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MARYLAND METRICS
THREAD DATA CHARTS

MODEL ENGINEERS THREAD

Model Engineers Threads (Whitworth Form 55 Deg Thread Angle)
Thread Form Data
                Tapping Size
Thread Size OD Decimal TPI Pitch inch Pitch mm Core Dia inch Thread Depth inch inch Letter or Number mm
ME 1/8" 1/8" 0.125 40 0.025 0.635 0.093 0.016 0.0938 3/32" 2.4
ME 5/32" 5/32" 0.1562 40 0.025 0.635 0.1252 0.016 0.1285 30 3.25
ME 3/16" 3/16" 0.1875 40 0.025 0.635 0.1555 0.016 0.157 22 4
ME 7/32" 7/32" 0.2188 40 0.025 0.635 0.1868 0.016 0.189 12 4.8
ME 1/4" 1/4" 0.25 40 0.025 0.635 0.218 0.016 0.221 2 5.6
ME 1/4" 1/4" 0.25 32 0.03125 0.794 0.21 0.02 0.213 3 5.5
ME 9/32" 9/32" 0.2812 40 0.025 0.635 0.2492 0.016 0.257 F 6.6
ME 9/32" 9/32" 0.2812 32 0.03125 0.794 0.2412 0.02 0.246 D 6.3
ME 5/16" 5/16" 0.3125 40 0.025 0.635 0.2805 0.016 0.29 L 7.4
ME 5/16" 5/16" 0.3125 32 0.03125 0.794 0.2725 0.02 0.277 J 7.1
ME 3/8" 3/8" 0.375 40 0.025 0.635 0.343 0.016 0.348 S 8.9
ME 3/8" 3/8" 0.375 32 0.03125 0.794 0.335 0.02 0.339 R 8.6
ME 7/16" 7/16" 0.4375 40 0.025 0.635 0.4055 0.016 0.413 Z 10.5
ME 7/16" 7/16" 0.4375 32 0.03125 0.794 0.3975 0.02 0.404 Y 10.3
ME 1/2" 1/2" 0.5 40 0.025 0.635 0.468 0.016 0.4688 15/32 12.1
ME 1/2" 1/2" 0.5 32 0.03125 0.794 0.46 0.02 0.4688 15/32 11.9
Dimensions in Inches except where stated
Notes: The British Model Engineer Thread is based on the Whitworth thread with a pitch of 32 and 40 TPI.
A commercial use of this standard does not exist. The flank angle is 55
Click here to return to the thread data chart page index.

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