Page 443 - THREADING CATALOG

DCNT (UNC/UNF) DC_2
Drill Body with Exchangeable
Heads, Chamfering Inserts, DC k7 DCONMS DF

Internal Coolant and One Flat
Shank. Used for Pre-Tread Holes. PL SDL .236
LTA LS

I N C H THREAD DRILLING
Designation Dnominal (1) FTDZ (2) DCN (3) DCX (4) DC_2 SDL PL LTA DCONMS DF LS SSC (5)
DCNT 0315-100-050A-3/8UNC .315 3/8 .315 .331 .590 1.0000 .04700 1.950 .500 .669 1.770 8.0
DCNT0370-106-050A-7/16UNC .370 7/8 .354 .370 .630 1.0600 .05600 2.060 .500 .709 1.770 9.0
DCNT0425-106-063A-1/2UNC .425 1/2 .413 .429 .689 1.0600 .06500 2.090 .625 .787 1.890 10.0
DCNT0484-106-063A-9/16UNC .484 9/16 .472 .488 .748 1.0600 .07400 2.150 .625 .827 1.890 12.0
DCNT0531-120-063A-5/8UNC .531 5/8 .512 .528 .787 1.2000 .08100 2.300 .625 .866 1.890 13.0
DCNT0650-140-075A-3/4UNC .650 3/4 .630 .665 .905 1.4000 .09900 2.640 .750 .984 1.970 16.0
DCNT0768-165-100A-7/8UNC .768 7/8 .748 .783 1.024 1.6500 .11700 3.010 1.000 1.260 2.200 19.0
DCNT 0335-100-050A-3/8UNF .335 3/8 .315 .331 .590 1.0000 .05100 1.950 .500 .669 1.770 8.0
DCNT0390-106-050A-7/16UNF .390 7/16 .374 .390 .650 1.0600 .06000 2.060 .500 .709 1.770 9.0
DCNT0453-106-063A-1/2UNF .453 1/2 .453 .469 .728 1.0600 .06900 2.120 .625 .787 1.890 11.0
DCNT0508-106-063A-9/16UNF .508 9/16 .492 .508 .768 1.0600 .07800 2.170 .625 .827 1.890 12.0
DCNT0571-120-063A-5/8UNF .571 5/8 .571 .587 .827 1.2000 .08700 2.340 .625 .906 1.890 14.0
DCNT0689-140-075A-3/4UNF .689 3/4 .669 .705 .945 1.4000 .10600 2.700 .750 1.063 1.970 17.0
DCNT0807-165-100A-7/8UNF .807 7/8 .787 .823 1.063 1.6500 .12200 3.080 1.000 1.260 2.200 20.0
• Hole tolerance: D+.002" in average conditions. However, it can be higher or lower according to machine and tooling conditions
• Do not mount smaller drilling heads other than the specified range of the drill body.
(1) Pre-thread hole diameter
(2) Used for standard thread size
(3) Cutting diameter minimum
(4) Cutting diameter maximum
(5) Seat size code
Inserts: IHP • ICP • ICP-2M • ICK • ICK-2M • ICM • ICN • QCP-2M • HCP-IQ • FCP • ICG • AOMT-Chamfering
1 Drilling pre-thread blind holes: 2 Drilling pre-thread through holes:
drilling with a 45° chamfer drilling with a 45° chamfer

Pre-Thread Recommended Hole Diameters with DCNT Drills
UNC
Dia. UNF UNC Helicoil BSW BSF
Drill Designation Range Thread Head Dia. Thread Head Dia. Thread Head Dia. Thread Head Dia. Thread Head Dia.
DCNT 0315-100-050A-3/8UNC .315 - .354 UNF3/8-24 .335 UNC3/8-16 .315 UNC5/16-18 .331
DCNT 0370-106-050A-7/16UNC .354 - .393 UNF7/16-20 .390 UNC7/16-14 .370
DCNT 0425-106-063A-1/2UNC .413 - .429 UNC1/2-13 .425 BSW1/2-12 .413 BSF1/2-16 .429
DCNT 0484-106-063A-9/16UNC .472 - .511 UNF9/16-18 .508 UNC9/16-12 .484 BSF9/16-16 .492
DCNT 0531-120-063A-5/8UNC .512 - .551 UNC5/8-11 .531
DCNT 0650-140-075A-3/4UNC .630 - .669 UNC3/4-10 .650
DCNT 0768-165-100A-7/8UNC .748 - .787 UNC7/8-9 .768
UNJF Helicoil
Drill Designation Dia. Range NPT Thread Head Dia. BSP Thread Head Dia. UNEF Thread Head Dia. Thread Head Dia.
DCNT 0315-100-050A-3/8UNC .315 - .354 NPT1/8-27 .335 G1/8-28 .346 UNEF3/8-32 .343 UNJF3/8-24 .339
UNC Helicoil
Drill Designation Dia. Range UNF Thread Head Dia. UNC Thread Head Dia. Thread Head Dia. BSF Thread Head Dia.
DCNT 0335-100-050A-3/8UNF .315 - .354 UNF3/8-24 .335 UNC3/8-16 .315 UNC5/16-18 .331
DCNT 0390-106-050A-7/16UNF .374 - .393 UNF7/16-20 .390
DCNT 0453-106-063A-1/2UNF .453 - .472 UNF1/2-20 .453
DCNT 0508-106-063A-9/16UNF .492 - .511 UNF9/16-18 .508 BSF9/16-16 .492
DCNT 0571-120-063A-5/8UNF .551 - .590 UNF5/8-18 .571
DCNT 0689-140-075A-3/4UNF .669 - .708 UNF3/4-16 .689
DCNT 0807-165-100A-7/8UNF .787 - .826 UNF7/8-14 .807
UNJF Helicoil
Drill Designation Dia. Range NPT Thread Head Dia. BSP Thread Head Dia. UNEF Thread Head Dia. Thread Head Dia.
DCNT 0335-100-050A-3/8UNF .315 - .354 NPT1/8-27 .335 G1/8-28 .346 UNEF3/8-32 .343 UNJF3/8-24 .339
DCNT 0571-120-063A-5/8UNF .551 - .590 NPT3/8-18 .571 UNEF5/8-24 .583 UNJF5/8-18 .571
DCNT 0689-140-075A-3/4UNF .669 - .708 NPT1/2-14 .689 UNEF3/4-20 .701

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