Left-Hand Threaded Socket Head Cap Screws

Filter by

Thread Direction

Left Hand

System of Measurement

Thread Size

Length

Fastener Head Type

Threading

Socket Head Profile

Thread Pitch

Material

Drive Size

Finish

Drive Style

Specifications Met

Head Diameter

Head Height

Thread Type

Thread Spacing

Fastener Strength Grade/Class

Class 12.9

Tensile Strength

Less than 100,000 psi

150,000 psi or greater

Hardness

Thread Fit

Unified Standard Class 2A

Unified Standard Class 3A

REACH

Compliant

DFARS Specialty Metals

Compliant

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

RoHS

Compliant

Export Control Classification Number (ECCN)

EAR99

Forward

How can we improve?

124 Products

Left-Hand-Thread Steel Socket Head Screws

Fully Threaded

Partially Threaded

No more righty tighty. Turn these screws to the left to tighten. They won't come loose from counterclockwise motions on reverse motors, grinders, and fans. Made of alloy steel, these are some of our strongest screws. Their deep, six-point socket keeps hex keys from slipping out and damaging the drive.

Length is measured from under the head.

Black-Oxide Alloy Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Fastener Strength Grade/Class		Each
Black-Oxide Alloy Steel







				6-32

				3/8"	0.226"	0.138"	Fully Threaded	Coarse	170,000	—	91670A146	000000


				1/2"	0.226"	0.138"	Fully Threaded	Coarse	170,000	—	91670A148	00000




						8-32

						1/2"	0.27"	0.164"	Fully Threaded	Coarse	170,000	—	91670A194	0000


						1"	0.27"	0.164"	Fully Threaded	Coarse	170,000	—	91670A199	00000




								10-32

								1/2"	5/16"	0.19"	Fully Threaded	Fine	170,000	—	91670A310	0000


								3/4"	5/16"	0.19"	Fully Threaded	Fine	170,000	—	91670A313	0000
								1"	5/16"	0.19"	Fully Threaded	Fine	170,000	—	91670A316	00000
								1 1/2"	5/16"	0.19"	Fully Threaded	Fine	170,000	—	91670A319	00000




										1/4"-20

										1/2"	3/8"	1/4"	Fully Threaded	Coarse	170,000	—	91670A537	0000


										5/8"	3/8"	1/4"	Fully Threaded	Coarse	170,000	—	91670A539	0000
										3/4"	3/8"	1/4"	Fully Threaded	Coarse	170,000	—	91670A540	00000
										1"	3/8"	1/4"	Fully Threaded	Coarse	170,000	—	91670A542	00000
										1 1/4"	3/8"	1/4"	Fully Threaded	Coarse	170,000	—	91670A544	00000
										1 1/2"	3/8"	1/4"	Fully Threaded	Coarse	170,000	—	91670A546	00000




												5/16"-18

												3/4"	15/32"	5/16"	Fully Threaded	Coarse	170,000	—	91670A581	00000


												1"	15/32"	5/16"	Fully Threaded	Coarse	170,000	—	91670A583	00000
												1 1/4"	15/32"	5/16"	Fully Threaded	Coarse	170,000	—	91670A585	00000
												1 1/2"	15/32"	5/16"	Fully Threaded	Coarse	170,000	—	91670A587	00000
												2"	15/32"	5/16"	Fully Threaded	Coarse	170,000	—	91670A589	00000




												3/8"-16

												3/4"	9/16"	3/8"	Fully Threaded	Coarse	170,000	—	91670A622	00000


		1"	9/16"									3/8"	Fully Threaded	Coarse	170,000	—	91670A624	00000
		1 1/4"	9/16"									3/8"	Fully Threaded	Coarse	170,000	—	91670A626	00000




												1/2"-13

				1"								3/4"	1/2"	Fully Threaded	Coarse	170,000	—	91670A713	00000


				1 1/2"	3/4"							1/2"	Fully Threaded	Coarse	170,000	—	91670A716	00000
				2"	3/4"							1/2"	Fully Threaded	Coarse	170,000	—	91670A720	00000




												M4 × 0.7 mm

						6 mm	7 mm					4 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A002	00000


						8 mm	7 mm					4 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A003	00000
						10 mm	7 mm					4 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A004	00000
						12 mm	7 mm					4 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A005	00000
						16 mm	7 mm					4 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A007	00000
						20 mm	7 mm					4 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A009	00000




								M5 × 0.8 mm

								12 mm	8.5 mm			5 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A125	00000


								16 mm	8.5 mm			5 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A127	00000
								20 mm	8.5 mm			5 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A129	00000
								25 mm	8.5 mm			5 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A131	0000




												M6 × 1 mm

										12 mm		10 mm	6 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A163	00000


										16 mm	10 mm	6 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A164	00000
										20 mm	10 mm	6 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A165	00000
										25 mm	10 mm	6 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A167	00000
										30 mm	10 mm	6 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A169	0000




												M8 × 1.25 mm

16 mm	13 mm											8 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A251	00000


20 mm	13 mm											8 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A252	00000
25 mm	13 mm											8 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A254	00000
30 mm	13 mm											8 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A256	00000
35 mm	13 mm											8 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A257	00000
40 mm	13 mm											8 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A258	00000




