Thread Information

• download thread info pdf

UNIFIED MINIATURE SCREW THREADS

MINIATURE SCREWS

(All dimensions in inches)**

Fillister Head
Size Designation	Preferred*	.30UNM		.40UNM		.50UNM		.60UNM
			.35UNM		.45UNM		.55UNM
Head Diameter - A	Max. Min.	0.021 0.019	0.023 0..021	0.025 0.023	0.029 0.027	0.033 0.031	0.037 0.035	0.041 0.039
Head Height - H	Max. Min.	0.012 0.010	0.014 0.012	0.016 0.013	0.018 0.015	0.020 0.017	0.022 0.019	0.025 0.021
Slot Width - J	Max. Min.	0.004 0.003	0.004 0.003	0.005 0.003	0.005 0.003	0.006 0.004	0.006 0.004	0.008 0.005
Slot Depth - T(a)	Max Min.	0.006 0.004	0.007 0.005	0.008 0.006	0.009 0.007	0.010 0.007	0.011 0.008	0.012 0.009
Chamfer - C	Max.	0.002	0.002	0.002	0.002	0.003	0.003	0.004
Radius - R(b)	Max.	0.002	0.002	0.002	0.002	0.002	0.002	0.003

Size Designation	Preferred*		.80UNM		1.00UNM		1.20UNM
		.70UNM		.90UNM		1.10UNM		1.40UNM
Head Diameter - A	Max. Min.	0.045 0.043	0.051 0.049	0.056 0.054	0.062 0.058	0.072 0.068	0.082 0.078	0.092 0.088
Head Height - H	Max. Min.	0.028 0.024	0.032 0.028	0.036 0.032	0.040 0.035	0.045 0.040	0.050 0.045	0.055 0.050
Slot Width - J	Max. Min.	0.008 0.005	0.010 0.007	0.010 0.007	0.012 0.008	0.012 0.008	0.016 0.012	0.016 0.012
Slot Depth - T(a)	Max Min.	0.014 0.011	0.016 0.012	0.020 0.016	0.020 0.016	0.022 0.018	0.025 0.020	0.028 0.023
Chamfer - C	Max.	0.004	0.005	0.005	0.006	0.006	0.008	0.008
Radius - R(b)	Max.	0.003	0.004	0.004	0.005	00.005	00.006	0.006

 

Pan Head
Size Designation	Preferred*	.30UNM		.40UNM		.50UNM		.60UNM
			.35UNM		.45UNM		.55UNM
Head Diameter - A	Max. Min.	0.025 0.023	0.029 0.027	0.033 0.031	0.037 0.035	0.041 0.039	0.045 0.043	0.051 0.049
Head Height - H	Max. Min.	0.010 0.008	0.011 0.009	0.012 0.010	0.014 0.012	0.016 0.013	0.018 0.015	0.020 0.017
Slot Width - J	Max. Min.	0.005 0.003	0.005 0.003	0.006 0.004	0.006 0.004	0.008 0.005	0.008 0.005	0.010 0.007
Slot Depth - T(a)	Max Min.	0.005 0.003	0.006 0.004	0.006 0.004	0.007 0.005	0.008 0.006	0.009 0.007	0.010 0.007
Chamfer - C	Max.	0.002	0.002	0.002	0.002	0.003	0.003	0.004
Radius - R(b)	Max.	0.002	0.002	0.002	0.002	0.002	0.002	0.003

Size Designation	Preferred*		.80UNM		1.00UNM		1.20UNM
		.70UNM		.90UNM		1.10UNM		1.40UNM
Head Diameter - A	Max. Min.	0.056 0.054	0.062 0.058	0.072 0.068	0.082 0.088	0.092 0.088	0.103 0.097	0.113 0.107
Head Height - H	Max. Min.	0.022 0.019	0.025 0.021	0.028 0.024	0.032 0.028	0.036 0.032	0.040 0.035	0.045 0.040
Slot Width - J	Max. Min.	0.010 0.007	0.012 0.008	0.012 0.008	0.016 0.012	0.016 0.012	0.020 0.015	0.020 0.015
Slot Depth - T(a)	Max Min.	0.011 0.008	0.012 0.009	0.014 0.011	0.018 0.014	0.018 0.014	0.020 0.016	0.022 0.018
Chamfer - C	Max.	0.004	0.005	0.005	0.006	0.006	0.008	0.008
Radius - R(b)	Max.	0.003	0.004	0.004	0.005	00.005	00.006	0.006

