# Elements of Connection

> Mechanical connection parts: T8 blockers, ball joints, servo linkage connectors for motion systems

- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Category page: https://sigmanortec.ro/en/elements-of-connection
- Category: Mechanical components > Elements of Connection
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:32 (Europe/Bucharest)

## Products (3)

### Stainless steel T8 lock nut, 8 mm, with M4 hex socket screw
- Page: https://sigmanortec.ro/en/t8-blocker
- Details: https://sigmanortec.ro/en/llms/p/50.md
- Price: 7.89 RON
- Availability: In stock; 1-2 zile
- Reference: 33115 · EAN: 5942589562508

Provides firm fixation of an 8 mm guide shaft, preventing slipping and maintaining the position of components in mechanical assemblies. It has an 8 mm internal diameter for precise fit, quick assembly, robust construction for industrial use, supports stable and reliable operation over time.
The T8 shaft collar is a stainless steel locking ring, with an inner diameter of 8 mm, intended for smooth guide shafts and T8 rods with the same diameter. Its role is to stop the axial movement of a component mounted on a shaft, functioning as a stop, spacer, or support surface for linear bearings, gears, rollers, or other moving parts.

### Ball joint, M4, external thread, SA4T
- Page: https://sigmanortec.ro/en/ball-joint-m4-external-thread-sa4t
- Details: https://sigmanortec.ro/en/llms/p/2069.md
- Price: 8.32 RON
- Availability: Out of stock
- Reference: 9899 · EAN: 5940766078149
- Specifications: Model: SA4T

Ball joint SA4T with external M4 right-hand thread, made of steel. Often used for arms and guide rods in Delta 3D printers, providing precise movement and angle compensation. Total length 36mm, thread length 21mm, ball inner diameter 4mm.

### Linkage stopper - 3mm (OD7mm)
- Page: https://sigmanortec.ro/en/linkage-stopper-3mm-od7mm
- Details: https://sigmanortec.ro/en/llms/p/2420.md
- Price: 9.85 RON
- Availability: In stock; 1-2 zile
- Reference: 88223 · EAN: 5949419792753
- Specifications: Rod diameter: 3 mm

Linkage stopper for aero and hydro models, used to create an adjustable connection between the servo arm and the push rod. Made of metal alloy, push rod diameter 3.0 mm, outer diameter (OD) 7 mm. Secured with an M3 grub screw and lock nut, allowing fine adjustment of push rod length without special tools.