Machine Key Assortments | McMaster-Carr

	Key Type Key Type


Straight	Woodruff

Rounded	Step

	System of Measurement System of Measurement

Inch

Metric

	Material Material

Steel

1035 Carbon Steel

Stainless Steel

	Finish Finish

Zinc Plated

Gold Dichromate Plated

	Number of Pieces Number of Pieces

	Tolerance Rating Tolerance Rating

Undersized

Oversized

Standard

	Container Type Container Type

Plastic Box

Cardboard Box

Cardboard Tube

	Container Features Container Features

Compartmented

Lid Chart

	Rounded Keys Included Rounded Keys Included

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

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18 Products

Undersized Machine Key Assortments

Key Assortment

These keys are slightly undersized to fit in standard keyways. Made from zinc-plated steel, they resist corrosion in wet environments.

Straight Key Assortments

Straight Key

Zinc-Plated 1018-1045 Carbon Steel
Number of Pieces	Straight Keys Included	Size Tolerance	Container Type		Each
58	1/8" × 1/8" × 3/4" Lg. (3 Pieces) 1/8" × 1/8" × 1" Lg. (3 Pieces) 3/16" × 3/16" × 3/4" Lg. (5 Pieces) 3/16" × 3/16" × 1" Lg. (5 Pieces) 3/16" × 3/16" × 1 1/4" Lg. (5 Pieces) 1/4" × 1/4" × 3/4" Lg. (5 Pieces) 1/4" × 1/4" × 1 1/4" Lg. (5 Pieces) 1/4" × 1/4" × 1 1/2" Lg. (5 Pieces) 5/16" × 5/16" × 1 1/4" Lg. (5 Pieces) 5/16" × 5/16" × 1 1/2" Lg. (5 Pieces) 3/8" × 3/8" × 1 1/4" Lg. (5 Pieces) 3/8" × 3/8" × 1 1/2" Lg. (5 Pieces) 1/2" × 1/2" × 1 1/2" Lg. (2 Pieces)	-0.003" to 0"	Plastic Box	000000000	0000000
Zinc-Plated Steel
300	1/8" × 1/8" × 3/4" Lg. (25 Pieces) 1/8" × 1/8" × 1" Lg. (25 Pieces) 3/16" × 3/16" × 3/4" Lg. (25 Pieces) 3/16" × 3/16" × 1" Lg. (25 Pieces) 3/16" × 3/16" × 1-1/4" Lg. (25 Pieces) 3/16" × 3/16" × 1-1/2" Lg. (25 Pieces) 1/4" × 1/4" × 3/4" Lg. (25 Pieces) 1/4" × 1/4" × 1-1/4" Lg. (25 Pieces) 1/4" × 1/4" × 1" Lg. (25 Pieces) 1/4" × 1/4" × 1-1/2" Lg. (25 Pieces) 5/16" × 5/16" × 1-1/4" Lg. (25 Pieces) 5/16" × 5/16" × 1-1/2" Lg. (25 Pieces)	-0.002" to 0"	Plastic Box	000000000	000000

