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Nuts

Shop from a wide variety of nuts, designed for industrial, construction & general purpose applications. Our nuts are offered in numerous materials to fit all your job specifications.

Interested in learning more technical information about nuts? Please check out our Fastener Technical Data Center here. In our Fastener Technical Data Center, you will find a centralized location of essential technical data about a wide variety of aspects all relating to nuts & other common fasteners.

   

Featured

   

Common Nut Types

Nut Visual / Name

Nut Description

Finish Hex Nut

Grade 2

A six-sided internally threaded fastener made from low carbon steel. Finished hex nuts are a versatile and widely used nut design. Grade 2 nuts are for use with any low carbon bolt or screw that is not heat-treated, with a specified minimum tensile strength of 74,000 psi or less.

  • Material- low carbon steel which conforms to the following chemical composition requirements-- Carbon: 0.47% maximum; Phosphorus: 0.12% maximum; Sulfur: 0.23% maximum.
  • Hardness- Rockwell B68 - C32
  • Proof Load- Coarse thread: 90,000 psi. / Fine thread: 80,000 psi.

Hot Dip Galvanized Steel

A six-sided internally threaded fastener made from low carbon steel with a galvanic zinc coating. Use with low carbon bolts and screws that are subjected to moisture, salt and other such corrosive conditions with a specified minimum tensile strength of 74,000 psi or less.

  • Material- low carbon steel which conforms to the following chemical composition requirements-- Carbon: 0.47% maximum; Phosphorus: 0.12% maximum; Sulfur: 0.23% maximum.
  • Hardness- Rockwell B68 - C32
  • Proof Load- Coarse thread: 68,000 psi. / Fine thread: 60,000 psi.

304 & 316 Stainless Steel

Six-sided internally threaded fasteners made from austenitic alloys. Use with stainless steel bolts and screws with a specified minimum tensile strength equal to or less than the specified proof stress of the mating nut.

  • Type 304- the most common grade: (18% chromium, 8% nickel) stainless steel.
  • Type 316- chromium-nickel stainless steel, contains 2 to 3 % molybdenum. The molybdenum content increases corrosion resistance, enhances resistance to pitting and augments strength at high temperatures.
  • Material- 18-8 (18% chromium, 8% nickel): manufactured from one of the following austenitic alloys: 303, 303Se, 304, XM7
  • 316: manufactured from 316 stainless steel, an austenitic alloy with molybdenum content (2-3%) and a higher nickel content (10-14%) than 18.8
  • Hardness- 1/4 through 5/8": Rockwell B95 - C32; 3/4 through 1": Rockwell B80 - C32
  • Proof Load- Coarse thread: 1/4 through 5/8": 100,000 psi. / Fine thread: 85,000 psi.
Hex Machine Nut

A six-sided internally threaded fastener with flat tops and chamfered corners. Threads shall be Unified Standard, Class 2B. Designed to be used specifically with machine screws. A small pattern machine screw nut is available, similar in design to standard hex machine screw nuts but with smaller widths across the flats and across the corners. Stainless machine screw nuts are used with stainless machine screws where parts are subject to corrosive conditions.

Square Machine Nut

A four-sided, internally threaded fastener, tops and bottoms flat, without chamfer. Threads shall be Unified coarse thread, Class 2B. Offers a greater bearing surface for wrenching.

Regular Square Nut

A four-sided, low carbon steel, internally threaded fastener with a flat bottom side and a chamfered, washer-crowned top, designed to be used with square head bolts. A heavy pattern, with a plain finish is available for use with A307 Grade A or Grade B bolts.

Finished Hex Jam Nut

A six-sided internally threaded fastener which is only 2/3 the thickness of a full form nut but has the same dimensions across the flats and corners. It can be threaded on a bolt and run tight against a standard hex nut which will lock the nut in place and prevent it from backing off. Jam nuts are also used for leveling or when a low profile is required. Available in low carbon steel, Grade 5 medium carbon steel, Grade 8 high alloy steel and 304 stainless steel.

Slotted Hex Nut

Hex nut with opposite slots that are cut into the top of the nut through the centers of the flats. The slots are for the insertion of a cotter pin to secure the nut when used with a drilled shank fastener. Finished pattern slotted uts are made from a low carbon steel and are zinc plated. Heavy hex pattern can withstand a slightly higher proof load and comes in a plain finish.

Heavy Hex Nut

A six-sided internally threaded fastener which is thicker and wider across the flats than a same-sized finished hex nut. Nuts measuring 7/16” and smaller are double-chamfered. Larger sizes are either double chamfered or chamfered on top with a washer base.

