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ORDERING METRIC SIZES

 How to order  |  Conversion  |  Metric-SAE Equivalents Table  |  Metric Threads  |  Length of threads  |  Screw dimensions
 

HOW TO ORDER METRIC PARTS

  (Return to Top) Once you have selected one of our American Standard Parts, you just need to add your metric requirement in the RFQ. For example, for a Threaded Spacer the metric requirement might be "M 3.5 x 0.6 Thread".

How to order metric male/female standoff

Once you have selected one of our American Standard Parts, you just need to add your metric requirement in the RFQ. For example, "M3.0 x .5 Thread".
Metric Thread
Min. Depth
'A'
'B'
2.5 x 0.45
3.97
4.76
3.0 x 0.50
4.76
6.35
3.5 x 0.60
6.35
9.53
4.0 x 0.70
9.53
11.10
5.0 x 0.80
9.53
12.70
6.0 x 1.00
12.70
15.00
8.0 x 1.25
12.70
15.00
If you need a longer Male Thread than shown in the table above, you may add your requirement. For example, "B = 3.0 x .5 Thread, B = 7.5 MM Length
 
NOTE: When the body length L is less than or equal to the thread depth A, we will provide the maximum number of threads possible.

CONVERSION (SAE to Metric & Metric to SAE):

  (Return to Top):
To convert inches to millimeters, multiply inches x 25.4. To convert millimeters to inches multiply millimeters x 0.039370.
 

SPACER TOLERANCES:

  (Return to Top)
Tolerances in manufacture of Standoffs and Spacers. Length: up to 100MM long ±.13 MM. O.D. ±.152 MM
 

METRIC THREADS

  (Return to Top)

Clearance Hole

Diameter
x Pitch
Clearance
Hole Range
1.6 x 0.35
1.8 - 2.1
2.0 x 0.40
2.2 - 2.8
2.5 x 0.45
2.7 - 3.1
3.0 x 0.50
3.2 - 3.6
3.5 x 0.60
3.7 - 4.2
4.0 x 0.70
4.2 - 4.8
5.0 x 0.80
5.3 - 6.0
6.0 x 1.00
6.3 - 7.0
6.3 x 1.00
6.7 - 7.5
8.0 x 1.25
8.5 - 9.5

Recommended Thread Sizes

Diameter x Pitch
M1.6 x 0.35
2.0 x 0.40
2.5 x 0.45
3.0 x 0.50
3.5 x 0.60
4.0 x 0.70
5.0 x 0.80
6.0 x 1.00
6.3 x 1.00
8.0 x 1.25
10.0 x 1.5
12.0 x 1.75
14.0 x 2.00

Depth of Thread

Recommended blind hole
thread engagement
(Drilled and Tapped both ends)
Thread
Size
Screw
Engagement
M 2.5
4.8 mm
3.0
8.4
3.5
9.5
4.0
11.1
5.0
12.7
6.0
14.3
7.0
14.3

Length of Thread:

  (Return to Top)
Brass, Aluminum & Steel Parts: M2.5 thread is tapped thru 15.99 MM in length. M3 and larger thread is tapped thru 25.4 MM in length.
Stainless Steel & Nylon Parts: M2.5 thread is tapped thru 9.6 MM in length M3 thread is tapped thru 12.7 MM in length.
M3.5 and larger thread is tapped thru 25.4 MM in lengths. For lengths longer than specified above, see Depth of Thread Chart.

 

Oval Head Machine Screws

  (Return to Top)
Dimensions in millimeters

Thread Size 'D'
M2
M2.5
M3
M4
M5
M6
Head Height, Max "K"
1.7
2.1
2.4
3.7
3.9
4.7
Head Dia, Max "D2"
4.4
5.5
6.3
9.4
10.4
12.6
Driver Size "No."
1
1
1
2
2
3

 

Pan Head Slotted Machine Screws


Dimensions in millimeters

Thread Size 'D'
M3
M4
M5
M6
Head Height, Max "K"
1.8
2.4
3
3.6
Head Dia, Max "D2"
6
8
10
12
Driver Size "No."
.50
.70
.80
1

 

Pan Head Crossed Recessed Machine Screws


Dimensions in millimeters

Thread Size 'D'
M2
M2.5
M3
M4
M5
M6
Head Height, Max "K"
1.6
2
2.4
3.1
3.8
4.6
Head Dia, Max "D2"
4
5
6
8
10
12
Driver Size "No."
1
1
1
2
2
3

 