Rounded Key Assortments

Rounded Key

Zinc-Plated Steel
Number of Pieces	Rounded Keys Included	Size Tolerance, mm	Container Type		Each
25	4 mm × 4 mm × 80 mm Lg. (2 Pieces) 5 mm × 5 mm × 80 mm Lg. (3 Pieces) 6 mm × 6 mm × 80 mm Lg. (2 Pieces) 7 mm × 7 mm × 80 mm Lg. (2 Pieces) 8 mm × 7 mm × 80 mm Lg. (2 Pieces) 8 mm × 8 mm × 80 mm Lg. (3 Pieces) 10 mm × 8 mm × 80 mm Lg. (2 Pieces) 10 mm × 10 mm × 80 mm Lg. (2 Pieces) 12 mm × 8 mm × 80 mm Lg. (2 Pieces) 12 mm × 12 mm × 80 mm Lg. (2 Pieces) 16 mm × 10 mm × 80 mm Lg. (1 Piece) 18 mm × 11 mm × 80 mm Lg. (1 Piece) 20 mm × 12 mm × 80 mm Lg. (1 Piece)	-0.03 to 0	Plastic Box	000000000	0000000
58	4 mm × 4 mm × 40 mm Lg. (8 Pieces) 5 mm × 5 mm × 40 mm Lg. (8 Pieces) 6 mm × 6 mm × 40 mm Lg. (10 Pieces) 8 mm × 7 mm × 40 mm Lg. (4 Pieces) 8 mm × 8 mm × 40 mm Lg. (10 Pieces) 10 mm × 8 mm × 40 mm Lg. (4 Pieces) 10 mm × 10 mm × 40 mm Lg. (4 Pieces) 12 mm × 12 mm × 40 mm Lg. (4 Pieces) 14 mm × 9 mm × 40 mm Lg. (4 Pieces) 16 mm × 10 mm × 40 mm Lg. (2 Pieces)	-0.03 to 0	Plastic Box	000000000	000000

Standard Key Stock Assortments

Key Assortment

Straight Key

These assortments include various sizes of key stock—choose a piece and cut it to your desired length. A gold dichromate finish makes it easy to read the sizing on each piece.

Gold-Dichromate Plated Steel
Number of Pieces	Straight Keys Included	Size Tolerance, mm	Container Type		Each
32	4 mm × 4 mm × 12" Lg. (6 Pieces) 5 mm × 5 mm × 12" Lg. (6 Pieces) 6 mm × 6 mm × 12" Lg. (6 Pieces) 8 mm × 8 mm × 12" Lg. (6 Pieces) 10 mm × 10 mm × 12" Lg. (4 Pieces) 12 mm × 12 mm × 12" Lg. (4 Pieces)	-0.03 to 0.03	Cardboard Box	00000000	0000000

Oversized Key Stock Assortments

Make a key that is the exact length you need. Slightly larger than the size listed, these oversized keys offer a tight fit in worn keyways.

Zinc-plated steel key stock resists corrosion in wet environments.

18-8 stainless steel key stock is chemical resistant and may be mildly magnetic.

Zinc-Plated 1018-1045 Carbon Steel
Number of Pieces	Straight Keys Included	Size Tolerance	Container Type		Each
7	1/8" × 1/8" × 12" Lg. (1 Piece) 3/16" × 3/16" × 12" Lg. (1 Piece) 3/16" × 1/4" × 12" Lg. (1 Piece) 1/4" × 5/16" × 12" Lg. (1 Piece) 5/16" × 3/8" × 12" Lg. (1 Piece) 3/8" × 7/16" × 12" Lg. (1 Piece) 7/16" × 1/2" × 12" Lg. (1 Piece)	0" to 0.003"	Cardboard Box	000000000	000000
31	1/8" × 1/8" × 12" Lg. (5 Pieces) 3/16" × 3/16" × 12" Lg. (5 Pieces) 1/4" × 1/4" × 12" Lg. (5 Pieces) 5/16" × 5/16" × 12" Lg. (5 Pieces) 3/8" × 3/8" × 12" Lg. (5 Pieces) 7/16" × 7/16" × 12" Lg. (3 Pieces) 1/2" × 1/2" × 12" Lg. (3 Pieces)	0" to 0.003"	Cardboard Box	000000000	00000
18-8 Stainless Steel
7	1/8" × 1/8" × 12" Lg. (1 Piece) 3/16" × 3/16" × 12" Lg. (1 Piece) 1/4" × 1/4" × 12" Lg. (1 Piece) 5/16" × 5/16" × 12" Lg. (1 Piece) 3/8" × 3/8" × 12" Lg. (1 Piece) 7/16" × 7/16" × 12" Lg. (1 Piece) 1/2" × 1/2" × 12" Lg. (1 Piece)	0" to 0.003"	Cardboard Tube	000000000	00000
31	1/8" × 1/8" × 12" Lg. (5 Pieces) 3/16" × 3/16" × 12" Lg. (5 Pieces) 1/4" × 1/4" × 12" Lg. (5 Pieces) 5/16" × 5/16" × 12" Lg. (5 Pieces) 3/8" × 3/8" × 12" Lg. (5 Pieces) 7/16" × 7/16" × 12" Lg. (3 Pieces) 1/2" × 1/2" × 12" Lg. (3 Pieces)	0" to 0.003"	Cardboard Box	000000000	000000

