Class X Thread Gage s on Half-Angle of Thread ± N NN' on Major or Minor Diameter on Pitch Diameter Above Above /2 Dia. 4 Dia. Through Through 4 Dia. 8 Dia. s Above 8 Dia. Through 2 Dia. Threads per Inch Lead, Inch Through 4 Dia. Above 4 Dia. Through /2 Dia. 80 0.0002 0 30' 0.0003 0.0002 72 0.0002 0 30' 0.0003 0.0002 64 0.0002 0 30' 0.0004 0.0002 56 0.0002 0 30' 0.0004 0.0002 0.0003 48 0.0002 0 30' 0.0004 0.0002 0.0003 40 0.0002 0 20' 0.0004 0.0002 0.0003 36 0.0002 0 20' 0.0004 0.0002 0.0003 32 0.0003 0 5' 0.0005 0.0007 0.0003 0.0004 0.0005 0.0006 28 0.0003 0 5' 0.0005 0.0007 0.0003 0.0004 0.0005 0.0006 27 0.0003 0 5' 0.0005 0.0007 0.0003 0.0004 0.0005 0.0006 24 0.0003 0 5' 0.0005 0.0007 0.0003 0.0004 0.0005 0.0006 20 0.0003 0 5' 0.0005 0.0007 0.0003 0.0004 0.0005 0.0006 8 0.0003 0 0' 0.0005 0.0007 0.0003 0.0004 0.0005 0.0006 6 0.0003 0 0' 0.0006 0.0009 0.0003 0.0004 0.0006 0.0008 4 0.0003 0 0' 0.0006 0.0009 0.0003 0.0004 0.0006 0.0008 3 0.0003 0 0' 0.0006 0.0009 0.0003 0.0004 0.0006 0.0008 2 0.0003 0 0' 0.0006 0.0009 0.0003 0.0004 0.0006 0.0008 /2 0.0003 0 0' 0.0006 0.0009 0.0003 0.0004 0.0006 0.0008 0.0003 0 0' 0.0006 0.0009 0.0003 0.0004 0.0006 0.0008 0 0.0003 0 0' 0.0006 0.0009 0.0003 0.0004 0.0006 0.0008 9 0.0003 0 0' 0.0007 0.00 0.0003 0.0004 0.0006 0.0008 8 0.0004 0 5' 0.0007 0.00 0.0004 0.0005 0.0006 0.0008 7 0.0004 0 5' 0.0007 0.00 0.0004 0.0005 0.0006 0.0008 6 0.0004 0 5' 0.0008 0.003 0.0004 0.0005 0.0006 0.0008 5 0.0004 0 5' 0.0008 0.003 0.0005 0.0006 0.0008 4 /2 0.0004 0 5' 0.0008 0.003 0.0005 0.0006 0.0008 4 0.0004 0 5' 0.0009 0.005 0.0005 0.0006 0.0008 Properly Handling Gages Clean the part before gaging to remove dirt and chips. Do not force the gage; use reasonably light pressure only. Protect the gage from damage; nicks and burrs allow inaccurate results. Keep the gage clean and lightly oiled to increase wear life. Avoid direct handling of gaging surfaces; fingerprints cause rust. 6
Taperlock Thread Plug - Taperlock Thread Plug Gages GO * = inch for 2 threads per inch and finer = /4 inches for threads per inch coarser than 2 NO GO L = Overall L2 = GO Member & = Only = GO Member L6 = NO GO Member Inch mm L Overall L2 Go Member with Only GO Member L6 NO GO Member Hex Size 0,60 2 /2 2 /32 /2 /4 3/6 3/6 000 2,00 2 2,5 3 4 3,00 2 3/32 2 3/32 3/4 5/6 7/32 /4 00 5 3,50 6 8 4,00 3 3/6 2 2/32 2 3/32 9/32 5/6 0 0 4,50 2 5,00 /4 6,00 4 /6 3 /2 2 3/4 /2 5/6 3/8 5/6 6,30 7,00 8,00 3/8 0,00 4 5/8 4 3 3/4 3/8 /2 2 7/6 2,00 /2 9/6 4,00 5 /8 4 3/8 3 /4 7/8 /2 /6 3 5/8 6,00 3/4 8,00 20,00 7/8 24,00 5 7/8 4 5/6 3 5/8 5/8 7/8 4 /8 /4 5 /2 + 4 3/8 + 4 * 3/4 5 3/8 /2 62