 

Flat Head (100 DSEG.)
Size Designation	Preferred*	.30UNM		.40UNM		.50UNM		.60UNM
			.35UNM		.45UNM		.55UNM
Head Diameter - A	Max. Min.	0.023 0.021	0.025 0.023	0.029 0.027	0.033 0.031	0.037 0.035	0.041 0.039	0.045 0.043
AV. DIA. at MAX - H		0.0285	0.0305	0.0348	0.0392	0.0459	0.0503	0.0546
Head Height - H	Max. Min.	0.007 0.005	0.007 0.005	0.008 0.006	0.009 0.007	0.011 0.008	0.012 0.009	0.013 0.010
Slot Width - J	Max. Min.	0.004 0.003	0.004 0.003	0.005 0.003	0.005 0.003	0.006 0.004	0.006 0.004	0.008 0.005
Slot Depth - T	Max. Min.	0.004 0.002	0.004 0.002	0.005 0.003	0.005 0.003	0.006 0.004	0.006 0.004	0.008 0.005
Radius - R(b)	Max.	0.005	0.005	0.006	0.006	0.008	0.008	0.010

Size Designation	Preferred*		.80UNM		1.00UNM		1.20UNM
		.70UNM		.90UNM		1.10UNM		1.40UNM
Head Diameter - A	Max. Min.	0.051 0.049	0.056 0.054	0.062 0.058	0.072 0.068	0.082 0.078	0.092 0.088	0.0103 0.097
AV. DIA. at MAX - H		0.0610	0.0696	0.0759	0.0847	0.0957	0.1068	0.1197
Head Height - H	Max. Min.	0.014 0.011	0.016 0.012	0.017 0.013	0.019 0.015	0.022 0.018	0.025 0.020	0.027 0.022
Slot Width - J	Max. Min.	0.008 0.005	0.010 0.007	0.010 0.007	0.012 0.008	0.012 0.008	0.016 0.012	0.016 0.012
Slot Depth - T	Max. Min.	0.008 0.005	0.010 0.006	0.010 0.006	0.012 0.008	0.012 0.008	0.016 0.010	0.016 0.010
Radius - R(b)	Max.	0.010	0.012	0.012	0.016	0.016	0.020	0.020

* It is recommended that selections be confined to preferred sizes insofar as possible.
** ASA Standard Be.10-1958 also lists metric equivelents which are interchangeable is assembly with inches.
(a) Slot Depth "T" measured from bearing surface.
(b) Radius "R" relative to max. major dia.
There is no standard for nuts available or under consideration at the present time.

STANDARD LENGTHS^(c)

