Screw Thread, Tools, and Other Design Numbers (English)
Nominal Size (in)		TPI (N)	At (in2)	Ar (in2)	WS (in)	OEC (in)	BWC (in)	SWC (in)	HK (in)
0	0.0600	80	0.00180	0.00151					0.050
1/16 (1)	0.0730	72	0.00278	0.00237					1/16
		64	0.00263	0.00218
5/64 (2)	0.0860	64	0.00394	0.00339					5/64
		56	0.00370	0.00310
3/32 (3)	0.0990	56	0.00523	0.00451					5/64
		48	0.00487	0.00406
7/64 (4)	0.1120	48	0.00661	0.00566					3/32
		40	0.00604	0.00496
1/8 (5)	0.1250	44	0.00880	0.00716					3/32
		40	0.00796	0.00672
9/64 (6)	0.1380	40	0.01015	0.00874	1/4	0.60	0.48	0.50	7/64
		32	0.00909	0.00745
5/32 (8)	0.1640	36	0.01474	0.01285	1/4	0.60	0.48	0.50	9/64
		32	0.01400	0.01196
3/16 (10)	0.1900	32	0.02000	0.01750	5/16	0.80	0.58	0.50	5/32
		24	0.01750	0.01450
7/32 (12)	0.2160	28	0.02580	0.02260	5/16	0.80	0.58	0.50
		24	0.02420	0.02060
1/4 (14)	0.2500	28	0.03640	0.03260	7/16	1.00	0.780	0.66	3/16
		20	0.03180	0.02690	3/8	0.90	0.724
5/16 (20)	0.3125	24	0.05800	0.05240	1/2	1.20	0.83	0.75	1/4
		18	0.05240	0.04540
3/8 (24)	0.3758	24	0.08780	0.08090	9/16	1.40	0.93	0.78	5/16
		16	0.07750	0.06780
7/16	0.4375	20	0.11870	0.10900	5/8	1.40	1.00	0.96	3/8
		14	0.10630	0.09330	11/16	1.53	1.08
1/2	0.5000	20	0.15990	0.14860	3/4	1.70	1.20	1.01	3/8
		13	0.14190	0.12570	7/8	1.90	1.35
9/16	0.5625	18	0.20300	0.18900	13/16	1.82	1.40	1.17
		12	0.18200	0.16200	7/8	1.94	1.44
5/8	0.6250	18	0.25600	0.24000	15/16	1.5300	2.120	1.27	1/2
		11	0.22600	0.20200	1-1/16
3/4	0.7500	16	0.37300	0.35100	1-1/8	1.784	2.54		5/8
		10	0.33400	0.30200	1-1/4
7/8	0.8750	14	0.50900	0.48000	1-5/16	2.124	3.040		3/4
		9	0.46200	0.41900	1-7/16	2.288
1	1.0000	12	0.66300	0.62500	1-1/2	2.456	3.180		3/4
		8	0.60600	0.55100	1-5/8	2.702
Use anti-seize substances to help avoid cross-threading the bolt. Use your fingers to wiggle the bolt as you drive it into the hole, this help align the threads and make for a smooth installation. Threaded holes in new parts could be defective due to worn out tapping tools, re-tapping might be necessary. If the finished part shows thread call out mistakes in a drawing could be fixed by installing a threaded insert. Make sure to correct the drawing to avoid repeating the mistake later on. Chrislynn Inserts has an adequate line of Helicoil products including those with breakable tabs for Delrin. Dodge Helicoil has a large variety of helicoil insert products. To prevent loosening due to vibration use thread-locking substances such as Loctite® 242 (Medium), 262, 271 (High), etc.
Screw Thread, Tools, and Other Design Numbers (Metric)
Nominal Size (mm)		Pitch (mm)	At (mm2)	Ar (mm2)	WS (mm)	OEC (mm)	BWC (mm)	SWC (mm)	HK (mm)
M1.6	1.6	0.35	1.27	1.07	3.2				1.5
M2	2	0.40	2.07	1.79	4				1.5
M2.5	2.5	0.45	3.39	2.98	5				2
M3	3	0.50	5.03	4.47	5.5				2.5
M4	4	0.70	8.78	4.47	7	17	12	12	3
M5	5	0.80	14.2	12.70	8	19	19	12	4
M6	6	1.00	20.1	17.9	10	25	25	15	5
M7	7	1.00			11	25	19	16
M8	8	1.00	39.2	36.0	12, 13	30	28	19	6
		1.25	36.6	32.80
M10	10	1.25	61.2	56.3	14, 16, 17	40	38	24	8
		1.50	58.0	52.3
M12	12	1.25	92.10	86.00	17, 18, 19	42	30	26.5	10
		1.75	84.3	76.30
M14	14	1.50	125.0	116.0	19, 21, 22	47	35	30	12
		2.00	115.0	104.0
M16	16	1.50	167.0	157.0	22, 24, 27	56	43		14
		2.00	157.0	144.0
M18	18	1.50			27	56	43
		2.50
M20	20	1.50	272.0	259.0	30	56	43		17
		2.50	245.0	225.0
M24	24	2.00	384.0	365.0	36	72	53		19
		3.0	353.0	324.0
M30	30	2.00	621.0	596.0	46	103	78		22
		3.5	561.0	519.0
M36	36	2.00	915.0	884.0	55				27
		4.0	817.0	759.0
ANSI B1.1-1974, B107.100