Flat Head Machine Screws


Dimensions in millimeters

Thread Size 'D'
M2
M2.5
M3
M4
M5
M6
M8
M10
Head Height, Max "K"
1.2
1.5
1.65
2.2
2.5
3
4
5
Head Dia, Max "D2"
3.8
4.7
5.6
7.5
9.2
11
14.5
18
Pitch "P"
.40
.45
.50
.7
.8
1
1.25
1.50

 

Socket Head Cap Screws


Dimensions in millimeters

Thread Size 'D'
M3
M4
M5
M6
M8
M10
M12
M14
M16
M20
Head Height, Max "K"
3
4
5
6
8
10
12
14
16
20
Head Dia, Max "D2"
5.5
7
8.5
10
13
16
10
21
24
30
Hex Key Sz "S"
2.5
3
4
5
6
8
10
12
14
17

 

Hexagon Head Cap Screws


Dimensions in millimeters

Thread Size 'D'
M4
M5
M6
M8
M10
M12
M14
M16
M20
M24
Head Height, Max "K"
2.8
3.5
4
5.5
7
8
9
10
13
15
Across Flats, "S"
.7
8
10
13
17
19
22
24
30
36
Pitch, "P"
.7
.8
1
1.25
1.5
1.75
2
2
2.5
3

 

Button Head Screws


Dimensions in millimeters

Head Dia, Max 'B'
Head Height, Max 'R'
Socket Size, Nom 'S'
5.7
1.65
2
7.6
2.20
2.5
9.5
2.75
3
10.5
3.30
4
14.0
4.40
5
17.5
5.50
6
21.0
6.60
8
28.0
8.80
10

 

Important Data, Metric, Machine Screws


Dimensions in millimeters

Nominal Screw Length
Tolerance on Length, mm
to 3 mm incl.
.2
over 3 to 10 mm
.3
over 10 to 16 mm
.4
over 16 to 50 mm
.5
over 50 mm
1.0

 
Position of Head: The axis of the head shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 6% of the specified maximum head diameter, or the specified maximum width across flats of hex and hex flange heads, regardless of feature size.
 
All tolerances are plus and minus.

 

ASM METRIC - SAE EQUIVALENTS

  Return to Top

8ths/4ths

16ths

32nds

64ths

SAE
Decimal

Millimeters

   
1/64
.016
0.397
  
1/32
 
.031
0.794
   
3/64
.047
1.191
 
1/16
  
.062
1.588
   
5/64
.078
1.984
  
3/32
 
.094
2.381
   
7/64
.109
2.778
1/8
   
.125
3.175
   
9/64
.141
3.572
  
5/32
 
.156
3.969
   
11/64
.172
4.366
 
3/16
  
.188
4.763
   
13/64
.203
5.159
  
7/32
 
.219
5.556
   
15/64
.234
5.953
1/4
   
.250
6.350
   
17/64
.266
6.747
  
9/32
 
.281
7.144
   
19/64
.297
7.541
 
5/16
  
.312
7.938
   
21/64
.328
8.334
  
11/32
 
.344
8.731
   
23/64
.359
9.128
3/8
   
.375
9.525
   
25/64
.391
9.922
  
13/32
 
.406
10.319
   
27/64
.422
10.716
 
7/16
  
.438
11.113
   
29/64
.453
11.509
  
15/32
 
.469
11.906
   
31/64
.484
12.303
1/2
   
.500
12.700
   
33/64
.516
13.097
  
17/32
 
.531
13.494
   
35/64
.547
13.891
 
9/16
  
.562
14.288
   
37/64
.578
14.684
  
19/32
 
.594
15.081
   
39/64
.609
15.478
5/8
   
.625
15.875
   
41/64
.641
16.272
  
21/32
 
.656
16.669
   
43/64
.672
17.066
 
11/16
  
.688
17.463
   
45/64
.703
17.859
  
23/32
 
.719
18.256
   
47/64
.734
18.653
3/4
   
.750
19.050
   
49/64
.766
19.447
  
25/32
 
.781
19.844
   
51/64
.797
20.241
13/16
   
.812
20.638
   
53/64
.828
21.034
  
27/32
 
.844
21.431
   
55/64
.859
21.828
7/8
   
.875
22.225
   
57/64
.891
22.622
  
29/32
 
.906
23.019
   
59/64
.922
23.416
 
15/16
  
.938
23.813
   
61/64
.953
24.209
  
31/32
 
.969
24.606
   
63/64
.984
25.003
1
   
1.000
25.400

 
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