How do I identify an A325 bolt?
All A325 type 1 bolts are simply marked with “A325” and the manufacturer’s logo. The exceptions are as follows: A325 type 3 weathering steel bolts are underlined (A325). Fully threaded A325 structural bolts are designated with a “T” (A325T).
What is the difference between A325 and A490 bolts what type of structures are each preferably used?
A490 bolts are more susceptible to brittle fracture than A325 bolts which are 120/105 minimum tensile strength steel. To minimize the risk of brittle fracture A490 bolts have both a minimum and a maximum tensile strength specified. FHWA recommends that A325 bolts be used wherever possible.
What is the difference between A325 and Grade 5 bolts?
Grade 5 bolts specify bolts from . 25 to 1.5 inches in diameter; the A325 bolts cover sizes from . 5 to 1.5 inches in diameter, which means that ASTM A449 should be used for bolts over the 1.5-inch size. Finally, the thread lengths required are different for each type of bolt.
What is Type 3 steel?
Type 3 is a quenched and tempered weathering steel bolting material with minimum tensile requirement of 105 ksi, yield 81 ksi and maximum hardness requirement of 34 HRC.
How can you tell if a bolt is structural?
The identification of high-strength structural bolt and nut assemblies can be readily made from the bolt head and nut markings (see Ref. 6.1). In addition, a distinguishing feature is the larger bolt head and nut of the high-strength structural bolt compared to the commercial bolt.
What grade is a A325 bolt?
SAE grade 5 bolt
The A325 bolt strength, or SAE grade 5 bolt strength, is usually used for structural bolting projects.
What does 3 marks on a bolt head mean?
Grade 5 bolt
The markings can identify the standard to which the bolt was made. For instance, if a bolt head contains three radial lines, then it’s a Grade 5 bolt. If it contains five radial lines, then the bolt is Grade 8.
Do A325 bolts rust?
A325 type 3 structural bolts are made from weathering steel, but what does this mean in regards to its resistance to corrosion? In other words, does it rust? To put it simply, yes the steel rusts.
What is the difference between an A325 and A490 bolt?
Answer (1 of 2): Grade A325 can be made of Type 1 medium carbon steel or Type 3 weathering steel. An important distinction between A325 and A490 is that it A325 Type 1 bolts can be galvanized. A325 bolts have a minimum tensile strength of 120,000 PSI for one inch or fewer diameters and 105,000 PS…
What is the difference between A325 and Grade 8 bolts?
A325 bolts are typically manufactured from a medium carbon steel (although they can be made from an alloy) while SAE grade 8 bolts are made from a medium carbon alloy steel. Grade 8 bolts are significantly stronger than an A325. An ASTM specification with similar strength properties to grade 8 is ASTM A490.
How to determine A325 structural bolt length?
Itis the sum of the thicknesses of all the partsbeing joined exclusive of washers • Thread length is the threaded portion of the bolt • Boltlength is the distance frombehind the bolt head to the end of the bolt (AISC& NISD 2000) Parts of the Bolt Assembly
How many A325 bolts to spot check?
Sample 2 bolt, washer & nut assemblies (02560.60 (a)) 2. Assemble fastener with 3-5 threads within the grip 3. Snug tight (10% of Required Fastener Tension in Table 560-1); Tolerance= -0 kips, +2 kips 4. Mark the bolt, nut & plate 5. Tighten to Required Fastener Tension & record torque (torque must not exceed T=0.25PD) (P in lbs, D in ft) 6.