Micro Miniature Tapstaps & dies & guages & holders 

info  |  threads  |  taps  |   drill sizes   

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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.

 

 

Newman Tools offers thread cutting tooling in a wide range of sizes for the main two standard miniature thread series.

Unified National Miniature Thread Series

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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

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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

 

 

 

 

TAP DRILL SIZES
(inches)

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

Because these small taps are fragile, it is recommended that 75% thread be adopted only for soft materials and short threaded holes. As the length of the hole increases, the percentage of thread should be decreased. The depth of the hole to be threaded (*) as a function of the major diameter is provided in three groups and each group has a minimum and maximum for tap drill size. The minimum diameter should be used for soft and ductile materials and the maximum drill diameter for harder and more difficult materials. In many cases the hole diameter does not correspond to a numbered drill, so the closest millimeter drill should be selected.

The tap drill sizes shown for form taps are only a recommendation as a starting point. Depending on the material being tapped and the depth of the tapped hole, the hole size may have to be slightly increased or decreased to obtain good thread form and good tap life.


link to tap index page

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