BobTail System

Standard Head Style and Strength Levels DIA. ROUND FLANGED 1/2" Grade 5 Grade 8 5/8" Grade 5 Grade 8 3/4" Grade 5 Grade 8 7/8" Grade 5 Grade 8 Upon Request 1" Grade 8 Grade 5 12mm Class 8.8 Upon Request Class 10.9 14mm Class 8.8 Class 10.9, Class 8.8 16mm Class 8.8 Upon Request Class 10.9 20mm Class 8.8 Upon Request Class 10.9 Fastener Dimensions DIA. A MAX ROUND HEAD FLANGED HEAD STAINLESS STEEL CAP TRUSS / 90º / 30 B C B C B C B C 1/2" .500 .953 - .861 .297 - .335 — — — — Upon Request — 5/8" .625 1.086 - 1.196 .367 - .432 1.270 - 1.330 .448 - .499 1.270 - 1.330 .300 - .340 Upon Request — 3/4" .750 1.326 - 1.440 .455 - .530 1.520 - 1.600 .550 - .600 — — — — 7/8" .875 1.540 - 1.665 .525 - .585 — — — — — — 1" 1.000 1.750 - 2.000 .590 - .650 — — — — — — 12mm 12.0 — — 24.1 - 25.4 8.9 - 9.6 — — — — 14mm 14.0 — — 30.0 max 11.5 max — — — — 16mm 16.0 — — 32.3 - 33.8 11.4 - 12.2 — — — — 20mm 20.0 — — 40.3 - 42.4 15.0 - 16.0 — — — — Round Truss Class 10.9 Standard Grade 8 Standard 5/8", 16mm Upon Request Upon Request Grade 5 Standard Class 8.8 Available Flanged 90˚ 30 SS Cap B F H J G Fit-Up Tab A D C E Data and Dimensions BobTail HuckBolts also available in thread-head configuration for limited clearance applications. 5 Howmet Fastening Systems