Split Lock

Is OK to use a lock washer togheter a flat washer in a joint?

I do not think that is OK, but my coworkers do. Can somebody give a link to a convincing website or give a convincing answer. My believe is that when you do that the bottom side of the lock washer is going to slide over the flat washer and the bolt will get loose

Most installations that use lock washers require that a flat washer be used under the lock washer. If you are working with soft material such as wood,plastic or aluminum the lock washer would just in-bed in the material without a flat washer.If you are torquing bolts in a metal to metal application the lock washer is usually not used.
How about lock washers? This is an interesting area. I always thought a lock washer was an important component in insuring that the nut and bolt stay in place. Not true! We keep coming back to the fact that a properly tightened nut and bolt will do much more than any lock washer can ever do. This is because a torqued bolt will stretch slightly and will try to return to its original position. While this is happening the male threads are firmly secured against the female threads of the nut holding it in place. This is why the correct torque setting will maximize holding power. A randomly tightened nut will not reach this holding power. So where does the lock washer fit in? Not very significantly! The standard split lock washer is about the least effective. If it makes you feel better to put it on go ahead but better use a nylon stop nut to hold the bolt in place. Think of how little effort it takes to un-tighten most nuts with a split lock washer. Neither the spring washer nor the wave washer do anything either. The star washer has some holding power on softer metals and plastic but that is about all. The protruding edges can dig in a little and help (but use a nylon stop not to be sure). This might help on the body and fender components. Then there is the tab washer. On an MGA they are used on the rear lugs to hold the drum brakes in place before wire wheels are installed. Tab washers are not very well rated due to the fatigue that takes place when bending the tabs over the nut. NEVER USE A TAB WASHWER A SECOND TIME.

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CLIMAX METAL 2C 250 S LOCKING COLLAR 2 BORE STAINLESS STEEL 2 PIECE SPLIT A455
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BROWNING R2 2 7 8 SPLIT TAPER LOCK BUSHING NEW IN FACTORY BOX FAST SHIP B104
BROWNING R2 2 7 8 SPLIT TAPER LOCK BUSHING NEW IN FACTORY BOX FAST SHIP B104
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BROWNING R1 2 5 8 SPLIT TAPER LOCK BUSHING NEW IN FACTORY BOX FAST SHIP B104
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BROWNING R1 3 1 8 SPLIT TAPER LOCK BUSHING NEW IN FACTORY BOX FAST SHIP B104
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TAPER LOCK SPLIT BUSHING 2517 2 1 8 WITH KEYWAY G157
TAPER LOCK SPLIT BUSHING 2517 2 1 8 WITH KEYWAY G157
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QTY 50 SPLIT RING LOCK WASHERS 5 8 STEEL MILITARY GRADE 5310 00 011 6123
QTY 50 SPLIT RING LOCK WASHERS 5 8 STEEL MILITARY GRADE 5310 00 011 6123
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TB WOODS SDS134 SPLIT TAPER LOCK BUSHING 1 3 4 BORE
TB WOODS SDS134 SPLIT TAPER LOCK BUSHING 1 3 4 BORE
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NEW IN BOX Martin 1008 5 8 Split Taper Lock Bushing Fast Shipping A482
NEW IN BOX Martin 1008 5 8 Split Taper Lock Bushing Fast Shipping A482
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TB WOODS SDS 1 7 16 BUSHING SPLIT TAPER LOCK USED
TB WOODS SDS 1 7 16 BUSHING SPLIT TAPER LOCK USED
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NEW IN BOX IDC SELECT H 13 8 1 3 8 SPLIT TAPER LOCK BUSHING FAST SHIP A170
NEW IN BOX IDC SELECT H 13 8 1 3 8 SPLIT TAPER LOCK BUSHING FAST SHIP A170
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NEW IN BOX IDC SELECT H 13 16 1 3 16 SPLIT TAPER LOCK BUSHING FAST SHIP A170
NEW IN BOX IDC SELECT H 13 16 1 3 16 SPLIT TAPER LOCK BUSHING FAST SHIP A170
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Qty 100 NOS 3 4 Split Lock Washer 75 MS51415 11 FF W 84 5310013860475 Zinc
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Tarot 450DFC Split Locking Rotor Head Assembly TL48025 1
Tarot 450DFC Split Locking Rotor Head Assembly TL48025 1
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Tarot 450 DFC Split Locking Rotor Head Assembly TL48025 03
Tarot 450 DFC Split Locking Rotor Head Assembly TL48025 03
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3141 Lock Washers 1 4 Medium Split Zinc coated Lot of 25 Pc
3141 Lock Washers 1 4 Medium Split Zinc coated Lot of 25 Pc
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Dayton Split Lock Washer for 5RWH4 5RWH5 for PPTLS5008G PPTLS5008G
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SPLIT RING LOCK WASHER 56 ID x 95 OD x 14 THICK LOT OF 500
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Holo Krome 15960 Split Lock Tite Collar 1 NEW
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NEW CLIMAX METAL STEEL SPLIT LOCKING COLLAR 20 MM ID 40 MM OD 15 MM WIDTH
NEW CLIMAX METAL STEEL SPLIT LOCKING COLLAR 20 MM ID 40 MM OD 15 MM WIDTH
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MARTIN SPLIT TAPER LOCK BUSHING 4040 BORE SIZE 2 15 16 NEWOTHER
MARTIN SPLIT TAPER LOCK BUSHING 4040 BORE SIZE 2 15 16 NEWOTHER
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2PK 5 16 Split Lock Washer pkg 25 QUA4 7115
2PK 5 16 Split Lock Washer pkg 25 QUA4 7115
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2PK 1 4 Split Lock Washer pkg 25 QUA4 7114
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10 PCS M3 E Type Retaining Ring Motor Jump Ring Split Locking Washer Buckles
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INDUSTRIAL MRO DML100N0000Z SPLIT LOCK WASHER NEW NO BOX
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LOT OF 100 FASTENEL 0520 00199 6 SPLIT LOCK WASHER SILVER PLATED NEW
LOT OF 100 FASTENEL 0520 00199 6 SPLIT LOCK WASHER SILVER PLATED NEW
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LOT OF 50 8 FASTENEL SPLIT LOCK WASHER 12213 0239 SILVER PLATED 0520 00200
LOT OF 50 8 FASTENEL SPLIT LOCK WASHER 12213 0239 SILVER PLATED 0520 00200
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LOT OF 1000 1 4 SPLIT LOCK WASHER SILVER PLATED FASTENEL NEW
LOT OF 1000 1 4 SPLIT LOCK WASHER SILVER PLATED FASTENEL NEW
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SPLIT LOCK NUT 241 03 BRAND NEW IN FACTORY SEALED PACKAGING FAST SHIPPING G91
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