Engineering reference
Built to a spec, not a guess.
Every dimension below describes the hardware only — housing, mechanism, and interface. NexusPens does not sell, formulate, or make claims about anything that goes inside a cartridge, and nothing here should be read as dosing guidance.
01
Interface & compatibility
- Needle interface
- Universal screw-thread, compatible with standard commercial pen needles
- Needle gauge range
- 29G – 34G
- Needle length range
- 4mm – 12.7mm
- Cartridge format
- Standard 3mL glass cartridge, universal bore diameter
02
Mechanical dial
- Dial mechanism
- Spring-loaded rotary dial, mechanical click-stop
- Dial resolution
- 0.5-unit and 1-unit click increments (hardware capability only — not a dosing recommendation)
- Dial reset
- Zero-return after full plunger travel
- Actuation force
- Rated ≤ 8N at full extension
03
Materials & build
- Housing
- Anodized 6061 aluminum (NX-1 Steel: brushed 304 stainless)
- Internal mechanism
- Stainless steel spring, glass-filled polymer carrier
- Seals
- Silicone O-ring, autoclavable
- Caps & tips
- Medical-grade polycarbonate, autoclavable
04
Durability
- Cycle life
- Rated 500+ cartridge change cycles
- Drop rating
- 1.2m onto concrete, housing intact
- Operating temp
- 5°C – 40°C
- Storage temp
- -10°C – 50°C, unloaded
05
Reference standards
- Design reference
- Engineered with reference to ISO 11608 pen-injector conventions (dimensional and interface conventions only — not a certification claim)
- Needle interface standard
- Compatible with the universal luer-style pen-needle thread used across the commercial pen-injector market