Grade A nuts are used with low carbon steel heavy hex bolts. Grade 5 are used with medium carbon cap screws and bolts. Grade C nuts are recommended to be used with A325 structural bolts. Grade 2H nuts are recommended for use in high pressure and high temperature service. Grade DH are recommended for use with A490, Type 1 structural bolts and Grade DH3 for A490, Type 3 structural bolts. Use 18.8 stainless steel heavy hex nuts for corrosion resistance. Hot Dip Galvanizing available on Grade A, 2H, and A563DH heavy hex nuts.

  • Hardness
    • Grade 5 - Rockwell C32 max
    • Grade A - Rockwell B68-C32
    • Grade C - Rockwell B78-C38
    • A194 Grade 2H - Rockwell C24-C38
    • A563 Grade DH & DH3 - Rockwell C24-C38
    • 18.8 Stainless Steel – ¼” through 5/8”, Rockwell B95-C32, ¾” through 1”, Rockwell B80-C32
  • Proof Load
    • Grade 5 – ¼” through 1” diameter course thread- 133,000 psi., fine thread 120,000 psi.
    • Grade A – course thread – 100,000 psi., fine thread 90,000 psi.
    • Grade C – 144,000 psi.
    • A194 Grade 2H – 150,000 psi.
    • A563 Grade DH & DH3 – 175,000 psi.
    • 18.8 Stainless Steel – ¼” through 5/8”, 100,000 psi., ¾” through 1”, 85,000 psi.
Hex Flexloc Nut

An all-metal, one-piece, hex-shaped all metal prevailing torque lock nut with a round collar at its back end. The collar is segmented with opposite slots cut into it above each corner of the nut. When a screw or bolt reaches the collar, the slotted portion expands which created the prevailing torque locking action. Higher temperature use than nylon insert locknuts. The nuts are impact, shock and vibration resistant. Flexlock® Lock Nuts are available in Light Hex Full and Thin Height, and Heavy Hex Full and Thin Height. Light Hex are available in 18.8 stainless steel and steel cadmium and wax finishes, Heavy Hex is available in a steel cadmium and wax finish.

Grade 5 Finished Hex Nut

Grade 5 nuts achieve their strength through cold forming. The proof load of the nut should be greater than the minimum tensile strength of the bolt to ensure that if overloaded, the bolt breaks rather than the nut threads shearing or stripping. Grade 5 finished hex nuts are designed to be used with Grade 5 hex cap screws. Grade 5 finished hex nuts typically have a clear trivalent chromate finish. The marking requirements are covered in SAE J995, Grade 5 are marked with two circumferential lines located 120° apart.

  • Material- manufactured from steel with a maximum carbon content of 0.55%, a minimum manganese content of 0.30%, and a maximum sulfur content of 0.15%. AISI 1008-1026 or equivalent
  • Hardness- Rockwell C32 max
  • Proof Load- Coarse Thread: 1/4" through 1" 120,000 psi. / Fine Thread: 109,000 psi / Coarse Thread: 1-1/8" - 1-1/2" 105,000 psi. / Fine Thread: 94,000 psi
Grade 8 Finished Hex Nut

Grade 8 nuts are heat treated to provide a greater level of strength. The proof load of the nut should be greater than the minimum tensile strength of the bolt to ensure that if overloaded, the bolt breaks rather than the nut threads shearing or stripping. Grade 8 nuts are designed to be used with Grade 8 cap screws. A stronger nut can nearly always be used with a weaker bolt, a Grade 8 nut is acceptable for use on a Grade 5 cap screw. Grade 8 nuts typically have a yellow chromate finish. The marking requirements are covered in SAE J995, The marking requirements are covered in SAE J995, Grade 8 nuts are marked with two circumferential lines located 60° apart.

  • Material- manufactured from steel with a maximum carbon content of 0.55%, a minimum manganese content of 0.30%, and a maximum sulfur content of 0.05%. AISI 1021-1045 or equivalent steel.
  • Hardness- 1/4" through 5/8": Rockwell C24-C32 / 3/4" through 1": Rockwell C26-C34 / Over 1" - 1-1/2": Rockwell C26-C36
  • Proof Load- 1/4" through 1-1/2" 150,000 psi
Hex Castle Nut

Similar to a slotted nut with the following difference: the slots are cut into a cylindrical portion that is equal in length to the slot depth and slightly smaller in diameter than the hex width. The slots are for the insertion of a cotter pin to secure the nut when used with a drilled shank fastener. Available in low carbon steel and Grade 5 SAE 1010-1022 steel.

