Oblý závit - Rd
Oblé závity se používají u extrémně namáhaných a často rozebíraných spojů, nebo u spojů vystavených povětrnostním vlivům. Příkladem použití mohou být různé armatury nebo vagónové spojky. Označují se písmeny Rd a vnějším průměrem závitu – např. Rd 32. Stoupání oblého závitů se udává jako počet závitů na 1“.
U běžného spojovacího materiálu se oblý závit nepoužívá, jedná se výhradně o speciální výkresové díly, kde je tento typ závitu navržen konstruktéry.
Oblý závit dle norem ČSN 01 4037, DIN 405
| Jmenovitý průměr D [mm] | počet závitů na 1" | P stoupání [mm] | D4 [mm] | D1 [mm] | R1 [mm] | R2 [mm] | R3 [mm] |
| 8 | 10 | 2,54 | 8,254 | 5,714 | 0,606 | 0,65 | 0,561 |
| 9 | 10 | 2,54 | 9,254 | 6,714 | 0,606 | 0,65 | 0,561 |
| 10 | 10 | 2,54 | 10,254 | 7,714 | 0,606 | 0,65 | 0,561 |
| 11 | 10 | 2,54 | 11,254 | 8,714 | 0,606 | 0,65 | 0,561 |
| 12 | 10 | 2,54 | 12,254 | 9,714 | 0,606 | 0,65 | 0,561 |
| 14 | 8 | 3,175 | 14,318 | 11,142 | 0,757 | 0,813 | 0,702 |
| 16 | 8 | 3,175 | 16,318 | 13,142 | 0,757 | 0,813 | 0,702 |
| 18 | 8 | 3,175 | 18,318 | 15,142 | 0,757 | 0,813 | 0,702 |
| 20 | 8 | 3,175 | 20,318 | 17,142 | 0,757 | 0,813 | 0,702 |
| 22 | 8 | 3,175 | 22,318 | 19,142 | 0,757 | 0,813 | 0,702 |
| 24 | 8 | 3,175 | 24,318 | 21,142 | 0,757 | 0,813 | 0,702 |
| 26 | 8 | 3,175 | 26,318 | 23,142 | 0,757 | 0,813 | 0,702 |
| 28 | 8 | 3,175 | 28,318 | 25,142 | 0,757 | 0,813 | 0,702 |
| 30 | 8 | 3,175 | 30,318 | 27,142 | 0,757 | 0,813 | 0,702 |
| 32 | 8 | 3,175 | 32,318 | 29,142 | 0,757 | 0,813 | 0,702 |
| 34 | 8 | 3,175 | 34,318 | 31,142 | 0,757 | 0,813 | 0,702 |
| 36 | 8 | 3,175 | 36,318 | 33,142 | 0,757 | 0,813 | 0,702 |
| 38 | 8 | 3,175 | 38,318 | 35,142 | 0,757 | 0,813 | 0,702 |
| 40 | 6 | 4,233 | 40,423 | 36,19 | 1,01 | 1,084 | 0,936 |
| 42 | 6 | 4,233 | 42,423 | 38,19 | 1,01 | 1,084 | 0,936 |
| 44 | 6 | 4,233 | 44,423 | 40,19 | 1,01 | 1,084 | 0,936 |
| 46 | 6 | 4,233 | 46,423 | 42,19 | 1,01 | 1,084 | 0,936 |
| 48 | 6 | 4,233 | 48,423 | 44,19 | 1,01 | 1,084 | 0,936 |
| 50 | 6 | 4,233 | 50,423 | 46,19 | 1,01 | 1,084 | 0,936 |
| 52 | 6 | 4,233 | 52,423 | 48,19 | 1,01 | 1,084 | 0,936 |
| 55 | 6 | 4,233 | 55,423 | 51,19 | 1,01 | 1,084 | 0,936 |
