What constitutes a round head square neck bolt, and how is it distinguished from other bolts?
A fastener commonly used in various industries and construction applications, a flanged button head cap screw has got an entire rounded top of its head while there is a squared section beneath that part of the fasteners. At times, the squared sections may have some chiselled edges on their sides to make it easier for them to fit into the square holes or slots on the material being fastened. This feature becomes particularly advantageous when one needs to establish a secure tight bond that does not allow for any movement such as with wood structures or heavy machinery components.
In comparison to other bolts such as hex bolts or carriage bolts, Round Head Square Neck Bolts have different styles of heads and necks thus making them stand out. The round head provides a smooth face which looks good aesthetically while at the same time guarantees non-rotation via the square neck making these types favored for jobs where appearance, rigidity and dependable fixture are critical.
What are some common applications of roundhead square neck bolts?
Roundhead bolts, with square necks, are widely used in many industries and applications because of their original design and reliable fastening characteristics. One of the main uses is in construction where these bolts are needed to hold together wooden beams, joists and frameworks among other things such as houses, bridges, commercial buildings etc. They are commonly employed in manufacturing environments especially when assembling heavy machinery, farm equipment and industrial plants.
In the automotive industry roundhead square neck bolts also help secure critical parts thus ensuring its structural integrity and safety. Due to their resistance to rotation and ability to create long-lasting connections, they are suitable for use in woodworking tasks like fixing furniture parts or cabinetry. A good number of industries prefer using roundhead square neck bolts due to their versatility plus reliability given that secure fastening is crucial.
| 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 |
| 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 | |||
| 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 |
Round Head Square Neck Bolts in Distillery Plants
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Round Head Square Neck Bolts in Power Plants
Round Head Square Neck Bolts in Refineries
Round Head Square Neck Bolts in Petrochemical Plants
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