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Milton S‑643 female hex coupling is a brass fitting with dual 1/4″ FNPT ports for assembling or repairing airline hoses.
The Milton S‑643 female hex coupling is a precision-manufactured brass hose fitting featuring dual 1/4″ female NPT threaded ends. Designed for assembling new air hoses or servicing existing ones, the milton s-643 female hex coupling ensures leak-free connections and is widely trusted in automotive, industrial, and fleet maintenance environments.
Constructed from solid brass and machined with hexagonal flats for easy wrench installation, this coupling is rated for standard pneumatic pressures (typically up to 300 PSI). Its compact design and accurate threading make it ideal for quick repairs and reliable hose fabrication.
The milton s-643 female hex coupling is sold in retail packaging, including single units or box of 10 packs, offering flexibility for both individual and bulk use scenarios. Its “Made in USA” status reflects Milton’s long-standing reputation for quality in pneumatic accessories.
Dual 1/4″ female NPT ends for flexible hose assembly
Brass construction resists corrosion and maintains strength
Hex coupling body allows easy tightening with standard wrenches
Compact 1/4″ size ideal for light-duty pneumatic hoses
Made in USA by Milton Industries for professional reliability
| Specification | Details |
|---|---|
| Brand | MILTON INDUSTRIES |
| Model / Part Number | S‑643 |
| Connection Type | Female 1/4″ FNPT × 1/4″ FNPT |
| Material | Solid Brass (hex body) |
| Typical PSI Rating | Up to ~300 PSI |
| Package Quantity | Retail single or Box of 10 units |
| Country of Origin | USA |
| Item Weight | ~0.07 lb (~32 g) per unit |
Building or repairing pneumatic air hoses
Replacing damaged fittings on existing hoses
Automotive workshops, compressor kits, or equipment hook-ups
Industrial plants needing reliable brass fittings
Wrap male NPT threads with Teflon tape or apply suitable thread sealant.
Tighten using a wrench on the hex flats—avoid overtightening.
Inspect for leaks under pressure before full operation.
Store in a dry environment to maintain finish and prevent oxidation.
Reliable Milton brand quality, crafted in the USA
Versatile brass construction suitable for standard pneumatic uses
Hex coupling shape simplifies installation or replacement
Compact and effective, ideal for 1/4″ hose systems
Available in singles or bulk packaging, adaptable to various needs
