Essential Characteristics
Characteristics to be assessed: angle to failure during tightening, axial load, compression load for bolting assemblies with direct tension indicators, calibrated preload for bolting assemblies with calibrated preload.
There are two types of bolting assemblies:
- Type HR (HRC): designed to obtain ductility predominantly by plastic elongation of the bolt (minimum nut height ≥ 0,8 D and thread length of the bolt according to ISO 888)
- Type HV: designed to obtain ductility predominantly by plastic deformation of the engaged threads (nut height at approximately 0,8 D with short thread length)
Property class (bolting assemblies)
Characteristics to be assessed: elongation (bolts), tensile strength (bolts), strength under wedge loading (bolts), tensile yield strength (bolts), proof load (nuts and bolts), impact strength (bolts), hardness (bolts, nuts, washers and, if provided, direct tension indicators), compression load for direct tension indicators.
Reference standards: ISO 898-1 (bolts); ISO 898-2 (nuts); EN 14399-6
(washers).
Product grade:
Bolts and nuts: tolerances on dimensions and shape in accordance with ISO 4759-1. Thread tolerance (ISO 6g, 6H, 6AZ)
Washers: tolerances on dimensions and shape in accordance with ISO 4759-3
Direct tension indicators: features and tolerances in accordance with EN14399-9
STRUCTURAL BOLTING ASSEMBLIES
Production process for high-strength
structural bolting
Post time: Nov-24-2022