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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

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 ThreadMin. Depth
AB
2.5 x 0.45 3.97 3.97
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):

To convert inches to millimeters, multiply inches x 25.4. To convert millimeters to inches multiply millimeters x 0.039370.


SPACER TOLERANCES:

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


METRIC THREADS

Clearance HoleRecommended Thread SizesDepth of Thread
Recommended blind hole thread engagement(Drilled and Tapped both ends)
Diameter x PitchClearance Hole RangeDiameter x PitchThread SizeScrew Engagement
1.6 x 0.35 1.8 - 2.1 M1.6 x 0.35 M 2.5 4.8 mm
2.0 x 0.40 2.2 - 2.8 2.0 x 0.40 3.0 8.4
2.5 x 0.45 2.7 - 3.1 2.5 x 0.45 3.5 9.5
3.0 x 0.50 3.2 - 3.6 3.0 x 0.50 4.0 11.1
3.5 x 0.60 3.7 - 4.2 3.5 x 0.60 5.0 12.7
4.0 x 0.70 4.2 - 4.8 4.0 x 0.70 6.0 14.3
5.0 x 0.80 5.3 - 6.0 5.0 x 0.80 7.0 14.3
6.0 x 1.00 6.3 - 7.0 6.0 x 1.00    
6.3 x 1.00 6.7 - 7.5 6.3 x 1.00    
8.0 x 1.25 8.5 - 9.5 8.0 x 1.25    
    10.0 x 1.5    
    12.0 x 1.75    

Length of Thread:

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


Dimensions in millimeters

Thread Size 'D'M2M2.5M3M4M5M6
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'M3M4M5M6
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'M2M2.5M3M4M5M6
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'M2M2.5M3M4M5M6M8M10
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'M3M4M5M6M8M10M12M14M16M20
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'M4M5M6M8M10M12M14M16M20M24
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 LengthTolerance 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

8ths/4ths16ths32nds64thsSAE DecimalMillimeters
      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 .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