Flare-Nut Wrenches | McMaster-Carr

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94 Products

Sure-Grip Open-End Wrenches


Hex Sure-Grip Opening	12-Point Sure-Grip Opening

Round Opening

Get a firm hold on flare nuts and fittings to create leak-tight seals on tubing without cracking it. The heads on these wrenches have recessed corners to distribute turning force more evenly than standard wrenches, preventing stripping and slipping. They're well-suited for tight spots on refrigeration, brake, fuel, or hydraulic lines. Also known as flare-nut or line wrenches.

Hex Sure-Grip Opening—Avoid rounding off the corners of hex-head fasteners. These wrenches won't slip, even when nuts and bolts are rusted or damaged, since they grip the sides rather than the corners.

Hex Sure-Grip and Round Openings—One end snugly grips sides rather than corners of hex-head fasteners so they won’t slip, even when nuts and bolts are rusted or damaged. The other end spreads force evenly with round edges to prevent stripping your fasteners.

12-Point Sure-Grip Opening—These wrenches slide onto hex-head fasteners at more angles than those with hex sure-grip openings for quicker engagement. However, they’re more prone to slipping because they make less direct contact with the surfaces.

Chrome-Plated Steel—The most popular finish, these wrenches won't rust or chip. Although they withstand moisture better than black oxide, they don't hold up to harsh chemicals as well as stainless steel.

Dull—With a textured finish, these wrenches won't slip out of your hands, even when greasy or oily.

Polished—The smooth surface is easy to wipe clean of grime. The mirror-like finish lends a high-end look to any toolkit.

	Drive Size	Overall Lg.	Head Style	Opening Angle	Head Offset Angle	Head Thickness	Appearance	Specs. Met		Each
Hex Sure-Grip Opening







				Chrome-Plated Steel

				1/4" × 5/16"	4 7/8"	Offset	15°	15°	1/4" × 9/32"	Dull	ASME B107.100	8537A49	000000


				3/8" × 7/16"	5 13/16"	Offset	15°	15°	5/16" × 11/32"	Dull	ASME B107.100	8537A41	00000
				1/2" × 9/16"	6 13/16"	Offset	15°	15°	3/8" × 13/32"	Dull	ASME B107.100	8537A42	00000
				5/8" × 11/16"	7 3/4"	Offset	15°	15°	7/16" × 15/32"	Dull	ASME B107.100	8537A43	00000
				3/4" × 1"	9 1/2"	Offset	15°	15°	1/2" × 5/8"	Dull	ASME B107.100	8537A47	00000
				7/8" × 1 1/8"	10 1/2"	Offset	15°	15°	9/16" × 11/16"	Dull	ASME B107.100	8537A48	00000
				7 mm × 8 mm	5 3/4"	Offset	Straight	15°	11/32" × 21/64"	Dull	ASME B107.100	7192A17	00000
				9 mm × 11 mm	6 3/8"	Offset	Straight	15°	13/32" × 25/64"	Dull	ASME B107.100	7192A11	00000
				10 mm × 12 mm	7"	Offset	Straight	15°	13/32" × 25/64"	Dull	ASME B107.100	7192A12	00000
				13 mm × 14 mm	7 5/8"	Offset	Straight	15°	15/32" × 29/64"	Dull	ASME B107.100	7192A13	00000
				15 mm × 17 mm	8"	Offset	Straight	15°	1/2" × 31/64"	Dull	ASME B107.100	7192A14	00000


				16 mm × 18 mm	8 7/8"	Offset	Straight	15°	17/32" × 33/64"	Dull	ASME B107.100	7192A15	00000
				19 mm × 21 mm	9 1/2"	Offset	Straight	15°	19/32" × 37/64"	Dull	ASME B107.100	7192A16	00000


				Hex Sure-Grip and Round Openings







								Chrome-Plated Steel

								3/8"	5 3/4"	Offset × Standard	30° × 15°	15°	11/32" × 3/8"	Dull	ASME B107.100	5442A11	00000


