. Automotive industries . uffler shall conform to thefollowing inch sizes: 1, 1,. l:i,, 2, 2,, 2V2,23/4, :!, :. ,. 3y2 and recommendation was formulated in order to re-duce the large number of exhaust pipe diameters usedin present practice and make it unnecessary for the muffler and exhaust heater manufacturers to provide foran unnecessarily large number of sizes. Such a stand-ard will be appreciated by the tubing mills and will fa-cilitate deliveries and stocking. The recommendation isintended to apply to future production and is based on asurvey of present practice which indicated
. Automotive industries . uffler shall conform to thefollowing inch sizes: 1, 1,. l:i,, 2, 2,, 2V2,23/4, :!, :. ,. 3y2 and recommendation was formulated in order to re-duce the large number of exhaust pipe diameters usedin present practice and make it unnecessary for the muffler and exhaust heater manufacturers to provide foran unnecessarily large number of sizes. Such a stand-ard will be appreciated by the tubing mills and will fa-cilitate deliveries and stocking. The recommendation isintended to apply to future production and is based on asurvey of present practice which indicated that the 1%,! 1. 2. 2!4, 2^, 2s and 3-in. pipe sizes were most gen-erally used. The majority of steering gear connecting rods usedare made with separate ball studs as this permits moresatisfactory heat treatment. These studs are now madeto many designs, differing but slightly in detail, but aremuch more expensive than standardized studs would following table of proposed standard dimensions istherefore recommended:. No. A B C D E F G a J K 1 1 IVs A H 16 13 3 H %-18 ll/s lJ/2 Vi 1 fJ 16 3/s 11 < y8-i8 3 iy* 1ft 1^ iy* 1 I, 3, ■^ 5A-l& 4 1^8 % m IH ^ 3s W M-16 6 ih ■*y» <A hB IH 1 4<s ft Vs-U Proposed standard dimensions for ball studs. It is recommended that the present S. A. E. standardfor square shaft fittings be revised so that the shaftend and nut dimensions conform to the shaft end andnut dimensions of the present S. A. E. standard fortaper fittings with plain and slotted nuts. Universal Joint Hubs In order to obtain better interchangeability betweenuniversal joints and transmissions, the Parts and Fit-tings Division recommends the adoption as S. A. Practice of the universal joint hub dimen-sions given in the accompanying table. The dimensionsspecified are of importance to the transmission manu-facturers by eliminating many present variations inthese parts, and to the transmission purchasers by mak-ing a
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