		M10 × 1.5 mm

		20 mm	16 mm									10 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A302	00000


		25 mm	16 mm									10 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A303	00000
		30 mm	16 mm									10 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A305	00000
		35 mm	16 mm									10 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A307	00000
		40 mm	16 mm									10 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A309	00000




				M12 × 1.75 mm

				25 mm	18 mm							12 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A336	00000


				30 mm	18 mm							12 mm	Fully Threaded	Coarse	170,000	Class 12.9	90605A338	00000
				40 mm	18 mm							12 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A341	00000
				50 mm	18 mm							12 mm	Partially Threaded	Coarse	170,000	Class 12.9	90605A342	00000

Left-Hand-Thread Stainless Steel Socket Head Screws

No more righty tighty. Turn these corrosion-resistant screws to the left to tighten. They won't come loose from counterclockwise motions on reverse motors, grinders, and fans. Their deep, six-point socket keeps hex keys from slipping out and damaging the drive.

Length is measured from under the head.

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

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi		Each
18-8 Stainless Steel







				8-32

				3/8"	0.27"	0.164"	Fully Threaded	Coarse	70,000	92202A150	000000


				1/2"	0.27"	0.164"	Fully Threaded	Coarse	70,000	92202A155	00000
				3/4"	0.27"	0.164"	Fully Threaded	Coarse	70,000	92202A160	00000




						10-32

						1/2"	5/16"	0.19"	Fully Threaded	Fine	70,000	92202A255	00000


						3/4"	5/16"	0.19"	Fully Threaded	Fine	70,000	92202A260	00000
						1"	5/16"	0.19"	Fully Threaded	Fine	70,000	92202A265	00000




								1/4"-20

								1/2"	3/8"	1/4"	Fully Threaded	Coarse	70,000	92202A315	00000


								5/8"	3/8"	1/4"	Fully Threaded	Coarse	70,000	92202A317	00000
								3/4"	3/8"	1/4"	Fully Threaded	Coarse	70,000	92202A318	00000
								1"	3/8"	1/4"	Fully Threaded	Coarse	70,000	92202A321	00000
								1 1/4"	3/8"	1/4"	Fully Threaded	Coarse	70,000	92202A324	00000
								1 1/2"	3/8"	1/4"	Fully Threaded	Coarse	70,000	92202A327	00000
								2"	3/8"	1/4"	Fully Threaded	Coarse	70,000	92202A331	00000

Left-Hand-Thread Stainless Steel Hex-Drive Flat Head Screws

No more righty tighty—tighten these screws by turning them to the left. Unlike other screws, they won't come loose during counterclockwise motions on reverse motors, grinders, and fans. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals. With six contact points, the hex drive withstands more torque than slotted and Phillips to securely grip your driver without slipping and stripping the drive.

Length is measured from the top of the head.

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

Standard Profile—Standard-profile heads are the most common choice for flat head screws.

				Head
	Lg.	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				4-40

				1/4"	82°	Standard	0.255"	0.083"	Fully Threaded	70,000	Material Certificate	5	91512A110	00000


				1/2"	82°	Standard	0.255"	0.083"	Fully Threaded	70,000	—	5	91512A120	00000




						6-32

						1/4"	82°	Standard	0.307"	0.097"	Fully Threaded	70,000	—	5	91512A130	0000


						1/2"	82°	Standard	0.307"	0.097"	Fully Threaded	70,000	—	5	91512A140	0000




								8-32

								1/2"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	—	5	91512A150	00000


								3/4"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	—	5	91512A160	00000




										10-32

										1/2"	82°	Standard	0.411"	0.127"	Fully Threaded	70,000	—	1	91512A170	0000


										3/4"	82°	Standard	0.411"	0.127"	Fully Threaded	70,000	—	1	91512A180	0000




												1/4"-20

												1/2"	82°	Standard	0.531"	0.161"	Fully Threaded	70,000	—	1	91512A190	0000


												1"	82°	Standard	0.531"	0.161"	Fully Threaded	70,000	Material Certificate	1	91512A210	0000




														M3 × 0.5 mm

														6 mm	90°	Standard	6.00 mm	1.70 mm	Fully Threaded	70,000	Material Certificate	5	91518A110	0000


														10 mm	90°	Standard	6.00 mm	1.70 mm	Fully Threaded	70,000	—	5	91518A120	00000




														M4 × 0.7 mm

		8 mm												90°	Standard	8.00 mm	2.30 mm	Fully Threaded	70,000	—	5	91518A130	00000


		12 mm	90°											Standard	8.00 mm	2.30 mm	Fully Threaded	70,000	—	5	91518A140	00000




														M5 × 0.8 mm

				10 mm										90°	Standard	10.00 mm	2.80 mm	Fully Threaded	70,000	—	1	91518A150	0000


				16 mm	90°									Standard	10.00 mm	2.80 mm	Fully Threaded	70,000	—	1	91518A160	0000




														M6 × 1 mm

						12 mm								90°	Standard	12.00 mm	3.30 mm	Fully Threaded	70,000	Material Certificate	1	91518A170	0000


						20 mm	90°							Standard	12.00 mm	3.30 mm	Fully Threaded	70,000	—	1	91518A180	0000




														M8 × 1.25 mm

								16 mm						90°	Standard	16.00 mm	4.40 mm	Fully Threaded	70,000	—	1	91518A190	0000


								25 mm	90°					Standard	16.00 mm	4.40 mm	Fully Threaded	70,000	Material Certificate	1	91518A210	0000

Left-Hand-Thread Stainless Steel Button Head Hex-Drive Screws

Image of Product. Front orientation. Contains MultipleImages. Rounded Head Screws. Left-Hand-Thread Stainless Steel Button Head Hex-Drive Screws.

