What is a bolt with a smooth head called?

What is a bolt with a smooth head called?

Carriage Bolt A bolt with a smooth rounded head. The vast majority of carriage bolts have a square neck. This is a small square section under the head that prevents spinning during assembly. Carriage bolts are primarily used in wood.

What is a smooth screw called?

shank
The head of a screw is the portion that contains the drive and is considered the top of the screw. Most wood screws are Flat heads. Other common heads: Oval, Round, Hex, Modified Truss, Trim Flat. The shank is the smooth portion of a wood screw which has no threads and begins immediately beneath the head.

What are the different types of machine screws?

What are Machine Screws?

• Stainless steel machine screws.
• Brass machine screws.
• Plated machine screws.
• Slotted or flat-head machine screws.
• Phillips head machine screws.
• Torx head and hex head machine screws.
• Fillister or cheese-head machine screws.
• Pan head machine screws.

What is the difference between a cap screw and a machine screw?

A socket cap screws are machine screws with a cylindrical barrel shaped head containing a hexagonal socket. The head has a smaller diameter than most other machine screw heads, typically just 1.5 times the nominal thread diameter.

Why do some screws have shanks?

Some screws have a partially threaded shank to protect them against loosening. When driven into an object or surface, they’ll stop automatically after reaching the end of the threading. And like fully threaded screws, they can be used either with or without nuts and washers.

What are the 6 common types of screw heads?

6 Common Types of Screw Drives

• #1) Phillips-Head. Arguably, the most common type of screw drive is Phillips head.
• #2) Flat-Head. Also known as a slot drive, a flat-head screw lives up to its namesake by supporting the use of a flat-head screwdriver.
• #3) Hex.
• #4) Torx.
• #5) Double Hex.
• #6) Robertson.

What are TX screws?

A Torx screw is a type of screw characterized by a six-lobed, star-patterned screw drive. Torx drive is a trademark commonly referred to as star drive or, simply, a six-lobe. It’s often abbreviated to TX or 6lobe. The ISO name is hexalobular.

Why are there different types of machine screw heads?

The reason for the different styles is cost and torque. Phillips screws are self-centering, making powered screwdrivers possible. They’re somewhat more expensive to produce than slotted-head. They tend to ‘cam-out’ easily under torque, making it hard to apply much torque.

What does a Panhead screw look like?

Pan head screws take their name from the appearance of their head, which looks similar to an upside-down frying pan. The socket is typically a slot, particularly for wood and self-tapping screws. Hexagon sockets are also common for machine screws.

Which is the best head for socket driven screws?

Button Head – Rounded head most often used in socket driven screws. Becoming more common with Torx / Six-lobe drives as well. Fillister Head – Smaller diameter and higher profile than round or pan heads allows for deeper slot. Flat Head (82 degrees) – Standard countersunk flat head screw.

What kind of screws have a 90 degree head?

Flat Head (Metric) – Metric flat heads screws come standard with a 90 degree head angle. Hex Head – Common in bolts, hex heads allow for greater torque and are driven with the drivers force against the outside of the head, unlike most drives, which are internally driven.

What are the different types of screw heads?

Binder / Binder Undercut – Often used for electrical applications. The undercut area beneath the head allows space for wire connections. Bugle Head – Countersunk style primarily used in drywall and wood decking. Button Head – Rounded head most often used in socket driven screws.

Can a flat bottomed screw be substituted for a round head?

Used in many applications when a flat bottomed screw is required. Can be successfully substituted for many similar head styles. Round Head – Becoming less common, but offers an appearance alternative from other rounded head screws. Round Washer Head – Creates larger bearing surface in situations where rounded head is preferred.