Oversized Machine Key Assortments

Slightly larger than the size listed, these oversized keys offer a tight fit in worn keyways.

1018-1045 Carbon Steel
Number of Pieces	Straight Keys Included	Size Tolerance, mm	Container Type	Specifications Met		Each
25	4 mm × 4 mm × 3 3/8" Lg. (2 Pieces) 5 mm × 5 mm × 3 3/8" Lg. (2 Pieces) 6 mm × 6 mm × 3 3/8" Lg. (3 Pieces) 7 mm × 7 mm × 3 3/8" Lg. (2 Pieces) 7 mm × 8 mm × 3 3/8" Lg. (2 Pieces) 8 mm × 8 mm × 3 3/8" Lg. (3 Pieces) 8 mm × 10 mm × 3 3/8" Lg. (2 Pieces) 8 mm × 12 mm × 3 3/8" Lg. (2 Pieces) 10 mm × 10 mm × 3 3/8" Lg. (2 Pieces) 10 mm × 16 mm × 3 3/8" Lg. (1 Piece) 11 mm × 18 mm × 3 3/8" Lg. (1 Piece) 12 mm × 12 mm × 3 3/8" Lg. (2 Pieces) 12 mm × 20 mm × 3 3/8" Lg. (1 Piece)	0 to 0.076	Plastic Box	DIN 6885	000000000	000000

Woodruff Key Assortments

A rounded bottom allows these keys to rock in their seat to relieve stress on the shaft caused by vibration or misalignment.

Zinc-plated steel keys have good corrosion resistance.

316 stainless steel keys have excellent chemical and corrosion resistance. However, they’re not as strong as steel and zinc-plated steel keys.

Zinc-Plated 1035 Carbon Steel
Number of Pieces	Woodruff Keys Included	Material	Container Type		Each
250	Key Number 5 (30 each) Key Numbers A, 10, 11, 12, 61, 91 (5 Each) Key Numbers 2, 3, 7, 9, 212 (20 Each) Key Numbers 1, 4, 8, 211, 213 (10 Each) Key Number 6 (40 Each)	Zinc-Plated 1035 Carbon Steel	Plastic Box	000000000	000000
1035 Carbon Steel
30	Key Number 3 (10 each) Key Numbers A, 9, and 15 (4 Each) Key Number 6 (8 Each)	1035 Carbon Steel	Plastic Box	000000000	00000
350	Key Size 8 mm × 11 mm (15 Each) Key Size 2.5 mm × 3.7 mm (25 Each) Key Size 5 mm × 10 mm (15 Each) Key Size 2 mm × 5 mm (25 Each) Key Size 6 mm × 9 mm (15 Each) Key Size 4 mm × 5 mm (25 Each) Key Size 2 mm × 2.6 mm (25 Each) Key Size 6 mm × 7.5 mm (15 Each) Key Size 5 mm × 7.5 mm (20 Each) Key Size 4 mm × 7.5 mm (25 Each) Key Size 3 mm × 6.5 mm (25 Each) Key Size 8 mm × 13 mm (15 Each) Key Size 5 mm × 9 mm (20 Each) Key Size 10 mm × 13 mm (10 Each) Key Size 1.5 mm × 2.6 mm (25 Each) Key Size 6 mm × 11 mm (15 Each) Key Size 10 mm × 16 mm (10 Each) Key Size 3 mm × 3.7 mm (25 Each)	1035 Carbon Steel	Plastic Box	000000000	000000
1018-1045 Carbon Steel
97	Key Numbers 18 and G (5 Each) Key Numbers 1, 2, 4, 5, 16, 19, 12, 14, 17, 20, 21, 22, 24, D, 23, E, 26, 27, 28, and 29 (1 Each) Key Numbers 3, 7, 6, 8, and 91 (4 Each) Key Number 9 (12 Each) Key Numbers 10, 13, 15, B, and 152 (3 Each) Key Numbers 11 and A (10 Each)	1018-1045 Carbon Steel	Plastic Box	000000000	00000
225	Key Numbers 11, 13, and A (10 Each) Key Numbers 15, 18, and E (5 Each) Key Numbers 211, 212, 213, 1, 2, 3, 5, 7, 6, 61, 9, and 91 (15 Each)	1018-1045 Carbon Steel	Plastic Box	000000000	000000
316 Stainless Steel
66	Key Numbers 5, 6, 7, 8, 9, 61, 91 (4 Each) Key Numbers 1, 2, 3, 211, 212, 213 (5 Each) Key Numbers 11, A (3 Each) Key Number 15 (2 Each)	316 Stainless Steel	Plastic Box	000000000	000000

