PT Delta-Style Screws | McMaster-Carr

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155 Products

About Tapping Screws

Compare drilling, pointed, thread-forming, and thread-cutting tips to find the best choice for your material.

Fastener Head Type

Flanged

Distribute pressure evenly to prevent damaging material

49 products

Performance

Corrosion Resistant

Won't rust in wet and outdoor environments

83 products

Drive Style

Torx

A six-lobe opening prevents drivers from slipping

49 products

Torx Plus

A step up from Torx for your highest-torque jobs

106 products

Steel Torx Plus Rounded Head Thread-Forming Screws for Thin-Walled Holes in Plastic

Thread these screws into thin-walled holes without damaging the drive or your workpiece. The deep, six-lobe recess withstands more torque than a Torx drive to prevent slipping. These screws have narrow-angle threads that prevent cracking and discoloration in molded plastics, such as ABS, PVC, and polycarbonate. The rounded head creates a finished look.

Length is measured from under the head.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

			Head, mm
	Style	Lg., mm	Dia.	Ht.	Tapping Screw Type	Drive Size	Drill Bit Size	Shank Cross Section	Pkg. Qty.		Pkg.
Zinc-Plated Steel







				M1 Screw Size

				A	2	1.875	0.8	TRS	IP2, T2	67 Ga.	Round	25	96817A007	000000


				A	3	1.875	0.8	TRS	IP2, T2	67 Ga.	Round	25	96817A009	00000
				A	4	1.875	0.8	TRS	IP2, T2	67 Ga.	Round	25	96817A011	00000




						M1.2 Screw Size

						A	2	2.175	0.95	TRS	IP3, T3	62 Ga.	Round	25	96817A031	00000


						A	3	2.175	0.95	TRS	IP3, T3	62 Ga.	Round	25	96817A034	00000
						A	4	2.175	0.95	TRS	IP3, T3	62 Ga.	Round	25	96817A036	00000
						A	5	2.175	0.95	TRS	IP3, T3	62 Ga.	Round	25	96817A039	00000




								M1.4 Screw Size

								A	3	2.35	1.15	TRS	IP3, T3	56 Ga.	Round	25	96817A082	0000


								A	4	2.35	1.15	TRS	IP3, T3	56 Ga.	Round	25	96817A085	0000
								A	5	2.35	1.15	TRS	IP3, T3	56 Ga.	Round	25	96817A088	0000
								A	6	2.35	1.15	TRS	IP3, T3	56 Ga.	Round	25	96817A090	0000




										M1.6 Screw Size

										A	3	2.75	1.2	TRS	IP5, T5	55 Ga.	Round	25	96817A110	0000


										A	4	2.75	1.2	TRS	IP5, T5	55 Ga.	Round	25	96817A113	0000
										A	5	2.75	1.2	TRS	IP5, T5	55 Ga.	Round	25	96817A115	0000
										A	6	2.75	1.2	TRS	IP5, T5	55 Ga.	Round	25	96817A118	0000




												M1.8 Screw Size

												A	4	3.05	1.35	TRS	IP6, T6	54 Ga.	Round	25	96817A152	0000


												A	5	3.05	1.35	TRS	IP6, T6	54 Ga.	Round	25	96817A154	0000
												A	6	3.05	1.35	TRS	IP6, T6	54 Ga.	Round	25	96817A156	0000




	M2 Screw Size

	A												3	3.35	1.6	TRS	IP6, T6	52 Ga.	Round	25	96817A201	0000


	A	4											3.35	1.6	TRS	IP6, T6	52 Ga.	Round	25	96817A204	0000
	A	5	3.35										1.6	TRS	IP6, T6	52 Ga.	Round	25	96817A207	0000
	A	6	3.35										1.6	TRS	IP6, T6	52 Ga.	Round	25	96817A209	0000
	A	8	3.35										1.6	TRS	IP6, T6	52 Ga.	Round	25	96817A212	0000




