About Nut Materials

Grade/Class	Features
Grade 2	Made from low-strength steel such as: C1006-C1022, C1215, 12L13, or 12L14.
Grade 2H	Comparable to medium-strength steel.
Grade 5	Made from medium-strength C1008-C1026 steel.
Grade 7	This chromium-molybdenum steel is normally made of AISI 4140 to 4145H alloy steel.
Grade 8	Made from high-strength C1021-C1045 steel.
Grade 8M	Metal is cold worked, non-magnetic.
Grade 9(L9)	Made of high-grade AISI 8640H alloy steel.
Grade 932	Due to addition of lead and tin, it is relatively soft. Nonsparking. Not magnetic.
Grade C	Comparable to medium-strength steel.
Grade DH	Comparable to medium-strength steel.
Class 4	Made of general purpose low-strength steel.
Class 5	Made of general purpose low-strength steel.
Class 5.8	Made of general purpose low-strength steel.
Class 6	Comparable to Grade 2 steel.
Class 8	Comparable to Grade 5 steel.
Class 10	Comparable to Grade 8 steel.
Class 40	The highest strength, hardness, and resistance to wear and heat treat response for an unalloyed gray iron.

Finish/Coating	Features
Plain	Good for general purpose use.
Zinc-Plated and Yellow Zinc Dichromate	Good to excellent rust and weather resistance.
Black	Offers mild rust resistance and some lubrication qualities.
Black Luster-Coated	Offers a durable and decorative finish. Provides corrosion resistance superior to black-finish and zinc-plated finishes.
Cadmium-Plated	Excellent rust and weather resistance. It also contains lubricating properties.
Chrome-Plated	Provides a bright, attractive appearance with good rust resistance.
Nickel-Plated	Fair rust and weather resistance. Often used for decorative applications.
Blue-Coated	Makes these metric items easy to distinguish from inch items.
Ultra-Coated	Also known as armorcoat, this silver-gray polymer coating offers better corrosion resistance than zinc, hot-dipped galvanized, and cadmium platings.
Galvanized	Same strength and properties of zinc-plating, but with a thicker coating for excellent rust, weather, and corrosion resistance.
Dull Brass, Chrome	Often used for decorative applications.
Dark Bronze	Often used for decorative applications.

Material Type	Features
Steel	Made of general purpose low-strength steel.
A286 Super Alloy	An iron-based material containing 26% nickel and 15% chrome. It offers the strength of alloy steel with corrosion resistance similar to 18-8 stainless steel.
17-4 PH Stainless Steel	Combines the high strength of hardened alloy with excellent corrosion resistance that's similar to 18-8 stainless steel.
18-8 Stainless Steel	Excellent corrosion resistance. May be mildly magnetic.
Alloy 20 Stainless Steel	Also known as Carpenter 20, this alloy is the most resistant to stress-corrosion cracking and hot sulfuric acid. It's a high-nickel stainless steel with about four times as much nickel as 18-8 stainless steel. Made of approximately 34% nickel, 20% chromium, and the balance iron. May be slightly magnetic.
302 Stainless Steel	Higher carbon content for slightly higher strength than Type 304 with same corrosion resistance. Cannot be heat treated.
304 Stainless Steel	The most widely used stainless steel. Has good resistance to high temperatures and corrosion.
316 Stainless Steel	Contains molybdenum for better corrosion resistance than 18-8 stainless steel. Resists chemicals, solvents, and pitting. May be mildly magnetic.
410 Stainless Steel	Heat treated, magnetic, and stronger than 316 and 18-8 stainless steel. Use in mildly corrosive environments, such as those with steam and weak acids.
Aluminum	Ideal for outdoor use, it's nonmagnetic and has the strength of mild steel at 1/3 the weight.
Plain Brass and Commercial Brass	Resists rust and mild atmospheric corrosion. It's nonmagnetic with good strength, durability, corrosion resistance, and electrical conductivity. Commercial Brass is 2/3 copper and 1/3 zinc.
Plain Bronze and Silicon Bronze	It's nonmagnetic and more resistant than brass to corrosion caused by salt water, gases, and sewage. Silicon Bronze is made of 95-98% copper, plus silicon for strength.
Hastelloy	This nonmagnetic alloy is suitable for welding and has excellent resistance to pitting, stress-corrosion cracking, and rusting. Resists corrosive chemicals such as chlorine. Made of approximately 55% nickel, 16% chromium, and 15% molybdenum.
Iron	Provide great strength and durability.
Nickel-Copper Alloy 400 (Monel)	Stronger than brass; slightly magnetic; and resistant to heat and corrosion, especially that caused by salt water and caustic solutions. Made of approximately 65% nickel and 30% copper.
Titanium	As strong as steel, but weighs 60% less. Resists rust, salt water, plus many chemicals and acids.
Acetal	Excellent resistance to wear, gasoline, solvents, and other neutral chemicals. It has low moisture absorption.
Ceramic	Highly resistant to corrosive gases, and withstand high temperatures. Won't melt, rust, seize, or become brittle, and are electrically insulating and nonmagnetic.
Fiberglass	Made of a nonconductive, flame-retardant vinyl ester. This material resists many mild acids, solvents, salt water, oils, and gasoline.
Kynar	Offering excellent corrosion and chemical resistance, this tough and durable material is also known as PVDF (polyvinylidene fluoride).
Nylatron	Made from a lubricated nylon.
Nylon 6/6	Nonconductive, plus chemical and solvent resistant (excluding mineral acids). It absorbs environmental moisture, which can affect dimensions and properties.
Polyamide	Lightweight and economical.
Polycarbonate	Tough with high impact strength.
Polyethylene	Made of low-density polyethylene (LDPE). Nonconductive, noncorrosive, and chemical resistant. Withstands a wide range of temperatures.
Polypropylene	One of the most commonly used plastics due to its low cost. Resists solvents. Has excellent insulating properties and good impact resistance and structural rigidity. High fatigue strength and light weight make it ideal for cyclical loading operations.
PTFE	Excellent for electrical applications, this virgin-grade material resists moisture and chemicals.
PVC	Resists moisture, acids, alkalies, salt solutions, and alcohols.