Tabela de tamanhos de broca rosqueadora de rosca de parafuso para engenheiros mecânicos

Screw Threader Drill Size Chart for Mechanical Engineers

May 25, 2024 Roberto Magalhães

1. Metric Coarse Thread

Note	Nominal diameter	2nd class drill size
Note	Nominal diameter	Max.	Minimum
M1.0×0.25	0.75	0.785	0.729
M1.1×0.25	0.85	0.885	0.829
M1.2×0.25	0.95	0.985	0.985
M1.4×0.3	1.10	1,142	1,075
M1.6×0.35	1.25	1,321	1,221
M1.7×0.35	1.35	1,421	1,321
M1.8×0.35	1.45	1,521	1,421
M2.0×0.4	1.60	1,679	1,567
M2.2×0.45	1.75	1,838	1,713
M2.3×0.4	1.90	1979	1,867
M2.5×0.45	2.10	2,138	2013
M2.6×0.45	2.20	2,238	2,113
M3.0×0.5	2.50	2,599	2,459
M3.0×0.6	2:40 am	2,440	2,280
M3.5×0.6	2.90	3,010	2,850
M4.0×0.7	3:30 p.m.	3,422	3,242
M4.0×0.75	3.25	3,326	3,106
M4.5×0.75	3.80	3,878	3,688
M5.0×0.8	4:20 am	4,334	4,134
M5.0×0.9	4.10	4,170	3,930
M6.0×1.0	5:00	5,153	4,917
M7.0×1.0	6:00 am	6,153	5,917
M8.0×1.25	6.80	6,912	6,647
M9.0×1.25	7.80	7,912	7,647
M10×1.5	8:50 am	8,676	8,376
M11×1.5	9:50 am	9,676	9,376
M12×1.75	10:30 am	10,441	10,106
M14×2.0	12:00	12,210	11,835
M16×2.0	2:00 p.m.	14,210	13,835
M18×2.5	3:50 p.m.	15,744	15,294
M20×2.5	5:50 p.m.	17,744	17,294
M22×2.5	7:50 p.m.	19,744	19,294
M24×3.0	9 p.m.	21,252	20,752
M27×3.0	24:00	24,252	23,752
M30×3.5	26:50	26,771	26,211

2. UNC Topic (Unified Coarse)

Note (UNC)	Nominal diameter	2nd class drill size
Note (UNC)	Nominal diameter	Max.	Minimum
NO.1-64(1,854)	1.55	1,582	1,425
NO.2-56(2,184)	1.80	1,871	1,695
NO.3-48(2,515)	2.10	2,146	1,941
NO.4-40(2,845)	2:30 p.m.	2,385	2,157
NO.5-40(3,175)	2.60	2,697	2,487
NO.6-32(3,505)	2.80	2,895	2,642
NO8-32(4,166)	3:40 am	3.53	3,302
NO.10-24(4,826)	3.90	3,962	3,683
NO.12-24(5,486)	4.50	4,597	4,344
1/4-20	5.10	5,257	4,979
05/16-18	6.60	6,731	6,401
8/3-16	8:00 am	8,153	7,798
07/16-14	9:40 am	9:55 am	9,144
1/2-13	10.80	11,023	10,592
16/09-12	12:20 p.m.	12,446	11,989
08/05-11	1:60 p.m.	12,868	13,386
3/4-10	4:50 p.m.	18,840	16,307
7/8-9	7:50 p.m.	19,761	19,177
1	10:20 p.m.	22,606	21,971
1-1/8-7	25:00	25,349	24,638
1-1/4-7	28:20	28,524	27,813
1-3/8-6	30.80	31,115	30,353
1-1/2-6	34:00	34,290	33,528
1-3/4-5	39.50	39,827	38,964
2-4-1/2	45.20	45,593	44,679

