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About Tapping Screws
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Steel Thread-Forming Screws for Thin Plastic
These steel screws are zinc plated to resist corrosion in wet environments. Also known as Delta PT screws, they have a round shank and more sharply angled threads than other thread-forming screws, so they require less driving torque and reduce the risk of cracking thin plastic. A Torx Plus drive allows you to apply extra force with less slippage or damage to the recess. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head, mm | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg., mm | Dia. | Ht. | Drive Size | Drill Bit Size | Approximate Thread Pitch, mm | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||||
M1 | ||||||||
| 2 | 1.875 | 0.8 | IP2, T2 | No. 67 | 0.44 | 25 | 000000000 | 000000 |
| 3 | 1.875 | 0.8 | IP2, T2 | No. 67 | 0.44 | 25 | 000000000 | 00000 |
| 4 | 1.875 | 0.8 | IP2, T2 | No. 67 | 0.44 | 25 | 000000000 | 00000 |
M1.2 | ||||||||
| 2 | 2.175 | 0.95 | IP3, T3 | No. 62 | 0.51 | 25 | 000000000 | 00000 |
| 3 | 2.175 | 0.95 | IP3, T3 | No. 62 | 0.51 | 25 | 000000000 | 00000 |
| 4 | 2.175 | 0.95 | IP3, T3 | No. 62 | 0.51 | 25 | 000000000 | 00000 |
| 5 | 2.175 | 0.95 | IP3, T3 | No. 62 | 0.51 | 25 | 000000000 | 00000 |
M1.4 | ||||||||
| 3 | 2.35 | 1.15 | IP3, T3 | No. 56 | 0.57 | 25 | 000000000 | 0000 |
| 4 | 2.35 | 1.15 | IP3, T3 | No. 56 | 0.57 | 25 | 000000000 | 0000 |
| 5 | 2.35 | 1.15 | IP3, T3 | No. 56 | 0.57 | 25 | 000000000 | 0000 |
| 6 | 2.35 | 1.15 | IP3, T3 | No. 56 | 0.57 | 25 | 000000000 | 0000 |
M1.6 | ||||||||
| 3 | 2.75 | 1.2 | IP5, T5 | No. 55 | 0.64 | 25 | 000000000 | 0000 |
| 4 | 2.75 | 1.2 | IP5, T5 | No. 55 | 0.64 | 25 | 000000000 | 0000 |
| 5 | 2.75 | 1.2 | IP5, T5 | No. 55 | 0.64 | 25 | 000000000 | 0000 |
| 6 | 2.75 | 1.2 | IP5, T5 | No. 55 | 0.64 | 25 | 000000000 | 0000 |
M1.8 | ||||||||
| 3 | 3.05 | 1.35 | IP6, T6 | No. 54 | 0.71 | 25 | 000000000 | 0000 |
| 4 | 3.05 | 1.35 | IP6, T6 | No. 54 | 0.71 | 25 | 000000000 | 0000 |
| 5 | 3.05 | 1.35 | IP6, T6 | No. 54 | 0.71 | 25 | 000000000 | 0000 |
| 6 | 3.05 | 1.35 | IP6, T6 | No. 54 | 0.71 | 25 | 000000000 | 0000 |
M2 | ||||||||
| 3 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
| 4 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
| 5 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
| 6 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
| 8 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
M2.2 | ||||||||
| 4 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
| 5 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
| 6 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
| 8 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
| 10 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
M2.5 | ||||||||
| 5 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
| 6 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
| 8 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
| 10 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
| 12 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
M3 | ||||||||
| 5 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
| 6 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
| 8 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
| 10 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
| 12 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
M3.5 | ||||||||
| 6 | 5.92 | 2.7 | IP15, T15 | No. 34 | 1.29 | 25 | 000000000 | 0000 |
| 10 | 5.92 | 2.7 | IP15, T15 | No. 34 | 1.29 | 25 | 000000000 | 0000 |
| 12 | 5.92 | 2.7 | IP15, T15 | No. 34 | 1.29 | 25 | 000000000 | 0000 |
M4 | ||||||||
| 8 | 6.82 | 3.1 | IP20, T20 | No. 30 | 1.46 | 25 | 000000000 | 0000 |
| 10 | 6.82 | 3.1 | IP20, T20 | No. 30 | 1.46 | 25 | 000000000 | 0000 |
| 12 | 6.82 | 3.1 | IP20, T20 | No. 30 | 1.46 | 25 | 000000000 | 0000 |
| 14 | 6.82 | 3.1 | IP20, T20 | No. 30 | 1.46 | 25 | 000000000 | 0000 |
M4.5 | ||||||||
| 8 | 7.5 | 3.35 | IP20, T20 | No. 27 | 1.63 | 25 | 000000000 | 0000 |
| 10 | 7.5 | 3.35 | IP20, T20 | No. 27 | 1.63 | 25 | 000000000 | 0000 |
| 12 | 7.5 | 3.35 | IP20, T20 | No. 27 | 1.63 | 25 | 000000000 | 0000 |
| 14 | 7.5 | 3.35 | IP20, T20 | No. 27 | 1.63 | 25 | 000000000 | 0000 |
M5 | ||||||||
| 10 | 8.62 | 3.5 | IP25, T25 | No. 21 | 1.8 | 25 | 000000000 | 0000 |
| 12 | 8.62 | 3.5 | IP25, T25 | No. 21 | 1.8 | 25 | 000000000 | 0000 |
M6 | ||||||||
| 12 | 10.5 | 4.35 | IP30, T30 | No. 12 | 2.14 | 25 | 000000000 | 0000 |
| 14 | 10.5 | 4.35 | IP30, T30 | No. 12 | 2.14 | 25 | 000000000 | 00000 |
Stainless Steel Thread-Forming Screws for Thin Plastic
18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. Also known as Delta PT screws, they have a round shank and more sharply angled threads than other thread-forming screws, so they require less driving torque and reduce the risk of cracking thin plastic. A Torx Plus drive allows you to apply extra force with less slippage or damage to the recess. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head, mm | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg., mm | Dia. | Ht. | Drive Size | Drill Bit Size | Approximate Thread Pitch, mm | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
M1 | ||||||||
| 2 | 1.875 | 0.8 | IP2, T2 | No. 67 | 0.44 | 25 | 000000000 | 000000 |
| 3 | 1.875 | 0.8 | IP2, T2 | No. 67 | 0.44 | 25 | 000000000 | 00000 |
| 4 | 1.875 | 0.8 | IP2, T2 | No. 67 | 0.44 | 25 | 000000000 | 00000 |
M1.2 | ||||||||
| 2 | 2.175 | 0.95 | IP3, T3 | No. 62 | 0.51 | 25 | 000000000 | 00000 |
| 3 | 2.175 | 0.95 | IP3, T3 | No. 62 | 0.51 | 25 | 000000000 | 00000 |
| 4 | 2.175 | 0.95 | IP3, T3 | No. 62 | 0.51 | 25 | 000000000 | 00000 |
| 5 | 2.175 | 0.95 | IP3, T3 | No. 62 | 0.51 | 25 | 000000000 | 00000 |
M1.4 | ||||||||
| 3 | 2.35 | 1.15 | IP3, T3 | No. 56 | 0.57 | 25 | 000000000 | 0000 |
| 4 | 2.35 | 1.15 | IP3, T3 | No. 56 | 0.57 | 25 | 000000000 | 0000 |
| 5 | 2.35 | 1.15 | IP3, T3 | No. 56 | 0.57 | 25 | 000000000 | 0000 |
| 6 | 2.35 | 1.15 | IP3, T3 | No. 56 | 0.57 | 25 | 000000000 | 0000 |