Step Key Assortments

For Gears

For Shafts

For Gears

For Shafts

Also known as offset key stock, use step keys to repair keyways in gears and shafts. Made from zinc-plated steel, they resist corrosion in wet environments.

Zinc-Plated 1018-1045 Carbon Steel
Number of Pieces	Step Keys for Gears Included	Step Keys for Shafts Included	Tolerance Rating	Container Type		Each
7	3/16" (A) × 3/32" (B) × 1/8" (C) × 1/16" (D) × 5/32" Ht. × 12" Lg. (1 Piece) 3/8" (A) × 3/16" (B) × 5/16" (C) × 5/32" (D) × 11/32" Ht. × 12" Lg. (1 Piece)	3/16" (A) × 3/32" (B) 1/4" (C) × 1/8" (D) × 7/32" Ht. × 12" Lg. (1 Piece) 1/4" (A) × 1/8" (B) 5/16" (C) × 1/8" (D) × 1/4" Ht. × 12" Lg. (1 Piece) 1/4" (A) × 1/8" (B) 3/8" (C) × 3/16" (D) × 5/16" Ht. × 12" Lg. (1 Piece) 3/8" (A) × 3/16" (B) 1/2" (C) × 1/4" (D) × 7/16 Ht. × 12" Lg. (1 Piece) 1/2" (A) × 1/4" (B) 5/8" (C) × 5/16" (D) × 9/16" Ht. × 12" Lg. (1 Piece)	Oversized	Cardboard Box	000000000	000000

Machine Key and Woodruff Key Assortments


	Straight Key
	Woodruff Key

1018-1045 Carbon Steel
Number of Pieces	Straight Keys Included	Woodruff Keys Included	Container Type		Each
401	1/8" × 1/8" × 1 1/2" Lg. (50 Pieces) 3/16" × 1/4" × 1 1/2" Lg. (25 Pieces) 3/16" × 3/16" × 1 1/2" Lg. (30 Pieces) 1/4" × 1/4" × 1 1/2" Lg. (18 Pieces) 5/16" × 5/16" × 1 1/2" Lg. (15 Pieces) 3/8" × 3/8" × 1 1/2" Lg. (15 Pieces)	Key Numbers 3 and 5 (45 Each) Key Numbers 6 and 7 (22 Each) Key Number 9 (30 Each) Key Numbers 10 and A (15 Each) Key Number 13 (12 Each) Key Number 15 (20 Each) Key Numbers C and 21 (9 Each) Key Number G (4 Each)	Plastic Box	000000000	0000000