ORDERING METRIC SIZES
How to Order | Conversion | Metric-SAE Equivalents Table | Metric Threads | Length of threads | Screw dimensions | Spacer Tolerances
HOW TO ORDER METRIC PARTS
ASM makes it easy to order metric hardware, including metric screws, spacers, and standoffs. 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”. Below you’ll find details on conversions and dimensions that will help you order parts like metric screws and standoffs.
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 | 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 the manufacture of Standoffs and Spacers. Length: up to 100MM long ±.13 MM. O.D. ±.152 MM
METRIC THREADS
Clearance Hole | Recommended Thread Sizes | Depth of Thread Recommended blind hole thread engagement(Drilled and Tapped both ends) |
||
---|---|---|---|---|
Diameter x Pitch | Clearance Hole Range | Diameter x Pitch | Thread Size | Screw 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 threads are tapped thru 25.4 MM in lengths. For lengths longer than specified above, see Depth of Thread Chart.
SCREW DIMENSIONS
Oval Head Machine Screws
Metric screw dimensions in millimeters, including M2.5 and M4 screws.
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
Metric screw 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
Metric screw 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 a 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/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 | .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 |