Calculation of the required torque for tightening the lock nut. Back off the adjusting nut one full turn or until it is loose. Lock nuts with integral locking reduce the cost of the shaft as no keyway is required. Tighten the initial nut convex or concave to the torque required for the target application. Castellated wrench, to tighten nuts with straight lots or castellated nuts. Skf lock nuts are easy to mount, do not damage the shaft and ensure effective locking. Torque a one piece spindle nut to 300 ftlbs while rotating the hub. T axle nut torque type size specifications less than 258 258 and over dowel type washer tang type washer less than 258 258 and over install cotter pin to lock axle nut in position. The two main categories of prevailing torque type nuts include. Bolt tightening by the turnofthe nut method duration. Chevrolet axle nut torque specifications ricks free auto. The dos and donts of wheel bearing torquing knowyourparts. There isnt really a general torque specification for a locking nut.
Normally, the convex tightening nut is the initial nut, but the concave nut may be used as the initial nut instead. Needless to say, tightening a wheel bearing has to be done carefully and precisely. The spanner engages the nut in four positions giving a secure grip. How nut torquing and backoff are used to set wheel bearings how do we adjust wheel bearings to meet the correct endplay specifications. An fag hook wrench is used to tighten shaft nuts, adapter sleeve nuts. Installation is quicker and easier because no separate locking device is necessary. Unitized wheel bearing nut system installation and removal procedures before installing axilok, check the following.
Tightening with a precision bearing nut precision lock nut provides a predetermined tightening force by controlling the bearing torque. Tighten adjusting nut to 50 ftlbs68 nm while turning hub. Take your wrench and place it over the wheel bearing nut. Download table calculation of the required torque for tightening the lock nut. Over tightening adjustable tapered roller bearings can lead to premature failure. Whats the torque setting and or procedure for tightening. Installation procedure and wheel bearing adjustment. Which type of automotive bearing can withstand radial and thrust loads, yet must be adjusted for proper clearance. Timken tricks of the trade finding wheel hub torque specs. There is a range for the torque to allow for the possibility that you might need to go a little bit further to get a tab to line up with a groove in the nut.
Understanding the nut factor in threadedfastener torque. The bearing catalog should include the torque recommendations for these nuts. Ss low carbon steel sc high carbon steel sus stainless steel prevailing torque nm proof load n max. The uni torque lock nut starts freely on a bolt or stud like a common nut until the deflected thread portion is reached. Skf spanner set tmhn 7 for lock nuts it is essential when mounting self. While you might be able to guess the right amount of torque, overtorquing the lock nut will put stress on the bearing and can cause it to fail prematurely. The torque values i included above were for a standard lock nut with a tab lock washer. We always recommend checking and following manufacturer specifications when tightening lock nuts, rather than following your intuition. For preset and lms hub assemblies, torque the protorq spindle nut to a minimum of 250 ftlb. Each spanner is clearly marked with the correct tightening angle. Bearing lock nut, also known as elastic stop nut, locknut, stiff nut and torque nut is an essential part of every machine on earth. However, the loosening torque of these lock nuts requires more attention. Follow this sixstep procedure for nut torquing and back off to adjust wheel bearings to meet correct end play specifications. In fact, uni torque lock nuts have a reusability of five times or more.
Torque the adjusting nut to 200 lbfft to seat the bearing components. If you do not tighten the initial nut, make sure that you use a wrench or some other tool to hold the initial nut in place when tightening the secondary nut. Exceeding this torque value for full contact of the nuts is acceptable. Additionally, they can be used to mount bearings with a tapered bore onto tapered shaft seats and adapter sleeves, and to dismount bearings. The tightening torque mt, for precision lock nuts or end plate bolts, must be sufficient to keep all components, including the bearings, in place without causing.
The fuji bearing locknut is a one piece item where the locking function is performed by a spring peened into the top of the nut. All metal prevailing torque type lock nuts achieve their prevailing torque by altering the shape of the nut in some way most commonly by distorting the threads of the nut which then bites into the mating part when tightened. Each locking clip should be securely fastened to the nut body and have a rivet that passes through the top of the locking clip body. From my expereince any torque beyond no play is not good for the bearing. Lock nuts locate bearings and other components on shafts and facilitate mounting and dismounting. Timken tricks of the trade finding wheel hub torque. Tighten the adjusting nut to a final torque of 50 ftlbs while rotating the wheel. Commercial and precision retaining devices for bearing, power transmission and other machinery and equipment assemblies, including mechanical lock, prevailing torque, locknuts with lockwashers, adapter sets, collars.
If the washer tang and nut flat are not aligned, remove washer, turn it over and reinstall. Key benefits proof load and maximum tightening torque socket tools for fuji bearing locknuts. Lubricate the tapered roller bearing with clean axle lubricant of the same type used in the axle sump or hub assembly. Global leadership in design and manufacture of industrial retaining devices.
For single nut self locking systems, consult manufacturers instructions. Nut torquing and backoff to set wheel bearings know. Undertorquing the lock nut will allow play in the axel and bearing, which would also cause premature failure or possibly catastrophic breakage. For onepiece spindle nut systems, torque the nut to a minimum of 300 ftlbs. If the force required is above the desired reading of 5 lbs. Tighten the secondary nut to the minimum torque value set by hardlock. I do remember that you tighten the inner nut and then back it off a bit but cant remember how much. The primary purpose of locking nuts and bolts is to provide resistance against vibration while the machine is operating. Tighten the wheel bearing adjusting nut to 2334 nm 1725 lbft while rotating the disc brake rotor in the opposite direction. Schaeffler technologies ba 28 11 selfaligning ball bearings tools, values designation nut of adapter sleeve locknutdoublehook tightening torque. Lock the precision nut on the shaft against loosening.
