PT-Style Screws | McMaster-Carr

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About Tapping Screws

These steel screws are zinc plated to resist corrosion in wet environments. 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 drive allows you to apply extra force with less slippage or damage to the recess. Length is measured from under the head.

Style A screws are also known as Delta PT® screws.

Style B screws have a flange that distributes holding pressure and reduces the risk of crushing thin plastic. They are comparable to EJOT PT screws.

For technical drawings and 3-D models, click on a part number.

Style A Screws

Torx-Plus Drive

	Head, mm		Drive
Lg., mm	Dia.	Ht.	Size	Style	Drill Bit Size	Approximate Thread Pitch, mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M1
2	1.875	0.8	IP2, T2	Torx Plus	No. 67	0.44	25	000000000	000000
3	1.875	0.8	IP2, T2	Torx Plus	No. 67	0.44	25	000000000	00000
4	1.875	0.8	IP2, T2	Torx Plus	No. 67	0.44	25	000000000	00000
M1.2
2	2.175	0.95	IP3, T3	Torx Plus	No. 62	0.51	25	000000000	00000
3	2.175	0.95	IP3, T3	Torx Plus	No. 62	0.51	25	000000000	00000
4	2.175	0.95	IP3, T3	Torx Plus	No. 62	0.51	25	000000000	00000
5	2.175	0.95	IP3, T3	Torx Plus	No. 62	0.51	25	000000000	00000
M1.4
3	2.35	1.15	IP3, T3	Torx Plus	No. 56	0.57	25	000000000	0000
4	2.35	1.15	IP3, T3	Torx Plus	No. 56	0.57	25	000000000	0000
5	2.35	1.15	IP3, T3	Torx Plus	No. 56	0.57	25	000000000	0000
6	2.35	1.15	IP3, T3	Torx Plus	No. 56	0.57	25	000000000	0000
M1.6
3	2.75	1.2	IP5, T5	Torx Plus	No. 55	0.64	25	000000000	0000
4	2.75	1.2	IP5, T5	Torx Plus	No. 55	0.64	25	000000000	0000
5	2.75	1.2	IP5, T5	Torx Plus	No. 55	0.64	25	000000000	0000
6	2.75	1.2	IP5, T5	Torx Plus	No. 55	0.64	25	000000000	0000
M1.8
4	3.05	1.35	IP6, T6	Torx Plus	No. 54	0.71	25	000000000	0000
5	3.05	1.35	IP6, T6	Torx Plus	No. 54	0.71	25	000000000	0000
6	3.05	1.35	IP6, T6	Torx Plus	No. 54	0.71	25	000000000	0000
M2
3	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	0000
4	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	0000
5	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	0000
6	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	0000
8	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	0000
M2.2
4	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
5	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
6	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
8	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
10	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
M2.5
5	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	0000
6	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	0000
8	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	0000
10	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	0000
12	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	0000
M3
5	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	0000
6	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	0000
8	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	0000
10	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	0000
12	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	0000
M3.5
6	5.92	2.7	IP15, T15	Torx Plus	No. 34	1.29	25	000000000	0000
10	5.92	2.7	IP15, T15	Torx Plus	No. 34	1.29	25	000000000	0000
12	5.92	2.7	IP15, T15	Torx Plus	No. 34	1.29	25	000000000	0000
M4
8	6.82	3.1	IP20, T20	Torx Plus	No. 30	1.46	25	000000000	0000
10	6.82	3.1	IP20, T20	Torx Plus	No. 30	1.46	25	000000000	0000
12	6.82	3.1	IP20, T20	Torx Plus	No. 30	1.46	25	000000000	0000
14	6.82	3.1	IP20, T20	Torx Plus	No. 30	1.46	25	000000000	00000
M4.5
8	7.5	3.35	IP20, T20	Torx Plus	No. 27	1.63	25	000000000	0000
10	7.5	3.35	IP20, T20	Torx Plus	No. 27	1.63	25	000000000	0000
12	7.5	3.35	IP20, T20	Torx Plus	No. 27	1.63	25	000000000	00000
14	7.5	3.35	IP20, T20	Torx Plus	No. 27	1.63	25	000000000	00000
M5
10	8.62	3.5	IP25, T25	Torx Plus	No. 21	1.8	25	000000000	00000
12	8.62	3.5	IP25, T25	Torx Plus	No. 21	1.8	25	000000000	00000
M6
12	10.5	4.35	IP30, T30	Torx Plus	No. 12	2.14	25	000000000	00000
14	10.5	4.35	IP30, T30	Torx Plus	No. 12	2.14	25	000000000	00000

Style B Screws

Torx Drive

			Drive
Lg., mm	Flange Diameter, mm	Head Ht., mm	Size	Style	Drill Bit Size	Approximate Thread Pitch, mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M2
4	4	1.3	T6	Torx	58	0.89	25	000000000	00000
6	4	1.3	T6	Torx	58	0.89	25	000000000	0000
8	4	1.3	T6	Torx	58	0.89	25	000000000	0000
M2.2
4	4.5	1.4	T6	Torx	56	0.98	25	000000000	0000
6	4.5	1.4	T6	Torx	56	0.98	25	000000000	0000
M2.5
6	5	1.5	T8	Torx	54	1.12	50	000000000	00000
8	5	1.5	T8	Torx	54	1.12	50	000000000	00000
10	5	1.5	T8	Torx	54	1.12	50	000000000	00000
M3
8	6	2.1	T10	Torx	52	1.34	100	000000000	00000
10	6	2.1	T10	Torx	52	1.34	100	000000000	00000
12	6	2.1	T10	Torx	52	1.34	100	000000000	00000
M3.5
8	7	2.4	T10	Torx	50	1.57	100	000000000	00000
10	7	2.4	T10	Torx	50	1.57	100	000000000	00000
12	7	2.4	T10	Torx	50	1.57	50	000000000	0000
M4
10	8	2.6	T20	Torx	45	1.79	50	000000000	0000
12	8	2.6	T20	Torx	45	1.79	50	000000000	0000
16	8	2.6	T20	Torx	45	1.79	50	000000000	00000
M5
10	10	3.3	T20	Torx	38	2.24	50	000000000	00000
12	10	3.3	T20	Torx	38	2.24	50	000000000	00000

Stainless Steel Thread-Forming Screws for Thin Plastic

18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. 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 drive allows you to apply extra force with less slippage or damage to the recess.

Pan head screws are also known as Delta PT® screws. Length is measured from under the head.

Round head screws have a flange under the head that distributes holding pressure and reduces the risk of crushing thin plastic. They’re comparable to EJOT PT screws. Length is measured from under the flange.

For technical drawings and 3-D models, click on a part number.

