MK Series

Midlock Glands
MK Series Midlock Glands
  • Metal to Metal Seal
  • Seals 1 Element
  • For Gas or Liquid
  • Stainless Steel Throughout
  • Easy To Use – Slide Assembled Fitting Over Tube or Probe and Simply Tighten at Desired Location
  • Single Ferrule Is Self-Aligning (No Lost Pieces)
  • May Be Opened and Resealed
  • Temperature Range From Cryogenic to +1600°F (+870°C)
  • Pressure*: Vacuum to 10,000 PSI (690 bar)
  • Suitable For High Vibration Applications
REUSABLE CAPABILITY: All metal MIDLOCK fittings may be opened and resealed at fixed immersion depth.
  • Freely adjustable unit first tightened.
  • Stainless Steel.
  • High pressure range 10,000 psi.
  • Single Stainless Steel ferrule is deformed against tube and makes a seal without cutting sheath surface.
Product Description:
Pressure or vacuum sealing of thermocouple and RTD probes, tube shielded thermistor probes, laboratory test lines, etc. Use where joint must be opened and resealed in same setting.
Specifications Table:
Catalog Number Tube or Probe Diameter*** Thread NPT Length Hex Size TORQUE** (Ft-Lbs)
MK-062-A .062 1/8″ 1-3/16″ 1/2″ 10
MK-125-A .125 1/8″ 1-3/16″ 1/2″ 12
MK-187-A .187 1/8″ 1-3/16″ 1/2″ 18
MK-250-A .250 1/4″ 1-5/8″ 5/8″ 30
MK-375-A .375 1/2″ 2″ 1″ 50
Grey Arrow
Length A
Type A has mounting thread only
  • All pressure and vacuum ratings determined at 68°F.
  • Other size NPT, MS 33656 Style E mounting thread also available. Consult factory.
  • Pressure rating guide values are for glands with elements restrained by the compressed ferrule.
  • ** All pressure and torque ratings determined at 68°F with solid stainless steel rod used as the element.
  • ***Tolerance of tube or probe diameters, ±.005. Deviation from the nominal may effect pressure ratings.
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