Miniature Screws

Unified Miniature Screw Threads: The use of this UNM (metric) series is recommended for new products although the old standards are still available. You can check Newman Tools Inc. for a brief history and more information. Check JI Morris Inc. for dimensional information. (Reference ASME B1.10M-2004, Unified Miniature Screw Threads.)

NAS721.......Screw, Miniature, Fillister Head (.30 UNM to 1.4 UNM)
NAS722.......Screw, Miniature, Pan Head (.30 UNM to 1.4 UNM)
NAS723.......Screw, Miniature, 100 Degree, Flat Head (.30 UNM to 1.4 UNM)
NAS724.......Screw, Miniature, Binding Head (.40 UNM to 1.4 UNM)
Tap Drill Sizes

Unified and American Thread Series:

Common Old Standard Miniature Instrument Threads. The table below was constructed from information extracted from the website of JI Morris Co and Small Parts Inc. An attempt was made to show only cres hardware. If you see brass and want cres, contact the companies listed. It may not be available. (Reference ASME B18.6.3-2003, Machine Screws and Machine Screw Nuts.)
NAS1640.......Washer, Lock, Spring, Non-magnetic [#0 (.060) through 1-1/2]
Tap Drill Sizes

Hex Head Screws						Vendor
Screw Size	Material	O.D.	Across Flats-A	Head Height-H	Lengths	jimorris
#0-80	Brass	.0566-.0600	.0937+/-.002	.038-.046	.094 to .500
#00-90	Brass	.0450-.0470	0.0781+/-.002	.038-.046	.094 to .500
Round Head Slotted Screws
Screw Size	Material	O.D.	Diameter-A	Head Height-H	Lengths
#0-80	Brass	.0566-.0600	.104-.110	.045-.051	.094 to .500
#00-90	Brass	.0450-.0470	.083-.089	.039-.045	.094 to .500
#000-120	Brass	.0325-.0340	.058-.062	.027-.032	.094 to .250
Flat Head 82 Degree Slotted Screws
Screw Size	Material	O.D.	Diameter-A	Head Height-H	Lengths
#0-80	Cres	.0566-.0600	.104-.112	0.035 REF	.094 to .250
#00-90	Cres	.0450-.0470	.085-.093	0.028 REF	.094 to .250
#000-120	Cres	.0325-.0340	.058-.064	0.016 REF	.094 to .250
#0000-160	Cres	.0195-.0210	.037-.043	.011 REF	.062 to .156
Oval Fillister Head Slotted Screws
Screw Size	Material	O.D.	Diameter-A	Head Height-O	Lengths
#0-80	Cres	.0566-.0600	.087-.095	.047-.055	.094 to .250
#00-90	Cres	.0450-.0470	.074-.082	.039-.047	.094 to .250
#000-120	Cres	.0325-.0340	.053-.059	.027-.035	.094 to .250
#0000-160	Cres	.0195-.0210	.032-.038	.015-.023	.062 to .156
Hex Nuts
Screw Size	Material	O.D.	Across Flats-A	Head Height-H
#1-72	Cres	0.073	.1093+/-.002	.059-.069
#0-80	Cres	.0566-.0600	.0937+/-.002	.044-.052
#00-90	Cres	.0450-.0470	.0781+/-.002	.036-.044
#000-120	Brass	.0325-.0340	.0781+/-.002	.030-.036
#0000-160	Brass	0.021	0.0625	.022-.028
Flat Washers
Screw Size	Material	O.D.	I.D	Thk
#1 (.073)	Brass/Cres	0.1560	.075"	0.019
#0 (.060)	Brass/Cres	0.1250	.064"	0.019
#00 (.047)	Brass/Cres	0.1094	.050"	0.015
#000(.034)	Brass/Cres	0.0781	.037"	0.012
Lock Washers						small parts similar to NAS1640
Screw Size	Material	O.D.	I.D	Thk
#1(.073)	Cres	0.15	0.075	0.022	see note 1)
#0(.060)	Cres	0.130	0.063	0.016	see note 2)

1) Appears to no longer be available, (taken from catalog 21, 2001). Consult the manufacturer. 2) DIN 127 3.3mm O.D. x 1.6mm I.D. x .4mm thk.

Miniature Screws

Unified and American Thread Series: