Please reference the two examples below which include descriptions of the unions and their corresponding HART Part Numbers.

HART How to Order - Example 1 imageExample 1: Class 3000, 1″ Female NPT x 1″ Female NPT, Viton O-Ring, Stainless Steel 316 connections

HART How to Order - Example 2 imageExample 2: Dielectric Class 3000 Union, 1″ Male NPT x 3/4″ Copper Sweat, EPDM O-Ring, Stainless Steel 304L Tailpiece with dielectric coating, Lead-free Brass 464 Threadpiece

The chart below contains the necessary information to place an order. Use the appropriate code that corresponds to your application. When a size reduction or change in material is needed, simply use a slash (“/”) between the sizes or materials.

Please reference the two examples below which include descriptions of the unions and their corresponding HART Part Numbers.

OPTIONS (PREFIX)
O Orifice:
Flat Orifice Plate with Double O-Ring Seal
D Dielectric (Insulated):
Dielectric Coating applied to union tailpiece
H Hammer Nut:
3-Lug Hammer Blow / Lug Nut Option
DESCRIPTION TAIL PIECE THREAD PIECE SIZE O-RING MATERIAL
Female NPT (FNPT) Class 3000 Pipe 31 31 0  (1/8″)
1  (1/4″)
2  (3/8″)
3  (1/2″)
4  (3/4″)
5  (1″)
6  (1 1/4″)
7  (1 1/2″)
8  (2″)
9  (2 1/2″)
10 (3″)
11 (3 1/2″)
12 (4″)
STANDARD O-RINGS
V Viton® Fluorocarbon A (FKM-A)
E Ethylene Propylene (EPDM)
ES High-Temp Steam EPDM [up to 550*F max] (EPDM E0962)
T Teflon® Tetrafluoroethylene (PTFE)
B Buna-N (Nitrile)
SPECIALTY O-RINGS / SEALS
N Neoprene® Polychloroprene (CR)
K Kalrez® 4079 Perfluoroelastomer (FFKM)
HN Hydrogenated Nitrile (HNBR)
EP NSF-61 Approved Ethylene Propylene (EPDM)
G Metallic Spiral Wound Graphite Seal
I No O-Ring (Integral Seat “Ball and Cone”)
Viton®, Teflon®, Neoprene®, and Kalrez® are registered trademarks of their respective owners.
A Aluminum 6061
B Brass 360 or 464
CS A108 (12L14) Carbon Steel and A105/A350-LF2 Carbon Steel
CSN A105 Normalized (specialty) Carbon Steel
304L A182F304/304L Stainless Steel
316L A182F316/316L Stainless Steel
73 70/30 Copper Nickel
91 90/10 Copper Nickel
H Hastelloy C276
I Inconel 600
M Monel 400
T Titanium T-2
A20 Alloy 20 (Carpenter Steel C20)
Male NPT (MNPT)
Class 3000 Pipe		 32 32
Socket Weld (SW)
Class 3000 Pipe		 33 33
Socket Weld (SW)
Class 3000 Tube		 34 34
Butt Weld (BW)
Class 3000 Pipe		 35 35
Copper Sweat (SWEAT)
Class 3000 Tube		 36 36
Female NPT (FNPT)
Class 6000 Pipe		 61 61
Male NPT (MNPT)
Class 6000 Pipe		 62 62
Socket Weld (SW)
Class 6000 Pipe		 63 63
Socket Weld (SW)
Class 6000 Tube		 64 64
Butt Weld (BW)
Class 6000 Pipe		 65 65
SUFFIX (ADDITIONAL INFO) CUSTOM OPTIONS AVAILABLE
Male NPT (MNPT), Socket Weld (SW), and Butt Weld (BW):
Place desired Wall Thickness in parentheses. Note: S40 Standard for Class 3000 and S80 Standard for Class 6000 unless otherwise specified.
Examples:
6262-5-V-304(S160)
3335-7-E-CS(S80)
Orifice Unions: Place desired drilled orifice bore in parentheses. For blank plate, omit the bore or note “(blank)”.
Examples:
O-3131-5-V-304(0.250″)
O-3333-4-B-316(blank)

 
BSPT-F BSPT (British Standard Pipe Taper) – Female, Rc
BSPT-M BSPT (British Standard Pipe Taper) – Male, R
BW TUBE Butt Weld with Tube O.D.
MALE PIPE END Male Pipe End (unthreaded) for socket welding.
ACME Nut ACME Thread Nut for specialty applications

 

For more information, a quote, or to order, call 1-800-769-0503 or contact us at [email protected]