			M2.2 Screw Size

			A										4	3.75	1.6	TRS	IP6, T6	50 Ga.	Round	25	96817A218	0000


			A	5	3.75								1.6	TRS	IP6, T6	50 Ga.	Round	25	96817A219	0000
			A	6	3.75								1.6	TRS	IP6, T6	50 Ga.	Round	25	96817A220	0000
			A	8	3.75								1.6	TRS	IP6, T6	50 Ga.	Round	25	96817A240	0000
			A	10	3.75								1.6	TRS	IP6, T6	50 Ga.	Round	25	96817A260	0000




					M2.5 Screw Size

					A								5	4.25	1.9	TRS	IP8, T8	45 Ga.	Round	25	96817A263	0000


					A	6	4.25						1.9	TRS	IP8, T8	45 Ga.	Round	25	96817A265	0000
					A	8	4.25						1.9	TRS	IP8, T8	45 Ga.	Round	25	96817A268	0000
					A	10	4.25						1.9	TRS	IP8, T8	45 Ga.	Round	25	96817A271	0000
					A	12	4.25						1.9	TRS	IP8, T8	45 Ga.	Round	25	96817A274	0000




							M3 Screw Size

							A						5	5.15	2.3	TRS	IP10, T10	41 Ga.	Round	25	96817A300	0000


							A	6	5.15				2.3	TRS	IP10, T10	41 Ga.	Round	25	96817A310	0000
							A	8	5.15				2.3	TRS	IP10, T10	41 Ga.	Round	25	96817A330	0000
							A	10	5.15				2.3	TRS	IP10, T10	41 Ga.	Round	25	96817A350	0000
							A	12	5.15				2.3	TRS	IP10, T10	41 Ga.	Round	25	96817A370	0000




									M3.5 Screw Size

									A				6	5.92	2.7	TRS	IP15, T15	34 Ga.	Round	25	96817A420	0000


									A	10	5.92		2.7	TRS	IP15, T15	34 Ga.	Round	25	96817A440	0000
									A	12	5.92		2.7	TRS	IP15, T15	34 Ga.	Round	25	96817A460	0000




M4 Screw Size

A											8		6.82	3.1	TRS	IP20, T20	30 Ga.	Round	25	96817A500	0000


A											10	6.82	3.1	TRS	IP20, T20	30 Ga.	Round	25	96817A510	0000
A											12	6.82	3.1	TRS	IP20, T20	30 Ga.	Round	25	96817A520	0000
A											14	6.82	3.1	TRS	IP20, T20	30 Ga.	Round	25	96817A522	00000




												M4.5 Screw Size

	A	8										7.5	3.35	TRS	IP20, T20	27 Ga.	Round	25	96817A541	0000


	A	10										7.5	3.35	TRS	IP20, T20	27 Ga.	Round	25	96817A544	0000
	A	12										7.5	3.35	TRS	IP20, T20	27 Ga.	Round	25	96817A547	00000
	A	14										7.5	3.35	TRS	IP20, T20	27 Ga.	Round	25	96817A552	00000




												M5 Screw Size

			A									10	8.62	3.5	TRS	IP25, T25	21 Ga.	Round	25	96817A620	00000


			A	12								8.62	3.5	TRS	IP25, T25	21 Ga.	Round	25	96817A640	00000




												M6 Screw Size

												A	12	10.5	4.35	TRS	IP30, T30	12 Ga.	Round	25	96817A663	00000


					A							14	10.5	4.35	TRS	IP30, T30	12 Ga.	Round	25	96817A668	00000

Steel Torx Flanged Rounded Head Thread-Forming Screws for Thin-Walled Holes in Plastic

With a flange under the head, these screws distribute pressure to prevent denting or pulling through holes in thin plastic. Their threads have a narrow angle to drive into drive into ABS, PVC, and polycarbonate without cracking or discoloring the material. The Torx drive ensures a good grip with less slip than slotted, Phillips, square, or hex drives. These screws have a rounded head to create a finished look.

