Maryland Metrics: Plumbing Fitting Details

R550-277  Elbow Union - Male to Female - Spherical Seat Bronze to Iron  


Male & Female elbow union

All sizes of unions and gaskets comply with the relevant BS or BSEN standard except size unions have union nut threads to Crane standard.

For further assistance please call our technical helpline on (410)358-3130 or (800)638-1830 or email us at techinfo@mdmetric.com.

When ordering GALVANISED fittings add the suffix “G” to the figure number.

M277 Unions are limited to 208C maximum.


These fittings have Taper threads providing the most effective jointing solution:

> Full engagement of the whole thread length - reliable strong joints
> No need for hemp filler - faster installation, lower costs
> High torques can be applied without risk of damaging the fitting
> Freedom to break and re-make joints
> Professional joint appearance

Taper threads make better joints

Following a policy of continuous development, Crane Fluid Systems reserves the right to alter specifications and dimensions shown in the e-catalog without prior notice.

Dimensional Drawing

BSEN 10242 & ISO 49 OR BS143 & BS1256
Connection Type
BS taper to BS21 and ISO7
Malleable Iron
Fitting Type
Dimensions and Weights
Size Weight
Pressure b
1 60.5 PN25 98 38 57
1/2 23.9 PN25 78 28 42
3/4 35.1 PN25 86 33 49

How to order: R550-xxx size (example: R550-144 1/2) or R550-xxxG size (example: R550-140G 1/2x1/4) for galvanized fittings where xxx is replaced by the figure number

Please note that not all of the fitting styles, sizes and materials are stocked in North America.
Please allow sufficient lead time for delivery, or check with us for availabilty.

Phones: (800) 638-1830 or (410) 358-3130 are available Monday-Friday 8:30 AM to 5:30 PM Eastern time.
Faxes: (800) 872-9329 or (410) 358-3142 & E-mail are available anytime.
Warehouse & showroom hours are Monday-Friday 10 AM to 5:30 PM.
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