Thread sizes

Size ¹	DIA [in] ²	DIA [mm] ³	Coarse Pitch	Fine Pitch
M0.5	0.0197	0.50	0.13	N/A
#0000	0.0210	0.53	160 TPI	N/A
M0.8	0.0315	0.80	0.20	N/A
#000	0.0340	0.86	120 TPI	N/A
M0.9	0.0354	0.90	0.23	N/A
M1	0.0394	1.00	0.25	N/A
#00	0.0470	1.19	90 TPI	N/A
M1.2	0.0472	1.20	0.25	N/A
M1.4	0.0551	1.40	0.30	N/A
#0	0.0600	1.52	80 TPI	N/A
M1.6	0.0630	1.60	0.35	N/A
M1.7	0.0669	1.70	0.35	N/A
M1.8	0.0709	1.80	0.35	N/A
#1	0.0730	1.85	72 TPI	N/A
M2	0.0787	2.00	0.40	0.25
#2	0.0860	2.18	64 TPI	N/A
M2.5	0.0984	2.50	0.45	0.35
#3	0.0990	2.51	48 TPI	N/A
#4	0.1120	2.84	40 TPI	48 TPI
M3	0.1181	3.00	0.50	0.35
#5	0.1250	3.18	40 TPI	44 TPI
M3.5	0.1378	3.50	0.60	0.35
#6	0.1380	3.51	32 TPI	40 TPI
M4	0.1575	4.00	0.70	0.50
#8	0.1640	4.17	32 TPI	36 TPI
#10	0.1900	4.83	24 TPI	32 TPI
M5	0.1969	5.00	0.80	0.50
M6	0.2362	6.00	1.00	0.75
1/4	0.2500	6.35	20 TPI	28 TPI
M7	0.2756	7.00	1.00	0.75
5/16	0.3125	7.94	18 TPI	24 TPI
M8	0.3150	8.00	1.25	1.00
3/8	0.3750	9.53	16 TPI	24 TPI
M10	0.3937	10.00	1.50	1.25
7/16	0.4375	11.11	14 TPI	20 TPI
M12	0.4724	12.00	1.75	1.25
1/2	0.5000	12.70	13 TPI	20 TPI
M14	0.5512	14.00	2.00	1.50
5/8	0.6250	15.88	11 TPI	18 TPI
M16	0.6299	16.00	2.00	1.50
3/4	0.7500	19.05	10 TPI	16 TPI
M20	0.7874	20.00	2.50	1.50
M22	0.8661	22.00	2.50	1.50
7/8	0.8750	22.23	9 TPI	14 TPI
M24	0.9449	24.00	3.00	2.00
1	1.0000	25.40	8 TPI	12 TPI
M27	1.0630	27.00	3.00	2.00
1 1/8	1.1250	28.58	7 TPI	12 TPI
M30	1.1811	30.00	3.50	2.00
1 1/4	1.2500	31.75	7 TPI	12 TPI
M33	1.2992	33.00	3.50	2.00
UNO ⁴	1.2992	33.00	1.50	N/A
1 3/8	1.3750	34.93	6 TPI	12 TPI
M36	1.4173	36.00	4.00	3.00
1 1/2	1.5000	38.10	6 TPI	12 TPI
M42	1.6535	42.00	4.50	N/A
1 3/4	1.7500	44.45	5 TPI	N/A
M48	1.8898	48.00	5.00	N/A
2	2.0000	50.80	4.5 TPI	N/A
M56	2.2047	56.00	5.00	N/A
2 1/4	2.2500	57.15	4.5 TPI	N/A
2 1/2	2.5000	63.50	4 TPI	N/A
M64	2.5197	64.00	6.00	N/A
2 3/4	2.7500	69.85	4 TPI	N/A
M72	2.8346	72.00	6.00	N/A
3	3.0000	76.20	4 TPI	N/A
M80	3.1496	80.00	6.00	N/A
3 1/4	3.2500	82.55	4 TPI	N/A
3 1/2	3.5000	88.90	4 TPI	N/A
M90	3.5433	90.00	6.00	N/A
3 3/4	3.7500	95.25	4 TPI	N/A
M100	3.9370	100.00	6.00	N/A
4	4.0000	101.60	4 TPI	N/A

Oberg, Jones, Horton, Ryffel, McCauley. (2020). Machinery’s Handbook 31 Digital Edition. https://ebooks.industrialpress.com/pdfreader/machinerys-handbook-digital-edition-31st ↩
Dimensions per ASME B1.1-2003 (R2018) in inches. ↩
Dimensions per ASME B1.13M-2005 (R2015) in millimeters. ↩
Thread commonly used for lamp shade fixtures and is equivalent to M33X1.5. ↩

Thread sizes

Footnotes