SS304 Hex Socket Countersunk Head Bolt (DIN7991)

Here is the rewritten and improved English version of your content, ensuring it's more natural, engaging, and over 500 characters: ---
  • Model No.: DIN7991
  • Type: Countersunk Head Bolt
  • Head Style: Flat Countersunk
  • Grade: A2-70
  • Certification: ISO, RoHS, SGS
  • Available Material: Stainless Steel, Carbon Steel, Aluminum
  • Strength Grades: 4.8, A2-70, A4-70, A4-80
  • Length Range: 3–80mm
  • Packing Options: Plastic Bags + Chipboard Carton + Plywood Pallet
  • Shipping Package: Plastic Bag (500 pcs), Carton Outer, Wood Crated
  • Origin: China
  • Material: Stainless Steel
  • Connection Type: Standard Bolt
  • Standards: DIN, ANSI, GB, JIS, BSW, GOST
  • Finish: Passivation
  • Available Standards: DIN, ISO, JIS, ANSI, BSW
  • Finishing Options: Zinc Plated, Galvanized, Nickel Plated
  • Size Range: 1.6–12mm
  • Ports: Shenzhen, Shanghai
  • Brand: JR
  • Specifications: GB, ANSI, DIN
  • HS Code: 731815100
**Key Features of DIN7991 Countersunk Head Bolt:** 1. **Certifications:** ISO, ROHS, SGS 2. **Standards Available:** DIN, ISO, JIS, ANSI, BSW 3. **Materials Offered:** Aluminum, Brass, Steel, Stainless Steel 4. **Surface Treatments:** Galvanized, Zinc Plated, Nickel Plated 5. **Sizes & Lengths:** 1.6–12mm in diameter, 3–80mm in length, MOQ: 500pcs 6. **Packaging:** Plastic Bags + Chipboard Carton + Wooden Pallet 7. **Delivery Time:** 7–15 days for stocked sizes 8. **Sample Policy:** Free samples available for standard sizes 9. **Documentation:** Certificates and MTC reports provided with samples and bulk orders 10. **Quality Assurance:** High-quality products at competitive prices; OEM designs accepted **What You Can Get from Our DIN7991 Countersunk Bolts:** We provide fast delivery, quality assurance, and full support throughout the process. Whether you need standard or custom parts, we are here to meet your needs.
Main Products
BOLT DIN933, DIN931, DIN419, DIN558, DIN7990, DIN6922, ASME/ANSI B 18.2.1, ASME/ANSI B 18.2.3.1M, GB, BSW, ISO Hex Bolt, Carriage Bolt, Heavy Hex Bolt, Flange Head Bolt, Anchor Bolt, etc.
Nut DIN934, Heavy Hex Nut, 2H Nut, DIN555, Flange Nut, Cap Nut, Nylon Nut, etc.
Screw Hex Screw, Self-Drilling Screw, Self-Tapping Screw, Drywall Screw, Pan Head Screw, Button Head Screw, Machine Screw, Chipboard Screw, Furniture Screw, Wood Screw, etc.
Washer Flat Washer, Spring Washer, Lock Washer, Square Washer, Spring Lock Washer, Plain Washer, etc.
Thread Rod Threaded Rod DIN976, Threaded Bar DIN975, Stud Bolt, B7 Stud Bolt, etc.
We Specialize in Non-Standard or Customized Items Based on Your Design!
Available Materials Carbon Steel, Stainless Steel, Duplex Stainless Steel, Brass, Copper, Plastic, Aluminum
Surface Treatment Zinc Plated / Galvanized, Nickel Plated, HDG, Copper Plated, Anodized, Polished, Powder Coating, Geomet, Dacromet, Passivation, Electrophoresis
Equipment Cold Forging Machine, Thread Rolling Machine, CNC Machine, Lathe, Grinding Machine, Milling Machine, Drilling Machine, Casting Machine
Processing Methods Cold Forging, Stamping, Rolling, Bending, Casting, Extrusion, Milling, Welding, Turning
Processing Drawings
Format		 .jpg, .pdf, .dwg, .igs, .stp, etc.
Trade Terms EXW, FOB, CIF, DDP, CFR, or as discussed
Payment Terms T/T, L/C, Western Union
Packaging Plastic Bag + Chipboard Carton + Plywood Pallet with Belt and Film
--- Let me know if you'd like a version tailored for a specific platform (e.g., product page, email, or brochure).

For SUMITOMO Cylinder Seal Kit

Maintenance of Sumitomo hydraulic cylinder seals


Hydraulic Cylinder Sealing Kit 40


Daily maintenance and upkeep can effectively solve the sealing problem of hydraulic cylinders, extend the service life of hydraulic cylinders, and improve the work efficiency of construction machinery.
1. Regularly check the wear of the hydraulic cylinder seals, and if severe wear is found, it should be replaced in a timely manner.
2. Clean the hydraulic cylinder seals to prevent impurities such as dust and sand from entering the interior of the seals.
3. Use appropriate hydraulic oil and avoid using expired or non compliant hydraulic oil to avoid damage to the hydraulic cylinder seals.
4. Avoid using hydraulic cylinders under excessive pressure or load to avoid damage to the seals.
5. Regularly check the liquid level and pressure of the hydraulic cylinder to ensure its normal operation and avoid damage to the sealing components due to hydraulic cylinder failures.
6. When the hydraulic cylinder is stopped for a long time, regular maintenance should be carried out, such as applying anti rust oil, to prevent aging or deformation of the sealing components.


For Sumitomo Cylinder Seal Kit, For Sumitomo Center Joint Seal Kit, Sumitomo Center Joint Seal Kit, Sumitomo Bucket Cylinder Seal Kit

Safe Seal Technology Co., Ltd. , https://www.sprsealkits.com