Metallics JSTS25 10 x 2 in. Pan Head Slotted Tapping Screws - 18-8 Stainless - Each

Mechanically yes, but be aware of the corrosion risk. Metallics notes that fastening 18-8 stainless parts to aluminum or steel can set up a galvanic couple in some environments. For wet, coastal, or exterior work that pairing can corrode the aluminum or steel around the screw. Indoors and dry, it is common practice. If the assembly is exposed, isolate the joint or use a fastener that matches the base metal.

It is a Type A tapping screw with a gimlet point, which is the sheet metal thread form meant to cut its own thread as it drives. The gimlet point starts in a punched or drilled pilot hole in thin sheet, so it is not a self-drilling screw. Drill or punch the sheet first, then drive the screw.

No. The JSTS25 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. On federally funded work with domestic sourcing language, these will not satisfy the requirement.

12 threads per inch, to the ASME B18.6.4 thread standard for tapping screws. Length is 2 inches in a #10 diameter. That coarse 12 TPI Type A thread is what lets it bite in sheet metal rather than tap a machine thread.

48 lb-in minimum torsional strength. That is the driving limit, and slotted stainless is easy to overdrive with an impact gun, so run a clutch driver or drive it by hand. Stripping the slot or snapping the shank in a finished panel is the usual failure, not pullout.

Pan head, 0.357 to 0.373 in. across and 0.099 to 0.11 in. tall. A pan head bears on the surface rather than countersinking, so it needs a flat seat and leaves about a tenth of an inch of head standing proud. If the fastener must finish flush in a plate or trim, a pan head is the wrong head style.

They ship in a jar, with a minimum of 100 per jar. Jar weight is 1.23 lbs. For MRO stockrooms that is one shelf unit per size, which is why these get standardized across a facility rather than bought by the handful.

Slotted drive, with a slot 0.05 to 0.06 in. wide and 0.053 to 0.068 in. deep. Use a flat blade tip sized close to 0.06 in. thick and as wide as the head so it fills the slot. A narrow or worn tip in stainless will cam out and chew the slot.

Head and slot dimensions follow ASME B18.6.3-2013, and the tapping thread follows ASME B18.6.4. That pairing is what a submittal reviewer looks for on a #10 slotted pan head Type A screw. Note that for #9 diameter screws in the same family the dimensions are independent of ASME B18.6.4.

Metallics lists this screw for the electrical, plumbing, and heating and air conditioning trades. Typical work is mounting boxes, straps, hangers, duct accessories, and panel trim into sheet metal where the stainless is wanted for corrosion resistance. The 2 inch length gives enough reach to pass through insulation or a standoff before it engages the sheet.

The JSTS series runs other diameters and lengths, and other pack quantities, by request. The JSTS25 itself is fixed at #10 diameter by 2 inches, pan head slotted, 18-8 stainless, so if you need a shorter screw for thin sheet, ask for the alternate size rather than cutting this one down.