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SKU: 193003
Regular price £412.01
Regular price Sale price £412.01
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In order to secure the performance required of head gaskets, such as cooling, rigidity, and sealing, it is necessary to strengthen combination of a cylinder head and a cylinder block. However, in combination with a common bolt and nut, no matter what strengthen bolt it may used, bolting power concentrates on from third mountains to the 1st mountain of the screw, and the total bolting power cannot be increased beyond a certain value. Moreover, excessive stress is concentrated and may damage the bolt. Stud bolt, on the other hand, is applied dynamic design to its threading so that the bolting force is dispersed to all the screw threads and mighty bolting power is generated.


RB26DETT 193003 ・Bolt×14
* Dummy head cylinder boring is highly recommended to get the best result for the stud bolt installation.


MATERIAL * Bolt SNCM439(WPC finish)
* Nut SCM435

Tensile strength 220,000psi (155kgf/m㎡)
Hardness HRC40~50
SIZE M12 P1.50

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.

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.

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.

Engine components that require precision accuracy when tightening its bolts cannot be trusted with basic torque figures. This is due to 80~90% of the friction is lost on the surface of the thread and the seat when tightened, with the correct figure being at 10~20% of the torque applied. The surface of the thread and the seat depends on the roughness of each surface and the lubrication state, so that no matter how accurate the torque specs are specified it cannot be trusted.

【Change of Axis force due to the difference of friction of the washer】 
Please use an Angle Guage as well when torquing up these TOMEI Reinforced Bolts.
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