NUMBER CAP SCREWS
Screw Size	Decimal Equiv.	Hex Key	Screw Head		Counterbore		Countersink Diam, in, 60° (C)	Clearance Drills (D)
			Diam, in	Height, in	Diam, in (A)	Depth, in (B)		Norm. Fit	Close Fit
No. 0	0.060	0.050	0.096	0.060	1/8	0.060	0.074	#49	#51
No. 1	0.073	1/16	0.118	0.073	5/32	0.073	0.087	#43	#46
No. 2	0.086	5/64	0.140	0.086	3/16	0.086	0.102	#36	3/32"
No. 3	0.099	5/64	0.161	0.099	7/32	0.099	0.115	#31	#36
No. 4	0.112	3/32	0.183	0.112	7/32	0.112	0.130	#29	1/8"
No. 5	0.125	3/32	0.205	0.125	1/4	0.125	0.145	#23	9/64"
No. 6	0.138	7/64	0.226	0.138	9/32	0.138	0.158	#18	#23
No. 8	0.164	9/64	0.270	0.164	5/16	0.164	0.188	#10	#15
No. 10	0.190	5/32	0.312	0.190	3/8	0.190	0.218	#2	#5
No. 12	0.216	5/32	0.345	0.216	13/32	0.216		1/4"	15/64"

FRACTIONAL CAP SCREWS
Screw Size	Decimal Equiv.	Hex Key	Screw Head		Counterbore		Countersink Diam, in, 60° (C)	Clearance Drills (D)
			Diam, in	Height, in	Diam, in (A)	Depth, in (B)		Norm. Fit	Close Fit
1/4"	0.250	3/16	0.375	0.250	7/16	0.250	0.278	9/32"	17/64"
5/16"	0.313	1/4	0.469	0.313	17/32	0.313	0.346	11/32"	21/64"
3/8"	0.375	5/16	0.563	0.375	5/8	0.375	0.415	13/32"	25/64"
7/16"	0.438	3/8	0.656	0.438	23/32	0.438	0.483	15/32"	29/64"
1/2"	0.500	3/8	0.750	0.500	13/16	0.500	0.552	17/32"	33/64"
9/16"	0.563	7/16	0.844	0.563	29/32	0.563		39/64"	37/64"
5/8"	0.625	1/2	0.938	0.625	1	0.625	0.689	21/32"	41/64"
3/4"	0.750	5/8	1.125	0.750	1-3/16	0.750	0.828	25/32"	49/64"
7/8"	0.875	3/4	1.313	0.875	1-3/8	0.875	0.963	29/32"	57/64"
1"	1.000	3/4	1.500	1.000	1-5/8	1.000	1.100	1-1/32"	1-1/64"
1-1/8"	1.125	7/8	1.688	1.125	1-13/16	1.125		1-11/64"	#26
1-1/4"	1.250	7/8	1.875	1.250	2	1.250	1.370	1-5/16"	1-9/32"
1-1/2"	1.500	1	2.250	1.500	2-3/8	1.500	1.640	1-9/16"	1-17/32"
1-3/4"	1.750	1-1/4	2.625	1.750	2-3/4	1.750	1.910	1-13/16"	1-25/32"
2"	2.000	1-1/2	3.000	2.000	3-1/8	2.000	2.180	2-1/16"	2-1/32"

