O-Ring for Magnum/Handjak 55
MG 138
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Compatibility
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Visit our diagram page for part references to popular models
Product Description
Magnum Intrupa MG 138 O-Ring for manual pallet jack hydraulic pump. Buna-N (NBR) compounded, 70 Shore A, nominal dimensions 2.112 inch ID x 0.103 inch cross-section. Precision molded according to SAE J200/ASTM D2000 standards. Compatible with mineral hydraulic fluids, suitable for service up to 1500 PSI.
Compatibility: Fits pallet jacks made by Magnum, model 5000. SKU: MG 138
Specifications
Dimensional Specifications
| Section Tolerance | ±0.003 inch |
Material & Construction
| Elastomer Material | Nitrile (NBR) Buna-N |
| Finish | Molded precision, no surface coating |
Part Numbers
| Manufacturer Part Number | MG 138 |
| OEM Part Number | MG 138 |
Frequently Asked Questions
Q: What are the specifications of the MG 138 O-Ring?
A: The MG 138 is a Buna-N (NBR) elastomer O-Ring with 70 Shore A hardness. Dimensions are 2.112 inch inner diameter with 0.103 inch cross-section. It is precision molded to SAE J200 and ASTM D2000 standards and rated for service up to 1500 PSI.
Q: Which pallet jacks use the MG 138 O-Ring?
A: The MG 138 is compatible with Magnum model 5000 manual pallet jack hydraulic pump assemblies. Verify your equipment model before ordering.
Q: Is the MG 138 compatible with all hydraulic fluid types?
A: The MG 138 is compatible with mineral hydraulic fluids. Do not use with synthetic fluids, water-based fluids, or other non-mineral hydraulic media, as incompatibility can cause premature degradation and seal failure.
Q: What pressure rating does the MG 138 support?
A: The MG 138 is rated for service up to 1500 PSI. Do not exceed this pressure limit as it will compromise seal integrity and cause leakage.
Q: How long does the MG 138 O-Ring typically last before replacement?
A: O-Ring lifespan depends on fluid condition, temperature extremes, and pressure cycling. Under normal conditions, Buna-N seals typically function for 3 to 5 years. More frequent replacement may be needed in cold storage or high-temperature environments. Inspect for cracking, hardening, or loss of elasticity.