| Specifications |
|---|
| Thread Size | 1/4-20 |
| Coating | Dry Film Lubricant |
| Wire Insert Series | Non-Locking |
| Wire Insert Type | Tanged |
| Material | Stainless Steel |
| Material | 304 Stainless Steel |
| Length Nominal Dia. | 1 Dia. |
| Material Specification | AS7245 |
| Number of Free Coils | 3-3/8 |
| Free Coil Diameter Min. | .310 in |
| Free Coil Diameter Max. | .330 in |
| Finish Specification | AS5272 (Type I) |
| Finish Appearance | Dark Gray to Black |
| |
| Drilling Data |
|---|
| Suggested Drill Size ~ Aluminum | H |
| Suggested Drill Size ~ Steel, Magnesium, Plastic | H |
| Minimum Drilling Depth for Bottoming Taps | .450 in |
| Minimum Drilling Depth for Plug Taps | .675 in |
| Drilling Information | The minimum drilling depths shown below allow for the following recommended practices: 1. Countersinking the drilled hole to prevent a feather edge at the start of the tapped hole. 2. 3/4 - 1-1/2 pitch of insert ""set-down"" to allow for maximum production tolerance. Dimensions are shown for both plug and bottoming taps. (Note: Plug taps 5/16"" and smaller have a male center and the drilled hole depth dimensions allow for this length (one half of the diameter of the holt). Calculation of dimension ""F"" is as follows For Plug Taps 5/16"" and smaller: F = Insert Nominal Length (Q) + .5 (Bolt Nominal Diameter) + 4P (Tap Chamfer) + 1P (allowance for countersink and maximum insert set-down). For Plug Taps 3/8"" and larger: F = Insert Nominal Length(Q) + 4P (Tap Chamfer) + 1P (allowance for countersink and maximum insert set-down). For Bottoming Taps: F = Insert Nominal Length (Q) + 2P (Tap Chamfer) + 1P (allowance for countersink and maximum insert set-down). |
| |
| Tapping Data |
|---|
| Countersink Diameter Min. | .310 in |
| Countersink Diameter Max. | .340 in |
| Pitch Diameter Min. | .282 in |
| Pitch Diameter Max. ~ Class of Fit 3B_in | .285 in |
| Pitch Diameter Max. ~ Class of Fit 2B_in | .286 in |
| Minimum Tapping Depth | .300 in |
| Tap Major Diameter Max. | .319 in |
| |
| Taps & Gages |
|---|
| Tap High Spiral Flute Bottoming 2B | 6905-4 |
| Tap High Spiral Flute Bottoming 3B | 5905-4 |
| Tap Roughing | n/a |
| Tap Spiral Point Plug 2B | 4CSA |
| Tap Spiral Point Plug 3B | 4CSB |
| Tap Straight Flute Bottoming 2B | 4CBA |
| Tap Straight Flute Bottoming 3B | 4CBB |
| Tap Straight Flute Plug 2B | 4CPA |
| Tap Straight Flute Plug 3B | 4CPB |
| Reference Gage 2B | 1440-4 |
| Reference Gage 3B | 1688-4 |
| Working Gage 2B | 3688-4 |
| Working Gage 3B | 1442-4 |