3. Metric Fine Thread

Note	Nominal diameter	2nd class drill size
Note	Nominal diameter	Max.	Minimum
M1.0×0.2	0.80	0.821	0.783
M1.1×0.2	0.90	0.921	0.883
M1.2×0.2	1.00	1,021	0.983
M1.4×0.2	1.20	1,221	1,183
M1.6×0.2	1.40	1,421	1,383
M1.7×0.2	1.45	1,500	1,460
M1.8×0.2	1.60	1,621	1,583
M2.0×0.25	1.75	1,785	1,729
M2.2×0.25	1.95	1985	1,929
M2.3×0.25	2.05	2,061	2001
M2.5×0.35	2.20	2,221	2,121
M2.6×0.35	2.20	2,246	2,186
M3.0×0.35	2.70	2,721	2,621
M3.5×0.35	3.20	3,221	3,121
M4.0×0.5	3.50	3,599	3,459
M4.5×0.5	4:00	4,099	3,959
M5.0×0.5	4.50	4,599	4,459
M5.5×0.5	5:00	5,099	4,959
M6.0×0.75	5:30 p.m.	5,378	5,188
M6.0×0.5	5.50	5,550	5,400
M7.0×0.75	6:30 am	6,378	6,188
M7.0×0.5	6:50 am	6,550	6,400
M8.0×1.0	7:00	7,153	6,917
M8.0×0.75	7:30 am	7,378	7,188
M8.0×0.5	7:50 am	7,520	7,400
M9.0×1.0	8:00 am	8,153	7,917
M9.0×0.75	8:30 am	8,378	8,188
M10×1.25	8.80	8,912	8,647
M10×1.0	9:00 am	9,153	8,917
M10×0.75	9:30 am	9,378	9,188
M10×0.5	9:50 am	9,520	9,400
M11×1.0	10:00	10,153	9,917
M11×0.75	10:30 am	10,378	10,188
M12×1.5	10:50 am	10,676	10,376
M12×1.25	10.80	10,912	10,647
M12×1.0	11:00	11,153	10,917
M12×0.5	11:50 am	11,520	11,400
M14×1.5	12:50	12,676	12,376
M14×1.0	1:00 p.m.	13,153	12,917
M15×1.5	1:50 p.m.	13,676	13,376
M15×1.0	2:00 p.m.	14,153	13,917
M16×1.5	2:50 p.m.	14,676	14,376
M16×1.0	3:00 p.m.	15,153	14,917
M17×1.5	3:50 p.m.	15,676	15,376
M17×1.0	4:00 p.m.	16,153	15,917
M18×2.0	4:00 p.m.	16,210	15,835
M18×1.5	4:50 p.m.	16,676	16,376
M18×1.0	17:00	17,153	16,917
M20×2.0	6:00 p.m.	18,210	17,835
M20×1.5	6:50 p.m.	18,676	18,376
M20×1.0	7:00 p.m.	19,153	18,917
M22×2.0	8 p.m.	20,210	19,835
M22×1.5	8:50 p.m.	20,676	20,376
M22×1.0	9 p.m.	21,153	20,917
M24×2.0	10 p.m.	22,210	21,835
M24×1.5	10:50 p.m.	22,676	22,376
M24×1.0	23:00	23,153	22,917
M25×2.0	23:00	23,210	22,835
M25×1.5	11:50 p.m.	23,676	23,376
M25×1.0	24:00	24,153	23,917
M26×1.5	24:50	24,676	24,376
M27×2.0	25:00	25,210	24,835
M27×1.5	25:50	25,676	25,376
M27×1.0	26:00	26,153	25,917
M28×2.0	26:00	26,210	25,835
M28×1.5	26:50	26,676	26,376
M28×1.0	27:00	27,153	26,917
M30×3.0	27:00	27,252	26,752
M30×2.0	28:00	28,210	27,835
M30×1.5	28:50	28,676	28,376
M30×1.0	29:00	29,153	28,917
M32×2.0	30:00	30,210	29,835
M32×1.5	30:50	30,676	30,376
M33×3.0	30:00	30,252	29,752
M33×2.0	31:00	31,210	30,835
M33×1.5	31:50	31,676	31,376
M35×1.5	33.50	33,676	33,376
M36×3.0	33:00	33,252	32,752
M36×2.0	34:00	34,210	33,835
M36×1.5	34.50	34,676	34,376

4. Unified Hairline

Note (UNC)	Nominal diameter	2nd class drill size
Note (UNC)	Nominal diameter	Max.	Minimum
NO.0-80(1,524)	1.25	1,305	1,182
NO.1-72(1,854)	1.55	1,612	1,474
NO.2-64(2,184)	1.85	1,912	1,756
NO.3-56(2,515)	2.10	2,197	2025
NO.4-48(2,845)	2:40 am	2,458	2,271
NO.5-44(3.175)	2.70	2,740	2,551
NO.6-40(3,505)	2.90	3,022	2,820
NO.8-36(4,166)	3.50	3,606	3,404
NO.10-32(4,826)	4.10	4,165	3,963
NO.12-28(5,846)	4.60	4,724	4,496
1/4-28	5.50	5,588	5,360
16/05 to 24	6.90	7,035	6,782
8/3-24	8:50 am	8,636	8,382
07/16-20	9:90 am	10,033	9,729
1/2-20	11:50 am	11,607	11,329
09/16-18	12:90 p.m.	13,081	12,751
08/05-18	2:50 p.m.	14,681	14,351
3/4-16	5:50 p.m.	17,678	17,323
07/08-14	8:50 p.m.	20,675	20,270
1-12	11:20 p.m.	23,571	23,114
1-1/8-12	26:50	26,746	26,289
1-1/4-12	29:50	29,921	29,464
1-3/8-12	32.80	33,096	32,639
1-1/2-12	36:00	36,271	35,814

