1/4"-20 x 3" Type F Thread Cutting Screws / Slotted / Hex Washer Head / Low Carbon Steel / Zinc
- Steel
- Zinc
- 20 TPI · Coarse
- ASME B18.6.3
$110.09
$1.57 / pc
Package of 70
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Product Description
1/4"-20 x 3" Type F Thread Cutting Screws / Slotted / Hex Washer Head / Low Carbon Steel / Zinc
1/4"-20 x 3" thread-cutting screw in Low Carbon Steel, zinc finish. For cutting a clean mating thread in brittle or hard material.
- HEX WASHER HEAD — an integral flange under a hex head spreads load without a separate washer and stops pull-through in sheet material
- SLOTTED DRIVE — a straight slot for hand driving, restoration and period work
- ZINC PLATED — an electroplated barrier for interior and sheltered work; it will not survive sustained weather or contact with treated lumber
- FULL THREAD — threaded to the head, so it grips over the whole length and suits thin or variable stack-ups
- CARBON STEEL — strong and inexpensive, but it depends entirely on its plating for corrosion protection
RoHS Compliant
$110.09
$1.57/pc
Type F Thread Cutting Screws / Slotted / Hex Washer Head
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1/4"-20 x 3" Type F Thread Cutting Screws / Slotted / Hex Washer Head / Low Carbon Steel / Zinc
SKU: 1448FSW-70
Technical Specifications
Thread Size
1/4"-20
Thread Series
UNC
Thread Pitch
20 TPI
Thread Coverage
Full Thread
Thread Action
Thread Cutting
Tapping Type
Type F
Length
3"
Material
Steel
Finish
Zinc
Drive
Slotted
Head Style
Hex Washer Head
Standard
ASME B18.6.3
Country of Origin
Import
Point Type
Blunt Tapered
Head Diameter (in)
3/8
Measurement System
Inch
Head Height (in)
0.172–0.190
Width Across Flats
3/8"
SKU
1448FSW-70
Pilot Hole by Steel Thickness (1/4"-20)
| Steel Thickness (in) | Pilot Hole (in) | Drill Size |
|---|---|---|
| 0.083 | 0.213 | #3 |
| 0.109 | 0.219 | 7/32 |
| 0.125 | 0.221 | #2 |
| 0.140 | 0.221 | #2 |
| 0.187 | 0.228 | #1 |
| 0.250 | 0.228 | #1 |
| 0.312 | 0.228 | #1 |
| 0.375 | 0.228 | #1 |
| 0.500 | 0.228 | #1 |
Source: Machinery's Handbook, 26th ed., Table 13 (steel). It may be necessary to vary the hole size to suit a particular application.
https://www.ecomfasteners.com/products/1-4-20-x-3-type-f-thread-cutting-screws-slotted-hex-washer-head-steel-zinc · Printed