SKF lock nuts – the components for quick location

1 SKF lock nuts the components for quick location2 ContentsMade by SKF stands for excellence. It symbolises our consistent endeavour to achieve total quality in everything we do. For those who use our products, Made by SKF implies three main thanks to modern, efficient products, based on our worldwide application know-how, optim-ised materials, forward-looking designs and the most advanced production effectiveness resulting from the favourable ratio between our product quality plus service facilities,and the purchase price of the lead which you can achieve by taking advantage of our products and services. Increased operating time and reduced down-time, as well as improved output and product quality are the key to a successful , easy and efficient mounting.

2 3 Five types to choose from .. 3 Adjustable to minimise runout .. 4 Loosening torque .. 5 Permissible axial load .. 5 SKF spanner set TMHN 7 for lock nuts .. 5 Keeping a firm grip on trouble-free operation .. 61 KMT lock nuts for high precision .. 7 General information .. 7 Product table .. 82 KMTA lock nuts for compact design .. 10 General information .. 10 Product table .. 113 KMK lock nuts for simple 12 General information .. 12 Product table .. 134 KMF lock nuts with new locking 14 General information .. 14 Product table .. 155KM(L) lock nuts with locking washers .. 16 General information .. 16 Product tables .. 17 The SKF Group a worldwide organisation .. 203 Lock nuts locate bearings and other componentson shafts and facilitate mounting and dismount-ing.

3 SKF supplies a wide range of lock ensure long bearing service life and reliablelocking and can prevent bearing fitting lock nuts are easy to mount, do not damagethe shaft and ensure effective types to choosefromOf course it would be possible to pro-duce just one lock nut for all require-ments, but this would be nothing but acompromise: too expensive for a greatnumber of applications, for manyothers technically not the SKF product rangecomprises five types, each having itsadvantages in function and applica-tion. SKF lock nuts cover a large rangeof both metric and inch , easy and efficient mounting4 Fast, easy and efficient mountingSimple tools can be used similar tothose for KM(L) and KMK nuts. KMFnuts are also (L) lock nutsThe SKF lock nutKM(L) when usedin conjunction withan MB(L) lockingwasher is a sim-ple, stable and reliable fastening lock nutsSKF KMT locknuts are high pre-cision compo-nents.

4 The nut islocked by meansof three radial brass locking pinsarranged at the same angle as thethread flanks. This removes the needfor a locking washer and keyway. Thenut can be accurately located at rightangles to the shaft by means of theradial locking pins and can be lock nutsSKF lock nuts ofKMTA design aremanufactured tothe same highprecision as KMTlock nuts. The locking principleand theability to be located at right angles tothe shaft are the same as for lock nuts are of a compactdesign and are intended for applica-tions where space is limited. They canbe lock nutsSKF lock nuts ofKMK design lockquickly and safelywithout the needfor a lockingwasher and keyway. The KMK nut islocked in position with a steel insert,an integral part of the nut thread,which presses against the shaftthread.

5 The nut remains perpendicularto the shaft when the insert is pressedagainst the shaft thread. KMK nuts arealso re-usableKMF lock nutsSKF has devel-oped a new rangeof lock nuts withinternal lockingsystem to supple-ment its existing nuts. The specialdesign feature of the KMF lock nuts isthe locking principle. A small part ofthe nut thread is pressed into the shaftthread by a locking screw and pre-vents the nut from and dismounting are easyand the positive locking effect is se-cure. Keyways in the shaft and addi-tional locking washers are not further information please referto the SKF General Catalogue, the SKF catalogue 3766 Bearingaccessories and the SKF Inter-active Engineering Catalogue .1 FigAdjustable to minimiserunoutBoth KMT and KMTA lock nuts havethe same unique design using threeequally spaced locking pins aligned atthe same angle to the shaft axis as thethread flanks ( fig).

