Model Engineer

What does "M.E." stand for in measurement of pipe threads?

I read this is a model engineering journal for 1/4" x 40 M.E. threads

ME (in this context) stands for "Model Engineer" and is usually used in connection with thread taps and dies.

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Microcosm M22 Steam Engine Model
Microcosm M22 Steam Engine Model
$49.55
1 4 40 MODEL ENGINEER CROSS FITTING New Train Parts
1 4 40 MODEL ENGINEER CROSS FITTING New Train Parts
$3.80
MODEL ENGINEER SERIES 5 16 27 COUPLING FITTING NEW TRAIN PARTS
MODEL ENGINEER SERIES 5 16 27 COUPLING FITTING NEW TRAIN PARTS
$3.35
5 16 27 TPI STREET ELBOW MODEL ENGINEER FITTING NEW TRAIN PARTS
5 16 27 TPI STREET ELBOW MODEL ENGINEER FITTING NEW TRAIN PARTS
$3.75
PAIR OF TUBE UNIONS 5 16 27 MODEL ENGINEER THREADED FITTINGS FOR 5 32 TUBE
PAIR OF TUBE UNIONS 5 16 27 MODEL ENGINEER THREADED FITTINGS FOR 5 32 TUBE
$8.50
Live Steam 5 16 27 Model Engineer 45 Elbow New Item
Live Steam 5 16 27 Model Engineer 45 Elbow New Item
$2.25
Live Steam 3 16 40 MTP Model Engineer Angle Check Valve New Item
Live Steam 3 16 40 MTP Model Engineer Angle Check Valve New Item
$12.00
Live Steam 3 16 40 MTP Model Engineer TEE New Item
Live Steam 3 16 40 MTP Model Engineer TEE New Item
$2.25
Live Steam 1 4 40 MTP Model Engineer Angle Check Valve New Item
Live Steam 1 4 40 MTP Model Engineer Angle Check Valve New Item
$12.00
Live Steam 5 16 27 MTP Model Engineer Street Elbow New Item
Live Steam 5 16 27 MTP Model Engineer Street Elbow New Item
$3.45
Live Steam 1 4 40 MTP Model Engineer Cross Fitting New Item
Live Steam 1 4 40 MTP Model Engineer Cross Fitting New Item
$2.50
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Live Steam 3 16 40 MTP Model Engineer Straight Check Valve New Item
$12.00
Live Steam 3 16 40 MTP Model Engineer Cross Fitting New Item
Live Steam 3 16 40 MTP Model Engineer Cross Fitting New Item
$2.40
Thomas The Tank Engine Set of Rickety Suspension Bridge Model Railroad
Thomas The Tank Engine Set of Rickety Suspension Bridge Model Railroad
$89.22
16 HUGE Union Pacific BIG BOY Wood Model 4 8 8 4 Steam Engine 1 8 Scale
16 HUGE Union Pacific BIG BOY Wood Model 4 8 8 4 Steam Engine 1 8 Scale
$9,999.98
Live Steam 5 32 48 MTP Model Engineer 5 8 Pipe Nipple Set of 5 New Item
Live Steam 5 32 48 MTP Model Engineer 5 8 Pipe Nipple Set of 5 New Item
$5.00
MODEL ENGINEER 5 16 27 TPI 1 16 NPT STRAIGHT GLOBE VALVE NEW TRAIN PARTS
MODEL ENGINEER 5 16 27 TPI 1 16 NPT STRAIGHT GLOBE VALVE NEW TRAIN PARTS
$30.00
PAIR OF TUBE UNIONS 3 16 40 MODEL ENGINEER THREADED FITTINGS FOR 3 32 TUBE NEW
PAIR OF TUBE UNIONS 3 16 40 MODEL ENGINEER THREADED FITTINGS FOR 3 32 TUBE NEW
$8.40
PAIR OF TUBE UNIONS 1 4 40 MODEL ENGINEER THREADED FITTINGS FOR 1 8 TUBE NEW
PAIR OF TUBE UNIONS 1 4 40 MODEL ENGINEER THREADED FITTINGS FOR 1 8 TUBE NEW
$8.50
5 32 48 MTP Model Engineer BRASS UNION New Train Parts
5 32 48 MTP Model Engineer BRASS UNION New Train Parts
$3.00
vtg Antique J Chein NYC  HR 714 Tinplate Engine Tender Model Railroad Train
vtg Antique J Chein NYC HR 714 Tinplate Engine Tender Model Railroad Train
$4.99
vtg Gilbert American Flyer Line 120 Engine Coal Tender Model Railroad Train Car
vtg Gilbert American Flyer Line 120 Engine Coal Tender Model Railroad Train Car
$4.99
vtg MARX New York Central NYC Engine Tender Model Railroad Train Coal Car Tin
vtg MARX New York Central NYC Engine Tender Model Railroad Train Coal Car Tin
$4.99
vtg Marx Union Pacific 551 Engine Coal Tender Tinplate Model Railroad Train Car
vtg Marx Union Pacific 551 Engine Coal Tender Tinplate Model Railroad Train Car
$4.99
Lima Models Crick Italian Model Railroads  Trains track coach steam engine
Lima Models Crick Italian Model Railroads Trains track coach steam engine
$14.99
Live Steam 5 32 48 MTP Model Engineer TEE New Item
Live Steam 5 32 48 MTP Model Engineer TEE New Item
$2.50
Live Steam 5 32 48 MTP Model Engineer Angle Check Valve New Item
Live Steam 5 32 48 MTP Model Engineer Angle Check Valve New Item
$12.00
Athearns LeHigh Valley Model Railroad Engine 221
Athearns LeHigh Valley Model Railroad Engine 221
$159.99
LeHigh Valley Model Railroad Engine 512
LeHigh Valley Model Railroad Engine 512
$199.99
Athearns Lehigh Vallley Model Railroad Engine 602
Athearns Lehigh Vallley Model Railroad Engine 602
$199.99
Vintage Gnomy Friction Motor Stainzi 2 Steam Engine 9901989 West Germany Model
Vintage Gnomy Friction Motor Stainzi 2 Steam Engine 9901989 West Germany Model
$19.00
1 4 NPT 90 STREET ELBOW NEW GRAND SCALE MODEL ENGINEER FITTING Train Parts
1 4 NPT 90 STREET ELBOW NEW GRAND SCALE MODEL ENGINEER FITTING Train Parts
$3.90


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