Thread Information

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

Bolts
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.