Hard Fiber Fasteners | McMaster-Carr

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116 Products

Hard Fiber Washers

The least likely to scratch or mar delicate mounting surfaces, these washers are made of hardened cotton fiber. They are also naturally nonconductive, so they are a great choice for insulating nuts and screws to prevent unintended charges. However, fiber washers will break down faster than other washers and will need to be replaced more often.

For Screw Size	ID	OD	Thk.	Specs. Met	Color	Pkg. Qty.	Pkg.
No. 2	0.094"	0.250"	0.010" to 0.020"	—	Black	100	000000
No. 2	0.094"	0.250"	0.014" to 0.016"	—	Gray	100	0000
No. 2	0.094"	0.250"	0.028" to 0.034"	—	Red	100	0000
No. 4	0.125"	0.250"	0.014" to 0.016"	—	Gray	100	0000
No. 4	0.125"	0.250"	0.028" to 0.034"	—	Red	100	0000
No. 4	0.125"	0.312"	0.010" to 0.020"	—	Black	100	00000
No. 4	0.126"	0.375"	0.036" to 0.044"	—	Black	10	00000
No. 5	0.141"	0.312"	0.036" to 0.044"	—	Black	10	00000
No. 6	0.145"	0.375"	0.026" to 0.036"	—	Black	100	00000
No. 6	0.156"	0.312"	0.014" to 0.016"	—	Gray	100	0000
No. 6	0.156"	0.312"	0.028" to 0.034"	—	Red	100	0000
No. 8	0.172"	0.375"	0.026" to 0.036"	—	Black	100	00000
No. 8	0.188"	0.375"	0.014" to 0.016"	—	Gray	100	0000
No. 8	0.188"	0.375"	0.028" to 0.034"	—	Red	100	0000
No. 8	0.188"	0.438"	0.036" to 0.044"	—	Black	10	0000
No. 10	0.203"	0.375"	0.042" to 0.052"	—	Black	100	00000
No. 10	0.203"	0.438"	0.041" to 0.051"	—	Black	100	00000
No. 10	0.203"	0.500"	0.036" to 0.044"	—	Black	10	0000
No. 12	0.234"	0.500"	0.042" to 0.052"	—	Black	50	0000
1/4"	0.250"	0.375"	0.014" to 0.016"	—	Gray	100	0000
1/4"	0.250"	0.375"	0.028" to 0.034"	—	Red	100	0000
1/4"	0.250"	0.500"	0.014" to 0.016"	—	Gray	100	0000
1/4"	0.250"	0.500"	0.028" to 0.034"	—	Red	100	0000
1/4"	0.281"	0.625"	0.057" to 0.067"	ASME B18.21.1	Black	25	00000
5/16"	0.312"	0.438"	0.014" to 0.016"	—	Gray	100	0000
5/16"	0.312"	0.438"	0.028" to 0.034"	—	Red	100	0000
5/16"	0.312"	0.562"	0.014" to 0.016"	—	Gray	100	0000
5/16"	0.312"	0.562"	0.028" to 0.034"	—	Red	100	0000
5/16"	0.325"	0.688"	0.057" to 0.067"	—	Black	100	00000
3/8"	0.375"	0.500"	0.014" to 0.016"	—	Gray	100	0000
3/8"	0.375"	0.500"	0.028" to 0.034"	—	Red	100	0000
3/8"	0.375"	0.625"	0.014" to 0.016"	—	Gray	100	0000
3/8"	0.375"	0.625"	0.028" to 0.034"	—	Red	100	0000
3/8"	0.375"	2.250"	0.120" to 0.130"	—	Gray	10	00000
3/8"	0.406"	0.875"	0.088" to 0.098"	—	Black	25	00000
7/16"	0.438"	0.625"	0.014" to 0.016"	—	Gray	50	0000
7/16"	0.438"	0.625"	0.028" to 0.034"	—	Red	100	0000
1/2"	0.500"	0.625"	0.028" to 0.034"	—	Red	100	0000
1/2"	0.500"	0.688"	0.014" to 0.016"	—	Gray	100	0000
1/2"	0.500"	0.688"	0.028" to 0.034"	—	Red	100	0000
1/2"	0.500"	0.750"	0.014" to 0.016"	—	Gray	100	0000
1/2"	0.500"	0.750"	0.028" to 0.034"	—	Red	100	0000
1/2"	0.500"	2.250"	0.120" to 0.130"	—	Gray	10	00000
1/2"	0.531"	1.000"	0.088" to 0.098"	—	Black	25	00000
9/16"	0.562"	0.812"	0.014" to 0.016"	—	Gray	100	00000
9/16"	0.562"	0.812"	0.028" to 0.034"	—	Red	100	0000
5/8"	0.625"	0.750"	0.028" to 0.034"	—	Red	100	0000
5/8"	0.625"	0.875"	0.014" to 0.016"	—	Gray	50	0000
5/8"	0.625"	0.875"	0.028" to 0.034"	—	Red	100	0000
5/8"	0.625"	2.250"	0.120" to 0.130"	—	Gray	10	00000
5/8"	0.645"	1.063"	0.088" to 0.098"	—	Black	25	00000
5/8"	0.656"	1.312"	0.086" to 0.100"	—	Black	5	0000
5/8"	0.688"	0.938"	0.028" to 0.034"	—	Red	100	0000
3/4"	0.750"	1.000"	0.014" to 0.016"	—	Gray	100	0000
3/4"	0.750"	1.000"	0.028" to 0.034"	—	Red	100	0000
3/4"	0.750"	1.063"	0.028" to 0.034"	—	Red	100	0000
3/4"	0.750"	2.250"	0.110" to 0.140"	—	Gray	10	00000
3/4"	0.810"	1.125"	0.110" to 0.140"	—	Black	10	00000
3/4"	0.812"	1.125"	0.014" to 0.016"	—	Gray	100	0000
3/4"	0.812"	1.125"	0.028" to 0.034"	—	Red	50	0000
7/8"	0.875"	1.188"	0.014" to 0.016"	—	Gray	100	0000
7/8"	0.875"	1.188"	0.028" to 0.034"	—	Red	100	00000
7/8"	0.875"	2.250"	0.120" to 0.130"	—	Gray	10	00000
7/8"	0.930"	1.250"	0.120" to 0.130"	—	Black	10	00000
7/8"	0.938"	1.250"	0.028" to 0.034"	—	Red	50	0000
1"	1.000"	1.250"	0.014" to 0.016"	—	Gray	100	0000
1"	1.000"	1.250"	0.028" to 0.034"	—	Red	100	00000
1"	1.000"	2.250"	0.120" to 0.130"	—	Gray	10	00000
1"	1.031"	1.312"	0.014" to 0.016"	—	Gray	50	00000
1"	1.031"	1.312"	0.028" to 0.034"	—	Red	50	0000
1"	1.125"	2.000"	0.120" to 0.130"	—	Black	10	00000
1 1/8"	1.188"	1.562"	0.028" to 0.034"	—	Red	100	00000
1 1/4"	1.250"	1.625"	0.028" to 0.034"	—	Red	50	00000
1 1/4"	1.312"	2.125"	0.120" to 0.130"	—	Black	5	00000
M1.2	1.3 mm	3.8 mm	0.2 mm to 0.3 mm	DIN 125	Black	10	00000
M1.4	1.5 mm	3.8 mm	0.2 mm to 0.3 mm	DIN 125	Black	10	00000
M1.6	1.7 mm	3.9 mm	0.2 mm to 0.3 mm	DIN 125	Black	10	00000
M2	2.3 mm	5 mm	0.3 mm to 0.4 mm	DIN 125	Black	25	00000
M2.5	2.7 mm	6.5 mm	0.4 mm to 0.6 mm	DIN 125	Black	100	00000
M3	3.2 mm	7 mm	0.4 mm to 0.6 mm	DIN 125	Black	100	00000
M3.5	3.7 mm	7.8 mm	0.5 mm to 0.6 mm	DIN 125	Black	10	00000
M4	4.3 mm	9 mm	0.7 mm to 0.9 mm	DIN 125	Black	100	00000
M6	6.4 mm	12.5 mm	1.4 mm to 1.7 mm	DIN 125	Black	50	0000
M7	7.4 mm	13.8 mm	1.4 mm to 1.7 mm	DIN 125	Black	10	00000
M8	8.4 mm	17 mm	1.4 mm to 1.7 mm	DIN 125	Black	50	0000
M10	10.5 mm	21 mm	1.8 mm to 2.2 mm	DIN 125	Black	50	00000
M12	13 mm	24 mm	2.1 mm to 2.5 mm	DIN 125	Black	50	00000
M16	17 mm	30 mm	2.1 mm to 2.5 mm	DIN 125	Black	25	0000
M20	21 mm	37 mm	2.1 mm to 2.5 mm	DIN 125	Black	25	00000
M24	25 mm	44 mm	2.8 mm to 3.5 mm	DIN 125	Black	10	0000
M30	31 mm	56 mm	2.8 mm to 3.6 mm	DIN 125	Black	10	00000

