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Standard: ASTM A325/A325M
Scope
The ASTM A325 specification covers high strength heavy hex structural bolts from ½” diameter through 1-1/2” diameter. These bolts are intended for use in structural connections and therefore have shorter thread lengths than standard hex bolts. Refer to the Structural Bolts page of our site for thread lengths and other related dimensions.
This specification is applicable to heavy hex structural bolts only. For bolts of other configurations and thread lengths with similar mechanical properties, see Specification A 449.
Bolts for general applications, including anchor bolts, are covered by Specification A 449. Also refer to Specification A 449 for quenched and tempered steel bolts and studs with diameters greater than 1-1/2" but with similar mechanical properties.
Types
Connection Types
Mechanical Properties
Recommended Nuts and Washers
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Production levels include: 6.8, 8.8, 10.9, 12.9, 10.9HV, 10.9HR, 8.8HR, B7, B7M, B16, L7, L7M, L4 3, B 8, B8 M, 660A \ B \ C \ D, N4400, 410, 420, 600, 625, 655, 665, 718, 2205, 2507, F51, F53, C276, 17-4, 825, 925, N08020
Production range: Diameter M12~M100 (1/2 "~4"); Bolt length 25-200mm; The length of the tooth strip is 55-8800mm.
01
High Quality
The company has advanced production and inspection equipment, participates in the formulation of several international standards, and has abundant technical strength. It has won 5 national invention patents and 15 national utility model patents.
02
Advanced Equipment
The company has the most advanced automated stereoscopic warehouse storage system and 20tons - level AGV intelligent handling robots for fastener industry in Ningbo area.
03
Professional Team
The company has its own R & D team and several senior technical and quality management personnel.
04
Custom Service
Our company has complete production & testing equipment. Can develop and produce products according to the drawings or samples provided by customers
The main equipment includes: 4 heat treatment Lines such as 80 meter long multi roll furnace, No. 6 mesh belt furnace, induction furnace and other heat treatment equipments; a robot - automatic hot forging bolt production machine; 21 full - automatic thread rolling machines; 3 multi - station cold forging machines; 9 chamfering - stamping machines; 1 dedicated production line for windpower anchor bolts; 3 turning - milling compound machines; 1 model - 100 peeling machine; 1 model - 40 peeling machine; 1 model - 100 straightening and calendering machine. The inspection equipment includes: 200 tons and 100 tons tensile strength testing machines; a fully automatic impact testing machines; an ultrasonic flaw detector; a magnetic particle flaw detectors; an eddy current flaw detector; 3 hardness test machines; a torque testing machine; a transverse vibration testing machine; a German Spectro desktop spectrometer; an American Niton handheld spectrometer; a projector; a metallographic analysis microscope, and other advanced laboratory equipment and dedicated vacuum-tight chamber .
We can provide a variety of fasteners, in line with national standards, the Ministry of Chemical Industry standards, the United States ASTM standards
Complete certificate: API-20E, API-20F, NORSOK M650/ISO17782，TUV Nande CE certification, TUV Nande AD2000 certification,ISO9001, ISO14001, ISO45001, to meet the needs of customers in many fields.
Diameter M12~M100 (1/2 "~4"); Bolt length 25-200mm; The length of the tooth strip is 55-8800mm.
During the development process, the company has always focused on the construction and improvement of the quality management system.
200 ton and 100 ton tensile strength testing
fully automatic impact testing machines
hardness machines
Magnetic particle testing machine permeation chamber