Reversible Thread Plug Gages Metric-Inch Pitch Equivalents Pitch (mm) Pitch (inch) Threads Per Inch 0,35 0.0378 72.57 0,40 0.0575 63.50 0,45 0.0772 56.44 0,50 0.0969 50.80 0,60 0.02362 42.33 0,70 0.02756 36.29 0,75 0.02953 33.87 0,80 0.0350 3.75 0,90 0.03543 28.22,00 0.03937 25.40,25 0.0492 20.32,50 0.05906 6.93,75 0.06890 4.5 2,00 0.07874 2.70 2,50 0.09843 0.6 3,00 0.8 8.46 4,00 0.5748 6.35 4,50 0.777 5.64 5,00 0.9685 5.08 6,00 0.23622 4.23 = Only = GO Member L6 = NO GO Member Inch Only GO Member L6 NO GO Member Hex Size 0 29/32 /2 /2 /4 W 2 2 5/32 5/8 5/8 3/8 2W 3 4 5 6 2 5/32 3/4 3/4 3/8 2W 8 0 3 /8 7/8 7/8 9/6 3W 2 /4 5/6 3 9/32 /6 4W 3/8 3 9/32 /8 /8 3/6 4W 7/6 4 3/6 /4 /4 3/6 5W /2 4 3/6 3/8 3/8 3/6 5W 9/6 4 7/32 /2 3/8 5/6 6W 3/4 4 2/32 3/4 3/8 /6 7W s are made to American Gage Design Standards. 63
General Dimension - Thread Ring Gages A = Outside Diameter B = Thickness C = Thickness of Hub D = Diameter of Hub All Blanks Thin Blanks Thick Blanks Inch mm Holder and Ring Blank A Outside Diameter B Thickness of Flange Depth of Counterbore of Thread B Thickness of Flange C Thickness of Hub D Diameter of Hub 0,60 /4 5/64 3/32 2,00 2 3 2,50 /4 3/64 5/32 4 3,00 5 3,50 6 8 4,00 /4 /32 3/6 0 5,00 2 /4 6,00 2 3/8 /32 5/6 8,00 3/8 0,00 3 3/4 7/6 7/6 2,00 /2 9/6 4,00 4 2 3/6 9/6 9/6 3/4 /6 5/8 6,00 3/4 20,00 7/8 24,00 5 2 5/8 /6 /6 5/6 /2 /8 /4 6 3 /4 3/4 3/4 /8 7/8 3/8 /2 64
Thread Setting Plug Gages GO Member - Thin Ring GO Member - Thick Ring NO GO Member L Overall Member L Overall Member L6 Member F F F2 Inch mm Truncation Truncation Truncation 2 0,60 2 /4 7/32 7/64 7/32 7/64 /2 000 2,00 2 3 2,50 2 9/6 3/8 3/6 3/8 3/6 /2 000 4 3,00 2 7/8 3/8 3/6 3/8 3/6 3/4 00 5 6 8 4,00 3 5/6 3/32 3/64 3/32 3/64 2 0 0 5,00 2 /4 6,00 4 3/4 3/4 3/8 3/4 3/8 2 3/4 5/6 8,00 3/8 0,00 5 /2 /2 /2 3 2 7/6 2,00 /2 9/6 4,00 6 /4 /4 5/8 6 7/8 7/8 5/6 /4 5/8 3 /4 3 5/8 6,00 3/4 20,00 7/8 24,00 7 /4 /2 3/4 7 7/8 2 /8 /6 3 5/8 3/4 3 5/8 4 /8 /4 3/8 /2 L = Overall = Only = GO Member L6 = NO GO Member F = GO Member Truncation F2 = NO GO Member Truncation 8 5/8 3/6 8 3/4 2 3/8 3/6 5/8 3/6 4 5 Note: Thread setting plug gages set thread ring gages. Thread setting plug gages have different length dimensions for thin and thick ring gages. 65
