Flange Hexagonal Slot Oil Plug Screw

Cold heading process is one of the new processes for pressure machining of less or no cutting
metal. It is a processing method that utilizes the plastic deformation of metal under the action of
external forces, and with the aid of molds, redistributes and transfers the volume of metal to form
the required parts or blanks. The cold heading process is most suitable for producing standard
fasteners such as bolts, screws, nuts, rivets, and pins.etc

Flange Hexagonal Groove Oil Plug – Overview

A flange hexagonal groove oil plug is a specialized sealing fastener designed for fluid retention in engines, gearboxes, hydraulic systems, and industrial machinery. It combines a hex head for tool engagement, a flange base for secure sealing, and often a groove for an integrated O-ring or gasket.Flange Hexagonal Slot Oil Plug Screw

Key Features & Design Elements

1. Head Design

• Hexagonal (6-sided) head – Allows tightening/loosening with a standard wrench, socket, or Allen key (depending on design).

• Flange base – A widened, flat collar that distributes clamping force, prevents over-tightening, and improves sealing.

• Groove for O-ring/gasket – A machined recess near the threads houses a rubber or silicone O-ring for a leak-proof seal.

2. Thread Type

• Straight threads (BSPP, UNF, Metric) – Often used with sealing washers or O-rings.

• Tapered threads (NPT, BSPT) – Self-sealing when torqued properly.

• Common sizes: M12x1.5, M14x1.5, 1/2″ NPT, 3/4″ BSPP (varies by application).

3. Sealing Mechanism

• Integrated O-ring (most common) – Provides a reusable, pressure-resistant seal.

• Copper/aluminum crush washer – Used in high-torque applications (single-use).

• Metal-to-metal sealing (in flanged designs without a groove).

Comparison to Other Oil Plugs

Flange Hexagonal Slot Oil Plug Screw