What size drill bit do I need for 1/4-20 Heli-Coil?
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| UNC | ||
|---|---|---|
| Insert Size | Drill Size | Wire Thread Insert Length |
| 1/4-20 | 6.7 mm | 0.250 |
| 5/16-18 | 8.3 mm | 0.312 |
| 3/8-16 | 9.9 mm | 0.375 |
What size tap do you use for a 1/4 28 Heli-Coil?
Tap Size: 1/4-28 STI. Drill Size: 17/64″
How do I choose the right size Heli-Coil?
Drill out the damaged threads using the drill supplied in the kit. Drill to a sufficient depth to accommodate the insert length and the bolt or screw being used. Tap the hole using the Heli-Coil tap supplied in the kit. Check the size on the shank of the tap to be sure it is the right size.
What is the smallest HeliCoil?
SPECIFICATIONS
| Thread Insert Type | Helical Insert |
|---|---|
| Smallest Internal Thread Size | 5/16 – 18 |
| Largest Internal Thread Size | 5/16 – 18 |
| Material | 18-8 Stainless Steel |
What is the smallest HeliCoil size?
SPECIFICATIONS
| Thread Insert Type | Helical Insert |
|---|---|
| Smallest Internal Thread Size | 7/16 – 14 |
| Largest Internal Thread Size | 7/16 – 14 |
| Material | 18-8 Stainless Steel |
What is the minimum depth for helicoil drilling?
Helicoil Drill Chart The minimum drilling depths shown below allow for the following recommended practices: Countersinking the drilled hole to prevent a feather edge at the start of the tapped hole. 3/4 – 1-1/2 pitch of insert “set down” to allow for maximum production tolerance.
What size do Heli-Coil drill bits come in?
Heli-Coil drilling data – metric METRIC – DRILLED HOLE DIMENSIONS Nominal Minor Diameter Suggested Drill Size Thread Size Min. Max. Aluminum Steel, Magnesium ,Plastic METRIC COARSE M2X0.4 2.087 2.170 2.1 2.1 M2.2×0.45 2.297 2.397 2.3 2.35 M2.5×0.45 2.597 2.697 2.55 2.65 M3x0.5 3.108 3.220 3.15 3.2
How do you calculate helicoil drill data?
Helicoil Drilling Data – Metric For plug Taps 5/16″ or M8 and smaller. F is equal to the insert nominal length (Q) + ½ the nominal bolt diameter + 5 Pitch (allowing for tap chamfer, countersink and maximum “set-down”).
What are Heli-Coil screw inserts?
A distorted thread grips the screw to resist loosening. Without a prong to break off and retrieve, these inserts are often used where debris could cause damage. Also known as Heli-Coil inserts, they have coils that expand once installed to securely anchor the insert.
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