Pan Head Screws

Pan Head

Torx-Plus Drive

	Head, mm		Drive
Lg., mm	Dia.	Ht.	Size	Style	Drill Bit Size	Approximate Thread Pitch, mm	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M1
3	1.875	0.8	IP2, T2	Torx Plus	No. 67	0.44	25	000000000	000000
4	1.875	0.8	IP2, T2	Torx Plus	No. 67	0.44	25	000000000	00000
M1.2
2	2.175	0.95	IP3, T3	Torx Plus	No. 62	0.51	25	000000000	00000
3	2.175	0.95	IP3, T3	Torx Plus	No. 62	0.51	25	000000000	00000
4	2.175	0.95	IP3, T3	Torx Plus	No. 62	0.51	25	000000000	00000
5	2.175	0.95	IP3, T3	Torx Plus	No. 62	0.51	25	000000000	00000
M1.4
3	2.35	1.15	IP3, T3	Torx Plus	No. 56	0.57	25	000000000	00000
4	2.35	1.15	IP3, T3	Torx Plus	No. 56	0.57	25	000000000	00000
5	2.35	1.15	IP3, T3	Torx Plus	No. 56	0.57	25	000000000	00000
6	2.35	1.15	IP3, T3	Torx Plus	No. 56	0.57	25	000000000	00000
M1.6
3	2.75	1.2	IP5, T5	Torx Plus	No. 55	0.64	25	000000000	0000
4	2.75	1.2	IP5, T5	Torx Plus	No. 55	0.64	25	000000000	0000
5	2.75	1.2	IP5, T5	Torx Plus	No. 55	0.64	25	000000000	0000
6	2.75	1.2	IP5, T5	Torx Plus	No. 55	0.64	25	000000000	00000
M1.8
3	3.05	1.35	IP6, T6	Torx Plus	No. 54	0.71	25	000000000	0000
4	3.05	1.35	IP6, T6	Torx Plus	No. 54	0.71	25	000000000	0000
5	3.05	1.35	IP6, T6	Torx Plus	No. 54	0.71	25	000000000	00000
6	3.05	1.35	IP6, T6	Torx Plus	No. 54	0.71	25	000000000	00000
M2
3	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	00000
4	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	00000
5	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	00000
6	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	00000
8	3.35	1.6	IP6, T6	Torx Plus	No. 52	0.78	25	000000000	00000
M2.2
4	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
5	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
6	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
8	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	0000
10	3.75	1.6	IP6, T6	Torx Plus	No. 50	0.85	25	000000000	00000
M2.5
5	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	0000
6	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	0000
8	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	0000
10	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	00000
12	4.25	1.9	IP8, T8	Torx Plus	No. 45	0.95	25	000000000	00000
M3
5	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	0000
6	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	0000
8	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	00000
10	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	00000
12	5.15	2.3	IP10, T10	Torx Plus	No. 41	1.12	25	000000000	00000
M3.5
6	5.92	2.7	IP15, T15	Torx Plus	No. 34	1.29	25	000000000	00000
10	5.92	2.7	IP15, T15	Torx Plus	No. 34	1.29	25	000000000	00000
12	5.92	2.7	IP15, T15	Torx Plus	No. 34	1.29	25	000000000	00000
M4
8	6.82	3.1	IP20, T20	Torx Plus	No. 30	1.46	25	000000000	00000
10	6.82	3.1	IP20, T20	Torx Plus	No. 30	1.46	25	000000000	00000
12	6.82	3.1	IP20, T20	Torx Plus	No. 30	1.46	25	000000000	00000
14	6.82	3.1	IP20, T20	Torx Plus	No. 30	1.46	25	000000000	00000
M4.5
8	7.5	3.35	IP20, T20	Torx Plus	No. 27	1.63	25	000000000	00000
10	7.5	3.35	IP20, T20	Torx Plus	No. 27	1.63	25	000000000	00000
12	7.5	3.35	IP20, T20	Torx Plus	No. 27	1.63	25	000000000	00000
14	7.5	3.35	IP20, T20	Torx Plus	No. 27	1.63	25	000000000	00000
M5
10	8.62	3.5	IP25, T25	Torx Plus	No. 21	1.8	25	000000000	00000
12	8.62	3.5	IP25, T25	Torx Plus	No. 21	1.8	25	000000000	00000
M6
12	10.5	4.35	IP30, T30	Torx Plus	No. 12	2.14	25	000000000	00000
14	10.5	4.35	IP30, T30	Torx Plus	No. 12	2.14	25	000000000	00000

