Railroad tie lag bolts, also known as sleeper screws, rail lag screw or lag bolts, are medium or large metal screws used to fix rail tie plates or rails.
This kind of screws is always fixed in the holes drilled in the sleepers, sometimes with embedded plastic dowels. They are usually used for railroad tracks for wooden sleepers, especially in the United States and Canada.
The Production Process of rail lag screws:
*Raw material
*Brushed
*Bar cutting
*Head molding
*Cutting
*Thread rolling
*Heat treatment
*Surface treatment
*Examination
*Package
*Transportation
As for the types of sleeper screws, the Ss series is the best-selling, and there are many sizes to choose from. In addition, there are square head screws, hex screws, double head screws, dog spikes, wood screws and so on.
Types of Railroad Tie Lag Bolts:
1. SS25, SS35, SS36 sleeper screws
Size: 24×L, L=150mm to 270mm
Grade: 5.6, 8.8
Standards: ISO898-1, UIC864-1, NF F500-50
Surface treatment: ordinary oiling, sand blasting oiling, black oxide, galvanizing, hot-dip galvanizing, dacromet and sherardizing.
2.AS screws
Mechanical properties: UTS550-700N/mm2, 15% elongation.
Standard: BS64 normal strength
Surface treatment: ordinary oiling, sand blasting oiling, black oxide, galvanizing, hot-dip galvanizing, dacromet and sherardizing.
3.24×185mm alloy steel screws
Size: 24×185mm
Material: Alloy steel
Rating: 8.8
Standard: GB/T3098.1
Surface treatment: ordinary oiling, sand blasting oiling, black oxide, galvanizing, hot-dip galvanizing, dacromet and sherardizing.
4.Tr screws
Size: Tr22×L, Tr23×L, L=115mm to 165mm, step length is 5mm
Grade: 4.6, 5.6, 8.8, 10.9
Standard: NF F500-15, UIC864-1, ISO898-1
Surface treatment: ordinary oiling, sandblasting oiling, black oxide, galvanizing, hot-dip galvanizing, dacromet, sherardizing
5. Wooden screw
Size: Diameter 15/16", 1", L, order 16×115, 19×115. Dia. 3/4'' ×L, L=12''
Material: low carbon steel Q235
Mechanical properties: minimum tensile strength 740000psi
Surface treatment: black oil, dipping wax
6.Chex screws
Size: 25×190mm 24×180mm
Grade: 4.6, 5.6, 8.8
Standard: AS1085.18
Surface treatment: HDG
Railroad Tie Lag Bolts Manufacturer:
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