GOST R 52644 High Strength Structural Bolts

GOST R 52644 High Strength Structural Bolts are designed for steel structures where bolted joints need to withstand high loads and maintain a controlled clamping force. The enlarged width across flats provides greater wrench engagement, while the hexagon head is designed for installation with standard structural bolting tools.

These bolts are intended for structural connections where the bolt, nut, and connected components work together as a preloaded fastening system. Correct selection therefore involves the bolt diameter and length as well as the required strength class, nut, washer, and joint configuration. GOST R 52644-2006 specifies high-strength structural bolts with large width across flats and corresponds to ISO 7411. We can supply the required sizes, strength classes, materials, and surface finishes, with production and inspection arranged according to the specified structural fastening requirements.

Specification:

GOST R 52644-2006 specifies high-strength hexagon bolts with large width across flats for structural bolting. The standard defines the bolt configuration, dimensions, materials, strength classes, and technical requirements needed for structural fastening. It covers metric sizes and property classes including 6.8, 8.8, 9.8, 10.9, and 12.9.

Mechanical properties are specified according to GOST R 52643 and tested in accordance with GOST R 52627. Depending on the selected property class, the requirements cover tensile strength, yield or proof stress, elongation, hardness, and other applicable mechanical characteristics. The required values are determined according to the bolt grade, material, and nominal diameter. The external metric thread is manufactured according to GOST 24705 and GOST 16093, with a 6g tolerance field. Product tolerances are controlled according to GOST R ISO 4759-1. GOST R 52644-2006 corresponds to ISO 7411:1984, providing an additional reference for international structural fastening requirements.