DOSSIER · UNCLASSIFIED · OPERATIONS
SECTION 10 // ARMOR / VEHICLE PROFILEREF · OBJECT-257
Object 257
IX

Object 257

USSRUSSR·Heavy TankHeavy Tank·HT break

A project of the heavy tank designated IS-7 that was developed in 1945. The vehicle was supposed to feature an electromechanical transmission. Development was discontinued at the documentation design stage. Existed only in blueprints.

Configuration
Health
2,000
DPM
2,031
View range
390m
Speed
50km/h
Camo
18Terrible
Mark of Excellence requirementsCombined dmg + assist · NA · 2026-08-27
3 marks of excellence
3 marks · 95%
2,918
2 marks of excellence
2 marks · 85%
2,318
1 mark of excellence
1 mark · 65%
1,615
A-01 · ARMOR SCHEMA

Armor thicknessMeasured

Nominal plate thickness straight from the game client. Click any plate to highlight it on the 3D model and focus the camera on it.

Armor
20mm
350mm

Hull

All 7 plates

Turret 2 of 2

All 14 plates
A-02 · SPECIFICATIONS

Specifications

Builds
Grade
Experimental
CrewShared perks
Field mods
Lv 0/7
Weaponry
DPM
2,031
Damage
440
Penetration
248 mm
… at 500m
222 mm
Reload time
13.00 s
Rate of fire
4.62/min
Aim time
2.90 s
Dispersion
0.400 m
… moving
0.180
… tank traverse
0.180
… turret traverse
0.100
… after firing
3.5
Damage vs. modules
165
Caliber
122.0 mm
Shell velocity
1,259 m/s
Max range
720 m
Ammo capacity
40
Potential damage
17,600
Shell cost
1,180 cr
Mobility
Top speed
50 km/h
Reverse speed
15 km/h
Power/weight
15.45 hp/t
Tank traverse
40.0 °/s
Turret traverse
26.0 °/s
Effective top speed
… hard
47.6 km/h
… medium
36.4 km/h
… soft
24.7 km/h
Effective traverse
… hard
40.0 °/s
… medium
30.6 °/s
… soft
20.8 °/s
Gun elevation
15 °
Gun depression
5 °
Gun traverse range
360°
Terrain resistance
… hard
1.30
… medium
1.70
… soft
2.50
Everything Else
Hull armor
130 / 130 / 70
Turret armor
350 / 240 / 100
Health
2,000
Engine health
360
… repaired
180
Track health
240
… repaired
180
… repair time
6.86 s
Ammo rack health
210
… repaired
140
Fuel tank health
200
… repaired
80
Total weight
55,000 kg
Stationary camo
5.55 / 0.92%
Moving camo
2.80 / 0.47%
View range
390 m
Fire chance
12%
Tank cost
3,560,000 cr
Gun Constraints

360° traverse

Crew
  • CommanderRadio Operator
  • Gunner
  • Driver
  • Loader
A-03 · MODULE RESEARCH

Module research

Guns
VIII
Stock
122 mm BL-9 (257)
IX
56,000
122 mm BL-13-1 (257)
Turrets
VIII
Stock
IS-3 (257)
IX
24,800
Object 257
Radios
X
Stock
R-113
Engines
VIII
Stock
V-2-54 (257)
IX
48,000
2x V-16 (257)
Tracks
VIII
Stock
Object 257
IX
24,000
Object 257 Version 2
A-04 · SERVER PERFORMANCE

Server performance

Aggregate stats from NA players over the last 30d

Avg WN8
1073
Above Average
Avg WNX
1058
aboveAverage
Win rate
47.0%
Bad
DPG
1270
Frags
0.58
Spots
0.95
Survival
25.5%
Dmg taken
1862
Hit rate
74.1%
Spot assist
314
Track assist
42
Defense
0.17
Avg XP
714

Aggregated from 1,509 tracked NA players · 12,649 battles. Coverage grows as more players are tracked.

MoE thresholds (combined dmg + assist)
65%1,615
85%2,318
95%2,918

Reach these combined damage (dealt + assist) values over a rolling window to earn marks of excellence.

Performance over time

Daily NA 30-day aggregates — how this tank trends as patches and meta shift

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Population spread

How NA players actually perform in this tank (30-day window)

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A-05 · TOP OPERATORS

Top players

Highest performers in the Object 257 on NA

  1. #1TriiggErZzdowN117 battles3,142
  2. #2Masta_kam107 battles3,116
  3. #3Meksmun128 battles3,099
  4. #4bean_pegasus130 battles3,034
  5. #5stijn1942138 battles3,029
  6. #6Idlez105 battles2,990
  7. #7Juliette102 battles2,980
  8. #8Wrt_Sk111 battles2,964
  9. #9TitiuBlack138 battles2,924
  10. #10German_intelligence104 battles2,914
A-06 · VIDEO INTEL

Video reviews

Curated reviews, replays, and guides from veteran players

A-07 · SIMILAR HULLS

Similar tanks

Closest matches by stat profile — pick the ones that fit your playstyle.

A-08 · CHANGELOG

Balance changelog

What changed for this tank between game versions

  1. 2.0Sep 1, 2025
    • EngineV-2-54ISV-2-54 (257)
    • Power700750
    • Engine2x V-16 (1000)2x V-16 (257)
    • Vehicle durability18001900
    • Vehicle durability19002000
    • GunIS-3 (257) / 122 mm BL-9IS-3 (257) / 122 mm BL-9 (257)
    • Reload time13.311.1
    • Dispersion at 100 m0.40.38
    • GunIS-3 (257) / 122 mm BL-13-1 AIS-3 (257) / 122 mm BL-13-1 (257)
    • Reload time13.513
    • GunObject 257 / 122 mm BL-9Object 257 / 122 mm BL-9 (257)
    • Reload time1311.1
    • GunObject 257 / 122 mm BL-13-1 AObject 257 / 122 mm BL-13-1 (257)
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