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Hex Tap Bolts are precision-engineered fasteners designed to create or engage threads directly into pre-drilled holes in metal, plastic, or engineered assemblies without requiring a separate nut. These bolts combine the load-bearing strength of a hex head design with the functionality of self-threading engagement, making them essential in fabrication, machinery assembly, HVAC systems, and structural steel installations.
Manufactured in compliance with DIN, ISO, and ASTM standards, Hex Tap Bolts are widely used in environments requiring secure fastening under vibration, torque, and dynamic load conditions. They are available in stainless steel, carbon steel, and alloy steel variants depending on corrosion exposure and mechanical requirements.
In industrial supply chains, KK Fasteners supports OEMs and global distributors with precision-machined Hex Tap Bolts engineered for dimensional accuracy, repeatable performance, and export-grade quality consistency across multiple sectors.
| Parameter | Specification |
|---|---|
| Material Options | Stainless Steel (SS 304, SS 316), Carbon Steel, Alloy Steel |
| Grade Options | A2-70, A4-80, 4.6, 8.8, 10.9 |
| Size Range | M3 to M24 / #6 to 1" |
| Thread Type | Metric (ISO), UNC, UNF |
| Standards | DIN 933, DIN 931, ISO 4017, ASTM A307 |
| Surface Finish | Plain, Zinc Plated, Hot Dip Galvanized, Black Oxide |
| Head Type | Hex Head |
| Thread Configuration | Partial Thread / Full Thread (as per requirement) |
| Tensile Strength | Up to 1040 MPa (depending on grade) |
|
Nominal or Basic Product Diameter Click on size to search products |
Width Across Flats (F) |
Width Across Corners (G) | Head Height (H) | |||||
| Basic | Max | Min | Max | Min | Basic | Max | Min | |
| 1/4 | 7/16 | .438 | .428 | .505 | .488 | 5/32 | .163 | .150 |
| 5/16 | 1/2 | .500 | .489 | .577 | .557 | 13/64 | .211 | .195 |
| 3/8 | 9/16 | .562 | .551 | .650 | .628 | 15/64 | .243 | .226 |
| 7/16 | 5/8 | .625 | .612 | .722 | .698 | 9/32 | .291 | .272 |
| 1/2 | 3/4 | .750 | .736 | .866 | .840 | 5/16 | .323 | .302 |
| 9/16 | 13/16 | .812 | .798 | .938 | .910 | 23/64 | .371 | .348 |
| 5/8 | 15/16 | .938 | .922 | 1.083 | 1.051 | 25/64 | .403 | .378 |
| 3/4 | 1-1/8 | 1.125 | 1.100 | 1.299 | 1.254 | 15/32 | .483 | .455 |
| 7/8 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 37/64 | .604 | .531 |
| 1 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 43/64 | .700 | .591 |
| 1-1/4 | 1-7/8 | 1.875 | 1.812 | 2.165 | 2.066 | 27/32 | .876 | .749 |
| Nominal Screw Size |
Nominal Screw Length | |||||
| Up to 1" | Over 1" - 2-1/2" | Over 2-1/2" - 4" | Over 4" - 6" | Longer than 6" | ||
| 1/4 - 3/8 | -.03 | -.04 | -.06 | -.10 | -.18 | |
| 7/16 & 1/2 | -.03 | -.06 | -.08 | -.10 | -.18 | |
| 9/16 - 3/4 | -.03 | -.08 | -.10 | -.10 | -.18 | |
| 7/8 and 1 | - | -.10 | -.14 | -.16 | -.20 | |
| 1-1/4 | - | -.12 | -.16 | -.18 | -.22 | |
Hex Tap Bolts are used in mechanical assemblies where secure thread formation and high torque resistance are required. They are commonly selected for structural, automotive, and industrial fabrication systems.
Hex Tap Bolts are produced using cold forging and precision thread rolling processes to ensure high structural integrity and consistent dimensional accuracy. Advanced CNC machining is used for critical dimensional control, especially in high-grade industrial fasteners.
Each batch undergoes strict quality validation including hardness testing, tensile strength verification, thread gauge inspection, and surface finish evaluation. Traceability is maintained through batch-level documentation to ensure full compliance with industrial procurement standards.
KK Fasteners integrates ISO 9001-certified quality systems across production lines, ensuring every bolt meets international mechanical fastening requirements before dispatch to global clients.
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Hex Tap Bolts are threaded fasteners with a hexagonal head designed to engage or form threads directly into pre-drilled holes. They eliminate the need for nuts and are widely used in machinery, automotive assemblies, and structural steel applications where strong, vibration-resistant fastening is required.
They are manufactured in stainless steel (SS 304, SS 316), carbon steel, and alloy steel. Stainless steel offers excellent corrosion resistance, carbon steel provides high tensile strength for structural use, and alloy steel is preferred for heavy-load industrial applications requiring enhanced durability.
Hex Tap Bolts are commonly produced according to DIN 933, DIN 931, ISO 4017, and ASTM A307 standards. These standards ensure consistent dimensional accuracy, mechanical strength, and global compatibility across industrial and engineering applications.
Selection depends on load requirements, environmental exposure, and installation conditions. Stainless steel is ideal for corrosive or marine environments, while high-strength carbon steel grades are suitable for structural and mechanical assemblies under controlled conditions.
A reliable supplier should offer ISO-certified production, material traceability, dimensional accuracy, and proven export capability. Consistent quality control and technical documentation are also key indicators. KK Fasteners supports global buyers with engineered fastening solutions and export-grade compliance.
Hex Tap Bolts play a critical role in structural reliability across industrial systems where precision and strength cannot be compromised. With controlled manufacturing processes and export-grade quality systems, KK Fasteners supports global procurement teams with consistent, specification-driven fastening solutions.
For technical drawings, bulk pricing, or customized requirements, connect with the engineering team to initiate your order or request a detailed specification sheet.
