PT Delta-Style Screws | McMaster-Carr

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.

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
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	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	0000
12	8.62	3.5	IP25, T25	Torx Plus	No. 21	1.8	25	000000000	0000
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

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

	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	00000
12	5.15	2.3	IP10, T10	No. 41	1.12	25	000000000	00000
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	00000
12	6.82	3.1	IP20, T20	No. 30	1.46	25	000000000	00000
14	6.82	3.1	IP20, T20	No. 30	1.46	25	000000000	00000
M4.5
8	7.5	3.35	IP20, T20	No. 27	1.63	25	000000000	00000
10	7.5	3.35	IP20, T20	No. 27	1.63	25	000000000	00000
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

Round Head Screws with Flange

Round Head with Flange

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