Round Head Screws with Flange

Round Head with Flange

Torx Drive

			Drive
Lg., mm	Flange Diameter, mm	Head Ht., mm	Size	Style	Drill Bit Size	Approximate Thread Pitch, mm	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M1.6
5	3.6	1.3	T5	Torx	56	0.67	25	000000000	00000
6	3.6	1.3	T5	Torx	56	0.67	25	000000000	0000
8	3.6	1.3	T5	Torx	56	0.67	25	000000000	0000
M2
4	4	1.3	T6	Torx	58	0.89	25	000000000	0000
5	4	1.3	T6	Torx	58	0.89	25	000000000	0000
6	4	1.3	T6	Torx	58	0.89	25	000000000	0000
8	4	1.3	T6	Torx	58	0.89	25	000000000	0000
M2.2
4	4.5	1.4	T6	Torx	56	0.98	25	000000000	0000
5	4.5	1.4	T6	Torx	56	0.98	50	000000000	00000
6	4.5	1.4	T6	Torx	56	0.98	25	000000000	0000
8	4.5	1.4	T6	Torx	56	0.98	25	000000000	0000
M2.5
5	5	1.5	T8	Torx	54	1.12	50	000000000	00000
6	5	1.5	T8	Torx	54	1.12	25	000000000	0000
8	5	1.5	T8	Torx	54	1.12	25	000000000	0000
10	5	1.5	T8	Torx	54	1.12	50	000000000	00000
12	5	1.5	T8	Torx	54	1.12	50	000000000	00000
M3
5	6	2.1	T10	Torx	52	1.34	50	000000000	00000
6	6	2.1	T10	Torx	52	1.34	50	000000000	00000
8	6	2.1	T10	Torx	52	1.34	50	000000000	00000
10	6	2.1	T10	Torx	52	1.34	50	000000000	00000
12	6	2.1	T10	Torx	52	1.34	50	000000000	00000
M3.5
10	7	2.4	T10	Torx	50	1.57	25	000000000	0000
12	7	2.4	T10	Torx	50	1.57	25	000000000	0000
14	7	2.4	T10	Torx	50	1.57	25	000000000	00000
M4
8	8	2.6	T20	Torx	45	1.79	25	000000000	0000
10	8	2.6	T20	Torx	45	1.79	25	000000000	00000
12	8	2.6	T20	Torx	45	1.79	25	000000000	00000
14	8	2.6	T20	Torx	45	1.79	25	000000000	00000
M5
10	10	3.3	T20	Torx	38	2.24	25	000000000	00000
12	10	3.3	T20	Torx	38	2.24	25	000000000	00000

18-8 Stainless Steel Phillips Rounded Head Thread-Forming Screws for Plastic

These 18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head.

Metric-size screws are comparable to PT screws. All have a round shank and more sharply angled threads than those with a tri-lobe shank for a tight, even hold with minimal radial expansion and stress in plastic holes. They also have a recessed thread root for good material flow, so they require less driving torque and reduce the risk of cracking mating plastic. You can reuse them.

For technical drawings and 3-D models, click on a part number.

18-8 Stainless Steel—Metric

Round Shank
Cross
Section

	Head, mm
Lg., mm	Dia.	Ht.	Drive Size	Drill Bit Size	Approximate Thread Pitch, mm	Threading	Shank Cross Section	Pkg. Qty.		Pkg.
M1.6
5	2.6	1.1	No. 0	No. 55	0.67	Fully Threaded	Round	25	000000000	00000
6	2.6	1.1	No. 0	No. 55	0.67	Fully Threaded	Round	25	000000000	0000
8	2.6	1.1	No. 0	No. 55	0.67	Fully Threaded	Round	25	000000000	0000
M2
5	3.5	1.4	No. 1	No. 52	0.89	Fully Threaded	Round	25	000000000	0000
6	3.5	1.4	No. 1	No. 52	0.89	Fully Threaded	Round	25	000000000	0000
8	3.5	1.4	No. 1	No. 52	0.89	Fully Threaded	Round	25	000000000	0000
10	3.5	1.4	No. 1	No. 52	0.89	Fully Threaded	Round	25	000000000	0000
M2.2
4	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	50	000000000	0000
5	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	100	000000000	00000
6	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	100	000000000	00000
8	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	50	000000000	0000
10	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	100	000000000	00000
12	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	100	000000000	00000
14	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	100	000000000	00000
16	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	100	000000000	00000
18	3.9	1.6	No. 1	No. 50	0.98	Fully Threaded	Round	50	000000000	00000
M2.5
5	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	100	000000000	00000
6	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	100	000000000	00000
8	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	100	000000000	00000
10	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	50	000000000	0000
12	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	50	000000000	0000
14	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	50	000000000	0000
16	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	50	000000000	0000
18	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	50	000000000	0000
20	4.4	1.8	No. 1	No. 45	1.12	Fully Threaded	Round	50	000000000	00000
M3
5	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	0000
6	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	100	000000000	00000
8	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	0000
10	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	0000
12	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	0000
14	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	0000
16	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	0000
18	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	00000
20	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	00000
25	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	00000
30	5.3	2.1	No. 1	No. 41	1.34	Fully Threaded	Round	50	000000000	00000
M3.5
8	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	50	000000000	0000
10	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	50	000000000	0000
12	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	50	000000000	0000
14	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	50	000000000	0000
16	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	50	000000000	00000
18	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	50	000000000	00000
20	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	50	000000000	00000
25	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	50	000000000	00000
30	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	25	000000000	0000
35	6.1	2.6	No. 1	No. 34	1.57	Fully Threaded	Round	25	000000000	0000
M4
5	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	25	000000000	0000
6	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	25	000000000	0000
8	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	50	000000000	0000
10	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	50	000000000	0000
12	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	50	000000000	00000
14	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	50	000000000	00000
16	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	50	000000000	00000
18	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	50	000000000	00000
20	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	25	000000000	0000
25	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	25	000000000	0000
30	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	25	000000000	0000
35	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	25	000000000	00000
40	7	2.8	No. 1	No. 30	1.79	Fully Threaded	Round	10	000000000	0000
M5
8	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	25	000000000	00000
10	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	25	000000000	00000
12	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	25	000000000	00000
14	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	25	000000000	00000
16	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	10	000000000	0000
18	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	10	000000000	0000
20	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	10	000000000	0000
25	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	10	000000000	0000
30	8.8	3.32	No. 2	No. 21	2.24	Fully Threaded	Round	10	000000000	0000

