1957 1958 taillight nut for the oval head Phillips screw.

[Dan P.]

The 1/4-20 nut that goes on the Oval head Phillips head screw that holds the was changed 10/11/ form 134551 to 440491.374551 is regular 1/4 -20 hex nut .Is 440491 a Pal nut . If so would thee be a lock washer.What was used in 1958.A/M manual section 12 sheet 4.00.

[David B.]

Re: 1957 1958 taillight nut for the oval head Phillips screw.

Part #4404491 is a 1/4 -20 stamped steel nut (what you refer to as a Pal nut). It's flange diameter is .594. Follow the AIM