TINNERMAN

These speed nuts are self-locking steel fasteners. Locking action is derived from force exerted by two arched prongs against the root of the screw thread and by the spring ten- sion of the prongs and base. The combined forces of the thread lock and spring tension provide a vibration proof fastening. Speed nuts retain their spring tension & may be used repeatedly without losing their self-locking effective- ness. Suitable for numerous non-structural applications. Finish: Phosphate-coated with three coats of olive drab paint. IMPORTANT: Speed nuts for aircraft are designed to fit standard AN530-AN531 type B sheet metal screws only. Do not use pointed type A sheet metal screws with aircraft Speed nuts. There is a difference in root diameter and thread pitch. Screw lengths: B type sheet metal screws have a blunt taper at the end. To be certain the fastener prongs grip on the full root diameter, the screw should protrude two to three threads beyond the prongs. See the illustration. FLAT TYPE (NAS 446) Used to replace threaded nuts, lock washers, and spanner washers; weigh less than other types of self-locking aircraft fasteners. Can be applied faster, easier, and are vibration resistant. Provide maximum holding power at minimum cost per fastener. Turned-up ends prevent scoring of surfaces. Use with type B tapping screws.     Screw Size Part No. Price Buy #4 A1776-4Z-1D $0.21 #6 A1777-6Z-1 $0.29 #8 A1778-8Z-1D $0.19 #10 A1779-10Z-1D $0.22 "U" TYPE (NAS 395) Snaps over edge of panels or into center hole locations. Holds itself in place for blind assembly. "Floats" free for easy hole alignment.  "U" Type Design Variations Part No. Type B Screw Size Design Variation P Panel Thickness Range A Length B Width C Max Center of Hole to Edge G Panel Hole Diameter T Material Thickness Price Buy A1784-6Z-1D #6 E .025-.051 0.610 0.440 0.281 0.250 0.025 $0.33 A1785-67-1D #6 E .025-.064 0.840 0.440 0.500 0.281 0.025 $0.36 A1789-8Z-1D #8 E .025-.051 0.610 0.440 0.281 0.250 0.028 $0.29 A1787-8Z-1D #8 E .025-.064 0.840 0.440 0.500 0.281 0.028 $0.31 A1788-8Z-1D #8 AE .025-.064 0.840 0.440 0.500 0.170 0.028 $0.24 A1348-8Z-1D #8 AE .025-.064 0.730 0.500 0.343 0.170 0.028 $0.40 A1932-8Z-1D #8 BE .032-.051 0.580 0.500 0.265 0.343 0.025 $0.40 A1786-8Z-1D #8 CEH .040-.051 0.530 0.500 0.218 0.250 0.028 $0.21 A1350-10Z-1D #10 AE .025-.064 0.730 0.500 0.343 0.218 0.031 A1787-10Z-1D #10 E .025-.064 0.840 0.440 0.500 0.281 0.031 $0.35 A1758-10Z-1D #10 E .081-.094 0.620 0.440 0.281 0.281 0.031 $0.23 HOW TO APPLY SPEED NUT FASTENERS FLAT TYPE "U" TYPE Fastener is positioned over screw clearance hole with screw-engaging prongs pointing up or outward. Screw is started into nut by hand from the underside. Push into position with thumb until extrusion on lower leg snaps into screw hole. The fastener "floats" in screw-receiving position to correct for normal misalignment in panel mounting holes. Screw can be power-driven into locked position (when base arch of fastener is flat) or a hand screw driver can be used. No wrench is required, finger pressure will prevent it from turning. Place second panel in position and drive screw. Access to opposite side is unnecessary. Flush mounting can be made by embossing either panel.