Length is measured from under the head.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

	Style	Lg., mm	Head Ht., mm	Flange Dia., mm	Tapping Screw Type	Drive Size	Drill Bit Size	Shank Cross Section	Pkg. Qty.		Pkg.
Zinc-Plated Steel







				M2 Screw Size

				B	4	1.3	4	TRS	T6	58 Ga.	Round	25	96817A311	00000


				B	6	1.3	4	TRS	T6	58 Ga.	Round	25	96817A312	0000
				B	8	1.3	4	TRS	T6	58 Ga.	Round	25	96817A313	0000




						M2.2 Screw Size

						B	4	1.4	4.5	TRS	T6	56 Ga.	Round	25	96817A314	0000


						B	6	1.4	4.5	TRS	T6	56 Ga.	Round	25	96817A315	0000




								M2.5 Screw Size

								B	6	1.5	5	TRS	T6	54 Ga.	Round	50	96817A317	00000


								B	8	1.5	5	TRS	T6	54 Ga.	Round	50	96817A318	00000
								B	10	1.5	5	TRS	T6	54 Ga.	Round	50	96817A319	00000




										M3 Screw Size

										B	8	2.1	6	TRS	T10	52 Ga.	Round	100	96817A321	00000


										B	10	2.1	6	TRS	T10	52 Ga.	Round	100	96817A322	00000
										B	12	2.1	6	TRS	T10	52 Ga.	Round	100	96817A323	00000




												M3.5 Screw Size

												B	8	2.4	7	TRS	T10	50 Ga.	Round	100	96817A324	00000


												B	10	2.4	7	TRS	T10	50 Ga.	Round	100	96817A325	00000
												B	12	2.4	7	TRS	T10	50 Ga.	Round	50	96817A326	0000




														M4 Screw Size

														B	10	2.6	8	TRS	T20	45 Ga.	Round	50	96817A327	0000


B	12													2.6	8	TRS	T20	45 Ga.	Round	50	96817A328	0000
B	16													2.6	8	TRS	T20	45 Ga.	Round	50	96817A329	0000




		M5 Screw Size

		B	10											3.3	10	TRS	T20	38 Ga.	Round	50	96817A331	00000


		B	12											3.3	10	TRS	T20	38 Ga.	Round	50	96817A332	00000

Stainless Steel Torx Plus Rounded Head Thread-Forming Screws for Thin-Walled Holes in Plastic

These corrosion-resistant screws thread into thin plastic without damaging the drive or your workpiece. The deep, six-lobe recess withstands more torque than a Torx drive to prevent slipping. These screws have narrow-angle threads that prevent cracking and discoloration in molded plastics, such as ABS, PVC, and polycarbonate. The rounded head creates a finished look.

Length is measured from under the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Head, mm
	Lg., mm	Dia.	Ht.	Tapping Screw Type	Drive Size	Drill Bit Size	Shank Cross Section	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				M1 Screw Size

				3	1.875	0.8	TRS	IP2, T2	67 Ga.	Round	25	96817A704	000000


				4	1.875	0.8	TRS	IP2, T2	67 Ga.	Round	25	96817A707	00000




						M1.2 Screw Size

						2	2.175	0.95	TRS	IP3, T3	62 Ga.	Round	25	96817A742	00000


						3	2.175	0.95	TRS	IP3, T3	62 Ga.	Round	25	96817A744	00000
						4	2.175	0.95	TRS	IP3, T3	62 Ga.	Round	25	96817A746	00000
						5	2.175	0.95	TRS	IP3, T3	62 Ga.	Round	25	96817A748	00000




								M1.4 Screw Size

								3	2.35	1.15	TRS	IP3, T3	56 Ga.	Round	25	96817A780	00000


								4	2.35	1.15	TRS	IP3, T3	56 Ga.	Round	25	96817A783	00000
								5	2.35	1.15	TRS	IP3, T3	56 Ga.	Round	25	96817A785	00000
								6	2.35	1.15	TRS	IP3, T3	56 Ga.	Round	25	96817A787	00000




										M1.6 Screw Size

										3	2.75	1.2	TRS	IP5, T5	55 Ga.	Round	25	96817A795	0000


										4	2.75	1.2	TRS	IP5, T5	55 Ga.	Round	25	96817A797	00000
										5	2.75	1.2	TRS	IP5, T5	55 Ga.	Round	25	96817A799	00000
										6	2.75	1.2	TRS	IP5, T5	55 Ga.	Round	25	96817A800	00000




