348 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 - HEX - ZINC GRADE 5 1/4-28 1/4-20 5/16-24 5/16-18 3/8-24 3/8-16 Length 5pk 25pk 5pk 25pk 5pk 25pk 5pk 25pk 5pk 25pk 5pk 25pk 1/2" -- 977016 -- 977032 -- 977050 -- 977070 -- 525284 -- 525303 5/8" -- 977017 -- 977033 -- 977051 -- 977071 -- 525285 -- 525304 3/4" -- 977018 -- 977034 -- 977052 -- 977072 -- 525286 -- 525305 7/8" -- 977019 -- 977035 -- 977053 -- 977073 -- 525287 -- 525306 1" -- 977020 -- 977036 -- 977054 927280 977074 -- 525288 -- 525307 1 1/4" -- 977021 -- 977037 907284 977055 927284 977075 507336 525289 907334 525308 1-1/2" -- 977022 907219 977038 907287 977056 907286 525271 907337 525290 907336 525309 1 3/4" 907223 977023 907222 977039 907289 977057 502661 525272 907339 525291 907338 525310 2" 507226 977024 907224 977040 907292 977058 907291 525273 907341 525292 907340 525311 2 1/4" 507227 977025 907226 977041 907293 977059 927292 525274 907343 525293 907342 525312 2-1/2" 907229 977026 907228 977042 507296 977060 907294 525275 907346 525294 907344 525313 2 3/4" 907231 977027 927230 977043 907297 977061 907296 525276 907347 525295 937346 525314 3" 907233 977028 907232 977044 907299 977062 907298 525277 907349 525296 907348 525315 3 1/4" 527235 977029 907234 977045 507301 977063 907301 525278 927351 525297 937350 525316 3-1/2" 527237 977030 907236 977046 507303 977064 907302 525279 907353 525298 907352 525317 4" 527241 977031 927240 977047 907307 977065 907306 525280 907357 525299 907356 525318 4-1/2" -- -- 927244 977048 927311 977066 907311 525281 907361 525300 937360 525319 5" -- -- 927246 977049 927313 977067 907312 525282 907363 525301 937362 525320 5-1/2" -- -- -- -- 927317 977068 907316 525283 907367 525302 937366 525321 6 -- -- -- -- 907319 977069 -- -- -- -- 937368 525322 7/16-20 7/16-14 1/2-20 1/2-13 5/8-18 5/8-11 Length 5pk 25pk 5pk 25pk 5pk 25pk 5pk 25pk 5pk 25pk 5pk 25pk 1/2" -- -- -- -- -- -- -- -- -- -- -- -- 5/8" -- -- -- -- -- -- -- -- -- -- -- -- 3/4" 937375 -- 907374 -- -- -- 907414 -- -- -- -- -- 7/8" -- -- -- -- -- -- -- -- -- -- -- -- 1" 907377 -- 907376 -- 907417 -- 907416 -- 521489 -- 521488 -- 1 1/4" 907379 -- 907378 -- 907419 -- 907418 -- 521491 -- 521490 -- 1-1/2" 907381 -- 937380 -- 907421 -- 937420 -- 521493 -- 521492 -- 1 3/4" 907383 -- 907382 -- 907423 -- 907422 -- 521495 -- 521494 -- 2" 907384 -- 937384 -- 907426 -- 907424 -- 521497 -- 521496 -- 2 1/4" 907387 -- 907386 -- 907427 -- 927426 -- 521499 -- 521498 -- 2-1/2" 907389 -- 907388 -- 907429 -- 907428 -- 521501 -- 521500 -- 2 3/4" 907391 -- 937390 -- 507431 -- 907431 -- 521503 -- 521502 -- 3" 907393 -- 907392 -- 907433 -- 907432 -- 521505 -- 521504 -- 3 1/4" 907395 -- 907394 -- 937435 -- 907434 -- 521507 -- 521506 -- 3-1/2" 907397 -- 907396 -- 907437 -- 907436 -- 521509 -- 521508 -- 4" 927401 -- 907401 -- 937441 -- 907441 -- 521513 -- 521512 -- 4-1/2" 927405 -- 907404 -- 937443 -- 907442 -- 521515 -- 521514 -- 5" 927407 -- 907406 -- 937445 -- 907444 -- 521517 -- 521516 -- 5-1/2" 927411 -- 927410 -- 937447 -- 907446 -- 521519 -- 521518 -- 6 -- -- 907412 -- 937520 -- -- -- -- -- 521522 -- 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. 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) 5pk & 25pk quantity We have the FULL selection! Threads & sizes that are not mentioned are not produced by Gardner-Westcott 521124 Metric + UNF/UNC 521125 Metric
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