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AEROQUIP 491 HOSE FITTINGS
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Description | Tube | Thread | Part No. | Price | Buy | Sub-Total |
Aeroquip 491 Hose Fitting | 3/16 | 3/8-24 | 491-3 | $14.75 | ||
Aeroquip 491 Hose Fitting | 1/4 | 7/16-20 | 491-4 | $10.95 | ||
Aeroquip 491 Hose Fitting | 5/16 | 1/2-20 | 491-5 | $14.65 | ||
Aeroquip 491 Hose Fitting | 3/8 | 9/16-18 | 491-6 | $15.75 | ||
Aeroquip 491 Hose Fitting | 1/2 | 3/4-16 | 491-8D | $16.95 | ||
Aeroquip 491 Hose Fitting | 5/8 | 7/8-14 | 491-10D | $26.75 | ||
Aeroquip 491 Hose Fitting | 3/4 | 1-1/16-12 | 491-12D | $34.85 | ||
Current Total
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Aeroquip 491 and 471 hose fittings consist of an AN818 style nut, an externally threaded 37 nipple and an internally threaded hose socket. Fittings of sizes 3 through 6 have nuts and nipples of cadmium plated steel. Nuts and nipples for size 8 and larger are of anodized aluminum. Fittings conform to MS24587. |
- Tech Data Sheet (PDF)

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Great for making new hoses for repairs. Be sure to get the mandrel to install these. |
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This is a great item to use. Steel fitting and aluminum hose sleeve. I used a steel plug and a ratchet to thread the fitting into the hose. I also used oil to help with the threading into the hose. Once it has set for a few days it is almost impossible to un-thread the fitting. I did once and ripped the hose off the end that was in the vice and then I was able to reuse the fitting. Just the hose was now too short. |
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Easy to assemble. |
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Great project part for student projects. |

When referencing the tube size, is this an ID or OD measurement?
The tube size is in reference to the O.D. of the hard line the 303 hose, & 491 fitting, is replacing.
Description | Part Number | Price | Buy | |
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EATON AEROQUIP HOSE 303-3 3/16 | 303-3 | $6.85 | |
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EATON AEROQUIP HOSE 303-4 1/4" | 303-4 | $7.50 | |
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EATON AEROQUIP HOSE 303-5 5/16" | 303-5 | $7.85 | |
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EATON AEROQUIP HOSE 303-6 | 303-6 | $8.65 | |
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EATON AEROQUIP HOSE 303-8 1/2" | 303-8 | $9.55 | |
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EATON AEROQUIP HOSE 303-10 5/8" | 303-10 | $9.95 | |
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EATON HOSE 303-12 3/4" | 303-12 | $11.80 | |
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EATON MANDREL # S-1051-3 | 05-01918 | $124.90 | |
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EATON ASSEM. 1/4" MANDRELS | 05-01919 | $98.90 | |
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EATON MANDREL S1051-5 | 05-02038 | $142.85 | |
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EATON MANDREL 3/8 S-1051-6 | 05-01920 | $99.75 | |
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EATON MANDREL S1051-8 | 05-02039 | $91.75 | |
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EATON MANDREL S-1051-10 | 05-02037 | $123.75 | |
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EATON ASSEM. 3/4" MANDRELS | 05-02129 | $346.00 |
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