Steel Phillips Rounded Head Thread-Forming Screws for Plastic

Round Shank
Cross
Section

Length is measured from under the head.

Metric-size screws are comparable to PT screws. All have a round shank and more sharply angled threads than those with a tri-lobe shank, so they require less driving torque and reduce the risk of cracking mating plastic. They also have a recessed thread root that creates a tight hold. You can reuse them.

Zinc-plated steel screws resist corrosion in wet environments.

For technical drawings and 3-D models, click on a part number.

	Head
Lg.	Dia.	Ht.	Drive Size	Drill Bit Size	Approximate Thread Pitch	Shank Cross Section	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M1.6
4mm	2.6mm	1.1mm	No. 0	1.2 mm	0.67 mm	Round	25	000000000	00000
5mm	2.6mm	1.1mm	No. 0	1.2 mm	0.67 mm	Round	50	000000000	00000
6mm	2.6mm	1.1mm	No. 0	1.2 mm	0.67 mm	Round	50	000000000	00000
M2
4mm	3.5mm	1.4mm	No. 1	1.5 mm	0.89 mm	Round	25	000000000	0000
5mm	3.5mm	1.4mm	No. 1	1.5 mm	0.89 mm	Round	50	000000000	0000
6mm	3.5mm	1.4mm	No. 1	1.5 mm	0.89 mm	Round	50	000000000	0000
8mm	3.5mm	1.4mm	No. 1	1.5 mm	0.89 mm	Round	100	000000000	00000
10mm	3.5mm	1.4mm	No. 1	1.5 mm	0.89 mm	Round	50	000000000	0000
M2.2
5mm	3.9mm	1.6mm	No. 1	1.65 mm	0.98 mm	Round	100	000000000	0000
6mm	3.9mm	1.6mm	No. 1	1.65 mm	0.98 mm	Round	100	000000000	00000
8mm	3.9mm	1.6mm	No. 1	1.65 mm	0.98 mm	Round	100	000000000	00000
10mm	3.9mm	1.6mm	No. 1	1.65 mm	0.98 mm	Round	100	000000000	0000
12mm	3.9mm	1.6mm	No. 1	1.65 mm	0.98 mm	Round	100	000000000	0000
14mm	3.9mm	1.6mm	No. 1	1.65 mm	0.98 mm	Round	100	000000000	0000
16mm	3.9mm	1.6mm	No. 1	1.65 mm	0.98 mm	Round	100	000000000	0000
M2.5
5mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	0000
6mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	00000
8mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	0000
10mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	0000
12mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	0000
14mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	00000
16mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	00000
18mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	00000
20mm	4.4mm	1.8mm	No. 1	1.85 mm	1.12 mm	Round	100	000000000	00000
M3
5mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	0000
6mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	0000
8mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	0000
10mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	00000
12mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	0000
14mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	00000
16mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	00000
18mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	00000
20mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	100	000000000	00000
25mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	50	000000000	0000
30mm	5.3mm	2.1mm	No. 1	2.25 mm	1.34 mm	Round	50	000000000	0000
M3.5
5mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	100	000000000	0000
6mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	100	000000000	0000
8mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
10mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	100	000000000	00000
12mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
14mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
16mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
18mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
20mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
25mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
30mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
35mm	6.1mm	2.6mm	No. 2	2.6 mm	1.57 mm	Round	50	000000000	0000
M4
5mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	100	000000000	00000
6mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	100	000000000	0000
8mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	100	000000000	00000
10mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
12mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
14mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
16mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
18mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
20mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
25mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
30mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
35mm	7mm	2.8mm	No. 2	3 mm	1.79 mm	Round	50	000000000	0000
M5
8mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	50	000000000	0000
10mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	50	000000000	0000
12mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	50	000000000	00000
14mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	50	000000000	0000
16mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	50	000000000	0000
18mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	50	000000000	00000
20mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	50	000000000	00000
25mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	25	000000000	0000
30mm	8.8mm	3.32mm	No. 2	3.75 mm	2.24 mm	Round	25	000000000	0000