Serrated Hex Flange Nut

A hex flange nut with serration is a nut that is formed with an enlarged circular base that flares out from the bottom of the nut. When the nut is torqued into place, the bearing surface of the serrated base displaces the material of the mating surface. This forms a locking effect which resists vibrational loosening. The flanged surface will span an oversized hole and provide a more uniform bearing- stress to clamp-force ratio than a finished hex nut and will not gall screw threads.

A large flange nut is available with a base that is 6 to 25% wider than the base of a standard serrated flange nut. Carbon steel nuts are case-hardened to Rockwell HR15N 78-90. Also available in Grade 5 and Grade 8 steel and 18.8 stainless steel.

Hex Flange Nut

Hex nut with an enlarged circular base flaring out from the bottom of the nut. The bearing surface of the flange is smooth with no serrations. Used to span oversized or irregular holes.

Nylon Insert Lock Nut

A hex nut with two components, a hex nut and a nylon filled collar at its back end. When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the screw when it is subject to vibration. The nylon insert provides reusability. When removed, the nylon relaxes and begins to return to its original shape providing continued use of the locking feature. Designed for applications with temperatures of up to 250°F.

Nylon Insert Locknuts are available in different series/types and materials, including: NE (Light Hex, Standard Height), NTE (Light Hex, Thin Height), NTU (Heavy Hex, Thin Height), NU (Heavy Hex, Full Height), NM (Machine Screw Pattern, Standard Height), and NTM (Machine Screw Pattern/Thin (Jam) Height). Available in steel, stainless steel, brass and aluminum.

K-Lock Nut (Keps)

A hex nut pre-assembled with a free spinning external tooth lock washer. The locking action is achieved when the nut is tightened against a bearing surface as the teeth of the lock washer dig into it. The nuts are manufactured from AISI 1008-1020 or equivalent steel; and the washers from 1050-03 or equivalent steel. Also available in 18.8 stainless steel.

Grade C Top Lock Nuts

All Metal Hex Lock Nuts are designed to increase the resistance to rotation by developing a “prevailing torque” action between the bolt threads and the nut threads. This prevailing torque action is developed by “crimping” the nut to create added friction between the threads of the nut and the bolt. All metal lock nuts feature a crowned top that is crimped to create the locking feature. This crowned top design is called a “stover” style lock nut. The crimp provides a locking ability and resistance to loosening in high vibration applications.

All metal lock nuts are made to the material properties and strength requirements as per the standard IFI 100/107 for Grade C which is designed to be used on fasteners up to a Grade 8 strength level.

Rod Coupling Nuts

Rod coupling nuts are used to connect two pieces of threaded rod. Available in low carbon steel, plain and hot dip galvanized finish, grade 5 and 18.8 stainless steel. Hot-dip galvanizing generally adds 2.5 to 5 mils of thickness to the threaded portion of a fastener, so galvanized couplers are tapped oversize to accommodate the added thickness to the corrosion resistant coating on the bolts.

Two-Way Reversible Lock Nuts

A hex nut with two or three round or rectangular indentations, compressed on to the flat sides of the nut equal distances from each other. The compressions create slightly distorted center threads resulting in a controlled locking action when the threads of a mating part become engaged.

Used primarily with machine screws, low carbon steel bolts and 18.8 stainless steel bolts. It allows for automatic assembly ability to be used either top-up, or top-down. It creates a locking action even without being fully threaded onto its mating screw.

3 Prong Wood Tee Nuts

3-prong tee nuts are used to fasten a metal piece to a component that is made of wood, plastic, or particleboard, or for anchoring wood components to each other. 3 Prong T-Nuts are used mostly in hard materials to minimize splitting caused by prongs. Available in steel zinc and steel black zinc plated.

Acorn Cap Nuts

Low crown steel cap nuts are usually manufactured in two pieces, a hex nut and an acorn-shaped top, with a zinc die cast to form the finished nut. Stainless steel cap nuts are similar in design to the steel nut but made from 304L or an equivalent stainless and can be a one or two-piece style. Available in the aforementioned stainless steel and steel with a nickel plating or black zinc finish and black oxide. Cap nuts are used for decorative purposes or as covers for projecting threads.

Cold Forged Wing Nuts

A nut with wings which allow the part to be manually turned. Manufactured from carbon steel that is adaptable to the cold-forging process. Available in a zinc plated finish, black oxide and nickel and 18.8 stainless steel.

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