Metric SHCS Hole & Counterbore Sizes Nominal Screw size clearance Hole Dia. mm Counterbore Dia. mm Countersink Dia. mm Tapping drill mm Close Normal ISO M Fine M3 - M4 - M5 - M6 - M8 M10 M12 M14 M16 M20 M24 M30 - Imperial SHCS Hole & Counterbore Sizes Nominal Screw size clearance Hole Dia. mm Counterbore Dia. mm Countersink Dia. mm Tapping drill mm Close Normal UNF UNC 8 10 1/4" 5/16" 3/8" 7/16" 1/2" 5/8" 3/4" 7/8" 1" 1 1/4" 50 35
Imperial SHCS Hole & Counterbore Sizes Nominal Screw Size Clearance Hole Dia. mm Counterbore Dia. mm Countersink Dia. mm Tapping Drill mm Close Normal UNF UNC 8 4.6 5.0 8.0 4.8 3.5 3.4 10 5.2 5.6 9.5 5.5 4.1 3.8 1/4" 6.8 7.2 11.0 7.0 5.5 5.1 5/16" 8.4 8.8 13.5 8.8 6.9 6.6 3/8" 10.0 10.4 16.0 10.5 8.5 8.0 ...
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1 Metric SHCS Hole & Counterbore Sizes Nominal Screw size clearance Hole Dia. mm Counterbore Dia. mm Countersink Dia. mm Tapping drill mm Close Normal ISO M Fine M3 - M4 - M5 - M6 - M8 M10 M12 M14 M16 M20 M24 M30 - Imperial SHCS Hole & Counterbore Sizes Nominal Screw size clearance Hole Dia. mm Counterbore Dia. mm Countersink Dia. mm Tapping drill mm Close Normal UNF UNC 8 10 1/4" 5/16" 3/8" 7/16" 1/2" 5/8" 3/4" 7/8" 1" 1 1/4" 50 35
Tap & Clearance Drill Sizes 3/4. 20.00 25/32. 5 5.50. 0.22 39/64. 50% Thread for Steel, Stainless & Iron 75% Thread for Aluminum, Brass & Plastics. Author: M Braddock Subject: Drill & Tap Chart Created Date:
NOTE: Due to variations in lifter sizes and clearance preference, most of our engine builder customers prefer the lifter bores sized on the small size of the specification. Sometime these bores will need to be lightly honed. The lifter bore spec is .8747”-.8757”. Most lifter manufacturers recommend .0015”-.002” clearance.
sewage pumps capable of handling various sizes of solid waste be of the bottom intake design to reduce clogging and seal failures. If a check valve is incorporated in the installation, a vent hole (approx. 3/16" [5 mm]) must be drilled in the discharge pipe below the check valve and pit cover to purge the unit of trapped air.
The minimum clearance between reinforcing bars shall be 1-7⁄8” and is equal to 5 times the maximum coarse aggregate size (3⁄8”) for both, the longitudinal bars as well as the spiral confinement reinforcement, to allow for better concrete consolidation during placement. Concrete mix design and workability shall be consistent for tremie or