Steel Flat Head Thread-Forming Screws for Plastic

These steel screws are beveled under the head for use in countersunk holes. Length is measured from the top of the head.

Zinc-plated steel screws resist corrosion in wet environments.

For technical drawings and 3-D models, click on a part number.

Torx Drive

Torx Drive with 90° Countersink Angle

		Head
Screw Size	Lg.	Dia.	Ht.	Drive Size	Drill Bit Size	Approximate Thread Pitch	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M1.6	4mm	3.3mm	0.96mm	T5	1.2 mm	0.67mm	25	000000000	00000
M1.6	5mm	3.3mm	0.96mm	T5	1.2 mm	0.67mm	25	000000000	0000
M1.6	6mm	3.3mm	0.96mm	T5	1.2 mm	0.67mm	25	000000000	0000
M1.6	8mm	3.3mm	0.96mm	T5	1.2 mm	0.67mm	25	000000000	0000
M2	4mm	3.8mm	1.36mm	T6	1.5 mm	0.89mm	25	000000000	0000
M2	5mm	3.8mm	1.36mm	T6	1.5 mm	0.89mm	25	000000000	0000
M2	6mm	3.8mm	1.36mm	T6	1.5 mm	0.89mm	25	000000000	0000
M2	8mm	3.8mm	1.36mm	T6	1.5 mm	0.89mm	50	000000000	0000
M2.2	5mm	3.8mm	1.2mm	T8	1.65 mm	0.98mm	50	000000000	00000
M2.2	10mm	3.8mm	1.2mm	T6	1.65 mm	0.98mm	100	000000000	00000
M2.5	6mm	4.7mm	1.7mm	T8	1.85 mm	1.12mm	100	000000000	00000
M2.5	8mm	4.7mm	1.7mm	T8	1.85 mm	1.12mm	100	000000000	00000
M2.5	10mm	4.7mm	1.7mm	T8	1.85 mm	1.12mm	100	000000000	00000
M3	8mm	5.5mm	1.8mm	T8	2.25 mm	1.34mm	100	000000000	00000
M3	10mm	5.5mm	1.8mm	T8	2.25 mm	1.34mm	100	000000000	00000
M3	12mm	5.5mm	1.8mm	T8	2.25 mm	1.34mm	100	000000000	00000
M3	16mm	5.5mm	1.8mm	T8	2.25 mm	1.34mm	100	000000000	00000
M3.5	10mm	7.3mm	2.5mm	T15	2.6 mm	1.57mm	100	000000000	00000
M3.5	12mm	7.3mm	2.5mm	T15	2.6 mm	1.57mm	100	000000000	00000
M5	10mm	9.3mm	3.6mm	T20	3.75 mm	2.24mm	50	000000000	0000
M5	12mm	9.3mm	3.6mm	T20	3.75 mm	2.24mm	50	000000000	0000
M5	14mm	9.3mm	3.6mm	T20	3.75 mm	2.24mm	50	000000000	00000
M5	16mm	9.3mm	3.6mm	T20	3.75 mm	2.24mm	50	000000000	00000
M5	18mm	9.3mm	3.6mm	T20	3.75 mm	2.24mm	50	000000000	00000

