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WHEREVER FLUSH-HEAD SCREWS ARE USED
LOCKHEED adopts "Laminar Flow"

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National
HEADED AND THREADED
PRODUCTS

On exposed surfaces of fast planes, ordinary screws cause turbulence in air flow-and cut down speed. For the Lockheed Shooting Star, the trimmest and smoothest plane yet produced, "National" engineers developed true flush-head screws which have been adopted as standard by this great aircraft manufacturer.

The special method which we devised for producing Laminar Flow Screws and holding them to the extremely close tolerances required is typical of National Technical Service. Please consult us about this or any other fastener subject.

National Screw produces the most complete line of fasteners, both standard and special, made by any manufacturer for aircraft and other purposes. "National" specialties include the following:

Phillips Recessed Screws  
Laminar Flow Screws  
Marsden Lock Nuts  
Dynamic Lock Nuts  
Drake Lock Nuts
Place Bolts
Lok-Thred Studs
Rosan Locking System
Scrivets
Hi-Shear Rivets
Sems
Clutch Head Screws

THE NATIONAL SCREW & MFG. CO., CLEVELAND 4,0.

1946 NATIONAL AIR RACES        55