Spiral Groove Precision Ground Pull Dowels Technical Data Material: Alloy Steel Length Tolerance: ± .010" Core Hardness: 47 - 58 Rockwell C Diameter Tolerance: ± .0001" Surface Hardness: 60 - 64 Rockwell C Recommended Hole Size: .0005" under Nom. Dia. Surface Finish: 8 Micro-Inch Specification: ASME B18.8.2 Flat Vent Standard Round Spiral Groove Flat Vent Standard Round Nominal Actual Length Internal Thread 31800 31400 31600 1/4 .2502 1/2 8 - 32 31801 31401 31601 1/4 .2502 3/4 8 - 32 31802 31402 31602 1/4 .2502 1 8 - 32 31803 31403 31603 1/4 .2502 1-1/4 8 - 32 31804 31404 31604 1/4 .2502 1-1/2 8 - 32 31805 31405 31605 1/4 .2502 1-3/4 8 - 32 31806 31406 31606 1/4 .2502 2 8 - 32 31807 31407 31654 1/4 .2502 2-1/4 8 - 32 31808 31408 31607 1/4 .2502 2-1/2 8 - 32 31809 31409 31608 5/16 .3127 3/4 10 - 32 31810 31410 31609 5/16 .3127 1 10 - 32 31811 31411 31610 5/16 .3127 1-1/4 10 - 32 31812 31412 31611 5/16 .3127 1-1/2 10 - 32 31813 31413 31612 5/16 .3127 2 10 - 32 31814 31414 31613 5/16 .3127 2-1/4 10 - 32 31815 31415 31614 5/16 .3127 2-1/2 10 - 32 31816 31416 31615 3/8 .3752 3/4 10 - 32 31817 31417 31616 3/8 .3752 1 10 - 32 31818 31418 31617 3/8 .3752 1-1/4 10 - 32 31819 31419 31618 3/8 .3752 1-1/2 10 - 32 31820 31420 31619 3/8 .3752 1-3/4 10 - 32 31821 31421 31620 3/8 .3752 2 10 - 32 31822 31422 31621 3/8 .3752 2-1/4 10 - 32 31823 31423 31622 3/8 .3752 2-1/2 10 - 32 31824 31424 31623 3/8 .3752 3 10 - 32 31825 31425 31624 7/16 .4377 1 1/4 - 20 31826 31426 31625 7/16 .4377 1-1/2 1/4 - 20 31827 31427 31626 7/16 .4377 2 1/4 - 20 31828 31428 31627 1/2 .5002 3/4 1/4 - 20 31829 31429 31628 1/2 .5002 1 1/4 - 20 31830 31430 31629 1/2 .5002 1-1/4 1/4 - 20 31831 31431 31630 1/2 .5002 1-1/2 1/4 - 20 31832 31432 31631 1/2 .5002 1-3/4 1/4 - 20 31833 31433 31632 1/2 .5002 2 1/4 - 20 31834 31434 31633 1/2 .5002 2-1/4 1/4 - 20 31835 31435 31634 1/2 .5002 2-1/2 1/4 - 20 31836 31436 31635 1/2 .5002 3 1/4 - 20 31837 31437 31636 1/2 .5002 3-1/2 1/4 - 20 31838 31438 31637 1/2 .5002 4 1/4 - 20 31839 31439 31638 5/8 .6252 1-1/4 1/4 - 20 31840 31440 31639 5/8 .6252 1-1/2 1/4 - 20 31841 31441 31640 5/8 .6252 2 1/4 - 20 31842 31442 31641 5/8 .6252 2-1/4 1/4 - 20 31843 31443 31642 5/8 .6252 2-1/2 1/4 - 20 31844 31444 31643 5/8 .6252 3 1/4 - 20 31845 31445 31644 5/8 .6252 4 1/4 - 20 31846 31446 31645 3/4 .7502 1-1/2 5/16 - 18 31847 31456 31655 3/4 .7502 1-3/4 5/16 - 18 31848 31447 31646 3/4 .7502 2 5/16 - 18 31849 31448 31647 3/4 .7502 2-1/2 5/16 - 18 31850 31449 31648 3/4 .7502 3 5/16 - 18 31851 31450 31649 3/4 .7502 4 5/16 - 18 31856* 31451 31656 1 1.0002 1-3/4 5/16 - 18 31852* 31452 31650 1 1.0002 2 5/16 - 18 31853* 31453 31651 1 1.0002 2-1/2 5/16 - 18 31854* 31454 31652 1 1.0002 3 5/16 - 18 31855* 31455 31653 1 1.0002 4 5/16 - 18 *3/8-16 Internal Thread LOCATING COMPONENTS LOCATING COMPONENTS workholding solutions Phone: 877-426-2504 | Fax: +1 216-481-6193 | E-mail: info@jergensinc.com | www.jergensinc.com 239
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