What is Variable Thread Sleeper Screw
Oct 23, 2025
The variable thread sleeper screw is a specially designed railway fastener used to securely fix rails to sleepers. Compared with traditional threaded screws, the variable thread design features different thread pitches along the shank, providing more uniform clamping force and higher pull-out resistance when securing rails. This design effectively absorbs longitudinal and lateral vibrations from train operations, reduces track loosening and wear, and ensures long-term track stability.
|
Type |
Dimensions norinnales(mm) |
|||||||||
|
d |
I |
a |
a1 |
b |
C |
e |
f |
9 |
Z |
|
|
Tirefond V20-135 |
20 |
135 |
19 |
17 |
30 |
29 |
15 |
12 |
50 |
1.08 |
|
Tirefond V23-115 |
23 |
115 |
23 |
21 |
10 |
31 |
16 |
12,5 |
52 |
0.92 |
|
Tirefond V23-135 |
23 |
135 |
23 |
21 |
30 |
31 |
16 |
12,5 |
52 |
1.08 |
|
Tirefond V23-155 |
23 |
155 |
23 |
21 |
50 |
31 |
16 |
12,5 |
52 |
1.24 |
|
Tirefond V23-215 |
23 |
215 |
23 |
21 |
110 |
31 |
16 |
12,5 |
52 |
1.72 |
|
Tirefond V23-255 |
23 |
255 |
23 |
21 |
115 |
31 |
16 |
12,5 |
52 |
2.04 |
|
Tirefond V26-115 |
26 |
115 |
23 |
21 |
10 |
31 |
19 |
15,5 |
52 |
0.92 |
| Brand | GNEE RAIL | |||
| Name | Concrete Sleeper Screw Spike | |||
| Type | Ss5.-150 | V20-135 | ||
| Ss8-140 | V23-115 | |||
| Ss8-150 | V23-135 | |||
| Ss8-160 | V23-155 | |||
| Ss23-160 | V23-215 | |||
| Ss25.-165 | V26-115 | |||
| Ss35.-161 | ||||
| Or the type by customers' drawings | ||||
| Grade | 4.6 | 5.6 | 8.8 | 10.9 |
| Material | Q235 | 35# | 45# | 40Cr |
| Mechanical properties | Tensile strength: ≥400Mpa | Tensile strength:≥500Mpa | Tensile strength:≥800Mpa | Tensile strength:≥1000Mpa |
| Yield strength:≥240Mpa | Yield strength:≥300Mpa | Yield strength:≥640Mpa | Yield strength:≥900Mpa | |
| Elongation:≥22% | Elongation:≥20% | Elongation:≥12% | Elongation:≥9% | |
| Cold bending: 90 degree without crack | Cold bending: 90 degree without crack | Cold bending: 90 degree without crack | Cold bending: 90 degree without crack | |
| Surface | plain (oiled), Oxide black, Zinc, HDG, wax, bitumen, Dacromet, Sherardizing | |||
| Standard refers | ISO898-1, UIC864-1, and NF F500-50 | |||
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These screws are typically made from high-strength steel, and can be supplied in various grades (e.g., Grade 4.6, 5.6, 8.8) and surface treatments (Plain Oiled, Hot Dip Galvanized, Zinc Plated) to meet corrosion resistance and mechanical strength requirements in different environments.
GNEE RAIL supplies variable thread sleeper screws with customization available for size, grade, and surface treatment. The company also provides a full range of railway fasteners, professional installation guidance, and after-sales service, ensuring safe and efficient operation of track systems in all railway environments.
Send your special customization requirements to GNEE.