6 This designmakes it very easy to align the locknut at right angles to the shaft locking pins can be individuallyadjusted to minimise radial and lock nut spanner makes an impossible job simple Seven different spanners for fitting KM lock nuts size 5 to 11. Each spanner is clearly marked with the correct tightening angle. The spanner engages the nut in four positions giving a secure spanner setTMHN 7 for lock nutsIt is essential when mounting selfaligning bearings on adapter sleevesto obtain the correct radial to do so will result in a shorten-ed bearing life and a sub-optimal per-formance. A set of seven spannershas been specially designed for thispurpose ( Table).Each spanner is clearly marked withthe correct tightening angle, ensuringthat the optimum drive-up the adaptersleeve is obtained.

7 The correct radialclearance will then remain after lock-ing the sleeve torqueDiagramillustrates the lockingcapability of the nuts described in thisbrochure. The KM(L) lock nuts havebeen used together with MB(L) lock nuts were tested ona threaded shaft and screwedtightlyagainst a shoulder. No axial load wasapplied. The grub screws of the KMT,KMTA, KMK and KMF lock nuts aretightened with the torques stated inthe product torque, NmThread diameter, mmPermissible axial load, kNThread diameter, mmKMT and KMTAKMKKMF and KM(L)SpannerNutBearing designationsdesig-desig-nationnationHNM 5KM 51205 EK2205 EK1305 EK HNM 6KM 61206 EK2206 EK1306 EK2306 EKHNM 7KM 71207 EK2207 EK1307 EK2307 EKHNM 8KM 81208 EK2208 EK1308 EK2308 EKHNM 9KM 91209 EK2209 EK1309 EK2309 EKHNM 10KM 101210 EK2210 EK1310 EK2310 EKHNM 11KM 111211 EK2211 EK1311 EK2311 EK2 Diagram1 Table1 DiagramKMT and KMTAKMKKMF and KM(L)Permissible axial loadKMT and KMTA lock nuts withstandhigher axial loads than most other locknuts because the entire threadedlength of the nut can absorb the load( Diagram).

8 2 Keeping a firm grip on trouble-free operationTrouble-free operation of bearings andother components depends not onlyon the components in question butalso on the adjacent parts. Correctmounting and regular maintenance areno less important in order to preventunplanned machine downtime. Manyoperators know this correlation andtake appropriate , SKF lock nuts are used inmany different production areas. Theycontribute to high quality, high reliabil-ity and the high precision of the size 15 (M 75 2) two spanner choice of spanner type dependsupon the application. The locking grubscrews can be tightened using astandard hexagon key or torquewrench. A torque wrench is recom-mended if an accurate looseningtorque limit is high axial loadsThe KMT design features a very longthread which accomodates high very effective lockingThe locking screws have a relativelylarge diameter so the thread lockingforce is high with even a moderatetightening.

9 The locking forces areapplied in the best possible waybecause the brass locking pins do not experience any axial brass locking pins do not deformwhen pressed against the shaft threadby the locking screws. The lockingeffect is provided entirely by frictionalforces. KMT lock nuts can be usedtime and time again without any lossof precision because the locking ele-ments are not deformed in to mount and dismountKMT lock nuts are simple to fit anddismount. All nuts incorporate hookspanner notches and additionally upKMT lock nuts for high precision Material: High-strength steelFinish: Phosphated and saturatedwith oilLocking pin: Hard drawn brassGrub screw: Type MT6SS short pin(DIN 915, 45H)Thread tolerance: 5H (ISO 965/3-1980)Recommended tolerance for shaftthreads: 6g (ISO 965/3-1980)A high-precision lock nut The thread and clamping face aremachined in the same set-up.

10 Themaximum runout between locatingface and thread is 0,005 without a locking washer and keywayKMT lock nuts are locked by threeradial brass pins which are arranged atthe same angle as the thread locking faces of the pins and thenut thread are machined in a keyways are not needed. Ex-pensive machining is therefore avoid-ed and shafts can be of a to align perpendicular to the shaftKMT lock nuts can be very accuratelyaligned at right angles to the shaft. Thethree locking screws enable the nuts tocompensate for inaccuracies in adja-cent components . The use of a KMTlock nut will therefore minimise radialand axial runout in most lock nutsM10 0,75 M 200 3 DimensionsAxialLoos-Grub screwsMassDesignationsloadeningSizeTight -LockAppropriatecarryingtorqueeningnutho okGd1d2d3d4Bb h Mcapacitytorquespanner1)