Bristol/Allen Countersunk Head Screw UNC Bcp UNC G8 in carbon steel, Grade 8, inch thread. 86 sizes available; sold by unit.
| SKU | Size | Price | Status | Qty | |
|---|---|---|---|---|---|
| VT-25458 | 1/8 X 3/8 | $ 216 | In stock | ||
| VT-25459 | 1/8 X 1/2 | $ 232 | In stock | ||
| VT-25460 | 1/8 X 5/8 | $ 242 | In stock | ||
| VT-25461 | 1/8 X 3/4 | $ 401 | In stock | ||
| VT-25462 | 1/8 X 1 | $ 638 | In stock | ||
| VT-25468 | 5/32 X 3/8 | $ 101 | In stock | ||
| VT-25469 | 5/32 X 1/2 | $ 210 | In stock | ||
| VT-25470 | 5/32 X 5/8 | $ 244 | In stock | ||
| VT-25471 | 5/32 X 3/4 | $ 255 | In stock | ||
| VT-25472 | 5/32 X 1 | $ 272 | In stock | ||
| VT-25473 | 5/32 X 1.1/4 | $ 338 | In stock | ||
| VT-25474 | 5/32 X 1.1/2 | $ 407 | In stock | ||
| VT-25463 | 6/32 X 3/8 | $ 71 | In stock | ||
| VT-25475 | 3/16 X 3/8 | $ 126 | In stock | ||
| VT-25464 | 6/32 X 1/2 | $ 92 | In stock | ||
| VT-25476 | 3/16 X 1/2 | $ 164 | In stock | ||
| VT-25465 | 6/32 X 5/8 | $ 120 | In stock | ||
| VT-25477 | 3/16 X 5/8 | $ 170 | In stock | ||
| VT-25466 | 6/32 X 3/4 | $ 142 | In stock | ||
| VT-25478 | 3/16 X 3/4 | $ 178 | In stock | ||
| VT-25467 | 6/32 X 1 | $ 188 | In stock | ||
| VT-25479 | 3/16 X 1 | $ 212 | In stock | ||
| VT-25480 | 3/16 X 1.1/4 | $ 210 | In stock | ||
| VT-25481 | 3/16 X 1.1/2 | $ 258 | In stock | ||
| VT-25482 | 3/16 X 2 | $ 348 | In stock | ||
| VT-25483 | 3/16 X 2.1/2 | $ 434 | In stock | ||
| VT-25484 | 1/4 X 3/8 | $ 180 | In stock | ||
| VT-25485 | 1/4 X 1/2 | $ 202 | In stock | ||
| VT-25486 | 1/4 X 5/8 | $ 163 | In stock | ||
| VT-25487 | 1/4 X 3/4 | $ 197 | In stock | ||
| VT-25488 | 1/4 X 1 | $ 226 | In stock | ||
| VT-25489 | 1/4 X 1.1/4 | $ 281 | In stock | ||
| VT-25490 | 1/4 X 1.1/2 | $ 319 | In stock | ||
| VT-25491 | 1/4 X 2 | $ 433 | In stock | ||
| VT-25492 | 1/4 X 2.1/2 | $ 712 | In stock | ||
| VT-25493 | 1/4 X 3 | $ 1.133 | In stock | ||
| VT-25494 | 5/16 X 3/8 | $ 364 | In stock | ||
| VT-25495 | 5/16 X 1/2 | $ 436 | In stock | ||
| VT-25496 | 5/16 X 5/8 | $ 443 | In stock | ||
| VT-25497 | 5/16 X 3/4 | $ 522 | In stock | ||
| VT-25498 | 5/16 X 1 | $ 448 | In stock | ||
| VT-25499 | 5/16 X 1.1/4 | $ 533 | In stock | ||
| VT-25500 | 5/16 X 1.1/2 | $ 726 | In stock | ||
| VT-25501 | 5/16 X 2 | $ 896 | In stock | ||
| VT-25502 | 5/16 X 2.1/2 | $ 1.095 | In stock | ||
| VT-25503 | 5/16 X 3 | $ 1.318 | In stock | ||
| VT-25504 | 5/16 X 3.1/2 | $ 2.000 | In stock | ||
| VT-25505 | 5/16 X 4 | $ 2.611 | In stock | ||
| VT-25506 | 3/8 X 1/2 | $ 586 | In stock | ||
| VT-25507 | 3/8 X 5/8 | $ 736 | In stock | ||
| VT-25508 | 3/8 X 3/4 | $ 622 | In stock | ||
| VT-25509 | 3/8 X 1 | $ 657 | In stock | ||
| VT-25510 | 3/8 X 1.1/4 | $ 948 | In stock | ||
| VT-25511 | 3/8 X 1.1/2 | $ 806 | In stock | ||
| VT-25512 | 3/8 X 2 | $ 1.083 | In stock | ||
| VT-25513 | 3/8 X 2.1/2 | $ 1.699 | In stock | ||
| VT-25514 | 3/8 X 3 | $ 1.638 | In stock | ||
| VT-25515 | 3/8 X 3.1/2" | $ 2.546 | In stock | ||
| VT-25516 | 3/8 X 4 | $ 3.677 | In stock | ||
| VT-25517 | 7/16 X 1 | $ 1.269 | In stock | ||
| VT-25518 | 7/16 X 1.1/4 | $ 1.488 | In stock | ||
| VT-25519 | 7/16 X 1.1/2 | $ 1.462 | In stock | ||
| VT-25520 | 7/16 X 2 | $ 1.577 | In stock | ||
| VT-25522 | 1/2 X 3/4 | $ 933 | In stock | ||
| VT-25523 | 1/2 X 1 | $ 1.030 | In stock | ||
| VT-25524 | 1/2 X 1.1/4 | $ 1.215 | In stock | ||
| VT-25525 | 1/2 X 1.1/2 | $ 1.578 | In stock | ||
| VT-25526 | 1/2 X 2 | $ 1.817 | In stock | ||
| VT-25527 | 1/2 X 2.1/2 | $ 2.128 | In stock | ||
