Every engine needs to make sure that the driveline is as robust as possible, and the Cosworth DFV is no different. That’s why we supply the DA0852 DFV flywheel bolt that is made by Cosworth’s original UK supplier, to Cosworth’s original specifications.
Each bolt is carefully inspected after machining, and every batch comes with complete quality certification that ensures that Cosworth’s dimensional, mechanical and metallurgical requirements are met. The supplier provides certificates showing mechanical test results on a heat treatment test bar as well as a finished bolt.
The bolts are made by cold forming (as signified by the “C” on the head), a process that work hardens the material to make it harder and stronger. The bolts are then heat treated to raise the hardness to around 41 HRC. Finally, the threads are then rolled, another cold forming process that results in a stronger bolt.
We also stock other flywheel bolts with different thread sizes and lengths – if you alternative sizes then please get in touch.
- S149 steel alloy
- Typical UTS = 1,382 MPa (200,000 psi)
- Thread size = 3/8″-24 UNF
- Underhead length = 19.304/19.812 mm
- Head height = 5.918/6.172 mm
- Hex size across flats = 14.084/14.288 mm