Overview
This article provides the specifications for industrial quick-disconnect air fittings and couplers used on BestPack machines for the air supply line infeed connection. Each machine model uses specific fitting sizes and McMaster part numbers to ensure proper air supply compatibility. Use this guide when ordering replacement fittings or when setting up air supply connections.
Step 1 — ELVS Machine Air Fitting Specifications
The ELVS (carton erector) machine uses the following air fittings for the infeed air supply line:
Machine-Side Plug (Male End):
- Type: Industrial Quick-Disconnect Hose Coupling for Air
- Size: 3/8 inch coupling size
- Material: Zinc-Plated Steel
- Thread: 3/8 NPTF Male End
- McMaster P/N:
6534K72
Supply-Side Socket (Female End):
- Type: Industrial Quick-Disconnect Hose Socket Coupling for Air
- Size: 3/8 inch coupling size
- Material: Zinc-Plated Steel with Sleeve-Lock
- Thread: 1/2 NPTF Female
- McMaster P/N:
6536K33
Step 2 — AS + RS Machine and CSS Air Fitting Specifications
The AS unit, RS unit, and CSS (Allen Bradley 4-axis servo) machines use the following air fittings for the infeed air supply line:
Machine-Side Plug (Male End):
- Type: Industrial Quick-Disconnect Hose Coupling for Air
- Size: 1/4 inch coupling size
- Material: Zinc-Plated Steel
- Thread: 1/4 NPTF Male End
- McMaster P/N:
6534K46
Supply-Side Socket (Female End):
- Type: Industrial Quick-Disconnect Hose Socket Coupling for Air
- Size: 1/4 inch coupling size
- Material: Zinc-Plated Steel with Sleeve-Lock
- Thread: 1/4 NPTF Female
- McMaster P/N:
6536K55
Step 3 — CSX, CSEG, CSEGA, CSF, and CSD Machine Air Fitting Specifications
The CSX, CSEG (Egg Machine), CSEGA, CSF (ClearPath Servo with Folding), and CSD (ClearPath Servo with Dual) models use the following air fittings for the infeed air supply line:
Machine-Side Plug (Male End):
- Type: Industrial Quick-Disconnect Hose Coupling for Air
- Size: 1/2 inch coupling size
- Material: Zinc-Plated Steel
- Thread: 1/2 NPTF Male End
- McMaster P/N:
6534K43
Supply-Side Socket (Female End):
- Type: Industrial Quick-Disconnect Hose Socket Coupling for Air
- Size: 1/2 inch coupling size
- Material: Zinc-Plated Steel with Sleeve-Lock
- Thread: 3/4 NPTF Female
- McMaster P/N:
6536K52
Common Mistakes
| Mistake | Result | Fix |
|---|---|---|
| Using wrong coupling size (mixing sizes between machine models) | Air fittings will not mate or connect properly; air supply line will leak or not seat | Verify machine model and use the correct McMaster part number for that specific machine |
| Confusing male (plug) and female (socket) ends | Cannot connect air supply; connection attempt will fail | Machine has the male end (plug); supply line has the female end (socket). Order accordingly |
Ordering 6536K33 (1/2 NPTF female) for ELVS instead of checking thread size |
Coupling will have mismatched thread size; cannot seal air connection properly | ELVS uses 1/2 NPTF female socket (6536K33). Do not substitute with other thread sizes |
| Using non-zinc-plated or non-industrial-grade couplings | Corrosion, faster wear, potential air leaks over time | Always use zinc-plated steel industrial quick-disconnect couplings specified in this guide |
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