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3591-4CN250 Tanged Locking Insert

SKU: 04550 | MPN: 3591-4CN250
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Thread Size1/4-28
CoatingNo Finish
Wire Insert SeriesLocking
Wire Insert TypeTanged
MaterialStainless Steel
Material304 Stainless Steel
Length Nominal Dia.1 Dia.
Material SpecificationAS7245
Number of Free Coils5
Free Coil Diameter Min..306 in
Free Coil Diameter Max..326 in
Finish SpecificationDyed Red for Identification
Finish AppearanceDyed Red
Locking Torque Data
Locking Torque Max.30 in·lb
Locking Torque Min. 15th Cycle3.5 in·lb
Drilling Data
Suggested Drill Size ~ AluminumG
Suggested Drill Size ~ Steel, Magnesium, Plastic6.7 mm
Minimum Drilling Depth for Bottoming Taps.393 in
Minimum Drilling Depth for Plug Taps.589 in
Drilling InformationThe 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..290 in
Countersink Diameter Max..320 in
Pitch Diameter Min..273 in
Pitch Diameter Max. ~ Class of Fit 3B_in.275 in
Pitch Diameter Max. ~ Class of Fit 2B_in.276 in
Minimum Tapping Depth.290 in
Tap Major Diameter Max..300 in
Taps & Gages
Tap High Spiral Flute Bottoming 2B6906-4
Tap High Spiral Flute Bottoming 3B5906-4
Tap Spiral Point Plug 2B4FSA
Tap Spiral Point Plug 3B4FSB
Tap Straight Flute Bottoming 2B4FBA
Tap Straight Flute Bottoming 3B4FBB
Tap Straight Flute Plug 2B4FPA
Tap Straight Flute Plug 3B4FPB
Reference Gage 2B1441-4
Reference Gage 3B1694-4
Working Gage 2B3694-4
Working Gage 3B1443-4