344 HARDWARE & WIRING 5/8 (11) 5/8 (18) 1/2 (20) 1/2 (13) 7/16 (14) 7/16 (20) 1/4 (28) 1/4 (20) 5/16 (24) 5/16 (18) 3/8 (24) 3/8 (16) 10/32 8/32 4/40 10/24 6/32 IDENTIFY YOUR BOLT THREAD - SCALE 1:1 GW - BUTTONHEAD - CHROME 4/40 6/32 8/32 10/32 10/24 12/24 1/4-28 1/4-20 5/16-24 5/16-18 3/8-24 3/8-16 7/16-20 7/16-14 1/2-20 Length 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 1/4" 913087 913102 913126 910151 913150 -- -- -- -- -- -- -- -- -- -- 3/8" -- 913104 913128 910153 913152 -- 913205 913204 512269 513268 -- -- -- -- -- 1/2" 913089 913106 914130 510866 913154 -- 913207 502155 512452 502210 512458 913322 -- -- -- 5/8" -- 913108 915132 913157 913156 -- 913209 502160 513273 513272 -- 913324 -- -- -- 3/4" -- -- 913134 913159 913158 -- 913211 502165 512453 502215 512459 502245 -- -- -- 7/8" -- -- -- 913161 913160 -- 913213 502170 513279 513278 -- 513328 -- -- -- 1" -- 913114 913138 913163 913162 913194 913215 502175 512454 502220 512461 502250 -- 913376 -- 1 1/4" -- -- 913140 913167 912166 -- 912219 502180 511286 502225 512462 502255 913379 913378 -- 1-1/2" -- -- -- 913169 912168 -- 913221 502185 512456 502230 512463 502260 913381 913380 -- 1 3/4" -- -- -- -- -- -- -- 502190 512457 502235 512464 502265 -- 911382 -- 2" -- -- -- -- -- -- -- 502195 -- 502240 512466 502270 -- -- -- 2 1/4" -- -- -- -- -- -- -- 502200 -- -- 512477 502342 -- -- -- 2-1/2" -- -- -- -- -- -- -- 502205 -- 913294 512488 502346 -- -- -- 2 3/4" -- -- -- -- -- -- -- -- -- 913296 -- 502347 -- -- -- 3" -- -- -- -- -- -- -- -- -- 913298 -- 502348 -- -- -- 1/2-13 5/8-18 5/8-11 Length 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 5pk 1/4" -- -- -- 3/8" -- -- -- 1/2" -- -- -- 5/8" -- -- -- 3/4" 512467 -- -- 7/8" -- -- -- 1" 913416 -- 913488 1 1/4" 913418 -- 913490 1-1/2" 913420 -- 913492 1 3/4" 913422 -- -- 2" 913424 -- 913496 2 1/4" -- -- -- 2-1/2" 913428 -- 913500 2 3/4" -- -- -- 3" -- -- 913504 GRADE 8 To find out what bolt thread you have, just place your old bolt on the bottom of this page. Carefully check if the thread of your bolt is identical to the 'silhouette thread' as pictured. We have the FULL selection! Threads & sizes that are not mentioned are not produced by Gardner-Westcott AMERICAN BOLTS & NUTS - Lengths are measured in inches. 1 inch is 2.54 centimetres. - Most common bolt sizes are 1/4", 5/16" and 3/8" (thread ø). - Most sizes are available in 2 different thread type's, UNF and UNC. - UNF is fine thread, most used in steel. - UNC is coarse thread, most used in aluminum. - 1/4" thread is in dia close to M6 - 5/16" thread is in dia close to M8 - 3/8" thread is in dia close to M10 - 7/16" thread is in dia close to 11mm - 1/2" thread is in dia close to 12,5mm - 5/8" thread is in dia close to 16mm tech-tip 108 521124 Metric + UNF/UNC 521125 Metric LIMIT, THREAD PITCH GAUGE Identify the threads on your bolt in case of doubt. Measures windings per inch (USA) or per millimeter (Metric). 521124 Metric + UNF/UNC (24 + 30 blades) 521125 Metric thread (24 blades)
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