												M1.8 Screw Size

												3	3.05	1.35	TRS	IP6, T6	54 Ga.	Round	25	96817A812	00000


												4	3.05	1.35	TRS	IP6, T6	54 Ga.	Round	25	96817A814	00000
												5	3.05	1.35	TRS	IP6, T6	54 Ga.	Round	25	96817A816	00000
												6	3.05	1.35	TRS	IP6, T6	54 Ga.	Round	25	96817A818	00000




	M2 Screw Size

	3												3.35	1.6	TRS	IP6, T6	52 Ga.	Round	25	96817A838	00000


	4	3.35											1.6	TRS	IP6, T6	52 Ga.	Round	25	96817A840	00000
	5	3.35	1.6										TRS	IP6, T6	52 Ga.	Round	25	96817A842	00000
	6	3.35	1.6										TRS	IP6, T6	52 Ga.	Round	25	96817A844	00000
	8	3.35	1.6										TRS	IP6, T6	52 Ga.	Round	25	96817A846	00000




			M2.2 Screw Size

			4										3.75	1.6	TRS	IP6, T6	50 Ga.	Round	25	96817A861	0000


			5	3.75	1.6								TRS	IP6, T6	50 Ga.	Round	25	96817A863	0000
			6	3.75	1.6								TRS	IP6, T6	50 Ga.	Round	25	96817A865	0000
			8	3.75	1.6								TRS	IP6, T6	50 Ga.	Round	25	96817A867	0000
			10	3.75	1.6								TRS	IP6, T6	50 Ga.	Round	25	96817A869	00000




					M2.5 Screw Size

					5								4.25	1.9	TRS	IP8, T8	45 Ga.	Round	25	96817A890	0000


					6	4.25	1.9						TRS	IP8, T8	45 Ga.	Round	25	96817A892	0000
					8	4.25	1.9						TRS	IP8, T8	45 Ga.	Round	25	96817A894	0000
					10	4.25	1.9						TRS	IP8, T8	45 Ga.	Round	25	96817A896	00000
					12	4.25	1.9						TRS	IP8, T8	45 Ga.	Round	25	96817A899	00000




							M3 Screw Size

							5						5.15	2.3	TRS	IP10, T10	41 Ga.	Round	25	96817A904	0000


							6	5.15	2.3				TRS	IP10, T10	41 Ga.	Round	25	96817A906	0000
							8	5.15	2.3				TRS	IP10, T10	41 Ga.	Round	25	96817A908	00000
							10	5.15	2.3				TRS	IP10, T10	41 Ga.	Round	25	96817A910	00000
							12	5.15	2.3				TRS	IP10, T10	41 Ga.	Round	25	96817A912	00000




									M3.5 Screw Size

									6				5.92	2.7	TRS	IP15, T15	34 Ga.	Round	25	96817A932	00000


									10	5.92	2.7		TRS	IP15, T15	34 Ga.	Round	25	96817A935	00000
									12	5.92	2.7		TRS	IP15, T15	34 Ga.	Round	25	96817A938	00000




M4 Screw Size

8											6.82		3.1	TRS	IP20, T20	30 Ga.	Round	25	96817A950	00000


10											6.82	3.1	TRS	IP20, T20	30 Ga.	Round	25	96817A953	00000
12											6.82	3.1	TRS	IP20, T20	30 Ga.	Round	25	96817A956	00000
14											6.82	3.1	TRS	IP20, T20	30 Ga.	Round	25	96817A959	00000




												M4.5 Screw Size

	8	7.5										3.35	TRS	IP20, T20	27 Ga.	Round	25	96817A971	00000


	10	7.5										3.35	TRS	IP20, T20	27 Ga.	Round	25	96817A973	00000
	12	7.5										3.35	TRS	IP20, T20	27 Ga.	Round	25	96817A975	00000
	14	7.5										3.35	TRS	IP20, T20	27 Ga.	Round	25	96817A977	00000