Length	(In.)	(d).30UNM*	.35UNM*	.40UNM	.45UNM	.50UNM	.55UNM	.60UNM	.70UNM	.80UNM	.90UNM	1.00UNM	1.10UNM	1.20UNM	1.40UNM
Max.	Min.	(e) (0.0118)	(0.0138)	(0.0157)	(0.0177)	(0.0197)	(0.0217)	(0.0236)	(0.0276)	(0.0315)	(0.0354)	(0.0394)	(0.0433)	(0.0472)	(0.0551)
0.020	0.016	30-020
0.025	0.021	30-025	35-025	40-025
0.032	0.027	30-032	35-032	40-032	45-032	50-032
0.040	0.035	30-040	35-040	40-040	45-040	50-040	55-040	60-040
0.050	0.044	30-050	35-050	40-050	45-050	50-050	55-050	60-050	70-050	80-050
0.060	0.054	30-060	35-060	40-060	45-060	50-060	55-060	60-060	70-060	80-060	90-060	100-060
0.080	0.072	30-080	35-080	40-080	45-080	50-080	55-080	60-080	70-080	80-080	90-080	100-080	110-080	120-080
0.100	0.092	30-100	35-100	40-100	45-100	50-100	55-100	60-100	70-100	80-100	90-100	100-100	110-100	120-100	140-100
0.120	0.110	30-120	35-120	40-120	45-120	50-120	55-120	60-120	70-120	80-120	90-120	100-120	110-120	120-120	140-120
0.160	0.150	30-160	35-160	40-160	45-160	50-160	55-160	60-160	70-160	80-160	90-160	100-160	110-160	120-160	140-160
0.200	0.188		35-200	40-200	45-200	50-200	55-200	60-200	70-200	80-200	90-200	100-200	110-200	120-200	140-200
0.250	0.238				45-250	50-250	55-250	60-250	70-250	80-250	90-250	100-250	110-250	120-250	140-250
0.320	0.304						55-320	60-320	70-320	80-320	90-320	100-320	110-320	120-320	140-320
0.400	0.384								70-400	80-400	90-400	100-400	110-400	120-400	140-400
0.500	0.480										90-500	100-500	110-500	120-500	140-500
0.600	0.580												110-600	120-600	140-600

(c) Bold face type indicates preferred sizes. (d) Size Designation (e) Basic Major Diam.
Standard lengths in all sizes are available in Fillister, Pan 100° Flat and Binding Heads with the following exceptions:
*BINDING HEADS HAVE NO STANDARD LENGTHS IN 30 LAND 35 UNM

Mauve Shading Figures in this area are standard only for Fillister, Pan and Binding (except 30 & 35 UNM Binding) Heads. Not standard for 100° Flat.

GREEN FIGURES (30-160, etc.) Standard for 100° Flat Head only.

Above lengths are considered standard only and do not imply stock availability from J.I. Morris Co.

MINIATURE NUMBER BASIC THREAD DATA

SIZE	THREADS PER INCH	PITCH	HELIX ANGLE	THREAD DEPTH	O.D.	P.D	M.D
0000-160	160	.00625"	6° 43"	.00406"	.0210"	.0169"	.0128"
000-120	120	.00833"	5° 18"	.00541"	.0340"	.0286"	.0232"
00-90	90	.01111"	5° 5"	.00722"	.0470"	.0398"	.0326"
0-80	80	.01250"	4° 23"	.00812"	.0600"	.0159"	.0438"
1-72	72	.01389"	3° 57"	.00902"	.0730"	.0640"	.0550"
2-56	56	.01786"	4° 22"	.01160"	.0860"	.0744"	.0628"

MINIATURE NUMBER SCREWS AND NUTS THREAD LIMITS

NOTE: Minor dia. of nuts is omitted as it is determine by the thread percentage required

MINIATURE NUMBER TAP DRILL SIZES

SIZE	THREAD PERCENTAGE AND TAP DRILL SIZE/ALTERNATE
	50%	55%	60%	65%	Clearance Drill
0000-160	.42MM/---	.41MM/#78	.40MM/#78	.39MM/1/64"	#73
000-120	.72MM/#70	.70MM/#70	.69MM/#71	.68MM/---	#63
00-90	1.00MM/----	.98MM/#61	#62/---	.95MM/#63	1.25MM
0-80	1.31MM/----	1.29MM/----	1.27MM/----	1.25MM/----	#52
1-72	#52/----	1/16"/----	1.57MM/----	1.5MM/----	#48
2-56	1.88MM/----	#49MM/----	1.82MM/----	1.79MM/#50	#43
Tap Drill Hole Size Calculation (use smaller Num/Frac/Metric drill closest to result)
Hole Size = Basic O.D. - (2x Thread Depth x Thread % Required)

HEAD DIMENSIONS OF MINIATURE NUMBER SELF TAPPING SCREWS (TYPE BP)

NUMBERING SYSTEM FOR MINIATURE SCREWS, NUTS AND WASHERS

A convenient numbering system containing all information for telephone, fax, email, orders and correspondence.