Phillips Drive

Phillips Drive with 90° Countersink Angle

		Head
Screw Size	Lg.	Dia.	Ht.	Drive Size	Drill Bit Size	Approximate Thread Pitch	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M1.6	4mm	3.3mm	0.96mm	No. 0	1.2 mm	0.67mm	25	000000000	00000
M1.6	5mm	3.3mm	0.96mm	No. 0	1.2 mm	0.67mm	25	000000000	0000
M2	4mm	3.8mm	1.2mm	No. 0	1.5 mm	0.89mm	25	000000000	0000
M2	5mm	3.8mm	1.2mm	No. 0	1.5 mm	0.89mm	25	000000000	0000
M2	6mm	3.8mm	1.2mm	No. 0	1.5 mm	0.89mm	25	000000000	0000
M2	10mm	3.8mm	1.2mm	No. 0	1.5 mm	0.89mm	25	000000000	0000
M2.2	5mm	3.8mm	1.2mm	No. 0	1.65 mm	0.98mm	50	000000000	00000
M2.2	16mm	3.8mm	1.2mm	No. 0	1.65 mm	0.98mm	100	000000000	00000
M2.5	8mm	4.7mm	1.7mm	No. 1	1.85 mm	1.12mm	100	000000000	00000
M2.5	10mm	4.7mm	1.7mm	No. 1	1.85 mm	1.12mm	100	000000000	00000
M2.5	12mm	4.7mm	1.7mm	No. 1	1.85 mm	1.12mm	100	000000000	00000
M3	8mm	5.5mm	1.8mm	No. 1	2.25 mm	1.34mm	100	000000000	00000
M3	10mm	5.5mm	1.8mm	No. 1	2.25 mm	1.34mm	100	000000000	00000
M3	12mm	5.5mm	1.8mm	No. 1	2.25 mm	1.34mm	100	000000000	00000
M3	14mm	5.5mm	1.8mm	No. 1	2.25 mm	1.34mm	100	000000000	00000
M3	16mm	5.5mm	1.8mm	No. 1	2.25 mm	1.34mm	100	000000000	00000
M3	20mm	5.5mm	1.8mm	No. 1	2.25 mm	1.34mm	100	000000000	00000
M3.5	10mm	7.3mm	2.5mm	No. 2	2.6 mm	1.57mm	100	000000000	00000
M3.5	12mm	7.3mm	2.5mm	No. 2	2.6 mm	1.57mm	100	000000000	00000
M3.5	14mm	7.3mm	2.5mm	No. 2	2.6 mm	1.57mm	100	000000000	00000
M3.5	16mm	7.3mm	2.5mm	No. 2	2.6 mm	1.57mm	100	000000000	00000
M4	8mm	8.4mm	2.9mm	No. 2	3 mm	1.79mm	100	000000000	00000
M4	10mm	8.4mm	2.9mm	No. 2	3 mm	1.79mm	50	000000000	0000
M4	12mm	8.4mm	2.9mm	No. 2	3 mm	1.79mm	100	000000000	00000
M4	16mm	8.4mm	2.9mm	No. 2	3 mm	1.79mm	50	000000000	0000
M4	20mm	8.4mm	2.9mm	No. 2	3 mm	1.79mm	50	000000000	0000
M5	8mm	9.3mm	3.4mm	No. 2	3.75 mm	2.27mm	100	000000000	00000
M5	10mm	9.3mm	3.4mm	No. 2	3.75 mm	2.24mm	50	000000000	0000
M5	14mm	9.3mm	3.4mm	No. 2	3.75 mm	2.24mm	50	000000000	0000