In use the spring bears on the flank of the shaft thread with force p generating reaction force p in the screw threads with a resulting high friction torque prevailing torque. Never use an impact wrench when tightening or loosening lug nuts or bolts during the procedure. Thread the nut onto the axle until hand tight against the bearing. Always check the service information for the correct procedure. There can be large differences depending on bearing type and housing. Tapered roller bearing adjustment procedure rp 618a. Understanding the nut factor in threadedfastener torque tension relationship. They ensure long bearing service life and reliable locking and can prevent bearing fitting damages. Prevailing torque a design feature of the lock nut produces friction between threads of mated components thereby increasing the force needed to tighten as well as loosen the nut. Tightening torque for bearing lock nuts misumi blog. Steer single nut steer double nut drive trailer steer. Manual adjust conventional hub wheel bearing adjustment procedures reference tmc rp618 axle type axle spindle threads per inch spindle nut type final spindle nut backoff jam nut torque ftlbs steer front nondriven 12 single nut with cotter pin 16 turn install cotter pin to lock spindle nut into position 18 14 turn from step 6 12 double. Tight to 50 pounds to snug up, back off and re tighten to 35 pounds to more or less reset and then back off a 14 turn and align the key slot on the threaded axle housing with the nearest key slot on the nut. However, if a permanent roadside repair is needed, tighten the nut against the greasepacked wheel bearings as tight as you can with a channel lock type of pliers.
The danger with set screw locking bearings by victor wowk, p. How far to back off the bearing retaining nut on rear axle. Lock nuts are used to locate bearings onto a shaft. Torque the wheel bearing retainer nut to 50 ftlb while rotating the wheel assembly. The identification tag is retained between the tangtype lock washer and the inner nut. Thread the wheel bearing nut on until it is hand tight. Axle wheel bearing installation specifications conventional wheelend system axle initial adjusting nut torque a final adjusting nut torque c spindle thread diameter jam nut torque specification acceptable end play range c drive axles without lock washers 200 lbft 272 n m back off 1 turn 50 lbft 68 n m back off 14 turn less than 258. While oscillating the wheel, torque the adjusting nut to 200 lbfft to fully seat the bearing components. Stemco assumes no responsibility for bearing warranty.
The lock nut is tightened to the predetermined torque t. How much torque should we put on the locking nut during. Carmodel torque in nm steel rim alloy rim alfa romeo mito, giulietta 90 120 147, 156, 166, spider gtv r 2006 100 100 159, brera spider 120 120 gt 84 100 audi all current types except 120 120 rs 2. Install the outer wheel nut on the spindle and tighten. Not the preload torque but the torque to hold the cone inner ring to a spacer or shaft shoulder. While you might be able to guess the right amount of torque, overtorquing the lock nut will put stress on the bearing and can cause it. If endplay is correct, check the starting torque by attaching a spring balance to the hub lug bolts and pulling at a 90 degree angle while noting the required force to turn the hub. By the way, i am reading fords service instructions for the 96 bronco wheel bearing retainer service. Back off the adjusting nut to remove the preload and then tighten it to 7 ft.
Back the nut off 14 turn and re tighten and torque to 20 inlb note the inlb and not ftlb. Can anyone share a source where i can get torque values of locknuts used on tapered roller bearings. Inch accessories locknut and lockwasher on the timken. If the locking device cannot be engaged, advance the spindle nut until the lock can be engaged.
Always rotate or oscillate the wheel while torquing the adjusting nut to ensure that the rollers are fully seated against the cone large rib. It is an assembly of a cast iron, or steel, pillow block that is bolted to support structures. The hardlock bearing nut is manufactured with a thread tolerance class of 6h. Engage any locking device that is a part of the spindle nut system. There is a rule of thumb on tightening wheel bearing lock nuts that i cant seem to remember. For information on loosening torque, refer to the product data sections for the various lock nut series. This is how to adjust the wheel bearing nut, ratcheting design, on a 1985 ford f150. Skf lock nut spanner makes an impossible job simple seven different spanners for fitting km lock nuts size 5 to 11.
How nut torquing and backoff are used to set wheel bearings. Idiots guide to tightening the front wheel bearings land. The nut is tightened and then secured with the lock washer. Browse inch accessories locknut and lockwasher in the the timken company catalog including part number, bearing bore,major diameter,threads no. The only thing i am unsure about is how tight to wind up the hub nut against the bearing.
We use nuts that are in inch sizes and we torque them based on the table from the skf catalog. These shafts are supported with tapered bearings that are locked with a nut. Tighten the nut until it is firm and cannot be tightened anymore. Tightening lock nuts on wheel bearings rovers north. The manual gives the torque for the locking nut only. This is a common arrangement on hvac heating, ventilating and air conditioning equipment and general industrial machines. Locking pin engaged torque wrench display of tightening torque bearing inner ring shaft adapter sleeve figure 5 tool and parts to be mounted 0001a30001a3aaff. Bearing lock nut lock nut types locking nuts and bolts. If you have a system that differs from what is indicated in this procedure, consult the.
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