Parker Hydraulic Straight Threaded Adapter 6-4HMK4S, Connector A G 1/4 Male, Connector B G 3/8 Male

  • RS Stock No. 807-570
  • Mfr. Part No. 6-4HMK4S
  • Brand Parker
Technical Reference
Legislation and Compliance
RoHS Status: Not Applicable
Product Details


A range of equal and unequal male BSP parallel thread adaptors.
Parkers K series adapters are manufactured to meet BS5200 standards and designed to seal with BSP
Hose swivel connectors. Parkers K4 adapter series can be used with Parker D9/92, B1, B2 and B4 adapters. Straight fittings can also be used an adaptor with ISO 1179-1 / DIN 3852 ports by using a bonded seal.

Features and Benefits

Visible bite of progressive ring helps prevent blow-off
Excellent sealing capacity when used in various applications including vacuum and hydraulic systems
Stress evenly distributed throughout out minimising concentration at the bite point
Compact overall dimensions make EO fittings ideal or confined spaces


For adaptors of unequal sizes then the lower pressure rating is applicable.




  • Hydraulic systems can work at high pressures, and fittings and adaptors can be subjected to extreme loadings such as vibration and uncontrolled pressure peaks. When choosing fittings or adaptors careful attention should be given to the technical specifications.
Attribute Value
Connector A G 1/4 Male
Connector B G 3/8 Male
Material Steel
Finish Yellow Chromated, Zinc Plated
Connector A - Thread Size 1/4in
Connector A - Thread Standard G
Connector A - Gender Male
Connector B - Thread Size 3/8in
Connector B - Gender Male
Connector B - Thread Standard G
Maximum Operating Pressure 450 bar
Maximum Operating Temperature +120°C
Minimum Operating Temperature -40°C
170 In stock for FREE next working day delivery
Price Each (In a Pack of 2)
£ 2.325
(exc. VAT)
£ 2.79
(inc. VAT)
Per unit
Per Pack*
2 - 8
10 - 18
20 - 48
50 +
*price indicative
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