shouldn't these nuts... ?

[Nacho-RT74]

fit TIGHT and hard to thread in ?

http://cgi.ebay.com/ebaymotors/64-74-Mopar-340-383-440-Correct-Exhaust-Pipe-Bolt-Set-_W0QQcmdZViewItemQQhashZitem588ab57c10QQitemZ380284271632QQptZVintageQ5fCarQ5fTruckQ5fPartsQ5fAccessories

I got this nuts/bolts kit and I can thread in the nut easily up to the end with my hand

[resq302]

I would imagine they would be tight towards the end of the nut where the relief cuts are.  If not, I guess they were never "crushed" to hold them tight.

[A383Wing]

the originals had a tab that was bent around the nut when it was tight...so it won't work loose.....

I got them on my cream 66

[gtx6970]

They're not lock nuts, just a castelated nut.

[A383Wing]

correct.....not a lock nut....which is why mine has the bend over tab on one flat of the nut

[Nacho-RT74]

I don't get the tab thing

and whats the deal being castelated then ?

[Dans 68]

I don't get the tab thing

and whats the deal being castelated then ?

To quote: "A castellated nut, also called a castle nut or slotted nut, is a nut with slots (notches) cut into one end.[1] The name comes from the nut's resemblance to the crenellated parapet of a medieval castle.

The bolt or axle has one or two holes drilled through its threaded end. The nut is torqued properly and then, if the slot isn't aligned with the hole in the fastener, the nut is rotated to the nearest slot. The nut is then secured with a cotter pin or safety wire.[1]

Castellated nuts are used in low-torque applications, such as holding a wheel bearing in place."  http://en.wikipedia.org/wiki/Castellated_nut

"Una tuerca almenada, también llamada una tuerca de castillo o tuerca ranurada, es una tuerca con ranuras el corte (de muescas) en un final. [1] el nombre viene del parecido de la tuerca al parapeto almenado de un castillo medieval.

El cerrojo o el árbol tienen un o dos agujeros taladrados durante su final enhebrado. La tuerca es torqued correctamente y luego, si la ranura no es alineada con el agujero en el sujetador, la tuerca es hecha girar a la ranura más cercana. La tuerca es asegurada entonces con un alfiler de chaveta o alambre de seguridad. [1]

El loco almenado es usado en aplicaciones de torsión baja, como la posesión de una rueda que lleva en el lugar.

Dan

[Nacho-RT74]

I understant the castelated name cause the shape LOL ( thanks ), It's like the front end ones. but I want whats the deal with that shape on these if they are not making pressure something like a conic threat? gap is not enoug to fit a cotter pin AND BOLTS doesn't have any hole.

since gap is not enough, and bolt doesn't have a hole, I don't understand the tab deal.

I have castelated nuts on piston rods and they fit with some pressure againts the bolt, to lock them