M1.6 | ||||||||
| 3 | 2.75 | 1.2 | IP5, T5 | No. 55 | 0.64 | 25 | 000000000 | 0000 |
| 4 | 2.75 | 1.2 | IP5, T5 | No. 55 | 0.64 | 25 | 000000000 | 0000 |
| 5 | 2.75 | 1.2 | IP5, T5 | No. 55 | 0.64 | 25 | 000000000 | 0000 |
| 6 | 2.75 | 1.2 | IP5, T5 | No. 55 | 0.64 | 25 | 000000000 | 0000 |
M1.8 | ||||||||
| 3 | 3.05 | 1.35 | IP6, T6 | No. 54 | 0.71 | 25 | 000000000 | 0000 |
| 4 | 3.05 | 1.35 | IP6, T6 | No. 54 | 0.71 | 25 | 000000000 | 0000 |
| 5 | 3.05 | 1.35 | IP6, T6 | No. 54 | 0.71 | 25 | 000000000 | 0000 |
| 6 | 3.05 | 1.35 | IP6, T6 | No. 54 | 0.71 | 25 | 000000000 | 0000 |
M2 | ||||||||
| 3 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
| 4 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
| 5 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
| 6 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
| 8 | 3.35 | 1.6 | IP6, T6 | No. 52 | 0.78 | 25 | 000000000 | 0000 |
M2.2 | ||||||||
| 4 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
| 5 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
| 6 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
| 8 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
| 10 | 3.75 | 1.6 | IP6, T6 | No. 50 | 0.85 | 25 | 000000000 | 0000 |
M2.5 | ||||||||
| 5 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
| 6 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
| 8 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
| 10 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
| 12 | 4.25 | 1.9 | IP8, T8 | No. 45 | 0.95 | 25 | 000000000 | 0000 |
M3 | ||||||||
| 5 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
| 6 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
| 8 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
| 10 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
| 12 | 5.15 | 2.3 | IP10, T10 | No. 41 | 1.12 | 25 | 000000000 | 0000 |
M3.5 | ||||||||
| 6 | 5.92 | 2.7 | IP15, T15 | No. 34 | 1.29 | 25 | 000000000 | 0000 |
| 10 | 5.92 | 2.7 | IP15, T15 | No. 34 | 1.29 | 25 | 000000000 | 0000 |
| 12 | 5.92 | 2.7 | IP15, T15 | No. 34 | 1.29 | 25 | 000000000 | 0000 |
M4 | ||||||||
| 8 | 6.82 | 3.1 | IP20, T20 | No. 30 | 1.46 | 25 | 000000000 | 0000 |
| 10 | 6.82 | 3.1 | IP20, T20 | No. 30 | 1.46 | 25 | 000000000 | 0000 |
| 12 | 6.82 | 3.1 | IP20, T20 | No. 30 | 1.46 | 25 | 000000000 | 0000 |
| 14 | 6.82 | 3.1 | IP20, T20 | No. 30 | 1.46 | 25 | 000000000 | 0000 |
M4.5 | ||||||||
| 8 | 7.5 | 3.35 | IP20, T20 | No. 27 | 1.63 | 25 | 000000000 | 0000 |
| 10 | 7.5 | 3.35 | IP20, T20 | No. 27 | 1.63 | 25 | 000000000 | 0000 |
| 12 | 7.5 | 3.35 | IP20, T20 | No. 27 | 1.63 | 25 | 000000000 | 00000 |
| 14 | 7.5 | 3.35 | IP20, T20 | No. 27 | 1.63 | 25 | 000000000 | 00000 |
M5 | ||||||||
| 10 | 8.62 | 3.5 | IP25, T25 | No. 21 | 1.8 | 25 | 000000000 | 00000 |
| 12 | 8.62 | 3.5 | IP25, T25 | No. 21 | 1.8 | 25 | 000000000 | 00000 |
M6 | ||||||||
| 12 | 10.5 | 4.35 | IP30, T30 | No. 12 | 2.14 | 25 | 000000000 | 00000 |
| 14 | 10.5 | 4.35 | IP30, T30 | No. 12 | 2.14 | 25 | 000000000 | 00000 |