METRIC CAP SCREWS
Screw Size	Decimal Equiv.	Hex Key	Screw Head		Counterbore		Countersink Diam, mm, 60° (C)	Clearance Drills (D)
			Diam, mm	Height, mm	Diam, mm (A)	Depth, mm (B)		Norm. Fit	Close Fit
M1.6	0.062	1.5	3.0	1.6	3.50	1.6	2.0	1.95	1.80
M2	0.078	1.5	3.8	2.0	4.40	2.0	2.6	2.40	2.20
M2.5	0.098	2	4.5	2.5	5.40	2.5	3.1	3.00	2.70
M2.6	0.102	2	5.0	2.6	6.00	2.6		3.20	3.00
M3	0.118	2.5	5.5	3.0	6.50	3.0	3.6	3.70	3.40
M4	0.157	3	7.0	4.0	8.25	4.0	4.7	4.80	4.40
M5	0.196	4	8.5	5.0	9.75	5.0	5.7	5.80	5.40
M6	0.236	5	10.0	6.0	11.20	6.0	6.8	6.80	6.40
M8	0.315	6	13.0	8.0	14.50	8.0	9.2	8.80	8.40
M10	0.393	8	16.0	10.0	17.50	10.0	11.2	10.80	10.50
M12	0.472	10	18.0	12.0	19.50	12.0	14.2	13.00	12.50
M14	0.551	12	21.0	14.0	22.50	14.0	16.2	15.00	14.50
M16	0.629	14	24.0	16.0	25.50	16.0	18.2	17.00	16.50
M18	0.708	14	27.0	18.0	28.50	18.0		19.00	18.50
M20	0.787	17	30.0	20.0	31.50	20.0	22.4	21.00	20.50
M24	0.944	19	36.0	24.0	37.50	24.0	26.4	25.00	24.50
M30	1.181	22	45.0	30.0	47.50	30.0	33.4	31.50	31.00
M36	1.417	27	54.0	36.0	56.50	36.0	39.4	37.50	37.00
M42	1.653		63.0	42.0	66.00	42.0	45.6	44.00	43.00
M48	1.889		72.0	48.0	75.00	48.0	52.6	50.00	49.00

Shoulder Diameter (A)	Thread (C)	Thread Length (D)	Head Diameter (E)	Head Height (F)	Allen Wrench Size
6mm	5mm x 0.8	9.75	10	4.5	3
8mm	6mm x 1.0	11.25	13	5.5	4
10mm	8mm x 1.25	13.25	16	7	5
12mm	10mm x 1.5	16.4	18	9	6
16mm	12mm x 1.75	18.4	24	11	8
20mm	16mm x 2.0	22.4	30	14	10

Shoulder Diameter (A)	Thread (C)	Thread Length (D)	Head Diameter (E)	Head Height (F)	Allen Wrench Size
1/8	4-40	3/32	1/4	1/8	5/64
3/16	8-32	3/16	5/16	5/32	3/32
1/4	10-24	3/8	3/8	3/16	1/8
5/16	1/4-20	7/16	7/16	7/32	5/32
3/8	5/16-18	1/2	9/16	1/4	3/16
1/2	3/8-16	5/8	3/4	5/16	1/4
5/8	1/2-13	3/4	7/8	3/8	5/16
3/4	5/8-11	7/8	1	1/2	3/8
1	3/4-10	1	1-5/16	5/8	1/2
1-1/4	7/8-9	1-1/8	1-3/4	3/4	5/8

ACME EXTERNAL THREAD DIMENSIONS
Designation	A	B	Pitch	Minor Dia.	Pitch Dia.	Major Dia.
1/4"-16	0.02317	0.03125	0.06250	0.17750	0.21630	0.25000
1/2"-10	0.03707	0.05000	0.10000	0.38000	0.44430	0.50000
3/4"-5	0.07414	0.10000	0.20000	0.56330	0.65980	0.75000
1"-5	0.07414	0.10000	0.20000	0.78000	0.90000	1.00000
ACME INTERNAL THREAD DIMENSIONS
Designation	A	B	Pitch	Minor Dia.	Pitch Dia.	Major Dia.
1/4"-16	0.02317	0.03125	0.06250	0.18000	0.22000	0.27000
1/2"-10	0.03707	0.05000	0.10000	0.40000	0.45000	0.52000
3/4"-5	0.07414	0.10000	0.20000	0.58330	0.66670	0.77000
1"-5	0.07414	0.10000	0.20000	0.80000	0.90000	1.02000

FRAME	A	Bolt Circle (AJ)	Holes (TAP)	Diameter (AK)	Shaft Dia. (U)	Shaft Lg. (V)	Keyway (S)	Keyway (R)
NEMA 8	0.630	0.891	M2	0.5906	0.1575	0.53
NEMA 11	0.906	1.281	M2.5	0.866	0.1968	0.394
NEMA 14	1.024	1.447	M3	0.866	0.1968	0.826
NEMA 17	1.221	1.726	M3	0.866	0.1968	0.860
IEC 63 B14	--	75	M5	60	11	20.5	4	8.5
NEMA 23	1.856	2.625	5.0	1.5	0.2500	0.764
IEC 71 B14	--	85	M6	70	14	27.5	5	11
NEMA 34	2.740	3.875	6.5	2.874	0.3748	1.394	FLAT
IEC 80 B14	--	100	M6	80	19	37	6	15.5
NEMA 42	3.504	4.955	1/4-20	2.186	0.7480	2.120	0.1875	0.6425
IEC 90S,L B14	--	115	M8	95	24	47	8	20
NEMA 48	4.8	3.75	1/4-20	3	0.500	1.500	FLAT	0.4531
IEC 100 B14	--	130	M8	110	28	60
NEMA 56S,H	5.6	5.875	3/8-16	4.5	0.625	1.875	0.1875	0.5156
NEMA 143T	14.3	5.875	3/8-16	4.5	0.875	2.25	0.1875	0.7656