Headless Bristol/Allen Set Screw UNF Bsc UNF G8 in carbon steel, Grade 8, inch thread. 59 sizes available; sold by unit.
| SKU | Size | Price | Status | Qty | |
|---|---|---|---|---|---|
| VT-24274 | 3/16 X 3/16 | $ 177 | In stock | ||
| VT-24275 | 3/16 X 1/4 | $ 236 | In stock | ||
| VT-24276 | 3/16 X 5/16 | $ 257 | In stock | ||
| VT-24277 | 3/16 X 3/8 | $ 291 | In stock | ||
| VT-24278 | 3/16 X 1/2 | $ 364 | In stock | ||
| VT-24279 | 3/16 X 5/8 | $ 684 | In stock | ||
| VT-24280 | 3/16 X 3/4 | $ 841 | In stock | ||
| VT-24281 | 3/16 X 1 | $ 1.132 | In stock | ||
| VT-24282 | 3/16 X 1.1/4 | $ 2.263 | In stock | ||
| VT-24283 | 3/16 X 1.1/2 | $ 2.886 | In stock | ||
| VT-24284 | 3/16 X 2 | $ 5.685 | In stock | ||
| VT-24285 | 1/4 X 3/16 | $ 155 | In stock | ||
| VT-24286 | 1/4 X 1/4 | $ 195 | In stock | ||
| VT-24287 | 1/4 X 5/16 | $ 286 | In stock | ||
| VT-24288 | 1/4 X 3/8 | $ 318 | In stock | ||
| VT-24289 | 1/4 X 1/2 | $ 345 | In stock | ||
| VT-24290 | 1/4 X 5/8 | $ 541 | In stock | ||
| VT-24291 | 1/4 X 3/4 | $ 648 | In stock | ||
| VT-24292 | 1/4 X 1 | $ 1.100 | In stock | ||
| VT-24293 | 1/4 X 1.1/4 | $ 2.272 | In stock | ||
| VT-24294 | 1/4 X 1.1/2 | $ 2.936 | In stock | ||
| VT-24295 | 1/4 X 2 | $ 4.279 | In stock | ||
| VT-24296 | 5/16 X 1/4 | $ 604 | In stock | ||
| VT-24297 | 5/16 X 5/16 | $ 707 | In stock | ||
| VT-24298 | 5/16 X 3/8 | $ 777 | In stock | ||
| VT-24299 | 5/16 X 1/2 | $ 796 | In stock | ||
| VT-24300 | 5/16 X 5/8 | $ 811 | In stock | ||
| VT-24301 | 5/16 X 3/4 | $ 995 | In stock | ||
| VT-24302 | 5/16 X 1 | $ 1.022 | In stock | ||
| VT-24303 | 5/16 X 1.1/4 | $ 1.708 | In stock | ||
| VT-24304 | 5/16 X 1.1/2 | $ 1.856 | In stock | ||
| VT-24305 | 5/16 X 2 | $ 1.888 | In stock | ||
| VT-24306 | 3/8 X 3/8 | $ 1.609 | In stock | ||
| VT-24307 | 3/8 X 1/2 | $ 2.004 | In stock | ||
| VT-24308 | 3/8 X 5/8 | $ 3.325 | In stock | ||
| VT-24309 | 3/8 X 3/4 | $ 4.098 | In stock | ||
| VT-24310 | 3/8 X 1 | $ 5.836 | In stock | ||
| VT-24311 | 3/8 X 1.1/4 | $ 6.328 | In stock | ||
| VT-24312 | 3/8 X 1.1/2 | $ 7.005 | In stock | ||
| VT-24313 | 3/8 X 2 | $ 9.338 | In stock | ||
| VT-24314 | 7/16 X 1/2 | $ 1.564 | In stock | ||
| VT-24315 | 7/16 X 5/8 | $ 1.910 | In stock | ||
| VT-24316 | 7/16 X 3/4 | $ 2.293 | In stock | ||
| VT-24317 | 7/16 X 1 | $ 4.130 | In stock | ||
| VT-24318 | 7/16 X 1.1/4 | $ 5.034 | In stock | ||
| VT-24319 | 7/16 X 1.1/2 | $ 6.508 | In stock | ||
| VT-24320 | 7/16 X 2 | $ 9.690 | In stock | ||
| VT-24321 | 1/2 X 1/2 | $ 806 | In stock | ||
| VT-24322 | 1/2 X 3/4 | $ 1.120 | In stock | ||
| VT-24323 | 1/2 X 1 | $ 1.636 | In stock | ||
| VT-24324 | 1/2 X 1.1/4 | $ 2.560 | In stock | ||
| VT-24325 | 1/2 X 1.1/2 | $ 3.320 | In stock | ||
| VT-24326 | 1/2 X 2 | $ 4.745 | In stock | ||
| VT-24327 | 5/8 X 3/4 | $ 6.470 | In stock | ||
| VT-24328 | 5/8 X 1 | $ 6.779 | In stock | ||
| VT-24329 | 5/8 x 1 x 1/4 | $ 7.112 | In stock | ||
| VT-24330 | 5/8 X 1.1/2 | $ 7.735 | In stock | ||
| VT-24331 | 5/8 X 2 | $ 8.933 | In stock | ||
| VT-24332 | 5/8 X 2.1/2 | $ 21.716 | 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 headless Bristol/Allen set screw is an industrial fastening element with Bristol or Allen drive, used in hidden fastening, set screws, shafts, pulleys, and component adjustment. TECTUL offers it in carbon steel Grade 8, UNF fine inch thread, and UNF 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. It differs from a Bristol socket head cap screw because it remains embedded or flush, without protruding from the part. For this lot there are actual sizes such as 1/2 X 1 to 3/16 X 3/16, 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 1/2 | unit |
| 1/2 X 2 | unit |
| 1/2 X 3/4 | 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 1/4 | unit |
| 1/4 X 2 | unit |
| 1/4 X 3/16 | unit |
| 1/4 X 3/4 | unit |
| 1/4 X 3/8 | unit |
| 1/4 X 5/16 | unit |
| 1/4 X 5/8 | unit |
| 3/16 X 1 | unit |
| 3/16 X 1.1/2 | unit |
| 3/16 X 1.1/4 | unit |
| 3/16 X 1/2 | unit |
| 3/16 X 1/4 | unit |
| 3/16 X 2 | unit |
| 3/16 X 3/16 | unit |
We dispatch to Bogotá, Medellín, Cali, Barranquilla, and all of Colombia. Request a quote via WhatsApp for the headless Bristol/Allen set 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 a Bristol socket head cap screw, this format works as a set screw and leaves no external head; it is chosen to secure shafts, pulleys, or parts where the screw must remain hidden.
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 UNF fine inch thread. The standard reference indicated for selection is UNF 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