5. Male drill diameter with metric thread

Note	Accuracy level
Note	G4-G6	G7-G8	G9
M1.0×0.25	0.86	0.88	－
M1.1×0.25	0.96	0.98	－
M1.2×0.25	1.06	1.08	－
M1.4×0.3	1.24	1.25	－
M1.6×0.35	1.41	1.43	－
M1.7×0.35	1.51	1.53	－
M1.8×0.35	1.61	1.63	－
M2.0×0.4	1.78	1.80	－
M2.2×0.45	1.95	1.98	－
M2.3×0.4	2.08	2.10	－
M2.5×0.45	2.25	2.28	－
M2.6×0.45	2.35	2.38	－
M3.0×0.5	2.73	2.75	－
M3.5×0.6	3.17	3.20	－
M4.0×0.7	3.62	3.65	3.69
M5.0×0.8	4.56	4.60	4.64
M6.0×1.0	5.45	5.50	5.55
M7.0×1.0	6:45 am	6:50 am	6.55
M8.0×1.25	7.31	7.38	7.44
M10×1.5	9.18	9:25 am	9:32 am
M10×1.25	9:31 am	9:38 am	9.44
M12×1.75	11.04	11.12	11/21
M12×1.25	11:31 am	11:38 am	11.44

6. Imperial thread drill diameter

Note	Accuracy Level
Note	G4-G6	G7-G8	G9
NO.2-56UNC	1.94	－	－
NO.3-48	2.23	－	－
NO.4-40	2.50	－	－
NO.5-40	2.83	－	－
NO.6-32	3.07	－	－
NO.8-32	3.73	3.77	－
No. 10-24	4.24	4.3	－
No. 12-24	4.90	4.96	－
1/4-20	－	5.72	－
05/16-18	－	7.24	－
8/3-16	－	8.74	8.81
07/16-14	－	10:20 am	10:30 am
1/2-13	－	11.27	11.82
NO.2-64UNF	1.97	－	－
NO.3-56	2.27	－	－
NO.4-48	2.56	－	－
NO.5-44	2.86	－	－
NO.6-40	3.16	－	－
NO.8-36	3.78	－	－
NO.10-32	4.39	4.43	－
No. 12-28	4.99	5.04	－
1/4-28	5.85	5.90	－
16/05 to 24	7.36	7.41	－
8/3-24	－	9:00 am	－
07/16-20	－	10:48 am	10.54
1/2-20	－	12.07	12.13

7. American standard fine wire and British standard electrical wire

American standard thin line
Note (UNEF)	Nominal diameter	2nd class drill size
Note (UNEF)	Nominal diameter	Max.	Minimum
NO.12-32	4.70	4,826	4,623
1/4 -32	5.60	5,690	5,486
16/05 -32	7.10	7,264	7,087
3/8 -32	8.70	8,865	8,661
07/16 -28	10:20 am	10,338	10,135
1/2 -28	11:80 am	11,938	11,709
16/09 -24	1:20 p.m.	13,386	13,132
05/08 -24	2:80 p.m.	14,986	14,732
3/4 -20	5:80 p.m.	17,958	17,678
08/07 -20	9 p.m.	21,133	20,853
1 -20	24:00	24,308	24,028

British Standard Electrical Wire
Note	Drilling diameter
2BA	4.0-4.2
3BA
4BA	3.0-3.2
5BA	2.7-2.8
6BA	2.4-2.5