- NPT Taper Pipe Taperlock L Gage Taperlock L = GO Member Thread to Notch Ln = Neck (taperlock only) L2 = GO Member Thread Minimum = Member L to Notch L2 Ln Minimum Taperlock Diameter TPI Minus Style Only Hex Size /6 27 0.60.00 0.26 /4 2 3/4 3/8 /8 27 0.65.00 0.264 /4 3 /2 2 /4 8 0.2278.00 0.402 /4 3 /4 /6 3 3/8 8 0.240.00 0.408 /4 3 /4 /6 3 /2 4 0.320.00 0.534 5/6 3 5/8 7/8 4 3/4 4 0.339.00 0.546 5/6 3 5/8 7/8 4 /2 0.400.00 0.683 3/8 4 5 /4 /2 0.420.00 0.707 3/8 4 5 /2 /2 0.420.00 0.723 3/8 4 5 2 /2 0.436.00 0.757 3/8 4 5 2 /2 8 0.682.002.38 5 /8 6 3 8 0.766.002.200 5 /8 6 NPTF Taper Pipe Taperlock Gage L = GO Member Thread to Notch L2 = GO Member Thread Minimum L = of engagement in hand tight make up L3 = of 3 threads beyond L for wrench make up Fourth thread on L3 is for manufacturing and checking purposes only. = Member Diameter TPI L to Basic Notch Minus L2 Minimum L3 L + L2 Minus Hex Size /6 27 0.60.00.263.27.00 2 3/4 3/8 /8 27 0.65.00.26385.2726.00 3 /2 2 /4 8 0.2278.00.4078.3945.00 3 /4 /6 3 3/8 8 0.240.00.40778.4067.00 3 /4 /6 3 /2 4 0.320.00.5337.5343.00 3 5/8 7/8 4 3/4 4 0.339.00.5457.5533.00 3 5/8 7/8 4 /2 0.400.00.68278.6609.00 4 5 /4 /2 0.420.00.70678.6809.00 4 5 /2 /2 0.420.00.72348.6809.00 4 5 2 /2 0.436.00.75652.6969.00 4 5 2 /2 8 0.682.002.3750.0570.002 5 /8 6 3 8 0.766.002.20000.40.002 5 /8 6 Trilock 66
- NPT Taper Pipe L Ring Gage L = Thickness of Ring NPTF Taper Pipe Ring Gage D = Outside Diameter Diameter TPI L Plus D /6 27 0.600.00 /8 /8 27 0.65.00 /8 /4 8 0.2278.00 3/8 3/8 8 0.2400.00 /2 /2 4 0.3200.00 3/4 3/4 4 0.3390.00 2 /2 0.4000.00 2 /2 /4 /2 0.4200.00 3 /2 /2 0.4200.00 3 /4 2 /2 0.4360.00 3 3/4 2 /2 8 0.6820.002 4 /4 3 8 0.7660.002 5 L = Thickness of Thin Ring L2 = Thickness of Thick Ring D = Outside Diameter L L2 Diameter TPI Thin Ring Thick Ring Plus D /6 27 0.60 0.263.00 /8 /8 27 0.65 0.26385.00 /8 /4 8 0.2278 0.4078.00 3/8 3/8 8 0.240 0.40778.00 /2 /2 4 0.320 0.5337.00 3/4 3/4 4 0.339 0.5457.00 2 /2 0.400 0.68278.00 2 /2 /4 /2 0.420 0.70678.00 3 /2 /2 0.420 0.72348.00 3 /4 2 /2 0.436 0.75652.00 3 3/4 2 /2 8 0.682.3750.002 4 /4 3 8 0.766.20000.002 5 67