No more righty tighty. Turn these screws to the left to tighten them. Unlike other screws, they won't come loose during counterclockwise motions on reverse motors, grinders, and fans. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals. The button head looks similar to a pan head, but it's lower and more compact, taking up less space. With six contact points, the hex drive withstands more torque than slotted and Phillips to securely grip your driver.

Length is measured from under the head.

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

		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Certificate Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				4-40

				1/4"	0.213"	0.059"	Fully Threaded	80,000	—	5	95955A223	00000


				3/8"	0.213"	0.059"	Fully Threaded	80,000	—	5	95955A226	0000
				1/2"	0.213"	0.059"	Fully Threaded	80,000	Material Certificate	5	95955A229	0000
				3/4"	0.213"	0.059"	Fully Threaded	80,000	Material Certificate	5	95955A232	00000




						6-32

						3/8"	0.262"	0.073"	Fully Threaded	80,000	—	5	95955A245	0000


						1/2"	0.262"	0.073"	Fully Threaded	80,000	—	5	95955A248	0000
						3/4"	0.262"	0.073"	Fully Threaded	80,000	—	5	95955A251	0000
						1"	0.262"	0.073"	Fully Threaded	80,000	—	5	95955A254	00000




								8-32

								3/8"	0.312"	0.087"	Fully Threaded	80,000	—	5	95955A267	0000


								1/2"	0.312"	0.087"	Fully Threaded	80,000	—	5	95955A270	0000
								3/4"	0.312"	0.087"	Fully Threaded	80,000	—	5	95955A273	00000
								1"	0.312"	0.087"	Fully Threaded	80,000	—	5	95955A276	00000




										10-32

										3/8"	0.361"	0.101"	Fully Threaded	80,000	Material Certificate	5	95955A289	0000


										1/2"	0.361"	0.101"	Fully Threaded	80,000	—	5	95955A292	00000
										3/4"	0.361"	0.101"	Fully Threaded	80,000	—	5	95955A295	00000
										1"	0.361"	0.101"	Fully Threaded	80,000	—	5	95955A298	00000




												1/4"-20

												3/8"	0.437"	0.132"	Fully Threaded	80,000	Material Certificate	5	95955A301	00000


												1/2"	0.437"	0.132"	Fully Threaded	80,000	—	5	95955A304	00000
												3/4"	0.437"	0.132"	Fully Threaded	80,000	—	5	95955A307	00000
												1"	0.437"	0.132"	Fully Threaded	80,000	—	5	95955A310	00000




												M3 × 0.5 mm

		6 mm										5.7 mm	1.65 mm	Fully Threaded	80,000	—	5	95942A111	0000


		8 mm	5.7 mm									1.65 mm	Fully Threaded	80,000	—	5	95942A112	0000
		10 mm	5.7 mm									1.65 mm	Fully Threaded	80,000	—	5	95942A113	0000
		12 mm	5.7 mm									1.65 mm	Fully Threaded	80,000	Material Certificate	5	95942A114	00000




												M4 × 0.7 mm

				8 mm								7.6 mm	2.2 mm	Fully Threaded	80,000	—	5	95942A115	0000


				10 mm	7.6 mm							2.2 mm	Fully Threaded	80,000	Material Certificate	5	95942A116	00000
				12 mm	7.6 mm							2.2 mm	Fully Threaded	80,000	—	5	95942A117	00000
				16 mm	7.6 mm							2.2 mm	Fully Threaded	80,000	—	5	95942A118	00000




												M5 × 0.8 mm

						10 mm						9.5 mm	2.75 mm	Fully Threaded	80,000	—	5	95942A119	0000


						12 mm	9.5 mm					2.75 mm	Fully Threaded	80,000	—	5	95942A121	00000
						16 mm	9.5 mm					2.75 mm	Fully Threaded	80,000	—	5	95942A122	00000
						20 mm	9.5 mm					2.75 mm	Fully Threaded	80,000	—	5	95942A123	00000




												M6 × 1 mm

								10 mm				10.5 mm	3.3 mm	Fully Threaded	80,000	Material Certificate	5	95942A124	00000


								12 mm	10.5 mm			3.3 mm	Fully Threaded	80,000	—	5	95942A125	00000
								16 mm	10.5 mm			3.3 mm	Fully Threaded	80,000	—	5	95942A126	00000
								20 mm	10.5 mm			3.3 mm	Fully Threaded	80,000	—	5	95942A127	00000