Natural Hard Fiber | McMaster-Carr

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Thickness

Shape

Width

Length

Performance

Electrically Insulating

Diameter

Electrical Insulation Rating

Poor

Good

Dielectric Strength

195 V/mil to 215 V/mil

200 V/mil to 215 V/mil

215 V/mil

300 V/mil

Not Rated

Tensile Strength Rating

Good

Not Rated

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

REACH

Compliant

RoHS

Compliant

Military Specification

MIL-F-1148

MIL-F-10336

MIL-I-695

Tensile Strength

9,000 psi to 21,000 psi

10,000 psi to 21,000 psi

Not Rated

Flexural Strength

13,000 psi to 15,000 psi

16,000 psi to 29,000 psi

Impact Strength

1.8 ft·lbf/in to 2.5 ft·lbf/in

Hardness

Water Absorption

Wall Thickness

80 Products

About Composites

Color: Gray
Max. Temperature: 235° F
Tensile Strength: 9,000-21,000 psi (Good)
Impact Strength: 1.8-2.5 ft.-lbs./in. (Good)
Hardness: See table
For Use Outdoors: No
Specifications Met: See table

Also known as vulcanized fiber, these hard fiber sheets can be readily machined and punched into custom parts. They're constructed from lightweight cotton fabric that's been chemically treated to make them hard and dense. Use hard fiber to make gears and bushings.

For technical drawings and 3-D models, click on a part number.

12" × 12"
Thick.	Thick. Tolerance	Hardness	Specifications Met		Each
0.02"	-0.002" to 0.002"	Rockwell R70 (Hard)	MIL-I-695, UL 94 HB	0000000	000000
0.03"	-0.003" to 0.003"	Rockwell R70 (Hard)	MIL-I-695, UL 94 HB	0000000	00000
1/16"	-0.005" to 0.005"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	00000
3/32"	-0.007" to 0.007"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	00000
1/8"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	00000
3/16"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	00000
1/4"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	00000
3/8"	-0.02" to 0.02"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
1/2"	-0.025" to 0.025"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
24" × 39"
0.02"	-0.002" to 0.002"	Rockwell R70 (Hard)	MIL-I-695, UL 94 HB	0000000	00000
0.03"	-0.003" to 0.003"	Rockwell R70 (Hard)	MIL-I-695, UL 94 HB	0000000	00000
1/16"	-0.005" to 0.005"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	00000
3/32"	-0.007" to 0.007"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
1/8"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
3/16"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
1/4"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
3/8"	-0.02" to 0.02"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
1/2"	-0.025" to 0.025"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
39" × 48"
0.02"	-0.002" to 0.002"	Rockwell R70 (Hard)	MIL-I-695, UL 94 HB	0000000	00000
0.03"	-0.003" to 0.003"	Rockwell R70 (Hard)	MIL-I-695, UL 94 HB	0000000	00000
1/16"	-0.005" to 0.005"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
3/32"	-0.007" to 0.007"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
1/8"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
3/16"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
1/4"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	000000
3/8"	-0.02" to 0.02"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	00000000
1/2"	-0.025" to 0.025"	Rockwell R80 (Hard)	MIL-F-10336, MIL-F-1148, UL 94 HB	0000000	00000000

Easy-to-Machine Hard Fiber Tubes

Color: Gray
Max. Temperature: 235° F
Tensile Strength: 9,000-21,000 psi (Good)
Impact Strength: 1.8-2.5 ft.-lbs./in. (Good)
Hardness: Rockwell R80 (Hard)
For Use Outdoors: No
Specifications Met: MIL-F-10336, MIL-F-1148, UL 94 HB

Readily machined and punched into custom parts, these hard fiber tubes are often made into bushings and washers. Also known as vulcanized fiber, they're constructed from lightweight cotton fabric that's been chemically treated to make it hard and dense.

For technical drawings and 3-D models, click on a part number.

Wall Thick.	Wall Thick. Tolerance	OD	OD Tolerance	ID	ID Tolerance	Lg.		Each
1/16"	-0.01" to 0.01"	9/16"	-0.005" to 0.005"	7/16"	-0.008" to 0.008"	40"	0000000	000000
1/16"	-0.01" to 0.01"	5/8"	-0.005" to 0.005"	1/2"	-0.008" to 0.008"	40"	0000000	00000
1/16"	-0.01" to 0.01"	7/8"	-0.005" to 0.005"	3/4"	-0.008" to 0.008"	40"	0000000	00000
1/16"	-0.01" to 0.01"	1"	-0.005" to 0.005"	7/8"	-0.008" to 0.008"	40"	0000000	00000
1/8"	-0.015" to 0.015"	11/16"	-0.005" to 0.005"	7/16"	-0.008" to 0.008"	40"	0000000	00000
1/8"	-0.01" to 0.01"	3/4"	-0.005" to 0.005"	1/2"	-0.008" to 0.008"	40"	0000000	00000
1/8"	-0.01" to 0.01"	1 1/4"	-0.008" to 0.008"	1"	-0.008" to 0.008"	40"	0000000	00000
1/8"	-0.01" to 0.01"	1 1/2"	-0.008" to 0.008"	1 1/4"	-0.01" to 0.01"	40"	0000000	00000
1/8"	-0.01" to 0.01"	1 3/4"	-0.008" to 0.008"	1 1/2"	-0.01" to 0.01"	40"	0000000	00000
1/8"	-0.01" to 0.01"	2 1/4"	-0.01" to 0.01"	2"	-0.01" to 0.01"	40"	0000000	00000

