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Titanium Bolts. Standard Pressed Steel Co. of Jenkintown, Pa. has started producing titanium bolts for air frames and airplane engines. Main advantages of the bolts over the conventional steel type: they are stronger and less subject to metal fatigue, save as much as 1,000 lbs. in a plane's weight. Price: about $100 a lb.

Self-Solder. For the amateur solderer the Hercules Chemical Co. of New York City put on the market Swif, a regular tin-lead solder in a plastic tube. The do-it-yourselfer squeezes on Swif as he would toothpaste, then seals the joint with heat from a match, cigarette lighter or electric iron. Price: 59 1/2 per 1 1/2-oz. tube.

Toy Sewing Machine. Singer Manufacturing Co. brought out a new miniature sewing machine for children that will do everything big machines do except make zigzag stitches. Called Sewhandy, the machine comes with a special guard to protect children's hands from the needle. Price: $12.95.

Automatic Toll-Taker. New Jersey's Garden State Parkway is using a robot toll-taker that collects fares directly from motorists, corrects improper payments, sounds an alarm if a motorist fails to ante up properly, and has a camera that snaps a picture of the rear license plate if a car tries to get by without paying the toll.

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