Here is the rewritten and improved English version of your content, with additional details added to reach over 500 characters. The text has been restructured for clarity, natural flow, and readability:
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1. **Certifications:** ISO, ROHS, SGS
2. **Standards Available:** DIN, ANSI, ASTM, JIS, BSW
3. **Strength Grades:** 4.8, 8.8, 10.9, 12.9, A2-70, A4-70, A4-80
4. **Finishing Options:** Yellow Zinc Plated, Blue Zinc Plated, White Zinc Plated, Galvanized, HDG, Chromate, Dacromet
5. **Materials Offered:** Carbon Steel, Stainless Steel (SS304, SS316), A2, A4
6. **Sizes:** M2 - M100, Lengths: 5 - 300mm, MOQ: 500pcs, Ports: Shenzhen, Shanghai
7. **Packaging Options:** Plastic Bags + Chipboard Boxes
Production Gallery
Company Profile
Packing Details
Certifications
FAQ
**Q:** Are you a trading company or manufacturer?
**A:** We are a factory with OEM services available.
**Q:** What is your delivery time?
**A:** Usually 7–10 days if in stock, or 15–20 days if not in stock, depending on order quantity.
**Q:** Do you offer samples? Are they free?
**A:** Yes, we can provide samples at no cost, but shipping charges apply.
**Q:** What are your payment terms?
**A:** 30% T/T in advance, balance before shipment, or L/C.
If you have any other questions, feel free to contact us below. --- Let me know if you'd like this formatted for a website or product page!
- Model No.: DIN7991
- Type: Countersunk Head Bolt
- Connection: Standard Bolt
- Standards: DIN, GB, ANSI, JIS
- Certifications: ISO, RoHS, SGS
- Available Materials: Stainless Steel, Carbon Steel
- Brand: JR
- Specifications: M3 - M24
- HS Code: 3917400000
- Material: Carbon Steel
- Groove Type: Hexagon
- Head Style: Countersunk
- Grade: 10.9
- Available Standards: DIN, ISO, JIS, ANSI, BSW
- Size Range: 3 - 24mm
- Packaging: Plastic Bag + Carton Box + Wooden Pallet
- Origin: China
1. **Certifications:** ISO, ROHS, SGS
2. **Standards Available:** DIN, ANSI, ASTM, JIS, BSW
3. **Strength Grades:** 4.8, 8.8, 10.9, 12.9, A2-70, A4-70, A4-80
4. **Finishing Options:** Yellow Zinc Plated, Blue Zinc Plated, White Zinc Plated, Galvanized, HDG, Chromate, Dacromet
5. **Materials Offered:** Carbon Steel, Stainless Steel (SS304, SS316), A2, A4
6. **Sizes:** M2 - M100, Lengths: 5 - 300mm, MOQ: 500pcs, Ports: Shenzhen, Shanghai
7. **Packaging Options:** Plastic Bags + Chipboard Boxes
| Product Name | Carbon Steel Black Oxide Hex Socket CSK/Countersunk Head Screw |
| Material | Carbon Steel |
| Color | Black |
| Standards | DIN, GB, ISO, JIS, BA, ANSI |
| Grade | Gr4.8, Gr8.8, Gr9.9, Gr10.9, Gr12.9 |
| Finish | Black Oxide |
| Thread Type | Coarse, Fine |
| Application | Construction Industry, Machinery |
Production Gallery
Company Profile
Packing Details
Certifications
FAQ
**Q:** Are you a trading company or manufacturer?
**A:** We are a factory with OEM services available.
**Q:** What is your delivery time?
**A:** Usually 7–10 days if in stock, or 15–20 days if not in stock, depending on order quantity.
**Q:** Do you offer samples? Are they free?
**A:** Yes, we can provide samples at no cost, but shipping charges apply.
**Q:** What are your payment terms?
**A:** 30% T/T in advance, balance before shipment, or L/C.
If you have any other questions, feel free to contact us below. --- Let me know if you'd like this formatted for a website or product page!
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