Easy-to-Machine Hard Fiber Rods

Color: Gray
Max. Temperature: 235° F
Tensile Strength: 9,000-21,000 psi (Good)
Impact Strength: 1.8-2.5 ft.-lbs./in. (Good)
Hardness: Rockwell R80 (Hard)
For Use Outdoors: No
Specifications Met: MIL-F-10336, MIL-F-1148, UL 94 HB

Frequently used to make gears and bushings, these hard fiber rods can be readily machined and punched into custom parts. They are constructed from lightweight cotton fabric that's been chemically treated to make them hard and dense. Hard fiber is also known as vulcanized fiber.

For technical drawings and 3-D models, click on a part number.

		45" Lg.
Dia.	Dia. Tolerance		Each
3/16"	-0.005" to 0.005"	0000000	000000
1/4"	-0.005" to 0.005"	0000000	00000
5/16"	-0.006" to 0.006"	0000000	00000
3/8"	-0.006" to 0.006"	0000000	00000
1/2"	-0.006" to 0.006"	0000000	00000
9/16"	-0.006" to 0.006"	0000000	000000
5/8"	-0.006" to 0.006"	0000000	000000
3/4"	-0.006" to 0.006"	0000000	000000

Electrically Insulating Hard Fiber

Color: Gray
Max. Temperature: 235° F
Tensile Strength: See Table
Impact Strength: 2.5 ft.-lbs./in. (Good)
Hardness: Rockwell R70 (Hard)
For Use Outdoors: No
Specifications Met: MIL-I-695, UL 94 HB

Widely known as fishpaper and vulcanized fiber, these thin sheets offer better electrical insulation than standard hard fiber sheets. They are constructed from lightweight cotton fabric that's been chemically treated to make it hard and dense.

For technical drawings and 3-D models, click on a part number.

6" × 12"
Thick.	Thick. Tolerance	Tensile Strength		Each
0.005"	-0.001" to 0.001"	Not Rated	00000000	00000
0.01"	-0.001" to 0.001"	Not Rated	00000000	0000
0.015"	-0.002" to 0.002"	Not Rated	00000000	0000
0.02"	-0.002" to 0.002"	Not Rated	00000000	0000
0.025"	-0.003" to 0.003"	Not Rated	00000000	00000
0.03"	-0.003" to 0.003"	Not Rated	00000000	00000
0.04"	-0.004" to 0.004"	Not Rated	00000000	00000
0.045"	-0.005" to 0.005"	Not Rated	00000000	00000
12" × 12"
0.005"	-0.001" to 0.001"	Not Rated	0000000	0000
0.01"	-0.001" to 0.001"	Not Rated	0000000	0000
0.015"	-0.002" to 0.002"	Not Rated	0000000	0000
0.02"	-0.002" to 0.002"	Not Rated	0000000	00000
0.025"	-0.003" to 0.003"	Not Rated	0000000	00000
0.03"	-0.003" to 0.003"	Not Rated	0000000	00000
0.04"	-0.004" to 0.004"	Not Rated	0000000	00000
0.045"	-0.005" to 0.005"	Not Rated	0000000	00000
0.062"	-0.007" to 0.007"	10,000-21,000 psi (Good)	0000000	00000
24" × 39"
0.005"	-0.001" to 0.001"	Not Rated	0000000	00000
0.01"	-0.001" to 0.001"	Not Rated	0000000	00000
0.015"	-0.002" to 0.002"	Not Rated	0000000	00000
0.02"	-0.002" to 0.002"	Not Rated	0000000	00000
0.025"	-0.003" to 0.003"	Not Rated	0000000	00000
0.03"	-0.003" to 0.003"	Not Rated	0000000	00000
0.04"	-0.004" to 0.004"	Not Rated	0000000	000000
0.045"	-0.005" to 0.005"	Not Rated	0000000	000000
0.062"	-0.007" to 0.007"	10,000-21,000 psi (Good)	0000000	000000
39" × 48"
0.005"	-0.001" to 0.001"	Not Rated	0000000	00000
0.01"	-0.001" to 0.001"	Not Rated	0000000	00000
0.015"	-0.002" to 0.002"	Not Rated	0000000	00000
0.02"	-0.002" to 0.002"	Not Rated	0000000	00000
0.025"	-0.003" to 0.003"	Not Rated	0000000	000000
0.03"	-0.003" to 0.003"	Not Rated	0000000	00000
0.062"	-0.007" to 0.007"	10,000-21,000 psi (Good)	0000000	000000
39" × 60"
0.01"	-0.001" to 0.001"	Not Rated	00000000	00000
0.015"	-0.002" to 0.002"	Not Rated	00000000	00000

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About Composites

Easy-to-Machine Hard Fiber Sheets

Easy-to-Machine Hard Fiber Tubes

Easy-to-Machine Hard Fiber Rods

Electrically Insulating Hard Fiber