5, M6, M8, M10, M12, and M14.
- Threads: Standard metric coarse threads; confirm thread pitch and mating requirements before ordering.
- Material: 304 stainless steel / A2-70 as originally specified; final material and property class are subject to order confirmation.
- Minimum order: 50 pieces as originally listed; confirm kit quantities and the required size mix in the quotation.
- Standard: Confirm the countersunk-head screw standard, dimensions, and washer standards against the approved drawing. The previous DIN 912 reference conflicts with the confirmed countersunk product description and is not used as a confirmed product standard.
- Strength: The original text references tensile strength ≥520 MPa alongside A2-70. These statements require reconciliation against the specified property class and test documentation; they are not an assembly load rating.
- Tolerance: Any requested ±0.005 mm dimensional tolerance requires drawing and manufacturing review; it is not a blanket tolerance for every kit component.
- Compliance documents: Any requested RoHS or REACH documentation must be confirmed for the specific order; certification is not presumed.
Industrial and Outdoor Applications
- Industrial equipment: Machine tools, conveyor systems, automated equipment, mechanical repairs, and machinery assemblies.
- Marine and rigging: Ship fittings, sailboat hardware, deck equipment, coastal infrastructure, structural steel, and cable-tensioner assemblies, subject to corrosion and loading review.
- Renewable energy: Solar PV mounting systems, solar panel mounts, and wind turbine maintenance.
- Construction and general assembly: Door and window installation, structural connections, architectural projects, furniture assembly, and automotive repairs.
Drawing-Based Custom Processing and Bulk Supply
Send STP or DWG drawings for review of screw length, countersunk geometry, thread, washer thickness, size mix, and packaging. Requests for SS316 material, non-standard processing, OEM supply, and distributor quantities are reviewed against the drawing and project requirements.
Core Advantages and Installation Review
- Vibration considerations: Spring washers are an available kit component, but do not guarantee prevention of loosening. Joint design, tightening method, and service conditions must be reviewed.
- Corrosion resistance: Select the material and finish for the actual environment, with maintenance requirements considered.
- Hex socket installation: Confirm the required tool and assembly torque for the chosen size and property class.
- Flush mounting: Confirm countersink dimensions and washer placement for the mating parts.
Quality Review and Quotation
Confirm the component list, drawing revision, material, size mix, thread pitch, dimensions, finish, quantity, inspection requirements, and delivery destination before production approval. Available material and inspection documents are agreed for each order.
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