Bolts

Hex bolts, carriage bolts, lag bolts, and structural fasteners.

Hex Bolt

The most common bolt type with a hexagonal head. Used with nuts for through-bolting or in tapped holes.

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Carriage Bolt

Bolts with a domed head and square shoulder that prevents spinning during tightening. No exposed drive.

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Lag Bolt

Heavy-duty wood screws with hex heads. Used for high-strength wood connections without through-bolting.

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Eye Bolt

Bolts with a looped head for attaching ropes, cables, or chains. Available in forged and bent-rod styles.

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U-Bolt

U-shaped bolts with threads on both ends for clamping pipes, tubes, or round objects to surfaces.

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J-Bolt

J-shaped anchor bolts embedded in concrete for securing plates and equipment. Hook end provides anchorage.

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L-Bolt

L-shaped anchor bolts for embedding in concrete. Bent end provides pull-out resistance in poured concrete.

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Flange Bolt

Hex bolts with integrated circular flange that acts as a built-in washer. Distributes load and reduces assembly parts.

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Stud Bolt

Headless threaded rods with threads on both ends. Used with nuts on both ends for flange connections.

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Elevator Bolt

Flat-head bolts with square necks for conveyor and elevator bucket attachment. Low-profile design minimizes interference.

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Shoulder Bolt

Precision bolts with a smooth, unthreaded shoulder between head and threads. Used as pivot points and guides.

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Sex Bolt

Two-piece fastener with male and female components that mate together through a panel. Clean finish on both sides.

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Plow Bolt

Heavy-duty countersunk bolts with square necks for agricultural equipment. Flush-mounting in wear plates.

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Hanger Bolt

Headless bolt with wood screw threads on one end and machine threads on the other. Connects wood to metal.

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Structural Bolt

High-strength bolts for structural steel connections. Engineered for controlled tension in slip-critical joints.

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T-Bolt

T-shaped bolts designed to slide into T-slots on machine tables, fixtures, and extrusions. Head rotates to lock.

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Toggle Bolt

Hollow wall fasteners with spring-loaded wings that spread behind drywall. High holding power in hollow walls.

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Frequently Asked Questions

What is the difference between a bolt and a screw?
By general convention, a bolt passes through an unthreaded hole and is secured with a nut on the opposite side. A screw threads directly into a tapped hole or material. However, usage varies by industry — ASME defines the distinction based on how the fastener is tightened (by the nut vs by the head).
What do bolt grade markings mean?
Grade markings on bolt heads indicate tensile strength. Grade 2 (no marks) is standard low-carbon steel. Grade 5 (three radial lines) is medium-carbon quenched and tempered steel with 120,000 PSI tensile strength. Grade 8 (six radial lines) is high-strength alloy steel at 150,000 PSI. Metric bolts use a numerical system (e.g., 8.8, 10.9, 12.9).
When should I use a carriage bolt vs a hex bolt?
Carriage bolts have a smooth, dome-shaped head with a square shoulder beneath that locks into the wood to prevent spinning. They are used when a finished appearance is needed or when the bolt head should not be removable with a wrench. Hex bolts are tightened from the head side with a wrench and are used in structural and mechanical applications where higher torque is required.
What is the difference between coarse and fine thread bolts?
Coarse thread (UNC) bolts have fewer threads per inch, are more resistant to cross-threading, and are standard for general-purpose use. Fine thread (UNF) bolts have more threads per inch, providing higher tensile strength and better resistance to vibration loosening. Fine threads are common in automotive and aerospace applications.
How do I measure bolt length?
Bolt length is measured from the bearing surface (underside of the head) to the end of the shank. For hex bolts and most standard bolts, this means the head is not included in the length. Exceptions include countersunk bolts (e.g., flat head), where length is measured from the top of the head since it sits flush with the surface.