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Aviation History
1918
1918 - 0431.PDF
APRIL 18, igi8. INTERNATIONAL AIRCRAFT STANDARDS. (Continued from page 399.) . •.. 4P4—Specification for Plain, Bail, and Castle Hexagon Nuts for Aircraft. TABLE I.—DIMENSIONS AND TOLERANCES FOR PLAIN NUTS. A.Bolt size, in. O -112 O-I38 CI64 o-igo 0-216 0-250 0-313 0-375 0-438 0-500 0-563 0-625o-688 0-750 0-875 I -OOO TABLE 2.—'. A,Bolt size. ill. 0-164-32 0-190-32 0-216-32 0-250-28 0-313-24 O-375-24 o-438—20 o -500—20 mm. 4-17-32 4-83-325-49-32 6-35-287-94-24 9*53-24 H-II-2O 12-70-20 B, width N.across flats. Thickness. in. 0-250 0-313 O-375 0-375 0-438 0-438 o -500 0-563 0-688 0 -750 0-875 0-938 1 -ooo 1-063 1-250 1-438 •DIMENSIONS AND -Ball hexagon .-B, width across flats. N. A.Bolt size. in.0-094 0-109 0-125 0-141 0-156 0-188 0-234 0-281 0-328 0-3750-422 0-4690-516 0-5630-656 0-750 mm.2-85 3-514"I7 4-835*49 6-357-94 9-53II-II I2-7O 14-2915-88 17.46 19-05 22-23 25-40 B, widthacross flats. mm. 6-35 7-94 9-53 9-53 II-II II-II 12-70 14-29 17-46 19-05 22 -23 23-81 25-40 26-99 31-75 36-51 N, Thickness,mm. •38.78 3.183-57 3-974-76 5-957-14 8-339-53 10-72 11-91 13-10 14-29 16-67 19-05 TOLERANCES FOR BALL NUTS. -Ball castli in.O-375 0-3750-438 0-438 0-500 0-563 O-688 0-750 in. 0-172 0-172 0-172 0-203 0-250 0-313 O-359o-375 R. in.0-375 0-375O-375 0-3750-375 0-500 0-500 0-500 TABLE 3 A,Bolt size. in. 0-164-32 0-190-32 0-216-32 o -250—28 0-313-24o -375-24 0-438-20 0-500-20 . mm.• 4-17-3= . 4-83-32 mm. mm. mm. 9-53 4-37 9-53 9-53 4-37 9*53 II-II 4-37 9-53 II-II 5-16 g-53 12-70 6-35 9-53 14-29 7-94 12-70 17-46 9-13 12-70 I9-O5 9-53 12-70 .—DIMENSIONS AND HEXAGONB, width across flats. N.in. in. o-375 0-234 0-375 0-250 0-438 0-438 0-500 0-563 B. in.O-375 O-3750-438 0-438 0-500 0-563 O-688 0-750 mm. 9-53 9-53 II-II II-II 12-70 14-29 17-46 19-05 N'.in. 0-250 0-250 0-266 0-297 O-344 O-438o -484 0-563 mm. 6-356-35 6-75 7-548-73 II-II 12-30 3-18 TOLERANCES NUTS. s.in. 0-078 0-078 0-078 0-078 0-078 0-125 0-125 0-125 mm. 1-98 1-98 1-98 1-98 1-98 3-i8 3-18 3-i8 FOR O-688 0-750 mm. 9-53 9-53 11 -ii II-II 12-70 14-29 I7-46 19-05 0-266 0-2810-328 0-406 O-4530-563 mm. 5-956-35 6-757-14 8-33 10-32 II-5O 14-29 S.in. 0-078 0-078 0-078 0-078 0-078 0-125 0-125 0-125 mm. 1-98 1-98 1-98 1-98 1-98 3-iS 0.in. 0-078 0-078 0-094 0-094 0-094 0-125 0-125 0-188 •98 •98 •-38 •38 •38 •18 •18 •76 M.in. 0-156 0-172 0-172 0-188 0-234 0-281 0-328 O-375mm. 3-974-37 4-374-76 5-957-14 8-339-53 L.in. 0-016 0-116 0-031 0-031 0-031 0-031 0-047 0-047 mm. 0-40 o -40o-8o o-8oo-8o o-8o 1-19 1-19 O.in. 0-078 0-078 0-094 0-094 0-094 0-125 0-125 0-188 mm. 1-98 1-98 2-38 2-38 2-38 3-i8 3-184-76 CASTLE R.in. 0-094 0-094 0-094 o -094 0-094 0-094 0-125 0-125 mm. 2-38 2-38 2-38 2-38 2-38 2-38 3-18 3-18 6-35-287-94-24 9-53-24 II-11-20 12-70-20 NOTE.—Chamfer to be omitted on sizes smaller than 0.250 in. diameter. GENERAL.—1. The general specifications, 1G1, shall form according to their applicability, a part of these specifications. USE.—2. Tbesenuts are to be used on bolts (I.A.S.B. specification 4P3). DIMENSIONS AND TOLERANCES.—7. The nuts shall be of the form shown in figures 1, 2, and 3, and shall conform to the dimensions within the tolerances given in Tables I, 2, and 3. The values represent the finished dimensions after copper and nickel plating. DELIVERY, PACKING, AND SHIPPING.