Micro Tap and Die Sizes

[grsjax]

Found this info at Newman Tools website

 

The Unified National Miniature Thread Series (miniature metric thread) was accepted as a new thread series in 1958 and was intended for general-purpose use in instruments, miniature mechanisms, and for jewelry and watches. The use of this series is recommended for all new products in place of the old standard miniature and the many improvised thread sizes still in existence. We will continue to supply the ongoing demand for the old standard miniature screw threads.

The UNM thread series has fourteen miniature metric thread sizes that are systematically distributed from .30mm to 1.40mm in diameter and supplements the Unified and American Thread Series that begins at .060 inch diameter. The diameter-pitch combinations provide for maximum strength against stripping and for excellent manufacturability and interchangeability.


Technical data contained in this site is taken from Fed-Std-H28/5 and ASME B1.10M-1997.

Designation	Major Dia	Pitch mm	Approximate Threads per inch
.30 UNM	.30mm (.0118)	0.080	318
.35 UNM	.35mm (.0138)	0.090	282
.40 UNM	.40mm (.0157)	0.100	254
.45 UNM	.45mm (.0177)	0.100	254
.50 UNM	.50mm (.0197)	0.125	203
.55 UNM	.55mm (.0217)	0.125	203
.60 UNM	.60mm (.0236)	0.150	169
.70 UNM	.70mm (.0276)	0.175	145
.80 UNM	.80mm (.0315)	0.200	127
.90 UNM	.90mm (.0354)	0.225	113
1.00 UNM	1.00mm (.0394)	0.250	102
1.10 UNM	1.10mm (.0433)	0.250	102
1.20 UNM	1.20mm (.0472)	0.250	102
1.40 UNM	1.40mm (.0551)	0.300	85

 

 

Common Old Standard Miniature Instrument Threads

 

Designation	Major Dia	Threads per inch
00-90	0.047	90
00-96	0.047	96
00-112	0.047	112
000-120	0.034	120
0000-160	0.021	160

 

Miniature Taps

 

 

CUT THREADS							FORMED THREADS
THREAD SIZE	UP TO 2/3 MAJ DIA *		2/3 TO 1 1/2 MAJ DIA *		1 1/2 TO 3 MAJ DIA *
	Min	Max	Min	Max	Min	Max
1.40 UNM	0.0439	0.0455	0.0450	0.0471	0.0460	0.0481	0.0498
1.20 UNM	0.0379	0.0393	0.0388	0.0406	0.0397	0.0415	0.0438
1.10 UNM	0.0340	0.0354	0.0349	0.0367	0.0358	0.0376	0.0397
1.00 UNM	0.0300	0.0314	0.0309	0.0327	0.0319	0.0337	0.0358
0.90 UNM	0.0270	0.0283	0.0279	0.0295	0.0287	0.0304	0.0318
0.80 UNM	0.0241	0.0252	0.0248	0.0263	0.0256	0.0270	0.0283
0.70 UNM	0.0211	0.0221	0.0217	0.0231	0.0224	0.0237	0.0248
0.60 UNM	0.0181	0.0190	0.0187	0.0198	0.0193	0.0204	0.0212
0.55 UNM	0.0170	0.0178	0.0176	0.0186	0.0181	0.0191	0.0195
0.50 UNM	0.0150	0.0158	0.0156	0.0166	0.0161	0.0171
0.45 UNM	0.0141	0.0147	0.0145	0.0154	0.0149	0.0158
0.40 UNM	0.0121	0.0127	0.0125	0.0134	0.0130	0.0138
0.35 UNM	0.0105	0.0111	0.0109	0.0117	0.0113	0.0121
0.30 UNM	0.0089	0.0095	0.0093	0.0100	0.0096	0.0104
00-90	0.0358	0.0380	0.0374	0.0395	0.0385	0.0405	0.0426
00-96	0.0371	0.0385	0.0381	0.0400	0.0390	0.0409	0.0429
00-112	0.0386	0.0398	0.0394	0.0410	0.0402	0.0419	0.0435
000-120	0.0261	0.0273	0.0270	0.0280	0.0277	0.0293	0.0306
0000-160	0.0151	0.0160	0.0157	0.0170	0.0164	0.0176	0.0184

 

 

Edited April 14, 2019 by grsjax

[JerryTodd]

Are there left-handed micro taps and dies available - I have some turnbuckles to make.

[druxey]

Yes, I've seen left handed ones online, but they are extremely expensive.

[JerryTodd]

I've been looking, but haven't found any at all under 3/16"
Maybe I can sell some left handed screw eyes to pay for it, if I find some. 

 

Edited September 26, 2022 by JerryTodd

[druxey]

Check:

 

https://minitaps.com/brands/MiniTaps.html