ASME B18.2.1 (T8):2012 Hex Flange Screw is suitable for direct fastening into tapped holes or threaded components. The flanged head provides a larger bearing area, helping protect the mating surface and improve clamp-load distribution.
Compared with a standard hex screw, this product can reduce the need for washers, making it useful where space is limited, assembly steps must be simplified, or a clean external appearance is desired. It can be used for equipment covers, brackets, light structures, and industrial components.
Selection should consider thread size, engagement depth, material compatibility, and finish. For thin plates or softer base materials, the balance between flange bearing area and tightening force should be managed to prevent local surface damage.

Dimensions unit: mm
| Thread size | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 9/16 | 5/8 | 3/4 | |
| d | |||||||||
| PP | UNC | 20 | 18 | 16 | 14 | 13 | 12 | 11 | 10 |
| UNF | 28 | 24 | 24 | 20 | 20 | 18 | 18 | 16 | |
| ds | Max. | 0.25 | 0.3125 | 0.375 | 0.4375 | 0.5 | 0.5625 | 0.625 | 0.75 |
| Min. | 0.245 | 0.3065 | 0.369 | 0.4305 | 0.493 | 0.5545 | 0.617 | 0.741 | |
| s | Max. | 0.375 | 0.5 | 0.5625 | 0.625 | 0.75 | 0.8125 | 0.9375 | 1.125 |
| Min. | 0.367 | 0.489 | 0.551 | 0.612 | 0.736 | 0.798 | 0.922 | 1.1 | |
| e | Max. | 0.433 | 0.577 | 0.65 | 0.722 | 0.866 | 0.938 | 1.083 | 1.299 |
| Min. | 0.409 | 0.548 | 0.618 | 0.685 | 0.825 | 0.895 | 1.034 | 1.234 | |
| dc | Max. | 0.56 | 0.68 | 0.81 | 0.93 | 1.07 | 1.19 | 1.33 | 1.59 |
| c | Min. | 0.04 | 0.05 | 0.06 | 0.07 | 0.08 | 0.09 | 0.1 | 0.11 |
| k | Max. | 0.28 | 0.32 | 0.39 | 0.46 | 0.51 | 0.57 | 0.62 | 0.73 |
| b | L≤6 | 0.75 | 0.875 | 1 | 1.125 | 1.25 | 1.375 | 1.5 | 1.75 |
| L>6 | 1 | 1.125 | 1.25 | 1.375 | 1.5 | 1.625 | 1.75 | 2 | |
| r | Max. | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.045 | 0.045 | 0.045 |
| Thousand pieces of steel weigh ≈kg | Reference | - | - | - | - | - | - | - | - |
| Thread length b | Reference | - | - | - | - | - | - | - | - |
① The nominal thread length b is a reference size and is only used for calculation. When the nominal length of the bolt is L ≤ 6 in, b = 2d + 0.25; when L > 6 in, b = 2d + 0.5.
FAQ
A: We take every inquiry seriously. On working days, we will respond within 12 hours after receiving your inquiry.
A: We focus on the production of fasteners made of carbon steel, stainless steel, and low-alloy steel. We are a direct manufacturer with independent production capacity. ASME B18.2.1 (T8):2012 Hex Flange Screw Factory. We own several fastener manufacturing facilities and have an international sales department, providing full-process services from production to export.
A: Customized production is our core business. We can develop and manufacture products based on the drawings or samples you provide.
A: Yes. In addition to custom products, we also produce general construction machinery parts (GET parts) for equipment such as excavators, including bucket teeth, tooth holders, corner blades, pins, clips, bolts and nuts. ASME B18.2.1 (T8):2012 Hex Flange Screw Wholesale.
A: We have 12 energy-efficient and environmentally friendly modern production lines (including one fully automatic shell molding line and four heat treatment lines), with an annual production capacity exceeding 20,000 tons, enabling us to steadily meet various order requirements.
A: Trade terms (such as FOB, CIF, etc.) are confirmed when quoting. For batch production, we typically require a 30% deposit, with the balance paid against the copy of the bill of lading. T/T is the main payment method accepted, and L/C can also be negotiated.
A: We are only 35 km away from Shanghai Port and Ningbo Port, so sea freight is the main mode of transportation, which is convenient and efficient. For urgent deliveries, we can also arrange air freight via Ningbo or Shanghai airports.
About Us
Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010. ASME B18.2.1 (T8):2012 Hex Flange Screw Suppliers in China.
The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.
With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.
Better Fastener is committed to becoming a trusted fastener supplier for customers with reliable product quality, reasonable prices and on-time deliveryNEWS