AS1252 Structural High Strength Hex Bolts
AS1252 Structural High Strength Hex Bolts are designed for structural steel connections requiring high strength, stability and dependable performance. Manufactured in accordance with AS 1252 requirements, these heavy hex bolts are engineered to provide secure clamping force and reliable fastening performance in critical structural assemblies.
Featuring a heavy hex head design and excellent mechanical properties, AS1252 high strength bolts are commonly used with compatible nuts and washers in steel structures, bridges, infrastructure projects and industrial facilities. Their accurate dimensions and consistent quality make them suitable for applications where safety, durability and long-term connection reliability are essential.
Specification:
AS1252 Structural High Strength Hex Bolts are specified according to AS 1252 requirements, covering important characteristics such as bolt dimensions, thread specifications, head dimensions, mechanical properties and performance requirements. These specifications ensure that the bolts can provide consistent strength and reliable fastening performance in structural steel connections.
The specifications of AS1252 high strength hex bolts include heavy hex head design, metric thread configurations, high tensile strength grades and various surface treatment options to meet different application requirements. Combined with compatible nuts and washers, these bolts are widely used for secure and durable structural assemblies in construction and engineering projects.
| Product name | AS1252 HEX BOLT |
|---|---|
| Diameter | M12-M64 |
| Length | 30mm-500mm |
| Thread | Coarse |
| Head Type | Large Hex Head |
| Class | 8.8 |
| Manufacturing Process | wire drawing, cold heading/hot forging, thread rolling, heat treatment, surface treatment |
| Surface treatment | Hot-Dip Galvanized |
| Application Industry | Construction/Machinery/Automotive/Infrastructure/Electrical and Electronics/Furniture/Marine and Offshore |
Mechanical property:
| Mechanical or physical property | |||
|---|---|---|---|
| Tensile strength, Rm, MPa | nom. | 800 | 800 |
| min. | 800 | 830 | |
| Stress at 0,2 % nonproportional elongation, R p0,2, MPa | nom. | 640 | 640 |
| min. | 640 | 660 | |
| Percentage elongation after fracture for machined test pieces, A, % | min. | 12 | 12 |
| Percentage reduction of area after fracture for machined test pieces, Z, % | min. | 52 | |
| Vickers hardness, HV F W 98 N | min. | 250 | 255 |
| max. | 320 | 335 | |
| Rockwell hardness, HRC | min. | 22 | 23 |
| max. | 32 | 34 | |
The materials and mechanical properties of high-strength steel bolts shall be as given in AS/NZs 4291.1 for property class 8.8.
Surface treatment:
Surface finish Unless otherwise specified, high-strength steel bolts shall be supplied, hot-dip galvanized in accordance with AS 1214. Uncoated bolts shall be in the dull black as heat-treated condition.
- RELATED BOLTS LISTS:
- HEX BOLTS
- HEAVY HEX BOLTS
- DIN931 HEX BOLTS
- DIN6914 HEX BOLTS
- ASME B 18.2.1 HEX BOLTS
- A325 HEAVY HEX BOLTS
- A490 HEAVY HEX BOLTS
- RELATED NUTS LIST:
- HEX NUTS
- HEAVY HEX NUTS
- ISO4032 HEX NUTS
- DIN934 HEX NUTS
- A194 HEAVY HEX NUTS
- A563 HEAVY HEX NUTS
- THREADED ROD LIST:
- DIN975 THREADED RODS
- A193 B7 STUD BOLTS
Dimension Chart:
The dimension chart of AS1252 Structural High Strength Hex Bolts provides detailed information on the standard dimensions of these high strength structural fasteners, including nominal diameter, thread specifications, head dimensions, across flats and bolt length. Accurate dimensional control is essential to ensure proper fit and reliable performance in structural steel connections.
| Mon | M16 | M20 | M22 | M24 | M27 | M30 | M36 |
| P | 2 | 2.5 | 2.5 | 3 | 3 | 3.5 | 4 |
| da max | 18.7 | 23.24 | 25.24 | 27.64 | 31.24 | 34.24 | 41 |
| ds max | 16.7 | 20.84 | 22.84 | 24.84 | 27.84 | 30.84 | 37 |
| ds min | 15.3 | 19.16 | 21.16 | 23.16 | 26.16 | 29.16 | 35 |
| e min | 29.56 | 37.29 | 39.55 | 45.2 | 50.85 | 55.37 | 66.44 |
| k max | 10.75 | 13.4 | 14.9 | 15.9 | 17.9 | 19.75 | 23.55 |
| k min | 9.25 | 11.6 | 13.1 | 14.1 | 16.1 | 17.65 | 21.45 |
| r min | 0.6 | 0.8 | 0.8 | 1 | 1.2 | 1.2 | 1.5 |
| s max | 27 | 34 | 36 | 41 | 46 | 50 | 60 |
| s min | 26.16 | 33 | 35 | 40 | 45 | 49 | 58.8 |
Quality Control of AS1252 hex bolts:
In a world where connections matter, Ningbo Teng Qi Fasteners is more than just a hex bolts supplier and manufacturer. We are architects of stability, builders of relationships, and champions of your success. From skyscrapers that reach for the sky to machines that power industries, our hex bolts form the backbone of progress. When you choose Ningbo Teng Qi Fasteners, you choose unwavering quality, exceptional service, and a partner who understands that every bolt holds a piece of your vision.
| Inspect Item | Detail |
|---|---|
| Dimensional Inspection | Critical dimensions such as bolt diameter, head width, head height, bolt length and thread length are checked using calibrated measuring equipment. Inspection is carried out according to the applicable dimensional standard or customer drawings to ensure consistent fit and interchangeability. |
| Thread Inspection | External threads are inspected using calibrated GO and NO-GO thread gauges to verify thread profile, pitch and dimensional conformity. Additional measurements can be performed when tighter thread tolerances or specific customer requirements apply. |
| Mechanical Testing | Mechanical properties are verified according to the specified material and strength grade. Depending on the applicable standard, testing may include tensile strength, yield strength, hardness and other required mechanical tests, with test results documented in the relevant inspection or material reports. |
| Surface & Coating Inspection | Bolt surfaces are inspected for appearance, defects, coating uniformity and other specified requirements. For coated fasteners, coating thickness and adhesion or other applicable coating characteristics can be checked according to the specified surface treatment standard. |
| Final Inspection & Testing | Before shipment, finished hex bolts undergo final inspection to confirm dimensions, thread quality, mechanical requirements, surface condition, marking and packaging. Inspection records and test reports can be provided according to the order specification and customer requirements. |