MGA Part Numbers - UHN105, UHN205, UHN305, UHN400, UHN405

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MGA Part Numbers - UHN105, UHN205, UHN305, UHN400, UHN405

Most of the grease fittings on the MGA will have 1/16-BSPT threads. British Standard Pipe Tapered.

The UHN105 straight fitting seems to be superseded by UHN305, essentially same part and interchangeable.
UHN205 is the 45 degree fitting.
UHN405 is the 90 degree fitting.
UHN400 is another straight fitting, but may be a smaller thread size.

PART NO.  SPL.PAGE  DESCRIPTION                                                            
UHN105    15.J.2    Lubricator for pinion (LHD) (top of rack input) -(steering, 1500)
UHN105    16.J.2    Lubricator -pinion -LHD -(steering, 1600 and 1600-MK-II)
UHN205    15.J.2    Lubricator for pinion (RHD) (top of rack) -(steering, 1500)
UHN205    16.J.2    Lubricator -rack (top of rack) -(steering, 1600 and 1600-MK-II)
UHN205    16.J.2    Lubricator -pinion -RHD -(steering, 1600 and 1600-MK-II)
UHN205    TC.J.1    Greaser -rack -(steering, Twin Cam)
UHN305    TC.A.15   Greaser -(water.pump, engine, Twin Cam)
UHN305    TC.J.1    Greaser -pinion -(steering, Twin Cam)
UHN400    15.G.1    Lubricator -(front, propshaft, 1500, 3rd style) -Com.(C)61037-61504
    (interspersed)
UHN400    16.G.1    Lubricator -(front, propshaft, 1600 and 1600-MK-II)
UHN405    15.J.2    Lubricator for ball socket (2) (tie rod ends) -(steering, 1500)
UHN405    15.K.1    Lubricator for swivel pin (4) -(front suspension, 1500)
UHN405    16.J.2    Lubricator -Ball socket (2) -(steering, 1600 and 1600-MK-II)
UHN405    16.K.1    Lubricator -Swivel pin link (4) -(front axle and suspension, 1600 and
    1600-MK-II std.model)
UHN405    TC.J.2    Greaser -ball socket (2) -(tie rod end, steering, Twin Cam)
UHN405    TC.K.3    Lubricator for link (4) -(swivel links, front suspension, Twin Cam)

The common thread size is 1/16-BSPT (tapered), 28-threads per inch. The 1/16 size designation refers to the inside diameter of the pipe, so the outside diameter is much larger.

Being British standard, it is a Whitworth thread form with 55 degree thread angle. Being tapered the "official" major diameter is 0.304-inch at the 3-4 thread position. The largest diameter at the fat end of the thread is a bit more than 0.312", so you might get a 5/16-24-UNF bolt to screw in a turn or two before stopping tight.

The common American grease fitting sizes are 1/4-28 tapered (smaller than 1/16-BSPT) and 1/8-NPT tapered (larger than 1/16-BSPT). Knowing what you re looking for you can do a web search for 1/16-BSP (or 1/16-BSPT) grease fitting. Don't know if a hardware store would have them, but an auto parts store might.