								7/16"	6"	Offset × Standard	30° × 15°	15°	3/8" × 13/32"	Dull	ASME B107.100	5442A12	00000
								1/2"	6 1/2"	Offset × Standard	30° × 15°	15°	3/8" × 13/32"	Dull	ASME B107.100	5442A13	00000
								9/16"	7"	Offset × Standard	30° × 15°	15°	7/16" × 15/32"	Dull	ASME B107.100	5442A14	00000
								5/8"	7 5/8"	Offset × Standard	30° × 15°	15°	7/16" × 15/32"	Dull	ASME B107.100	5442A15	00000
								11/16"	8 3/4"	Offset × Standard	30° × 15°	15°	1/2" × 17/32"	Dull	ASME B107.100	5442A16	00000
								3/4"	9 1/4"	Offset × Standard	30° × 15°	15°	1/2" × 17/32"	Dull	ASME B107.100	5442A17	00000


								12-Point Sure-Grip Opening







												Chrome-Plated Steel

												3/8" × 7/16"	6 1/4"	Offset	Straight	15°	11/32" × 3/8"	Dull	ASME B107.100	54745A63	00000


												1/2" × 9/16"	7 1/2"	Offset	Straight	15°	3/8" × 7/16"	Dull	ASME B107.100	54745A64	00000
												5/8" × 11/16"	8 3/4"	Offset	Straight	15°	1/2" × 31/64"	Dull	ASME B107.100	54745A65	00000
1" × 1 1/8"												10 3/4"	Standard	15°	—	53/64"	Polished	ASME B107.100	54745A71	00000
7 mm × 8 mm	5 3/4"											Offset	Straight	15°	11/32" × 21/64"	Dull	ASME B107.100	54855A31	00000
10 mm × 12 mm	7"											Offset	Straight	15°	13/32" × 25/64"	Dull	ASME B107.100	54855A33	00000
13 mm × 14 mm	7 5/8"											Offset	Straight	15°	15/32" × 29/64"	Dull	ASME B107.100	54855A34	00000
15 mm × 17 mm	8"											Offset	Straight	15°	1/2" × 31/64"	Dull	ASME B107.100	54855A35	00000
22 mm × 24 mm	9 1/4"	Offset										15°	15°	43/64" × 5/8"	Dull	DIN 3118	54855A38	00000
24 mm × 27 mm	10 1/8"	Offset	15°									15°	45/64" × 43/64"	Dull	DIN 3118	54855A39	00000
30 mm × 32 mm	11"	Offset	15°									15°	29/32" × 53/64"	Dull	DIN 3118	54855A42	000000

Sure-Grip Open-End Wrench Sets


Hex Sure-Grip Opening	Round Opening

Get a firm hold on various sizes of flare nuts and fittings to create leak-tight seals on tubing without cracking it. The heads on these wrenches have recessed corners to distribute turning force more evenly than standard wrenches, preventing stripping and slipping. They're well-suited for tight spots on refrigeration, brake, fuel, or hydraulic lines. Also known as flare-nut or line wrenches.

Dull—With a textured finish, these wrenches won't slip out of your hands, even when greasy or oily.

	Head Style	Head Offset Angle	Opening Angle	Appearance	Container Type		Each
Hex Sure-Grip Opening







	Chrome-Plated Steel

	5	1/2" × 9/16" 3/4" × 1" 3/8" × 7/16" 5/8" × 11/16" 7/8" × 1 1/8"	5 3/4" to 10 1/2"	Offset	15°	15°	Dull	Fabric Roll-Up Pouch	8537A11	0000000


	5	7 mm × 8 mm 9 mm × 11 mm 10 mm × 12 mm 13 mm × 14 mm 15 mm × 17 mm	5 3/4" to 8"	Offset	15°	Straight	Dull	Fabric Roll-Up Pouch	7192A44	000000


