247Pcs 304 Stainless Steel Black Oxide Self Tapping Screws Kit - #6 #8 Phillips Pan Head Sheet Metal Screws
247Pcs 304 Stainless Steel Black Oxide Self Tapping Screws Kit - #6 #8 Phillips Pan Head Sheet Metal Screws
247 pieces, and no filler. Just #6 and #8 - the sizes sheet metal work actually burns through - in six length combinations, sorted into a labeled compartment case. Grab the box, find the size, get back to the job.
Every screw is cold-formed from 304 stainless and finished with black oxide. The stainless stops the rust streaks you get from zinc-plated carbon steel. The black oxide cuts glare and, more importantly, reduces galling - that sticking and seizing you hit when stainless threads meet stainless or aluminum.
Thread geometry is where cheap self-tappers fail, and it's the one thing you can't see in a photo. We draw, head, thread, and inspect in our own plant, with IATF 16949 lot control on every batch. Consistent threads mean consistent torque, which means fewer stripped holes.
If you've been burned by mystery-brand screw kits before, we get it. That's why every lot ships with test documentation and why the specs on this page match the box in your hand. What you see here is what leaves our dock.
Full Specification Table
| Parameter | Specification |
|---|---|
|
Material |
304 (A2) austenitic stainless steel |
|
Finish |
Black oxide |
|
Size range |
#6 (ST3.5), #8 (ST4.2) |
|
Lengths |
1/2", 3/4", 1", 1-1/4" |
|
Head |
Pan head |
|
Drive |
Phillips PH2 |
|
Point |
Type AB, sharp self-tapping point |
|
Thread form |
Machine screw thread, Type AB |
|
Applicable standards |
ANSI B18.6.3, DIN 7981, ISO 7049 |
|
Corrosion resistance |
304 base material; black oxide reduces galling and glare |
|
Packaging |
247 pcs, 6-compartment labeled case |
|
Quality system |
IATF 16949, ISO 9001 |
|
Test documents |
EN 10204 3.1 per lot |
Size Chart
| Size | Length | Thread | Head Dia | Driver | Qty |
|---|---|---|---|---|---|
|
#6 |
1/2" |
20 |
0.294" |
PH2 |
50 |
|
#6 |
3/4" |
20 |
0.294" |
PH2 |
50 |
|
#8 |
1/2" |
18 |
0.322" |
PH2 |
40 |
|
#8 |
3/4" |
18 |
0.322" |
PH2 |
40 |
|
#8 |
1" |
18 |
0.322" |
PH2 |
37 |
|
#8 |
1-1/4" |
18 |
0.322" |
PH2 |
30 |
|
Total |
|
|
|
247 pcs |
8. Applications
- HVAC ductwork, plenums, and registers
- Gutters, downspouts, and drip edges
- Metal studs and drywall track
- Aluminum framing and extrusions
- Plastic housings and electrical enclosures
- Wood-to-metal connections
- RVs, trailers, and truck boxes
- Signage and light gauge framing
Why Choose Fasto?
Fasto has run its own fastener plant for over 20 years - drawing, heading, threading, finishing, and inspecting under one roof. Nothing is resold or rebranded from a third source.
- 20+ years of fastener export, own factory and tooling
- IATF 16949 and ISO 9001 quality systems
- CE, SGS, and RoHS product certifications
- DIN, ISO, and ANSI standard compliance across ranges
- Lot-level traceability with EN 10204 3.1 test certificates
- Consistent thread geometry - the root cause behind most stainless screw failures
Pain Points & Solutions
| Pain Point | Why It Happens | How This Kit Answers |
|---|---|---|
|
Rust streaks on finished work |
Zinc or bare carbon steel corrodes when it gets wet |
304 stainless base; the black oxide is a finish, not a corrosion band-aid |
|
Threads strip in thin sheet metal |
Oversized pilot hole, over-torque, or soft thread form |
Sharp Type AB point plus consistent thread geometry; drive at low speed near the end |
|
Phillips cam-out and mangled heads |
Worn bit, high RPM, or shallow recess |
ANSI-true recess; pair with a fresh PH2 bit, seat it fully, keep speed low |
|
Kit runs out of the size you need |
Boxes stuffed with rarely-used sizes |
#6/#8 focused assortment with balanced counts; labeled compartments |
|
Stainless seizing and galling |
304 on 304 or aluminum friction welds the threads |
Black oxide surface lowers friction and eases removal |
|
Inconsistent quality batch to batch |
Mixing suppliers, no traceability |
Single factory, IATF 16949 lot control, test certs per lot |
FAQ
Self-tapping screws cut their own threads into a pre-drilled hole. Self-drilling screws (Tek-style) have a drill-bit tip, so they make the hole and the threads in one pass. For light sheet metal, wood, plastic, and aluminum, self-tapping is usually the right call - and it leaves a cleaner hole than a Tek point.
For thin sheet metal - up to about 1/16" - usually not. The Type AB point taps in directly. On thicker steel, drill a pilot hole near the thread's minor diameter: roughly 0.107" for #6 and 0.131" for #8. When in doubt, drill. A stripped hole costs more time than a pilot hole ever will.
No, and here's the key: the screw underneath is 304 stainless. The black oxide is a surface treatment for looks and anti-galling - not a plating that can wear off. Compare that to zinc-plated carbon steel, which streaks rust the first time it gets wet. Outdoors, 304 holds up far better.
For everyday sheet metal loads, yes - 304 cold-formed screws are the standard choice. Two things matter more than raw strength: the pilot hole and the length. If the screw itself has to carry real shear, step up one diameter rather than pushing a longer #8.
You can. Wood: drive slowly so the threads cut instead of burn. Plastic: pilot slightly above the minor diameter so the thread doesn't crack the part. Aluminum: fine, but back off the torque - 304 grabs soft aluminum hard and will tell you when to stop.
Three usual suspects. A worn PH2 bit. Too much speed. Or the bit not seated fully before you pull the trigger. Fix: fresh bit, firm downward pressure, low RPMs as the head seats. Cam-out is the screw telling you to slow down - not to lean harder.
304 (A2) is austenitic: the most corrosion-resistant common grade, non-magnetic, right for outdoor and coastal work. 410 is martensitic: harder and magnetic, often used where the screw has to drill into hard steel, but it rusts faster. Rust resistance first - pick 304. Drilling hard steel - pick 410 or carbon.
247 pieces in total: #6 x 1/2", #6 x 3/4", #8 x 1/2", #8 x 3/4", #8 x 1", and #8 x 1-1/4", in a six-compartment labeled case. The balance leans toward the sizes sheet metal jobs consume fastest.