—8. The nuts shall be delivered in boxes of gross weight not exceeding 50 1b. (22.7 kg.). The lots of individual sizes shall be packed in strong manila envelopes or cartons. 4P5—Specifications for Square and Round Bevel Washers. GENERAL.—1. The general specifications, 1G1, shall form, according to their applicability, a part of these specifications. USE.—2. These washers are to be used on bolts (I.A.S.B. specification 4P3). MATERIAL.—3. The washers shall be machined from cold-rolled or drawn steel (I.A.S.B. specification 3S20). MANUFACTURE.—4. The washers may be cut by shearing if this can be done without distorting the surface. They shall be cyanide hardened. The washers shall be copper- plated in a cyanide bath and then nickel-plated ; the coating shall not exceed 0.001 in. (0.0254 mm.) in thickness. WORKMANSHIP AND FINISH.—5. Both sides must be flat and free from burrs. PHYSICAL PROPERTIES AND TESTS.—6. Washers selected for the bend test shall be firmly clamped in a square nose vice and bent through an angle of 30 degrees. They shall withstand this bending without cracking. One of every 250 washers shall be subjected to the bend test. DIMENSIONS AND TOLERANCES.—7. The washers shall be of the form shown in figures 1 and 2 and shall conform to the. Fio. 1. SQUASH WASHER FIG. 2. BOUND WASBKE dimensions within the tolerances given in following table.The values represent the finished dimensions after copper and nickel plating. DIMENSIONS AND TOLERANCES FOR BEVEL . , WASHERS. No. 46 8 10 12 [Values of angles are 6,12,24 or 36 degrees for all sites.] Bolt size-. .—-H. » D. L. Bolt size H. D. Milli- Milli- Milli-inch 0-II2 0-138 0-164 0-190 0-216 O-2JO 0-312O-375 O-437 0-500 No. 31 26 17 inch 0 -120 O-I47 O-I73 0-199 0-228 0-266 0-328 0-391 DELIVERY, o-5K PACKING, inch0-375 0-438 0-469 0-500 0-563 0-625 0-688 0-750 0-938 i-ooo inch0-375 O-3750-469 0-469 0-531 0-531 0-656 0-656 0-875 0-875 metres2-85 3-51 4-17 4-835-49 6-357-93 9-52 II-II12-70 metres 3-D5 3-73 4-39 5 -OS 6-oo 6-75 8-33 9-92 11-50 13-10 metres9-53 11 -ii it-91 12-70 14-2915-88 17-4619-05 23-8125 'to AND SHIPPING.—8. The Milli-metres 9*539-53 11-91 II -0113*49 I3'4916-67 16-6922-23 22-23 washers ^M^-; Fig. 1. Fig. 2. MATERIAL.—3. The nuts shall be machined from cold- rolled or drawn steel, I.A.S.B. specification 3S20. MANUFACTURE.—4. The nuts shall be cyanide hardened. The nuts shall be copper-plated in a cyanide bath and then nickel-plated ; the coating shall not exceed 0.001 in. (0.0254 mm.). WORKMANSHIP AND FINISH.—5. The inside face shall be flat and free from burrs. PHYSICAL PROPERTIES AND TESTS.—6. Nuts shall withstand having the inside diameter increased 25 per cent, by drifting without cracking. One per cent, of each size of all nuts shall be subjected to the drift test. Chamfer Til to;, to Dia ".A" . : .-,, ./;••' • -• -r" \ • ; Fig. 3.; • .",••/. ,.';..; shall be delivered in boxes of gross weight not exceeding 50 lb. (22.7 kg.). The lots of individual sizes shall be packed in strong manila envelopes or cartons. [To be continued.) K a K M The Future of Aerial Transport. THERE should be a good audience in the Lecture Theatre of the Literary and Philosophical Society, Newcastle-on-Tyne, on Tuesday, 23rd inst., at 6 p.m., when Mr. G. Holt Thomas will lecture under the auspices of the N.E. Coast Institution of Engineers and Shipbuilders on " The Future of Aerial Trans- port." The lecture will be illustrated by cinematograph films. 429
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