Type of screw head / screwdriver

.Type of screw head and screwdriver (from image image.png)

The image.png image represents the contours of different "Screwdriver Drives, which affect the torque and choice of the correct tool:

General Standards Group:

Slotted (Flathead): Single Grooved Flathead, Simple, Early Standard, Used in General Works, but Slippery Easy to Slip if High Torque is Used

Phillips: Cross-pointed head, designed to let the screwdriver fall off on its own (Cam-out) when torque is due to prevent sweet threads.

Pozidriv / Supadriv: Continue development from Phillips bifurcation by adding small ridges between the bifurcations, allowing tighter gelas, reducing slippage, very popular in Europe.

JIS (Japanese Industrial Standard): The Japanese standard bifurcation head looks like Phillips, but the groove is shallower and sharper square, making it tighter, not easy to slip. (The common Phillips screwdriver should not be screwed because it will swipe the head)

Frearson: Phillips-like, but the central groove is more pointed and orthogonal; popular in woodworking and vintage tools.

High Torque Focused Group (High Torque):

Torx: 6-Prong Star Head. Transmits very high torque without the screwdriver slipping off.

Hex (Allen): Inner hexagon head, popularly used in knockdown furniture, machinery and bicycles.

Robertson: Square head. Good torque gain. Easy to center. Very popular in Canada and woodworking.

Bristol / Tri-Groove: Specialized grooved head, often used in industrial and automotive applications requiring high torque.

Anti-unpacking / Modification Group (Tamper-Resistant / Security):

Security Torx / Security Hex / Security Pozidriv: Like the regular version, but with a "center embroidery core," only requires a dedicated tool with a hole in the middle to be screwed.

Tri-Wing: 3-Prong Head, popularly used in electronics and appliances (e.g. game consoles)

Spanner: 2-hole type head (cat eye) totally anti-unpacking, usually found in electrical meters or public equipment.

Clutch: Hourglass-shaped head, anti-tamper, used in some automotive applications.

Pentalobe: 5-pointed star head, usually found on Apple devices (such as the iPhone, MacBook)

One-Way: Designed to be "easily screwed in, but not screwed out" without special tools for permanent safety.

2.Type of bolt, nut and release threaded screw (from image _ 2.png)

Image _ 2.png is a hand-drawn guide that classifies mechanical bonding parts into groups as follows:

🔩 Bolts & Cap Screws (Cap Head Bolts & Screws)

Male bolts for securing workpieces, often coupled with nats (female), hardness grades are specified on the head (e.g., A307, Grade 5, Grade 8)

Hex Bolt / Tap Bolt: Standard Hex Head Bolt

Carriage Bolt / Step Bolt / Elevator Bolt: Round head bolts. The side under the head will have square shoulders to lock it from rotating along when screwing. Popular for use in woodworking or structure.

Flange Bolt: Built-in Ring Hex Head, Helps Diffuse Pressure

Structural Bolt: High Hardness Bolt for Steel Structural Works

🔩 Socket Products (Hole Head Screw Group)

Screw based on L wrench (Hex key) screwing. It is neat and high torque resistant.

Socket Cap Screw: Sunken Cylindrical Head

Button Socket: Round Head, Smooth Finish

Flat Socket: Taper Head (Cone Shape) for Inlay Screw Always Sunken Face Work

🔩 Set Screws (Stage Setting Screws / Worm Screws)

Screws without heads, used to screw sinks into the workpiece to lock the position (e.g., lock the flywheel to the motor core), with the screw ends having several variations according to use, such as Flat Point (smooth end), Cup Point (tight hold cup end), or Cone Point (pointed end).

🪛 Machine Screws (Mechanical Work Screws)

Small screws are often screwed into holes that have been threaded. There are a variety of head shapes, such as Flat Head (smooth sunken head), Pan Head (round pan head), or Truss Head (wide umbrella head).

⭕ Washers (secondary ring)

Use a secondary between the bolt / nut and the workpiece to dissipate or prevent decomposition.

USS / SAE Flat: Common Smooth Front E-Patch Ring

Fender: Extra Wide Front Ring For Tasks that Need to Diffuse Very Strong (e.g. Plastic or Thin Wood Works)

Split Lock / Internal & External Tooth: Spring Ring and Jak Ring. It has threaded lock function, preventing disintegration from tremors.

Nuts (Female Threaded Keyboard / Nut)

Hex Nut / Heavy Hex: Standard Hex Female

Nylock Nut: A female with a nylon ring inside. It helps to loosen from tremors very well.

Wing Nut (Fish Tail Nut): Designed to be easily screwed in-out without tools.

T-Nut / Acorn Nut: Specialized Nuts such as T-Nut for inlay in wood texture, or Acorn Nut (Cap Head) for aesthetics and anti-spiral sharpness.

🪵 Threaded Inserts (Inlaid Spiral)

Metal threaded casing for inlay into a softer material (such as wood or plastic) to create a strong metal thread, allowing screws to be screwed in and out often without the original material texture being damaged.