Aluminum Jam Nuts | McMaster-Carr

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21 Products

About Hex Nuts

Choose a hex nut with the right profile, material, and strength for your application.

Thin-Profile Hex Nuts

About half the height of standard-profile nuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against another hex nut to hold it in place.

Lightweight Aluminum

6061 Aluminum—One-third the weight of steel, these nuts are commonly used in robotics, automation, and other applications that have weight limitations. They're an alternative to stainless steel for rust resistance but are not as strong.

	Wd.	Ht.	Specs. Met	Pkg. Qty.		Pkg.
6061 Aluminum



	1/4"-20	7/16"	5/32"	ASME B18.2.2	5	000000000	000000


	5/16"-18	1/2"	3/16"	ASME B18.2.2	5	000000000	00000
	3/8"-16	9/16"	7/32"	ASME B18.2.2	5	000000000	00000
	1/2"-13	3/4"	5/16"	ASME B18.2.2	5	000000000	00000

Knurled-Head Thumb Nuts

Get a good grip on these nuts, even with oily fingers. They have a raised, slip-resistant head, so you can tighten them by hand and make controlled adjustments. Knurled-head nuts have a smaller profile than wing nuts, so they fit in tighter spots.

Plastic

Reinforced Acetal—The best plastic for damp and wet environments, acetal won't swell or lose strength if exposed to moisture. These nuts are reinforced with an aluminum threaded insert, so they can handle more torque than other plastic nuts and won't crack during installation.

		Collar
	Thread Size	Dia.	Ht.	Head Dia.	Ht.	Color	Threading	Insert Material	Pkg. Qty.		Pkg.
Reinforced Acetal



		4-40	9/32"	3/64"	5/16"	3/16"	Black	Fully Threaded	Aluminum	10	000000000	00000


		6-32	23/64"	3/64"	3/8"	7/32"	Black	Fully Threaded	Aluminum	10	000000000	0000
		8-32	25/64"	3/32"	1/2"	17/64"	Black	Fully Threaded	Aluminum	10	000000000	0000
		10-24	31/64"	1/8"	5/8"	19/64"	Black	Fully Threaded	Aluminum	10	000000000	0000
		10-32	31/64"	1/8"	5/8"	19/64"	Black	Fully Threaded	Aluminum	10	000000000	0000
		1/4"-20	35/64"	1/16"	1"	23/64"	Black	Fully Threaded	Aluminum	10	000000000	00000
		1/4"-20	35/64"	3/16"	3/4"	23/64"	Black	Fully Threaded	Aluminum	10	000000000	00000
		1/4"-28	35/64"	1/16"	1"	23/64"	Black	Fully Threaded	Aluminum	10	000000000	00000
		1/4"-28	35/64"	3/16"	3/4"	23/64"	Black	Fully Threaded	Aluminum	10	000000000	00000
		5/16"-18	41/64"	1/8"	1"	27/64"	Black	Fully Threaded	Aluminum	10	000000000	00000
		5/16"-24	41/64"	1/8"	1"	27/64"	Black	Fully Threaded	Aluminum	10	000000000	00000


		M3 × 0.5 mm	9.1 mm	1.2 mm	9.6 mm	5.6 mm	Black	Fully Threaded	Aluminum	10	000000000	0000
		M4 × 0.7 mm	9.9 mm	2.4 mm	13 mm	6.7 mm	Black	Fully Threaded	Aluminum	10	000000000	0000
		M5 × 0.8 mm	11.5 mm	3.2 mm	16 mm	7.5 mm	Black	Fully Threaded	Aluminum	10	000000000	0000
		M6 × 1 mm	13.6 mm	4.8 mm	19 mm	9.1 mm	Black	Fully Threaded	Aluminum	10	000000000	00000
		M6 × 1 mm	14.3 mm	1.6 mm	26 mm	9.1 mm	Black	Fully Threaded	Aluminum	10	000000000	00000
		M8 × 1.25 mm	16.3 mm	3.2 mm	26 mm	10.7 mm	Black	Fully Threaded	Aluminum	10	000000000	00000