	Hex Sure-Grip and Round Openings







					Chrome-Plated Steel

					7	1/2" 3/4" 3/8" 5/8" 7/16" 9/16" 11/16"	5 3/4" to 9 1/4"	Offset × Standard	15°	30° × 15°	Dull	Fabric Roll-Up Pouch	5442A24	000000

Self-Adjusting Ratcheting Box Wrench Head Sets


Wrench and Socket Extension Not Included

Get a strong grip in tight areas, even on fasteners that are rounded or damaged. Open the spring-loaded jaws in these heads to access a fastener like an open-end wrench; the jaws will automatically close when you push against the fastener. The 6-point opening grips hex heads on all sides. Also known as crowfoot wrenches. Attach one to a socket extension to reach obstructed fasteners. With the ratcheting feature, you can turn the fastener without removing and repositioning the wrench head.

	Includes	Turn Req. to Ratchet	Material	Wrench Opening Shape	Container Type		Each
3/8" Square Drive



	6	Wrench Heads: 8 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm	15°	Stainless Steel	6-Point	Foam Tray	93263A110	0000000

Sure Grip Wrench Heads

Wrench and Socket

Extension Not Included

Hex Sure-Grip Opening

12-Point Sure-Grip

Opening

Grip more of your fastener head with these wrench heads. They have a hex or 12-point opening with more surface area than rounded wrench heads, so they make more contact with fasteners for a better hold. Also known as flare-nut crowfoot wrenches or line wrenches, they're often used with flared tube fittings as well as fuel and hydraulic lines. Connect them to your socket extension and ratchet wrench to turn fasteners where clearance is limited from both the top and side. You can also attach one directly to your ratchet wrench to convert it into an open-ended ratcheting wrench.

Hex Sure-Grip Opening—Hex sure-grip wrench openings achieve the best possible grip on hex fasteners and prevent rounding.

12-Point Sure-Grip Opening—Wrenches with a 12-point sure-grip opening quickly position on hex fasteners.

	Overall Lg.	Thk.	Ctr.-to-Ctr. Lg.	Material	Wrench Opening Shape		Each
3/8" Square Drive



	3/8"	1 13/16"	3/8"	5/8"	Chrome-Plated Steel	Hex Sure Grip	7306A31	000000


	7/16"	1 1/2"	13/32"	5/8"	Chrome-Plated Steel	Hex Sure Grip	7306A32	00000
	1/2"	1 5/8"	7/16"	21/32"	Chrome-Plated Steel	Hex Sure Grip	7306A33	00000
	9/16"	1 5/8"	7/16"	11/16"	Chrome-Plated Steel	Hex Sure Grip	7306A34	00000
	5/8"	1 1/2"	11/16"	3/4"	Chrome-Plated Steel	12-Point Sure Grip	5845A11	00000
	5/8"	1 3/4"	7/16"	3/4"	Chrome-Plated Steel	Hex Sure Grip	7306A35	00000
	11/16"	1 5/8"	11/16"	13/16"	Chrome-Plated Steel	12-Point Sure Grip	5845A12	00000
	11/16"	1 13/16"	15/32"	3/4"	Chrome-Plated Steel	Hex Sure Grip	7306A36	00000
	3/4"	1 11/16"	23/32"	7/8"	Chrome-Plated Steel	12-Point Sure Grip	5845A13	00000
	3/4"	1 15/16"	15/32"	13/16"	Chrome-Plated Steel	Hex Sure Grip	7306A37	00000
	13/16"	1 3/4"	23/32"	7/8"	Chrome-Plated Steel	12-Point Sure Grip	5845A14	00000


	7/8"	1 7/8"	3/4"	15/16"	Chrome-Plated Steel	12-Point Sure Grip	5845A15	00000
	15/16"	1 15/16"	3/4"	15/16"	Chrome-Plated Steel	12-Point Sure Grip	5845A16	00000
	1"	2 1/16"	25/32"	1 1/16"	Chrome-Plated Steel	12-Point Sure Grip	5845A17	00000
	1 1/16"	2 1/8"	25/32"	1 1/16"	Chrome-Plated Steel	12-Point Sure Grip	5845A18	00000


