Brand
Tomei
Compatibility
EVO 4 CN9A
EVO 5 6 CP9A
EVO 7 – 9 CT9A
Part Number
193022
FEATURE / SPEC
| MATERIAL | * Bolt SNCM439(WPC finish) * Nut SCM435 Tensile strength 220,000psi (155kgf/m㎡） |
|---|---|
| SIZE | M10 P1.25 |
●BOLT STRETCH LIMITS
Bolts and screws in general will stretch when placed under stressful conditions. The stock bolts will tend not to return perfectly to its original shape once stretched due to the manufacturing methods used for the original purpose of the bolt design. Tuned engines will go through many procedures which require the bolts to be reused during every step. When having a dummy head installed and getting a bore and hone, when checking for bearing clearances and so on. So when the bolts are removed and torque up repeatedly bolt stretch management will then become difficult to manage the and retain the strict clearances required. The TOMEI Stud bolts are the best choice for high performance precision engines which require the fixed elastic range of the bolt set for repeated use and to maintain performance. The TOMEI Bolts will keep your engine together when needed most.
●ROTATING SURFACE HEAT TREATMENT
Rotation processing is the method of Rotating Die and Work Hardening the raw core of the bolt is placed on the cradle between the two rotating die with pressure applied from both sides. The metallic crystals within the bolts are then deformed at a microscopic scale, and then interacted with one another to make up a strengthened bolt that carries increased yield strength. The chromoly steel of the Tomei strengthened bolt is first heat treated and rolled on the rotating die, increasing impact resistance, surface strength, and longevity. These standards add up for the highest quality product available.
●ANGLE TORQUE BOLT TIGHTENING METHOD
An engine cannot be properly built without the use of the angle torque method when tightening certain bolts. It is necessary to utilize a special angle gauge when tightening strengthened studs and connecting rod bolts. Applying torque to the bolts without this specialized tool can lead to immediate or eventual catastrophic failure of the engine assembly.
| Lack of bolting force | Excessive bolting force | |
|---|---|---|
| Head bolt | ・Leaking gas, water, oil caused by lack of the sealing pressure ・The further fall of bolting force, loosening, and engine breakage. |
・ Leaking gas, water, and oil from excessive bolting or failure of sealing pressure. ・Breakage of the cylinder from distortion. ・Poor piston clearance caused by cylinder distortion. |
| Crank bearing cap bolt Conrod bearing cap bolt |
・Worn out of the engine by bad bearing assembly. ・Noise by too much clearance of bearing. ・The further fall of bolting force, loosening, and engine breakage. |
・Worn out of the engine by bad bearing assembly. ・Worn out of the engine by poor clearance of the bearing. |
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