Hart Industries
Products
   3000 lb. Threaded FNPT Unions
   3000 lb. Threaded MNPT Unions
   3000 lb. Socketweld Pipe Unions
   3000 lb. Socketweld Tube Unions
   3000 lb. Buttweld Pipe Unions
   Copper Sweat Tube Unions
   6000 lb. Threaded Pipe Unions
   6000 lb. Socketweld Tube Unions
   6000 lb. Buttweld Pipe Unions
   Orifice Unions
   Dielectric Insulated Unions
   Steam Unions
   Handlebar, Lug-Nut Unions
   How to Order ©
 
 
  
HART O-Ring Unions - Manufacturing Specifications
Material  Meets:
Stainless Steel *

 ASTM A182 F304 & L
 ASTM A182 F316 & L

Carbon Steel

 ASTM A105

Low Temperature

 ASLF2 TM A350 LF1
 ASTM A350

Dimensions  

Pipe Threads

  MSS SP-83 (ANSI B2.1 Now ANSI B1.20.1 REV 95)
Unified Screw Threads
(Nut threads)		  ANSI/ASME B1.1
Socket Weld Ends  ANSI B16.11
Butt Weld Ends  ANSI B16.9
Socket Weld Wall Dimensions  ANSI/ASME B36.10M
Quality  MSS SP-83
Surface Finish  MSS SP-83
Testing  MSS SP-83
Identification The unions can be identified by the "WOG" pressure rating (3000 or 6000) which
is included in the figure number marked on the union surface.
Installation & Maintenance Initial Installation-Turn nut hand tight and wrench one quarter (1/4) turn maximum.
No further maintenance is required.
   * All HART Stainless unions have 303SS grade nuts to minimize galling.
   316SS grade nuts available on request.
   
Pressure Ratings These unions shall be designated as Class 3000 socket-welding or threaded and shall
carry ratings shown in Table 1 of Mil Spec MSS SP-83
 Table 1

Pressure-temperature service rating class 3000 carbon stainless srteel unions socket welding & threaded ends.

 
NON-SHOCK WORKING PRESSURE psig
SERVICE * Temp. Degree F ASTM A105 Carbon Steel ASTM A182 F316 ASTM A182 F304L F316L ASTM A182 F304
100 3000 2915 2430 2915
200 2735 2510 2050 2430
300 2655 2265 1835 2140
400 2565 2080 1670 1905
500 2425 1935 1535 1770
600 2220 1830 1460 1680
650 2180 1800 1420 1650
700 2155 1750 1390 1630
750   1710 1360 1610
800   1680 1330 1595
850   1645 1300 1575
900   1595   1555
950   1565   1515
1000   1470   1300
Note: These ratings may be lowered by the temperature limitations of the specific O-Ring used. Integral seat "come to ball" unions fully rated.