Caliper Overseas is a well-established Round Head Square Neck Bolts manufacturer and supplier in India, providing superior quality fastening solutions for various industrial applications. Round Head Square Neck Bolts have a dome-shaped, rounded head with a square neck beneath which keeps them from rotating when installed into square holes. These bolts are commonly available in different types or forms based on application requirements. The most recognized standards include ANSI B18.2.1, DIN-603, IS:2609, BS-4933, AS-1390, and ISO-8677.
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These bolts have extensive applications in woodwork, construction, machines and cars because of their anti-rotation design and simplified installation. They provide high grip, corrosion-resistant, and a long service life. Whether you're building a structure or assembling equipment, these bolts provide reliable fastening. For high-performance and durable fasteners, choose quality you can trust. Reach out now to explore our product range and experience quality you can rely on.
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Round Head Square Neck Bolts Specification
| Dimensional Standards | ANSI B18.2.1, DIN-603/IS:2609/BS-4933/AS-1390/ISO-8677 |
|---|---|
| Metric Size | M10 to M100 |
| Imperial Size | 3/8 to 8" |
| Threads | UNC, UNF, ISO, BSW & ACME. |
| Length | 3/8" to 8″(ASME B18.5) |
| Standards | ASME,BS,DIN,ISO,UNI,DIN-EN |
| Bolts Types | Round Head Square Neck Bolts, Flat Round Head Bolts |
| Threads | METRIC, BSW, UNC, UNF, BSF or as required |
| Unified Thread Standard (UTS) | UNC, UNF, NPT, UNS, UNEF, NPTF |
| Application | Wind Tower, Nuclear Power, Railway, Automotive Industry, Construction, Electronic Industry |
| Bolts Packaging | Cartoon Box / Wooden Pallet / Wooden Box / Thread Protector |
| Bolts Forming | Hot Forged Bolts & Cold Forged Bolts |
| Certification | Dual Certified As per ASTM & ASME Codes |
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Round Head Square Neck Bolt Dimensions DIN 603 / ISO 8677
| Nom. Dia. (d) | M6 | M8 | M10 | M12 | M16 | M20 | |
| Thread Pitch | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | |
| Thread Length (b) | L < 125mm | 18 | 22 | 26 | 30 | 38 | 46 |
| 125-200mm | 24 | 28 | 32 | 36 | 44 | 52 | |
| L > 200mm | – | 41 | 45 | 49 | 57 | 65 | |
| dk | Max. | 16.55 | 20.65 | 24.65 | 30.65 | 38.8 | 46.8 |
| f | Max. | 4.6 | 5.6 | 6.6 | 8.75 | 12.9 | 15.9 |
| k | Max. | 3.88 | 4.88 | 5.38 | 6.95 | 8.95 | 11.05 |
| v | Max. | 6.48 | 8.58 | 10.58 | 12.7 | 16.7 | 20.84 |
| L | WEIGHT IN KG/1000 PCS | ||||||
| 16 | 6.90 | ||||||