8. Pipe thread

English pipe thread				English pipe thread					American pipe thread
Note	Standard diameter	Drill hole diameter		Note	Standard diameter		the minimum internal diameter of the non-threaded portion with the length of the intersecting teeth (minimum)	the minimum inner diameter of the non-threaded part with the standard (minimum) length	Note	Drill hole diameter
		Max.	Minimum		when using a threading tool	when not using a threading tool				TNP		NPS
		Max.	Minimum		when using a threading tool	when not using a threading tool				when using a threading tool	when not using a threading tool	NPS
PS 1/16 – 28	6:50 am	6,632	6,490	PT 1/16 – 28	6.10	6:20 am	6,244	6,384	01/16 – 27	6.10	6.25	6:35 am
PS 1/8 – 28	8:50 am	8,637	8,495	PT 1/8 – 28	8.10	8:20 am	8,249	8,388	1/8 – 27	8.33	8.43	8.74
PS 1/4 – 19	11:40 am	11,549	11,341	PT 1/4 – 19	10:70 am	11:00	10,962	11,174	1/4 – 18	10.72	11.13	11.13
PS 3/8 – 19	3:00 p.m.	15,054	14,846	PT 3/8 – 19	2:20 p.m.	2:50 p.m.	14,448	14,658	3/8 – 18	14.27	14.27	14.68
PS 1/2 – 14	6:50 p.m.	18,773	18,489	PT 1/2 – 14	5:60 p.m.	6:00 p.m.	17,979	18,263	1/2 – 14	5:48 p.m.	17.86	6:26 p.m.
PS 3/4 -14	24:00	24,259	23,975	PT 3/4 – 14	23:00	11:50 p.m.	23,378	23,663	3/4 – 14	22.63	23.01	23.42
PS 1 – 11	30:20	30,471	30,111	PT 1-11	29:00	29:50	29,459	29,822	1 – 11-1/2	28.58	28.98	29.36
PS 1-1/4 – 11	38.80	39,132	38,772	PT 1-1/4 – 11	37.50	38:00	37,976	38,339	1-1/4-11-1/2	37.31	37.69	38.10
PS 1-1/2 – 11	44.80	45,025	44,665	PT 1-1/2 – 11	43.40	44.00	43,869	44,232	1-1/2-11-1/2	43.66	44.04	44.45
PS 2 – 11	56.50	56,836	56,476	PT 2 – 11	54.90	55.50	55,412	55,844	2 – 11 – 1/2	55.58	55.96	56.36

9. Thread and needle for sewing machine.

Imperial thread			Metric thread		Needle carriage thread
Note (UNEF)	Drill diameter		Note	Bearing diameter	Note	Bearing diameter
Note (UNEF)	Hard material	Soft material	Note	Bearing diameter	Note	Bearing diameter
W 1/8 – 40	2.65	2.60	M3×0.5	2.63-2.60	SM1/8-40	2,735-2,688
S 32/05 – 32	3.25	3.20	M3.0×0.6	2.56-2.53	SM1/8-44	2,769-2,722
W 03/16 – 24	3.75	3.70	M3.5×0.6	3.06-3.03	SM9/64-40	3,128-3,083
W 1/4 – 20	5.10	5:00	M4.0×0.7	3.49-3.45	SM11/64-40	3,855-3,805
W 16/05 – 18	6.60	6:50 am	M4.0×0.75	3.45-3.41	SM3/16-32	4,205-4,155
W 3/8 – 16	8:00 am	7.90	M4.5×0.75	3.96-3.92	SM3/16-28	4,143-4,093
S 16/07 – 14	9:40 am	9:30 am	M5.0×0.8	4.43-4.38	SM7/32-32	5,003-4,955
W 1/2 – 12	10:70 am	10:50 am	M5.0×0.9	4.36-4.31	SM15/64-28	5,325-5,570
S 16/09 – 12	12:30 p.m.	12:00	M6.0×1.0	5:30am-5:25am	SM1/4-40	5,890-5,735
W 5/8 – 11	1:70 p.m.	1:50 p.m.	M7.0×1.0	6:30am-6:25am	SM1/4-28	5,721-5,366
W 3/4 – 10	4:70 p.m.	4:50 p.m.	M8.0×1.0	7.28-7.23	SM9/32-28	6,508-6,648
S 7/8 – 9	7:50 p.m.	7:30 p.m.	M8.0×1.25	7.12-7.07	SM11/32-28	8,092-8,432
W1 – 8	10:40 p.m.	10 p.m.			SM3/8-28	8,880-8,015
V 1-1/8 – 7	25:00	24:80			SM7/16-28	10,466-10,401
W 1 – 1/4 – 7	28:30	28:00			SM7/16-16	10,037-9,967
					SM1/2-20	11,819-11,749
					SM9/26-20	13,400-13,425

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