| VT-25528 | 1/2 X 3 | $ 2.741 | In stock | ||
| VT-25529 | 1/2 X 3.1/2 | $ 3.176 | In stock | ||
| VT-25530 | 1/2 X 4 | $ 3.791 | In stock | ||
| VT-25531 | 5/8 X 1.1/4 | $ 2.426 | In stock | ||
| VT-25532 | 5/8 X 1.1/2 | $ 2.687 | In stock | ||
| VT-25533 | 5/8 X 2 | $ 3.416 | In stock | ||
| VT-25534 | 5/8 X 2.1/2 | $ 4.254 | In stock | ||
| VT-25535 | 5/8 X 3 | $ 5.246 | In stock | ||
| VT-25536 | 5/8 X 3.1/2 | $ 5.862 | In stock | ||
| VT-25537 | 5/8 X 4 | $ 6.702 | In stock | ||
| VT-25538 | 3/4 X 1.1/4" | $ 5.991 | In stock | ||
| VT-25539 | 3/4 X 1.1/2 | $ 5.150 | In stock | ||
| VT-25540 | 3/4 X 2 | $ 5.638 | In stock | ||
| VT-25541 | 3/4 X 2.1/2 | $ 6.764 | In stock | ||
| VT-25542 | 3/4 X 3 | $ 7.900 | In stock | ||
| VT-25543 | 3/4 X 3.1/2 | $ 9.521 | In stock | ||
| VT-25544 | 3/4 X 4 | $ 10.107 | In stock |
Prices per unit, before VAT. Availability is confirmed in the formal quote.
| Material | acero al carbono |
| Grade / Standard | Grado 8 |
| Thread system | pulgadas |
| Family | Socket head cap screws & set screws |
The Bristol/Allen countersunk head screw is an industrial fastening element with Bristol or Allen drive, used in joints where the head must sit flush with the surface. TECTUL offers it in carbon steel Grade 8, UNC inch thread, and UNC thread reference when applicable to the product design. Selection must start from the thread, usable length, head type, and compatibility with the existing threaded part or nut. Unlike the Bristol socket head cap screw, it requires countersinking in the part to house the head. For this lot there are actual sizes such as 1/2 X 1 to 1/8 X 5/8, sold by unit. It is an option for maintenance, fabrication, equipment assembly, spare parts, and assemblies where precise, removable fastening with good tool access is required.
| Actual lot size | Sales unit |
|---|---|
| 1/2 X 1 | unit |
| 1/2 X 1.1/2 | unit |
| 1/2 X 1.1/4 | unit |
| 1/2 X 2 | unit |
| 1/2 X 2.1/2 | unit |
| 1/2 X 3 | unit |
| 1/2 X 3.1/2 | unit |
| 1/2 X 3/4 | unit |
| 1/2 X 4 | unit |
| 1/4 X 1 | unit |
| 1/4 X 1.1/2 | unit |
| 1/4 X 1.1/4 | unit |
| 1/4 X 1/2 | unit |
| 1/4 X 2 | unit |
| 1/4 X 2.1/2 | unit |
| 1/4 X 3 | unit |
| 1/4 X 3/4 | unit |
| 1/4 X 3/8 | unit |
| 1/4 X 5/8 | unit |
| 1/8 X 1 | unit |
| 1/8 X 1/2 | unit |
| 1/8 X 3/4 | unit |
| 1/8 X 3/8 | unit |
| 1/8 X 5/8 | unit |
We dispatch to Bogotá, Medellín, Cali, Barranquilla, and all of Colombia. Request a quote via WhatsApp for the Bristol/Allen countersunk head screw, indicating size, thread, material, quantity, and whether you need equivalence with DIN, ISO, or inch thread.
The price depends on the size, material, thread, standard, and requested quantity. Send us the exact reference via WhatsApp and TECTUL will quote according to lot availability.
Compared with the Bristol socket head cap screw, the countersunk version sits flush, but requires preparing the conical seat; it is not a direct replacement if the part is not countersunk.
It is installed with a Bristol/Allen key or compatible tool, verifying thread pitch, available depth, head or tip seating, and the torque defined by the joint design.
This page corresponds to carbon steel Grade 8 with UNC inch thread. The standard reference indicated for selection is UNC thread when applicable.
You can quote the sizes listed in the product technical table. If you need an unpublished length, confirm availability with the sales team.
Uncoated carbon steel must be protected if it will be exposed to moisture, chemicals, or weather.
Updated: July 22, 2026
