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Published Jul 04, 22
5 min read

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" [Specialists] just do not do it. [Upkeep managers] do not put it in the preventive maintenance schedule. And if you do not write it down, they do not enter and do it. "As soon as something gets loose, it begins wearing the flat interface between the fastener and the part. Once it begins, it just becomes worse.

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It's scary." U-bolts that secure axles to suspensions are typically discovered to be less than safe and secure. As a new truck is driven or hauled from the factory to a dealership or customer, the U-bolts are amongst the important things that "settle in" and the U-bolts unwind somewhat, Martens states. Dealer mechanics need to capture this but often do not something talked about throughout a Fleet Talk session at the current fall conference of the Technology & Maintenance Council of the American Trucking Associations.

" Do a visual inspection," Martens adds. Camo Fasteners. 2 indications of a fastener being loose are polishing around the fastener and brilliant orange weeping rust around the connection. "A mechanical suspension relocations rubber bushings, rockers, springs and it has a limited life," says Russ Brazeal, vice president of engineering at Hutchens Industries, where he's been for 43 years.

When they do, things break. [Maintenance workers] ought to re-torque the fasteners just out of routine. Visual motion follows the fact and you need to prevent that." Individuals don't tighten and re-torque the bolts like they should, Brazeal says. They're often tough to get to, a few of the torque loads are pretty high (350 to 540 foot-pounds and more), and it's a dirty task.

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Rubber wears and sometimes the car needs to be boosted to take weight off the suspension to see properly (3v Fasteners). A number of years ago Hutchens replaced standard bolts with huckbolts to protect the equalizer, or rocker, in between axles, and in this application they have actually held up well. "Among the most essential and typically disregarded maintenance products is examining and re-aligning your axles, says Jason Heath, product manager, Powered Automobile Systems, with SAF-Holland.

" In addition, axles effectively aligned enable a driver to concentrate on driving rather than fixing the steering wheel. This is an element that can impact safety along with worker satisfaction," Heath says. "Ill-handling lorries are a reason for a driver to rapidly start looking for employment at another business." U-bolts safe axles to suspensions and are therefore vital to function and security.

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And if changed, the correct parts should be used. Hendrickson states these specs are needed to acquire the right U-bolt: Type of bend (round, semi-round, square, and so on) Length of legs (from inside greatest point to end of thread) Thread size and pitch (great thread UNF, coarse thread UNC) Width (inside legs) Grade (typically SAE Grade 5 or 8) Rolled threads vs.

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Rolled threads likewise have a better surface quality, enabling applied torque to go straight to securing force. Always match the grade of the fasteners and U-bolts. If using a Grade 8 U-bolt, attach a Grade C locknut. Using a lower grade locknut will not tighten to a sufficient clamp force to maintain the correct clamp loads and can fail pwwrematurely.

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A moderate steel washer can compress when tightened and subject the bolt to vibration and tiredness, and permit the joint to loosen. If using flange fasteners, where a washer is not needed, remember they need a different torque value than a washer and locknut. Flange fasteners vs. locknuts and washers, along with fasteners with various finishings, have various torque worths.

Guarantee that an adjusted torque tool is used which a torque worth is specified. Know that specific automatic tightening up tools can lead to variations in torque worth and preload of bolts. Avoid this by utilizing an adjusted torque tool for the last tightening up torque. Keeping appropriate torque at all times is key for suspension performance, sturdiness and safety.

Under tightened U-bolts can trigger damage to breeding elements. To achieve a consistent U-bolt stress, the locknuts must be tightened up in a crisscross pattern in 50-pound increments. A good tightening up sequence makes sure that an even preload circulation is achieved in the joint.



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Howmet Attachment Systems provides a wide range of captive screws. These fasteners are important components in countless major airframe and electronics items. Whether defined for use in aerospace, electronic devices, transportation or commercial products, these trusted captive screws have served the industry for more than 50 years. Howmet Fastening Systems' captive screws are crafted for strength, dependability and performance.

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The appealing stainless or anodized aluminum surface makes them specifically appropriate for front panel applications. The knurled knob permits easy fingertip operation. These Turn-Loc fasteners are available in low- and high-profile assemblies. Low-profile captive screw assemblies are the response when parent product thickness is not adequate to countersink, however protrusion should be kept to a minimum.

Our crimp ring captive screw style permits a mechanically installed ring to completely attach the screw to the panel. The accessory is set up with a basic hand tool. Medium-profile captive screw assemblies are designed with a sleeve/standoff that allows finger gripping of the screw for simple engagement. These captive screws have torqueing functions for use with a basic motorist.

High-profile, all-stainless slave screw assemblies are spring-loaded to provide holdout following disengagement. The assembly is mesmerized to the panel by a nut retainer that is mated with internal threads in the sleeve, providing better resistance to shear loads. Jacking screws are a high-strength slave screw created for the dual purpose of panel retention combined with jacking action for panel elimination.

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Captive screws allow fast assembly and disassembly of panels in applications needing regular access. Continued reuse of threaded fasteners can trigger damage to the application after just a couple of cycles, resulting in high repair costs. Lost and dropped fasteners are no longer an issue in difficult to access locations. Once installed, captive screws are permanent yet still allow access inside the application.

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