												M5 Screw Size

			10									8.62	3.5	TRS	IP25, T25	21 Ga.	Round	25	96817A984	00000


			12	8.62								3.5	TRS	IP25, T25	21 Ga.	Round	25	96817A987	00000




												M6 Screw Size

												12	10.5	4.35	TRS	IP30, T30	12 Ga.	Round	25	96817A992	00000


					14							10.5	4.35	TRS	IP30, T30	12 Ga.	Round	25	96817A996	00000

Stainless Steel Torx Flanged Rounded Head Thread-Forming Screws for Thin-Walled Holes in Plastic

These corrosion-resistant screws have a flange under the head to distribute pressure and prevent denting or pulling through thin plastic. Their narrow-angle threads drive into ABS, PVC, and polycarbonate without cracking or discoloring the material. The Torx drive ensures a good grip with less slip than slotted, Phillips, square, or hex drives. These screws have a rounded head to create a finished look.

Length is measured from under the flange.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Head Ht., mm	Flange Dia., mm	Tapping Screw Type	Drive Size	Drill Bit Size	Shank Cross Section	Pkg. Qty.		Pkg.
18-8 Stainless Steel







			M1.6 Screw Size

			5	1.3	3.6	TRS	T5	56 Ga.	Round	25	96817A401	00000


			6	1.3	3.6	TRS	T5	56 Ga.	Round	25	96817A402	0000
			8	1.3	3.6	TRS	T5	56 Ga.	Round	25	96817A403	0000




					M2 Screw Size

					4	1.3	4	TRS	T6	58 Ga.	Round	25	96817A404	0000


					5	1.3	4	TRS	T6	58 Ga.	Round	25	96817A405	0000
					6	1.3	4	TRS	T6	58 Ga.	Round	25	96817A406	00000
					8	1.3	4	TRS	T6	58 Ga.	Round	25	96817A407	00000




							M2.2 Screw Size

							4	1.4	4.5	TRS	T6	56 Ga.	Round	25	96817A408	0000


							5	1.4	4.5	TRS	T6	56 Ga.	Round	50	96817A409	00000
							6	1.4	4.5	TRS	T6	56 Ga.	Round	25	96817A411	0000
							8	1.4	4.5	TRS	T6	56 Ga.	Round	25	96817A412	0000




									M2.5 Screw Size

									5	1.5	5	TRS	T8	54 Ga.	Round	50	96817A413	00000


									6	1.5	5	TRS	T8	54 Ga.	Round	25	96817A414	00000
									8	1.5	5	TRS	T8	54 Ga.	Round	25	96817A415	0000
									10	1.5	5	TRS	T8	54 Ga.	Round	50	96817A416	00000
									12	1.5	5	TRS	T8	54 Ga.	Round	50	96817A417	00000




											M3 Screw Size

											5	2.1	6	TRS	T10	52 Ga.	Round	50	96817A418	0000


											6	2.1	6	TRS	T10	52 Ga.	Round	50	96817A419	00000
											8	2.1	6	TRS	T10	52 Ga.	Round	50	96817A421	00000
											10	2.1	6	TRS	T10	52 Ga.	Round	50	96817A422	00000
											12	2.1	6	TRS	T10	52 Ga.	Round	50	96817A423	00000




											M3.5 Screw Size

	10	2.4									7	TRS	T10	50 Ga.	Round	25	96817A424	0000


	12	2.4									7	TRS	T10	50 Ga.	Round	25	96817A425	0000
	14	2.4									7	TRS	T10	50 Ga.	Round	25	96817A426	0000




											M4 Screw Size

			8	2.6							8	TRS	T20	45 Ga.	Round	25	96817A427	0000


			10	2.6							8	TRS	T20	45 Ga.	Round	25	96817A428	0000
			12	2.6							8	TRS	T20	45 Ga.	Round	25	96817A429	0000
			14	2.6							8	TRS	T20	45 Ga.	Round	25	96817A431	0000




											M5 Screw Size

					10	3.3					10	TRS	T20	38 Ga.	Round	25	96817A432	00000


					12	3.3					10	TRS	T20	38 Ga.	Round	25	96817A433	00000