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Maryland Metrics: Plumbing Fitting Details

R550-257  Straight Union - Male to Female - Spherical Seat Iron to Iron  
 
Details

SPECIFICATION

Type
Straight union, male and female

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.


TAPER THREADS

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


Standard
BS EN 1042 & ISO 49
Connection Type
BS taper to BS21 and ISO7
Material
Malleable Iron
Fitting Type
Unions
Dimensions and Weights
Size Weight
(kg/100)
Pressure b
(mm)
a
(mm)
f
(mm)
1 45.5 PN25 82 57 57
1.1/2 89.5 PN25 95 76  
1.1/4 66.3 PN25 91 68  
1/2 22.1 PN25 68 56 42
1/4 11.9 PN25 57 32  
2 135.5 PN25 104 92  
2.1/2 228.2 PN25 116 111  
3 308.2 PN25 131 125  
3/4 31 PN25 74 74 49
3/8 15.6 PN25 61 36  


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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