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Rail bolt,also called track bolt, it is a kind of fasteners to fix the steel rails to the sleepers. In general, the rail bolt has two parts, the head and screws. Track bolt and nuts are two closed parts. Together with the nuts, the rail bolt can fasten the rails at a joint.
Rail bolt,also called track bolt, it is a kind of fasteners to fix the steel rails to the sleepers. In general, the rail bolt has two parts, the head and screws. Track bolt and nuts are two closed parts. Together with the nuts, the rail bolt can fasten the rails at a joint. The rail bolt and some others fasteners like rail clamp, rail spike, rail clips and the like constitute the rail fastening system. As a rail fastener, it plays a big role in guiding the train. Besides, all the fastening system bears the enormous pressure of trains and their loads. So the each fastener should have enough high strength and stability to ensure the train runs safely and steady even if the train at the highest speeds.
|
Bolt Type |
Material |
Grade |
Size (Dia.) |
Surface Finish |
Standard/Certificate |
|
Button head oval neck track bolt |
Carbon steel |
8.8, 10.9 |
M5-M42 |
Zinc plated |
- |
|
Diamond neck track bolt |
Q235, 35#, 45# |
4.6, 5.6, 8.8, 10.9 |
UIS864-2 |
Plain (oiled), Oxide black, Zinc, HDG, wax, bitumen, Dacromet, Sherardizing |
- |
|
Rail bolt NF F50-008 |
Q235, 35#, 45#, 40Cr |
4.6, 5.6, 8.8, 10.9 |
- |
Plain (oiled), Oxide black, Zinc, HDG |
ISO9001:2008 |
|
Clip bolt with BSW thread |
Q235, 35#, 45#, 40Cr |
4.6, 5.6, 8.8, 10.9 |
- |
Plain (oiled) |
ISO9001:2008 |
|
Fish bolt for rail joints |
Q235, 35#, 45#, 40Cr, C45 |
4.8, 8.8, 10.9 |
22×135, 24×135, 24×145 |
Plain (oiled), Oxide black, Zinc, HDG |
BS, R54 rail, AS1085.4-1999, Russian, AREMA, etc. |
|
Clip bolt HS26 & HS32 |
Q235, 35#, 45# |
4.6, 5.6, 8.8 |
- |
Plain, black painting or upon customer requirement |
UIS864-2, UIC, GB, BS, DIN, GOST, ISO, etc. |
|
Clamp bolt and inserted bolt for Russia |
Q235, 35#, 45# |
4.6, 5.6, 8.8 |
M22 ×75, M22 ×175 |
Plain, black painting or upon customer requirement |
- |
|
Anchor bolt |
Q235 |
4.6, 5.6, 8.8 |
- |
Plain, black painting or upon customer requirement |
- |
|
T-bolt |
Q235, 45# |
4.6, 5.6, 8.8, 10.6, 12.9 |
M5-48 |
Natural or according to customers' requests |
GB37-88 |
|
Special bolt |
Q235, 35#, 45# |
4.6, 5.6, 8.8 |
- |
Plain, black painting or upon customer requirement |
- |
|
Tunnel bolt |
Available by customers' drawings and samples |
4.6, 4.8, 8.8, 10.9 |
- |
Plain (oil), black, zinc, HDG, etc. |
- |
Functions of Railway Bolts in Railway System
In traditional railway bolts once the shaft is wound into the end grain and joined to the second member is necessary to place a washer and a nut on to the end of the bolt shaft and tighten, here lies the difficulty and frustration but not with the Railway bolt. The Railway bolt housing has a special open channel feature in the housing which allows the housing to simply drop of the bolt shaft and commence tightening using a hex bit or Allen key without fiddling and trying to start a nut in a restrictive small hole with the further difficulty in trying to tighten the nut.
What causes the rail bolt looseness?
There are two reasons:
The quality of the rail bolt. Whatever the model, material, and the surface coating, that all can influence the service life.
Implementation. Please use the torque wrench to fasten the rail bolt with 25N.m and guarantee the wrench rotates more than 60 degrees. If not reach these requirements, the implementation is not up to the standard.
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