Head bolts stretching. $66. 2 days ago · To replace or t...
Head bolts stretching. $66. 2 days ago · To replace or to reuse depends entirely on how much the bolt has stretched. This stretching ensures precise clamping force but also makes them essentially single-use. The bolts are stretched into their elastic range, and in many cases, the stretching approaches the bolts' elastic limit, permanently stretching it. Therefore, the thicker the rail, the few bolts are necessary. Modern engines mostly use torque-to-yield (TTY) bolts, designed to stretch beyond their elastic limit when installed. Find many great new & used options and get the best deals for Stretch Head Bolt Set Apex Automobile Parts AHB499 at the best online prices at eBay! Free shipping for many products! Torque values for various grades and diameters of fasteners. Bolt spacing should be about 4x the bolt diameter Accuracy is maximized by overlapping strain cones. These are TTY bolts (torque-to-yield) also called stretch bolts. Learn when new bolts are mandatory, how to spot TTY, and what to do instead. 16 Free shipping Find many great new & used options and get the best deals for Stretch Head Bolt Set Fel-Pro ES72206 at the best online prices at eBay! Free shipping for many products! Part #: AHB333. As long as they are not stretched, corroded, or damaged, you can often reuse head bolts of this type. Think of them like a spring that bounces back. Torque sp Bolts are designed to stretch as you torque them into place, and when you remove them, they snap back to their original position. Stretch bolts are often used as head bolts and have a special design to actually stretch out as they are installed to torque specifications. Go inside the Fel-Pro Field Test Garage with Master Technician John Gurnig to learn how torque-to-yield (T-T-Y) head bolts are tested for stretch. Because of this, many standard head bolts are okay to use more than once, as long as they have not been stretched past their spring back point. rigid carrier gaskets. Free Shipping in Canada over $149 ~ No Customs, No Duties, No Hassle Fel-pro Es72137 Misc Set Up Diagram Stretch Head Bolt Set Fel-Pro ES72137 Fel-pro Es72137 Misc Set Up Manual Federal-Mogul engineers are continually pushing ahead with new sealing science- developing problem-solving products like PermaDryPlus?. 56 Free shipping Engine Cylinder Head Bolt Set Apex Automobile Parts AHB716 Find many great new & used options and get the best deals for Stretch Head Bolt Set Fel-Pro ES71177 at the best online prices at eBay! Free shipping for many products! These aren't your standard reusable bolts - stretch bolts are designed to be torqued to specific specifications and then replaced whenever you remove the cylinder head, which is crucial for maintaining proper clamping force and preventing serious engine damage. Can anyone point me to the max length specifications for the factory head bolts for the 12 valve? I didn't get a stretch gauge with my Mahle head gasket. 61 Free shipping Stretch Head Bolt Set Apex Automobile Parts AHB333 $71. While it does help them achieve uniform clamping, stretching a bolt past its elastic range permanently deforms it. Apex Engine Cylinder Head Bolt Set for SLX, Passport, Rodeo, Trooper AHB313 $92. 6 days ago · Head bolt stretch and reuse can make or break your rebuild. They often have a length of the shaft of the bolt before the threads that is made to stretch once torqued to the proper specification. Part #: AHB275. 72 Free shipping Sponsored Stretch Head Bolt Set Apex Automobile Parts AHB716 $45. Watch as John applies load to a head bolt to Once they reach this zone, they maintain a more precise and consistent level of clamping force across the entire head-to-block mating surface. These bolts typically use a torque specification only, like “tighten to 110 ft-lbs in three stages. Warranty Duration: Other. ” Used by many manufacturers, especially on engines with aluminum heads and in conjunction with Multi-Layer Steel (MLS) head gaskets, T-T-Y (Torque-To-Yield) head bolts are engineered to stretch within a controlled yield zone. We are a 3rd generation Auto Parts Dealer who has been serving the Rio Grande Valley for over 50 years. Torque-to-Yield (TTY) bolts: These are tightened beyond their elastic range into permanent stretch. Se habla espanol. Jul 7, 2025 · Traditional head bolts work like any other bolt – they stretch elastically when torqued and return to their original length when loosened. p4akb, fq7kc1, qwfm, or0j1b, xgen, wvjkm, cogj, xitymf, t2gj, jblc,