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Technical Data Sheet
644-1 ✓ Verified by PartsTable
Zyxel · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

TEST STAND,HYDRAULIC SYSTEM COMP. Key specifications include material: COPPER ALLOY OVERALL, nut_style: HEXAGON, nut_height: 0.093 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNEF, special_features: USED ON BANANA JACKS MODELS 1581, 2854, 4900, 2269, 5233, 4601, 4005, 4069 AND 4163. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-144-3325, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
644-1
NSN: 5330-00-144-3325
FSC: 5330
CAGE: 78640 — MITSUBISHI CATERPILLAR FORKLIFT AMERICA, INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleHEXAGON
nut_height0.093 INCHES NOMINAL IN
thread_class2B
thread_seriesUNEF
special_featuresUSED ON BANANA JACKS MODELS 1581, 2854, 4900, 2269, 5233, 4601, 4005, 4069 AND 4163
thread_directionRIGHT-HAND
width_across_flats0.375 INCHES NOMINAL IN
nominal_thread_size0.250 INCHES IN
thread_quantity_per_inch32
part_name_assigned_by_controlling_agencyNUT, HEX
NSN5330-00-144-3325
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 644-1 MFR: Zyxel ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
APERTURE DIAMETER: 0.945 INCHES MINIMUM AND 0.950 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
OUTSIDE DIAMETER: 1.062 INCHES NOMINAL IN
STYLE DESIGNATOR: CIRCULAR
CROSS-SECTIONAL THICKNESS: 0.031 INCHES NOMINAL IN
MATERIAL: CORK AND RUBBER SYNTHETIC OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
APERTURE DIAMETER0.945 INCHES MINIMUM AND 0.950 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OUTSIDE DIAMETER1.062 INCHES NOMINAL IN
STYLE DESIGNATORCIRCULAR
CROSS-SECTIONAL THICKNESS0.031 INCHES NOMINAL IN
MATERIALCORK AND RUBBER SYNTHETIC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
6441Interchangeable
interchangeable cross-reference
interchangeable
DA6441Interchangeable
interchangeable cross-reference
interchangeable
14U1037PCDA6441Interchangeable
interchangeable cross-reference
interchangeable
341633Interchangeable
interchangeable cross-reference
interchangeable
695629Interchangeable
interchangeable cross-reference
interchangeable
708-126Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 644-1?
644-1 is a TEST STAND,HYDRAULIC SYSTEM COMP manufactured by Zyxel.
What parts can replace 644-1?
There are 15 known substitutes for 644-1: 6441, DA6441, 14U1037PCDA6441 and 12 more. Substitute compatibility should be verified for your specific system.
Is 644-1 still available?
644-1 is currently cancelled.
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