PT Delta-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