Railroad Rail Bolts Definition:
Railroad rail bolts, also called fang bolts or rail anchor bolts, are used to fix rails and rail chairs on sleepers, or to fix rail joints on connecting rails. The rail bolt is a bolt that passes through a hole in the sleeper and has a toothed nut embedded in the lower surface of the sleeper.
Generally speaking, the size of rail bolts varies according to the requirements of the rail segment. The appropriate rail bolt diameter and length can be determined by checking the applicable railway standards.
Railroad Rail Bolts Application Standard:
According to the basic rules and rail standards, each rail joint needs to be bolted, and at least two rail bolts in each rail are tightened to produce approximately 400 foot pounds of torque, and approximately 25,000 to 30,000 pounds of tension. bolt.
1. The bolts in use must be of appropriate size and fastened in place.
2. The bolt must be installed together with the AREMA spring washer, and the nut must be installed against the spring washer.
3. Bolts and nuts must be installed alternately on the inside and outside of the rail.
4. When the bolt and joint bar are removed, the connection area of the rail and the contact surface of the joint bar must be cleaned, and the connecting rod and bolt threads must be lubricated.
5. Safety standards require that it allows operation on all rails with missing or invalid bolts
Railroad Rail Bolts Types:
1. T bolt
Size: M16 – M48
Material: Q235, 35#, 45#, 40Cr
Grade: 4.6, 5.6, 8.8, 10.9
Surface: plain, oxidized black, zinc, hot-dip galvanized, painted.
Standards: BS, AS, AREMA, DIN, ISO, GB, etc.
2. Hexagon rail bolts
Size: M16 – M48
Material: Q235, 35#, 45#, 40Cr
Grade: 4.6, 5.6, 8.8, 10.9
Surface: plain, oxidized black, zinc, hot-dip galvanized, painted.
Standards: BS, AS, AREMA, DIN, ISO, GB, etc.
3. Square head track bolts
Size: M16 – M48
Material: Q235, 35#, 45#, 40Cr
Grade: 4.6, 5.6, 8.8, 10.9
Surface: plain, oxidized black, zinc, hot-dip galvanized, painted.
Standards: BS, AS, AREMA, DIN, ISO, GB, etc.
4. Fish Bolt
Size: M16 – M48
Material: Q235, 35#, 45#, 40Cr
Grade: 4.6, 5.6, 8.8, 10.9
Surface: plain, oxidized black, zinc, hot-dip galvanized, painted.
Standards: BS, AS, AREMA, DIN, ISO, GB, etc.
5. Tunnel bolts
Types: round thread method blue bolts, special curve bolts, special pitch spear bolts, etc.
Material: Q235, 35#, 45#, 40Cr
Grade: 4.6, 5.6, 8.8, 10.9
Surface: plain, oxidized black, zinc, hot-dip galvanized, painted.
6.Double headed rail bolts
Size: M16 – M48
Material: Q235, 35#, 45#, 40Cr
Grade: 4.6, 5.6, 8.8, 10.9
Surface: plain, oxidized black, zinc, hot-dip galvanized, painted.
Standards: BS, AS, AREMA, DIN, ISO, GB, etc.
7. ASTM A325 bolts (high-strength bolts)
Size: M12-M36
Material: 35#, 45#, 40 boron steel, 20 manganese titanium boron steel, 35CrMoA
Grade: 8.8s, 10.9s
Surface: plain, oxidized black, zinc, hot-dip galvanized, painted.
Standard: ASTM
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