	1/2" Square Drive



			1 1/8"	2 3/8"	29/32"	1 3/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A11	00000


			1 3/16"	2 1/2"	29/32"	1 3/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A23	00000
			1 1/4"	2 1/2"	29/32"	1 1/4"	Chrome-Plated Steel	12-Point Sure Grip	5832A12	00000
			1 5/16"	2 5/8"	29/32"	1 5/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A24	00000
			1 3/8"	2 5/8"	31/32"	1 5/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A14	00000
			1 7/16"	2 3/4"	31/32"	1 3/8"	Chrome-Plated Steel	12-Point Sure Grip	5832A25	00000
			1 1/2"	2 3/4"	31/32"	1 3/8"	Chrome-Plated Steel	12-Point Sure Grip	5832A16	00000
			1 9/16"	2 7/8"	31/32"	1 7/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A26	00000
			1 5/8"	2 7/8"	31/32"	1 1/2"	Chrome-Plated Steel	12-Point Sure Grip	5832A17	00000
			1 11/16"	3"	1 1/32"	1 9/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A27	00000
			1 3/4"	3 1/8"	1 1/32"	1 9/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A19	00000


			1 13/16"	3 1/8"	1 1/32"	1 5/8"	Chrome-Plated Steel	12-Point Sure Grip	5832A28	00000
			1 7/8"	3 1/4"	1 3/32"	1 11/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A21	00000
			1 15/16"	3 3/8"	1 3/32"	1 11/16"	Chrome-Plated Steel	12-Point Sure Grip	5832A29	00000
			2"	3 3/8"	1 3/32"	1 3/4"	Chrome-Plated Steel	12-Point Sure Grip	5832A22	00000

Sure Grip Wrench Head Sets


Wrench and Socket Extension Not Included

Grip more of your fastener head with these wrench heads. They have a hex or 12-point opening with more surface area than rounded wrench heads, so they make more contact with fasteners for a better hold. Also known as flare-nut crowfoot wrenches or line wrenches, they're often used with flared tube fittings as well as fuel and hydraulic lines. Connect them to a socket extension and ratchet wrench to turn fasteners where clearance is limited from both the top and side. You can also attach one directly to your ratchet wrench to convert it into an open-ended ratcheting wrench.

	Includes	Material	Wrench Opening Shape	Container Type		Each
3/8" Square Drive



	8	Wrench Heads: 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1 1/16"	Chrome-Plated Steel	12-Point Sure Grip	Plastic Clip Rail	5845A21	0000000


	18	Wrench Heads: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm	Nickel-Plated Steel	Hex Sure Grip	Plastic Clip Rail	5311A111	000000


	1/2" Square Drive



			8	Wrench Heads: 1 1/8", 1 1/4", 1 5/16", 1 3/8", 1 1/2", 1 5/8", 1 3/4", 2"	Chrome-Plated Steel	12-Point Sure Grip	Plastic Clip Rail	5832A31	000000

Changeable-Head Torque Wrenches

Change heads to use these tools as an open-end, box, square drive, or hex-key wrench. The handle and head combination you choose may have different maximum torque values. Do not exceed the lower value. The handles come with a calibration certificate, which includes test measurements that confirm accuracy.

You can tighten fasteners that require less torque than the values listed, but the accuracy ratings apply only within the specified range.

