Square Head Pipe Plugs

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Square Head Pipe Plugs are available in steel. Brass and stainless steel may be available by special order. 

Size Pitch Hex - Across Flats Diameter Nominal Body Lenght Nominal Key Engagement Nominal Tapping Drill Size Taper NPT
1/16 27 7/32 0.310 0.300 0.185 D
1/8 27 9/32 0.375 0.300  0.245  Q
1/4 18 3/8 0.540 0.460  0.290  7/16
3/8 18 7/16 0.675 0.460  0.315  9/16
1/2 14 9/16 0.840 0.610  0.395  45/64
3/4 14 5/8 1.050 0.620   0.455  29/32
1 11 1/2 13/16 1.315 0.770  0.520  1 9/64
1 1/4 11 1/2 15/16 1.660 0.820  0.580  1 47/64
1 1/2 11 1/2 1 1/8 1.905 0.850  0.640  1 47/64
2 11 1/2 1 5/16 2.380 0.900  0.700  2 13/16

It is recommended that you ream the hole with a reamer having a taper of 3/4" per foot before tapping. 

We offer the lowest minimums in the industry, and sell by the piece or in
bulk - you buy only the fasteners you need!

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