Strength of tapped holes: Strength tests show that any increase over 60% of thread for the tapped holes does not increase static strength of fastening. Tap breakage: If difficulty or breakage occurs, check drill size in view of material hardness and make sure tap is sharp.īreaking small drills: Small drills (1/8″ and under) break easily when they are not run at high speeds.ĭifficulty in drilling: If starting drill is difficult, thinning web of drill at the point solves this problem.Ĭlass of fit: Most commercial bolts and screws are made to fit 2A external thread standards, which fit with 2B tapped threads. UNC: Insert Size: Drill Size: Wire Thread Insert Length: 1D: 1.5D: 2D: 2.5D: 3D: 2-56 : 2.3 mm : 0.086 : 0.129 : 0.172 : 0.215 : 0.258 : 3-48 : 2.7 mm : 0.099 : 0.148. Strength of tapped holes: Strength tests show that any increase over 60% of thread for the tapped holesĭoes not increase static strength of fastening. Finding the correct drill size for a Spiralock tap may be a Cut and Try process: Not all drills are alike - to get good results, verify the actual hole size being produced by the drill. **For “Hard or Rough Materials”, 60-70% of thread. 6-32 Helicoils McMaster-Carr (630) 833-0300 Email Us Order Order History Filter by Clear all Thread Size See all 632 System of Measurement Material Nickel Stainless Steel Helical Insert Style With Prong Without Prong Installed Length Less than 0.25' 0.25' to 0. Recommended for “Free Cutting Materials” produces 65-75% of thread. *DRILL SIZES FOR Free Cutting Metals Steel, Aluminum Copper and Copper Alloys
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