Engineering Information

Mohawk has developed many "Metal Stamping Design Standards" in order to ensure a quality stamping at a reasonable price.

Adherence to these standards is not necessary, but will keep the cost per 1000 pieces as low as possible.

View Metal Stamping Design Guidlines (.pdf - 55.7 kb)

THREAD INFORMATION

Mohawk can install optional threaded holes (up to two) in your metal stampings. Below are some helpful charts & information related to common tapped hole sizes produced by Mohawk:

Thread Minor Diameter Chart

Thread Size	Minimum Minor Diameter	Maximum Minor Diameter
0-80	.046	.052
1-64	.056	.062
1-72	.058	.064
2-56	.067	.074
2-64	.069	.075
3-48	.076	.085
3-56	.080	.087
4-36	.082	.091
4-40	.085	.097
4-48	.085	.097
5-40	.098	.106
5-44	.100	.108
6-32	.104	.114
6-40	.111	.119
6-56	.119	.126
8-32	.130	.139
8-36	.134	.142
10-24	.145	.155
10-32	.156	.164
1/4-20	.196	.207
1/4-28	.211	.219
Metric	Values below in mm	Values below in mm
M3 x 0.5	2.459	2.599
M3.5 x 0.6	2.850	3.010
M4 x 0.7	3.242	3.422
M4.5 x 0.75	3.688	3.878
M5 x 0.8	4.134	4.344

  
Thread Pitch Diameter Chart for Gauging based on 2B fit

Thread Size	"Go" Gauge - Pitch Ø	"No-Go" Gauge - Pitch Ø
0-80	.0519	.0542
1-64	.0629	.0655
1-72	.064	.0665
2-56	.0744	.0772
2-64	.0759	.0786
3-48	.0855	.0885
3-56	.0874	.0902
4-40	.0958	.0991
4-48	.0985	.1016
5-40	.1088	.1121
5-44	.1102	.1134
6-32	.1177	.1214
6-40	.1218	.1252
8-32	.1437	.1475
8-36	.1460	.1496
10-24	.1629	.1672
10-32	.1697	.1736
1/4-20	.2175	.2224
1/4-28	.2268	.2311
Metric	Values below in mm	Values below in mm
M3 x 0.5	2.675	2.775
M3.5 x 0.6	3.110	3.222
M4 x 0.7	3.545	3.663
M4.5 x 0.75	4.013	4.131
M5 x 0.8	4.480	4.605

Percent of Thread

We recommend the use of "Pressure" or "Cold Formed" threads as opposed to "Cut" threads whenever possible. This eliminates the problems associated with chip removal from the finished parts and provides greater "strip out" torque strength.

The normal "Percent of Thread" that can be expected from the thread form process is 65% to 75%.

Screw Thread Terminology (Copied from Jarvis Cutting Tools, Inc. Catalog)

External Threads	An external thread is a thread on the outside of a member.
Internal Threads	An internal thread is a thread on the inside of a member.
Major Diameter	The largest diameter of the thread of a screw or nut.
Minor Diameter	The smallest diameter of the thread of a screw or nut.
Pitch Diameter	On a straight screw thread, the diameter of an imaginary cylinder, the surface of which would pass through the threads at such points as to make equal the width of the threads and the width of the spaces cut by the surface of the cylinder. On a taper screw thread, the diameter, at a given distance from a reference plane perpendicular to the axis of a imaginary cone, the surface of which would pass through the threads at such point as to make equal the width of the threads and the width of the spaces cut by the surface of the cone.
Pitch	The distance from one point on a screw thread to a corresponding point on the next thread measured parallel to the axis.
Lead	The distance a screw thread advances axially in one turn.  On a single-thread screw the lead & pitch are identical; on a double-thread screw the lead is twice the pitch; on a triple thread screw the lead is three times the pitch, etc.
Angle of Thread	The angle included between the sides of the thread measured in an axial plane.
Half Angle of Thread	The angle included between the sides of the thread and the normal to the axis, measured in an axial plane.
Helix Angle	The angle made by the helix, or conical spiral, of the thread at the pitch diameter with a plane perpendicular to the axis.
Crest	The surface of the thread corresponding to the major diameter of the screw and the major diameter of the nut.
Root	The surface of the thread corresponding to the minor diameter of the screw and the major diameter of the nut.
Side or  Flank	The surface of the thread which connects the crest to the root.
Axis of a Screw	The longitudinal central line through the screw.
Base of Thread	The bottom section of the thread; the greatest section between the two adjacent roots.
Depth of Thread	The distance between the crest and the base of the thread measured normal to the axis.
Number of Threads	Number of threads in one inch of length.
Thickness of Thread	The distance between the adjacent sides of the thread measured along or parallel to the pitch line.

Disclaimer: The above information is provided as a courtesy of Mohawk Manufacturing. Every attempt has been made to insure accuracy, however please rely on this information at your own risk. Mohawk Manufacturing shall not be responsible for results or consequences of the use of this information.