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About Plastic
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About Carbon Steel, Alloy Steel, Spring Steel, and Cast Iron
More
About Tool Steel
More
About Aluminum
More
Low-Carbon Steel Rods and Discs
- Yield Strength: See table
- Hardness: See table
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: See table
- Specifications Met: See table
Also known as mild steel, low-carbon steel is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength, such as fixture clamps, mounting plates, and spacers. This material can be surface hardened with heat treating.
For technical drawings and 3-D models, click on a part number.
Oversized Easy-to-Machine
Gray Cast Iron Rods and Discs
- Yield Strength: Not Rated
- Hardness: Rockwell C20 (Hard)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Rockwell C50
- Specifications Met: ASTM A247
An oversized diameter allows for finishing to your exact requirements. Gray cast iron machines faster with less wear on cutting tools than most types of steel. It also absorbs vibration, so finished parts run quieter than those made of steel. It's often used for gears, pulleys, rollers, and bushings.
Impact-Resistant Ductile Cast Iron Rods and Discs
- Yield Strength: 55,000 psi
- Hardness: Rockwell C20 (Hard)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Rockwell C60
- Specifications Met: ASTM A536
Ductile cast iron is strong, resilient, and able to handle repeated stress without breaking. It also absorbs vibration, so finished parts run quieter than those made of steel.
Multipurpose 6061 Aluminum Rods and Discs
- Yield Strength: 35,000 psi
- Hardness:
Foot and inch sizes: Brinell 95 (Soft)
Metric sizes: Brinell 80 (Soft) - Temper: See table
- Fabrication: See table
- Specifications Met:
Cold Worked: ASTM B211
Extruded: ASTM B221
The most widely used aluminum, 6061 is fabricated into everything from pipe fittings and containers to automotive and aerospace parts. It is strong and corrosion resistant, plus it's easy to machine and weld.
Tight-Tolerance Multipurpose
6061 Aluminum Rods and Discs
These rods and discs are precision ground to offer tighter tolerances than standard 6061 rods and discs. The most widely used aluminum, 6061 is fabricated into everything from pipe fittings and containers to automotive and aerospace parts. It is strong and corrosion resistant, plus it's easy to machine and weld.
Discs are consistently flat on the top and bottom, so they're ready for use in your CNC machine. They're also known as blanks.
Certificates with a traceable lot number are available for these products. Download certificates from ACTIVITY after your order ships.
- Yield Strength: 35,000 psi
- Hardness: Brinell 95 (Soft)
- Temper: T6511
- Fabrication : Extruded
- Specifications Met: ASTM B221
Easy-to-Machine MIC6 Cast Aluminum Discs
- Yield Strength: 15,000 psi
- Hardness: Brinell 65 (Soft)
- Temper: Not Rated
- Fabrication: Cast
MIC6 is cast from a high-strength 7000-series aluminum, then stress relieved to maintain dimensional stability during high-speed machining. Use these discs for CNC routing tables, assembly jigs, vacuum chucks, and other applications where consistent flatness and tight tolerances are critical.
Hardened Easy-to-Machine P20 Tool Steel
- Yield Strength: 101,000 psi
- Hardness: Rockwell C25 (Hard)
Furnished hardened, P20 tool steel is strong and easy to machine. It has the wear resistance and highly polishable surface needed to fabricate long-lasting molds and dies.