1. H = Hex  R = Round  F = Flat  FF = Flat Fillister  P = Oval Fillister  N = Hex Nuts  W = Round Flat Washers

2. B = Brass  CE = #303 Stainless Steel, passivated  CK = #416 Stainless Steel, Heat Treated, passivated

3. NP = Bright Nickel  AG = Silver Matt Finish  AB = Silver Bright Finish  AU = Yellow Gold  SN = Tin Matt Finish  SB = Tin Bright Finish

* On Self Tapping Screws Threads Per Inch omitted (e.g. 00-90 machine screw- 0090, 00 Self Tapping Screws- 00) TPI also ommitted on washers

** Length ommitted on nuts and washers

MATERIAL SPECIFICATIONS

FLAT/CORNER DIMENSIONS (HEX/SQUARE)

Flat Dimensions
3/64 .0469	1/16 .0625	5/64 .0781	3/32 .0938	7/64 .1094	1/8 .1250	9/64 .1406	5/32 .1563	3/16 .1875	1/4 .2500
Hex Corner Dimensions (1.1547 x Flat Dimension)
.0542	.0722	.0902	.1083	.1263	.1443	.1624	.1805	.2165	.2887
Square Corner Dimensions (1.4142 x Flat Dimension)
.0663	.0884	.1104	.1327	.1547	.1768	.1988	.2210	.2652	.3536

HEAD DIMENSIONS OF MINIATURE NUMBER SCREWS AND NUTS

HEAD Size     00-112       HEAD Size     00-96   1-64 2-64 HEAD Size 0000-160 000-120 00-90 0-80 1-72 2-56 HEAD Body dia. (D) .021 .034 .047 .060 .073 .086 HEX Hd. Dia. (across flats (A) 3/64" 5/64" 5/64" 3/32" 7/64" 1/8" HEX Head Height (H) .025 .033 .042 .042 .055 .064 ROUND Head Dia. (A) .038 .059 .085 .106 .130 .154 ROUND Head Height (H) .019 .028 .041 .047 .055 .065 ROUND Slot Width .006 .010 .013 .019 .022 .028 ROUND Slot Depth .010 .015 .022 .032 .037 .042 FLAT Head Dia. (A) .040 .061 .089 .108 .136 .164 FLAT Head Height (H) (normal) .011 .016 .024 .035 .043 .051 FLAT Slot Width .006 .009 .013 .019 .022 .028 FLAT Slot Depth .005 .007 .010 .013 .016 .019 OVAL FILL Head Dia. (A) .035 .056 .078 .091 .111 .132 OVAL FILL Head height FE .019 .031 .043 .051 .062 .073 OVAL FILL Slot Width .006 .009 .013 .019 .022 .027 OVAL FILL Slot Depth .009 .014 .019 .022 .025 .029 NUT Across Flats (A) 3/64" 5/64" 5/64" 3/32" 7/64" 1/8" NUT Thickness (H) .025 .033 .040 .048 .063 .075

MORRIS MANUFACTURING SPECIFICATIONS

THREADS: Complete within two from head unless otherwise specified. Any unthreaded body to be no smaller than minimum pitch diameter or larger than maximum major diameter of thread.

CHAMFER: 45° x 1/2-1 thread on end of threads (may not be measurable depending on how thread is started.)

HEAD BEARING SURFACE: At right angles to body within 2°. On flat and oval, axes of head and body parallel within 2°.

CONCENTRICITY: Heads are concentric within 2% of maximum head diameter or .001" whichever is greater.

FILLET RADIUS: (under head): Not to exceed half the pitch except conical which shall not exceed twice the pitch.

LENGTH: + .005" unless otherwise specified.

SLOT CONCAVITY: Not to exceed 3% of mean head diameter. Slot location within .0015" (.001" on 0000-160).

SLOT DEPTH: The perpendicular distance from bottom of a slot at head circumference to top of head on all numbered series and on UNM flat heads. The standard for all other UNM heads is the distance from the bottom of the slot to the bearing surface of the head.