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| Customization: | Available |
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| Material: | Stainless Steel |
| Type: | Round Head |
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| DIN603 Standard Round Head Square Neck Carriage Bolt | |
| Material: | Carbon Steel, Stainless Steel, Brass etc. |
| Standards: | GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC |
| Size: | M5-M20 or non-standard as request & design |
| Finish: | Plain, Black, Zinc, Yellow Zinc, HDG, Dacromet, etc. |
| Thread Size d |
M5 | M6 | M8 | M10 | M12 | M16 | M20 | |
| P | Pitch | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 |
| b | L≤125 | 16 | 18 | 22 | 26 | 30 | 38 | 46 |
| 125 | 22 | 24 | 28 | 32 | 36 | 44 | 52 | |
| L>200 | / | / | 41 | 45 | 49 | 57 | 65 | |
| dk | max | 13.55 | 16.55 | 20.65 | 24.65 | 30.65 | 38.8 | 46.8 |
| min | 12.45 | 15.45 | 19.35 | 23.35 | 29.35 | 37.2 | 45.2 | |
| ds | max | 5 | 6 | 8 | 10 | 12 | 16 | 20 |
| min | 4.52 | 5.52 | 7.42 | 9.42 | 11.3 | 15.3 | 19.16 | |
| k1 | max | 4.1 | 4.6 | 5.6 | 6.6 | 8.75 | 12.9 | 15.9 |
| min | 2.9 | 3.4 | 4.4 | 5.4 | 7.25 | 11.1 | 14.1 | |
| k | max | 3.3 | 3.88 | 4.88 | 5.38 | 6.95 | 8.95 | 11.05 |
| min | 2.7 | 3.12 | 4.12 | 4.62 | 6.05 | 8.05 | 9.95 | |
| r1 | ≈ | 10.7 | 12.6 | 16 | 19.2 | 24.1 | 29.3 | 33.9 |
| r2 | max | 0.5 | 0.5 | 0.5 | 0.5 | 1 | 1 | 1 |
| r3 | max | 0.75 | 0.9 | 1.2 | 1.5 | 1.8 | 2.4 | 3 |
| s | max | 5.48 | 6.48 | 8.58 | 10.58 | 12.7 | 16.7 | 20.84 |
| min | 4.52 | 5.52 | 7.42 | 9.42 | 11.3 | 15.3 | 19.16 | |
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| Q1: What thread standards do you follow? |
| A1: Our screws comply with DIN, ISO, ANSI, and JIS standards, and can also be customized according to customer drawings. |
| Q2: What stainless steel grades do you supply for bolts? |
| A2: We supply multiple grades including A2-70, A2-80, A4-70, A4-80, 304, 316, and 410SS, suitable for different mechanical strength and corrosion-resistance requirements. |
| Q3: Do you provide samples before mass production? |
| A3: Yes, we offer free or low-cost samples for quality and dimension confirmation prior to order. |
| Q4: How do you control product quality? |
| A4: Every batch is tested for torque, hardness, thread precision, and salt spray corrosion resistance, following ISO 9001 quality system standards. |
| Q5: Do you offer OEM or customized production? |
| A5: Yes. We can produce screws according to samples, technical drawings, or specific drive/head combinations, and offer custom packaging and labeling. |
| Q6: What is the difference between A2 and A4 stainless steel bolts? |
| A6: A2 (304) is ideal for standard outdoor and industrial use, while A4 (316) contains molybdenum, offering higher corrosion resistance for marine, chemical, and salt-spray environments. |
| Q7: Will stainless steel bolts rust over time? |
| A7: Under severe chemical or chloride exposure, A2 may develop slight surface corrosion. A4/316 performs better in harsh environments. We also offer passivation treatment for enhanced protection. |
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