slotted countersunk machine screws bolts

Or an AN366 winged nut plate can be riveted to the structure to make the removal and installation job easier.

10 screw will take an AN365-1032A fiber lock nut, which is normally used. To remember, so I always refer to a catalog or my trusty Standard Aircraft You can use an AN90-10L steel washer or a No. Surface or to keep from scratching polished aluminum. Structure it is wise to use a washer under the head to protect a painted

Figure 1 (above) is a sketch of these screws. Do not substitute these screws in any structural application. These screws are commonly used for attaching a cowling, fairings, etc. It is not hardened by heat-treating because there is not enough carbon in the alloy. The AN526 is a nonstructural, truss-head screw made from low-carbon (1020) steel. After heat-treating, the screws are plated with cadmium for corrosion Screw, being made from 2330 nickel steel and then heat-treated, just like theīolts. All the older aircraft used slotted-head screws because the However, two of the most popular are the AN525 washer head and the AN526 screw.īoth are protruding-head screws and can be purchased as either slotted or There are several types of screws available for aircraft use This piece, which ran most recently in the “How To” section of the September/October 2019 issue of Vintage Airplane magazine, is part of an ongoing series of reprints of timeless tips from the late Robert G.

Slotted countersunk machine screws bolts