| 20 | 7.60 | 13.80 | 22.70 | ||||
| 25 | 8.50 | 15.40 | 25.20 | ||||
| 30 | 9.60 | 17.00 | 27.70 | 45.70 | |||
| 35 | 10.70 | 19.00 | 30.20 | 49.40 | |||
| 40 | 11.80 | 21.00 | 32.70 | 53.10 | |||
| 45 | 12.90 | 23.00 | 35.80 | 56.80 | |||
| 50 | 14.00 | 25.00 | 38.90 | 61.20 | 119.00 | ||
| 55 | 15.10 | 26.90 | 42.00 | 65.60 | 126.00 | ||
| 60 | 16.20 | 28.90 | 45.10 | 70.00 | 133.00 | ||
| 65 | 17.30 | 30.90 | 48.20 | 74.40 | 141.00 | ||
| 70 | 18.40 | 32.90 | 51.30 | 78.80 | 149.00 | 247.00 | |
| 80 | 20.60 | 36.80 | 57.50 | 87.00 | 165.00 | 272.00 | |
| 90 | 22.80 | 40.80 | 63.70 | 96.00 | 181.00 | 297.00 | |
| 100 | 25.00 | 44.80 | 69.90 | 105.00 | 197.00 | 322.00 | |
| 110 | 27.20 | 48.80 | 76.10 | 114.00 | 213.00 | 347.00 | |
| 120 | 29.40 | 52.80 | 82.30 | 123.00 | 229.00 | 372.00 | |
| 130 | 31.60 | 56.80 | 88.50 | 132.00 | 245.00 | 397.00 | |
| 140 | 32.80 | 60.80 | 95.00 | 141.00 | 261.00 | 422.00 | |
| 150 | 35.00 | 64.80 | 101.00 | 150.00 | 277.00 | 447.00 | |
| 160 | 107.00 | 159.00 | 293.00 | 497.00 | |||
| 180 | 119.00 | 177.00 | 325.00 | 547.00 | |||
| 200 | 131.00 | 195.00 | 357.00 | 597.00 | |||
DIN 603 Round Head Square Neck Bolts Weight Chart
| LENGTH | D I A M E T E R | ||||
| 1/4" | 5/16" | 3/8" | 7/16" | 1/2" | |
| 1" | 1.07 | 1.859 | 2.844 | 4.322 | 6.165 |
| 1.1/4" | 1.243 | 2.05 | 3.125 | 4.708 | 6.667 |
| 1.1/2" | 1.397 | 2.335 | 3.492 | 5.102 | 7.163 |
| 1.3/4" | 1.551 | 2.581 | 3.846 | 5.631 | 7.776 |
| 2" | 1.706 | 2.825 | 4.198 | 6.112 | 8.432 |
| 2.1/4" | 1.864 | 3.071 | 4.554 | 6.588 | 9.058 |
| 2.1/2" | 2.023 | 3.316 | 4.907 | 7.072 | 9.671 |
| 2.3/4" | 2.182 | 3.561 | 5.258 | 7.564 | 10.309 |
| 3" | 2.34 | 3.805 | 5.612 | 8.039 | 10.941 |
| 3.1/2" | 2.653 | 4.296 | 6.274 | 8.993 | 12.225 |
| 4" | 2.971 | 4.785 | 7.022 | 9.96 | 13.477 |
| 4.1/2" | 3.287 | 5.274 | 7.728 | 10.917 | 14.706 |
| 5" | 3.605 | 5.767 | 8.446 | 11.905 | 15.974 |
| 5.1/2" | 3.922 | 6.258 | 9.158 | 12.853 | 17.241 |
| 6" | 4.241 | 6.748 | 9.862 | 13.812 | 18.519 |
| 7" | 15.674 | 20.921 | |||
| 8" | 17.606 | 23.364 | |||
Weight in kg per 100 Pcs in MM sizes.
| Length | M5 | M6 | M8 | M10 | M12 | M16 | M20 |
| 16 | 4 | 6.9 | |||||
| 20 | 4.5 | 7.6 | 13.8 | 22.7 | |||
| 25 | 5.1 | 8.5 | 15.4 | 25.2 | |||
| 30 | 5.9 | 9.6 | 17 | 27.7 | 45.7 | ||
| 35 | 6.7 | 10.7 | 19 | 30.2 | 49.4 | ||
| 40 | 7.5 | 11.8 | 21 | 32.7 | 53.1 | ||
| 45 | 8.3 | 12.9 | 23 | 35.8 | 56.8 | ||
| 50 | 9.1 | 14 | 25 | 38.9 | 61.2 | 119 | |
| 55 | 9.9 | 15.1 | 26.9 | 42 | 65.6 | 126 | |
| 60 | 10.7 | 16.2 | 28.9 | 45.1 | 70 | 133 | |
| 65 | 11.5 | 17.3 |
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