Do you torque ARP head studs?
Do I need to re-torque my head bolts or studs? If you follow the ARP installation instructions, there should be no need to do a re-torque. However, it may be necessary under certain circumstances if the gasket manufacturer’s instructions require it, particularly if a fire ring has been installed.
Are ARP bolts torque to yield?
No, ARP bolts are not torque to yield (TTY). TTY fasteners, when being torqued, actually stretch because of the elastic properties of the material. This gives them the needed clamping force, but the downside it that they aren’t reusable (well, at least they shouldn’t be reused).
How hard are ARP bolts?
Typical tensile strength is 260,000-280,000 psi. Titanium: ARP now offers special order fasteners made of an alloy (Ti6Al-4V) that is specially heat-treated (a process developed by ARP’s own Russ Sherman) and provides superior strength to other titanium alloys employed in racing and aerospace.
How much does a bolt stretch when torqued?
To appropriately answer this question, it helps to first consider that only approximately 10-15% of the input torque actually stretches the bolt; the remaining 85-90% of input torque is primarily used to overcome friction between the mating threads and friction under the bolt head or nut.
What is so special about ARP bolts?
The process starts with wire coils and ends with fasteners, nuts and bolts that are superior to what is widely considered aircraft quality. ARP’s fasteners are built to withstand serious racing and have higher tensile strengths and can survive higher stresses than most aircraft fasteners will ever see.
Will ARP black oxide bolts rust?
Black Oxide adds a layer of corrosion and abrasion resistance to fasteners. Like any material, black oxide treated fasteners can rust in the right environments.
Is it bad to reuse torque to yield bolts?
What is a torque-to-yield bolt? It is a one-time-use fastener that is designed to stretch during the torquing process (installation). Because of this stretching, the integrity of the bolt is compromised. These bolts cannot and should not be reused due to the stress caused to the bolt during its first installation.
Can I reuse torqued bolts?
Reusing nuts, bolts, washers, and other mechanical fasteners is generally never a good idea. If you have any doubts about a fastener’s condition, it is best to discard it in favor of new fasteners as that will always result in a stronger, more durable joint.
Can I reuse torque to yield bolts?
What happens if head bolts are not tight enough?
Uneven loading created by unevenly tightened head bolts can distort the head. Over a period of time, this may cause the head to take a permanent set. So any head that has not been properly torqued should be checked for flatness prior to installing a new head gasket.
Are ARP bolts made in USA?
We were invited to tour several of ARP’s facilities in Ventura and Santa Paula, California, where it manufactures every fastener. Each stud and bolt is forged, washed, hardened, washed again, tempered, and milled before the threads are rolled.
What grade is a black oxide bolt?
Grade 8
Amazon.com: Grade 8 – Black Oxide / Bolts / Fasteners: Industrial & Scientific.