National boilers, radiators, and specialties: catalog no. 26 (1920)
National Radiator Company · National Radiator Company · leaf 85
6 .42 .54 .60 m .40 .42 .48 .60 .78 3 .45 .48 .54 ■ 70 .96 33^ .50 .54 .60 .80 1.20 4 .60 .60 .75 .95 1.50 4^ .65 .72 .90 1.10 1.85 5 .70 .90 1.20 1.50 2.25 6 .80 1.30 1.60 2.00 2.80 7 1.00 1.80 2.20 2.80 3.60 8 1.10 2.40 3.00 3.60 4.40 9 1.20 3.00 3.80 4.40 5.30 10 1.30 3.60 4.60 5.20 6.20 12 1.85… … Adjustable Threader No. 1Adjustable Threading Devices The receding die feature of these tools is the secret of theireasy operation. The dies recede against taper pins in all but twotools. In the Nos. 0 and 10 the dies recede against a series oftapered steps. With a No. 1 machine one man can thread…
