S.T.I. (Screw Thread Insert) Taps are special taps for helical coil wire screw thread inserts, which provide positive means for protecting and strengthening tapped threads in any material.
These STI taps are correctly sized to produce an internal thread that accommodates a helical coil wire screw thread insert. The insert, in turn, will accept a screw thread of the nominal size and pitch at final assembly. Screw thread inserts provide stronger tapped threads (stronger assemblies) due to a more balanced distribution of loads throughout the length of thread engagement.
Taps are available in a wide range of sizes with us (inch and metric) in both straight and taper pipe threads.
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BA | British Association Standard Thread |
BSF | British Standard Fine Thread Series |
BSPP | British Standard Pipe (Parallel) Thread |
BSPT | British Standard Taper Pipe Thread |
BSW | British Standard Whitworth Coarse Thread Series |
M | Metric ScrewThread Series |
N | American National 8, 12 and 16 Thread Series (8N, 12N, 16N) |
N BUTT | American Buttress Screw Thread |
NC | American National Coarse Thread Series |
NEF | American National Extra Fine Thread Series |
NF | American National Fine Thread Series |
NGO | National Gas Outlet Thread |
NGT | National Gas Taper Thread (see "SGT") |
NH | American National Hose Coupling and Fire Hose Coupling Threads |
NPS | For tap marking only (See NPSC, NPSM) |
NPSC | American National Standard Straight Pipe Thread in Pipe Couplings (Tap marked NPS) |
NPSF | Dryseal American National Standard Fuel Internal Straight Pipe Thread |
NPSH | American National Standard Straight Pipe Thread for Hose Couplings |
NPSI | Dryseal American National Standard Intermediate Internal Straight Pipe Thread |
NPSL | American National Standard Straight Pipe Thread for Loose Fitting Mechanical Joints with Locknuts |
NPSM | American National Standard Straight Pipe Threads for Free-Fitting Mechanical Joints for Fixtures (Tap marked NPS) |
NPT | American National Standard Taper Pipe Thread (See ANPT, NPTR) |
NPTF | Dryseal American National Standard Taper Pipe Thread |
NPTR | American National Standard Taper Pipe Thread for Railing Joints (Tap marked NPT) |
NS | American National Thread-Special |
PTF | Dryseal SAE Short Taper Pipe Thread |
SGT | Special Gas Taper Thread |
SPL-PTF | Dryseal Special Taper Pipe Thread |
STI | Special Thread for Helical Coil Wire Screw Thread Inserts |
Stub Acme | Stub Acme Thread |
*UN | Unified Constant Pitch Thread Series |
*UNC | Unified Coarse Thread Series |
*UNEF | Unified Extra Fine Thread Series |
*UNF | Unified Fine Thread Series |
UNJ | Unified Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only. |
UNJC | Unified Coarse Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only. |
UNJF | Unified Fine Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only. |
UNM | Unified Miniature Thread Series |
UNR | Unified Constant Pitch Thread Series with a 0.108P to 0.144P Controlled Root Radius; Ext. thread only. |
UNRC | Unified Coarse Thread Series with a 0.108P to 0.144P Controlled Root Radius; Ext. thread only. |
UNRF | Unified Fine Thread Series with a 0.108P to 0.144P Controlled Root Radius; External thread only. |
*UNS | Unified Thread-Special |
V | A 60á "V" thread with Truncated Crest and Root. The theoretical "V" Form is usually flatted to the user's specifications. |
WHIT | British Standard Whitworth Special Thread |
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