Insulating Sleeve Washers

Cover screw threads to stop electrical current in its tracks and prevent short circuits. These washers create a barrier between the screw threads and the mating surface when mounted in through holes. This barrier also extends the life of your assembly by preventing galvanic corrosion, which is when two different metals rust more quickly due to contact with each other.

Flat Edge

The flat edge distributes weight evenly to take pressure off screw heads.

Hard Fiber—The least likely to scratch or mar delicate mounting surfaces, such as printed circuit boards. These washers provide a moderate amount of electrical insulation, but they don't block current as well as plastic or ceramic washers.

		Sleeve						Temp. Range
	For Screw Size	Ht.	OD	ID	OD	Thk.	Overall Ht.	Min.	Max., ° F	Color	Pkg. Qty.		Pkg.
Hard Fiber



		No. 2	0.025"	0.154"	0.090"	0.250"	0.030"	0.055"	Not Rated	230	Black	50	000000000	000000


		No. 4	0.025"	0.186"	0.116"	0.250"	0.030"	0.055"	Not Rated	230	Black	50	000000000	00000
		No. 6	0.030"	0.186"	0.142"	0.313"	0.040"	0.070"	Not Rated	230	Black	50	000000000	0000
		No. 8	0.030"	0.246"	0.168"	0.375"	0.040"	0.070"	Not Rated	230	Black	50	000000000	00000
		No. 10	0.030"	0.312"	0.194"	0.375"	0.040"	0.070"	Not Rated	230	Black	50	000000000	00000
		1/4"	0.030"	0.312"	0.254"	0.500"	0.040"	0.070"	Not Rated	230	Black	50	000000000	00000
		3/8"	0.040"	0.437"	0.380"	0.625"	0.060"	0.100"	Not Rated	230	Black	50	000000000	00000

Sealing Washers

Prevent leaks while distributing weight evenly under nuts and screws. These washers compress as you tighten to keep air and fluid in, and dust and contaminants out. Use them anywhere you need a tight seal, such as protecting electronics from moisture or keeping lubricants contained in machinery.

Hard Fiber

An economical alternative to metal crush washers, these compress easily to create a seal with less effort. However, fiber washers degrade faster than metal washers and aren't as heat resistant. They also don't seal quite as tightly as their plastic or rubber counterparts. These washers are reusable, as long as the material isn't damaged.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
Hard Fiber



	M5	5	8	0.8	DIN 7603	100	000000000	00000


	M5	5	10	0.8	DIN 7603	100	000000000	0000
	M6	6	9	0.8	DIN 7603	100	000000000	0000
	M6	6	10	0.8	DIN 7603	100	000000000	0000
	M8	8	12	0.8	DIN 7603	100	000000000	0000
	M8	8	14	0.8	DIN 7603	100	000000000	0000
	M10	10	14	0.8	DIN 7603	100	000000000	0000
	M10	10	16	1	DIN 7603	100	000000000	0000
	M12	12	16	0.8	DIN 7603	100	000000000	0000
	M12	12	18	1	DIN 7603	100	000000000	0000
	M12	12	20	0.8	DIN 7603	100	000000000	0000


	M12	12	24	0.8	DIN 7603	100	000000000	0000
	M14	14	18	1	DIN 7603	100	000000000	0000
	M14	14	24	0.8	DIN 7603	100	000000000	0000
	M16	16	21	0.8	DIN 7603	100	000000000	0000
	M18	18	22	0.8	DIN 7603	100	000000000	0000
	M18	18	24	0.8	DIN 7603	100	000000000	0000
	M22	22	27	0.8	DIN 7603	100	000000000	0000