| Dia. | Dia. Tolerance | Mechanical Finish | Straightness Tolerance | Each | |
1/2" Lg. | |||||
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| 10" | 0.1" to 0.125" | Ground | 3/16" per ft. | 0000000 | 0000000 |
1" Lg. | |||||
| 10" | 0.1" to 0.125" | Ground | 3/16" per ft. | 0000000 | 000000 |
1 1/2" Lg. | |||||
| 10" | 0.1" to 0.125" | Ground | 3/16" per ft. | 0000000 | 000000 |
2 1/2" Lg. | |||||
| 10" | 0.1" to 0.125" | Ground | 3/16" per ft. | 0000000 | 000000 |
4" Lg. | |||||
| 10" | 0.1" to 0.125" | Ground | 3/16" per ft. | 0000000 | 000000 |
6" Lg. | |||||
| 10" | 0.1" to 0.125" | Ground | 3/16" per ft. | 0000000 | 000000 |
Wear-Resistant Easy-to-Machine
Delrin® Acetal Resin Rods and Discs
Because these naturally slippery, wear-resistant rods and discs resist expanding when exposed to heat and moisture, they can be easily machined to close tolerances. They are a good choice for parts that require precision, such as gears, bushings, and bearings. Delrin® acetal resin is also known as acetal homopolymer; it is stronger and stiffer than acetal copolymer.
- Color: White or Black
- Temperature Range: -20° to 180° F
- Tensile Strength: 10,000-11,000 psi (Good)
- Impact Strength: 1-1.5 ft.-lbs./in. (Poor)
- Hardness: Rockwell R120-R122 (Hard)
- For Use Outdoors: No
- Specifications Met:
White: ASTM D6100, Made of FDA Listed Material, NSF/ANSI Standard 51 for Food Contact
Black: ASTM D6100
Wear-Resistant Easy-to-Machine Acetal Rods and Discs
- Color: White or Black
- Temperature Range: -20° to 180° F
- Tensile Strength: 9,135-9,700 psi (Good)
- Impact Strength: 1-1.5 ft.-lbs./in. (Poor)
- Hardness: Rockwell R120 (Hard)
- For Use Outdoors: No
- Specifications Met: FDA Compliant 21 CFR 176.170, FDA Compliant 21 CFR 177.2470, NSF/ANSI 51, NSF/ANSI 61, UL 94HB
Made of naturally slippery acetal copolymer, these rods and discs are an economical alternative to Delrin® acetal resin. They offer similar wear resistance and are equally resistant to expanding when exposed to heat and moisture. They can be machined to close tolerances and are often used to make precision gears, bushing, bearings, and rollers.
Easy-to-Machine Wear-Resistant
Cast Nylon Rods and Discs
- Color: Off-White
- Temperature Range: -20° to 200° F
- Tensile Strength: 10,000 psi (Good)
- Impact Strength: 1.5 ft.-lbs./in. (Poor)
- Hardness: Rockwell R110-R115 (Hard)
- For Use Outdoors: No
- Specifications Met: ASTM D5989, UL 94HB, Made of FDA Listed Material
Because these cast nylon 6 rods and discs are easier to machine than standard nylon 6/6, they’re often made into pulleys, screws, bushings, and bearings. They’re also better electrical insulators. They have a wear-resistant, slippery surface that reduces friction. This material is comparable to Nylatron and Nycast.
Slippery UHMW Polyethylene Rods and Discs
- Color: White
- Temperature Range: -40° to 180° F
- Tensile Strength: 4,350-5,800 psi (Poor)
- Impact Strength: 16.8 ft.-lbs./in. (Excellent)
- Hardness: Durometer 65D-67D (Medium)
- For Use Outdoors: No
- Specifications Met: UL 94HB, Made of FDA Listed Material
Offering a low-friction surface that prevents sticking and binding, these rods and discs are often machined into bushings and bearings. UHMW is impact and wear resistant to handle the scuffs, scrapes, and strikes that other plastics can’t.
Flexible Polyethylene (LDPE) Rods and Discs
- Color: White
- Maximum Temperature: 155° F
- Tensile Strength: 1,400-3,190 psi (Poor)
- Impact Strength: No Break (Excellent)
- Hardness: Durometer 41D-46D (Medium Soft)
- For Use Outdoors: No
- Specifications Met: FDA Compliant 21 CFR 177.1520
Offering excellent impact resistance, these soft and flexible LDPE rods and discs are easy to machine. They are more formable than HDPE. Use them to create parts for tanks and laboratory containers.