Open End Heads

12-Point Sure-Grip

Opening—Nonratcheting

	Max. Torque	Opening Angle	Color		Each
12-Point Sure-Grip Opening—Nonratcheting



	5/16"	150 in·lbf	30°	Black	5347A161	000000


	7/16"	250 in·lbf	30°	Black	5347A163	00000
	1/2"	300 in·lbf	30°	Black	5347A164	00000
	9/16"	350 in·lbf	30°	Black	5347A165	00000
	5/8"	400 in·lbf	30°	Black	5347A166	00000
	3/4"	600 in·lbf	30°	Black	5347A168	00000
	7/8"	800 in·lbf	30°	Black	5347A171	00000
	15/16"	900 in·lbf	30°	Black	5347A172	000000

Open-End 6-Point Socket Sets

The sockets in these sets have a cutout and extra length so you can reach and twist nuts without having to disconnect your line. Connect them to a ratchet wrench to turn nuts around a wired sensor, fuel line, or hose without having to remove and reposition your wrench. The hex shape achieves the best possible grip on hex fasteners to prevent rounding their points. For use with hand-drive tools only.

Sockets—Chrome-Plated Steel

	Components Included	Includes	Container Type	Socket Shape	Drive Size, mm		Each
3/8" Square Drive



	10	10 Sockets	Deep: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm	Foam Tray	6-Point	10, 11, 12, 13, 14, 15, 16, 17, 18, 19	7983N101	0000000

Open-End 6-Point Sockets

Slide the open side of these sockets over a tube or hose to adjust a nut that’s already installed. You can turn them with ratchets, so they’re easier to use than open-end wrench heads—no need to pull the socket off the nut and reposition. The hex shape provides the best possible grip on hex fasteners and prevents rounding. Only use with hand-driven tools.

Chrome-Plated Steel

						Deep Clearance
	Drive Size, mm	OD	Opening Lg.	Socket Shape	For Drive Style	Overall Lg.		Each
3/8" Square Drive



		10	23/32"	27/32"	6-Point	External Hex	2 3/32"	93299A110	000000


		11	23/32"	27/32"	6-Point	External Hex	2 3/32"	93299A120	00000
		12	47/64"	27/32"	6-Point	External Hex	2 3/32"	93299A130	00000
		13	51/64"	1 1/8"	6-Point	External Hex	2 15/32"	93299A140	00000
		14	7/8"	1 1/8"	6-Point	External Hex	2 15/32"	93299A150	00000
		15	29/32"	1 7/16"	6-Point	External Hex	2 13/16"	93299A160	00000
		16	15/16"	1 7/16"	6-Point	External Hex	2 13/16"	93299A170	00000
		17	1"	1 5/8"	6-Point	External Hex	3 1/16"	93299A180	00000
		18	1 3/64"	1 13/16"	6-Point	External Hex	3 5/16"	93299A190	00000
		19	1 1/16"	2 1/16"	6-Point	External Hex	3 17/32"	93299A200	00000

Sure-Grip Strap Wrenches

While some wrenches require you hold the strap, these have a shackle that keeps the strap closed for extra turning force and quick adjustment. They're nonmarring and grip plastic pipe, tubing, hand wheels, filters, and objects with highly polished surfaces.

	Handle		Strap
For OD	Lg.	Material	Wd.	Lg.	Thk.	Material	Replaceable		Each
1 1/2" to 5"	12"	Aluminum	1"	22 1/4"	1/8"	Urethane-Coated Nylon	No	5349A31	000000
2 3/8" to 12"	24"	Iron	2 1/4"	54"	3/32"	Rubber-Coated Polyester Fabric	Yes	5349A14	000000
3" to 10"	18"	Aluminum	1 3/4"	34 1/4"	9/64"	Urethane-Coated Nylon	No	5349A32	00000

Replacement Straps

		Each
Replacement Strap for 2 1/4" Strap Wd. x 54" Strap Lg. Sure-Grip Wrench	5349A19	000000

Sure-Grip Chain Wrenches

Turn the adjustment screw and squeeze the handle to lock the chain in place; press the lever to release.

Wrenches									Replacement Chains		Extension Chain
	Handle		Chain
For OD	Lg.	Material	Lg.	Breaking Strength, lbf	Material	Replaceable		Each		Each		Each
11/16" to 5 11/16"	9"	Steel	18"	6,000	Steel	Yes	5376A14	000000	5376A18	000000	5376A16	000000