| 58 | 6 | 4,233 | 58,423 | 54,19 | 1,01 | 1,084 | 0,936 |
| 60 | 6 | 4,233 | 60,423 | 56,19 | 1,01 | 1,084 | 0,936 |
| 62 | 6 | 4,233 | 62,423 | 58,19 | 1,01 | 1,084 | 0,936 |
| 65 | 6 | 4,233 | 65,423 | 61,19 | 1,01 | 1,084 | 0,936 |
| 68 | 6 | 4,233 | 68,423 | 64,19 | 1,01 | 1,084 | 0,936 |
| 70 | 6 | 4,233 | 70,423 | 66,19 | 1,01 | 1,084 | 0,936 |
| 72 | 6 | 4,233 | 72,423 | 68,19 | 1,01 | 1,084 | 0,936 |
| 75 | 6 | 4,233 | 75,423 | 71,19 | 1,01 | 1,084 | 0,936 |
| 78 | 6 | 4,233 | 78,423 | 74,19 | 1,01 | 1,084 | 0,936 |
| 80 | 6 | 4,233 | 80,423 | 76,19 | 1,01 | 1,084 | 0,936 |
| 82 | 6 | 4,233 | 82,423 | 78,19 | 1,01 | 1,084 | 0,936 |
| 85 | 6 | 4,233 | 85,423 | 81,19 | 1,01 | 1,084 | 0,936 |
| 88 | 6 | 4,233 | 88,423 | 84,19 | 1,01 | 1,084 | 0,936 |
| 90 | 6 | 4,233 | 90,423 | 86,19 | 1,01 | 1,084 | 0,936 |
| 92 | 6 | 4,233 | 92,423 | 88,19 | 1,01 | 1,084 | 0,936 |
| 95 | 6 | 4,233 | 95,423 | 91,19 | 1,01 | 1,084 | 0,936 |
| 98 | 6 | 4,233 | 98,423 | 94,19 | 1,01 | 1,084 | 0,936 |
| 100 | 6 | 4,233 | 100,423 | 96,19 | 1,01 | 1,084 | 0,936 |
| 105 | 4 | 6,35 | 105,635 | 99,285 | 1,515 | 1,625 | 1,404 |
| 110 | 4 | 6,35 | 110,635 | 104,285 | 1,515 | 1,625 | 1,404 |
| 115 | 4 | 6,35 | 115,635 | 109,285 | 1,515 | 1,625 | 1,404 |
| 120 | 4 | 6,35 | 120,635 | 114,285 | 1,515 | 1,625 | 1,404 |
| 125 | 4 | 6,35 | 119,285 | 1,515 | 1,625 | 1,404 | |
| 130 | 4 | 6,35 | 124,285 | 1,515 | 1,625 | 1,404 | |
| 135 | 4 | 6,35 | 129,285 | 1,515 | 1,625 | 1,404 | |
| 140 | 4 | 6,35 | 134,285 | 1,515 | 1,625 | 1,404 | |
| 145 | 4 | 6,35 | 139,285 | 1,515 | 1,625 | 1,404 | |
| 150 | 4 | 6,35 | 144,285 | 1,515 | 1,625 | 1,404 | |
| 155 | 4 | 6,35 | 149,285 | 1,515 | 1,625 | 1,404 | |
| 160 | 4 | 6,35 | 154,285 | 1,515 | 1,625 | 1,404 | |
| 165 | 4 | 6,35 | 159,285 | 1,515 | 1,625 | 1,404 | |
| 170 | 4 | 6,35 | 164,285 | 1,515 | 1,625 | 1,404 | |
| 175 | 4 | 6,35 | 169,285 | 1,515 | 1,625 | 1,404 | |
| 180 | 4 | 6,35 | 174,285 | 1,515 | 1,625 | 1,404 | |
| 185 | 4 | 6,35 | 179,285 | 1,515 | 1,625 | 1,404 | |
| 190 | 4 | 6,35 | 184,285 | 1,515 | 1,625 | 1,404 | |
| 195 | 4 | 6,35 | 189,285 | 1,515 | 1,625 | 1,404 | |
| 200 | 4 |
6,35
|
194,285 | 1,515 | 1,625 | 1,404 |
