Socketweld Class 3000 Unions

• Overview
• 3D Animations
• Specifications
• Datasheets
• O-Rings
• Ordering

Fail Safe Leakproof Reliability

At any pressure, HART O-Rings actually strengthen the seal rather than loosen it.

STANDARD O-RINGS
V	Viton® Florocarbon A (FKM-A)
E	Ethylene Propylene (EPDM)
ES	High-Temp Steam EPDM [up to 550*F max] (EPDM E0962)
T	Teflon® Tetrafluoroethylene (PTFE)
B	Nitrile / Buna N (NBR)
SPECIALTY O-RINGS / SEALS
N	Neoprene® Polycloroprene (CR)
K	Kalrez® 4079 Perfluoroelastomer (FFKM)
HN	Hydrogenated Nitrile (HNBR)
EP	NSF-61 Approved EPDM (Ethylene Propylene)
G	Metallic Graphite Spiral Wound Seal
I	No O-Ring (Integral Seat "Ball to Cone")
Teflon®, Viton®, Kalrez® are Registered Trademarks from DuPont

Static

The O-ring is fitted into a machined groove between the two halves of the union. When the halves are drawn together the O-ring compresses to an ovalized cross-section, forming a positive, resilient seal which serves to block the fluid, thus sealing even at low or no pressure.

Under Load

As pressure is increased the O-ring is forced to flow and is "squeezed" into the downstream side causing the O-ring to conform to the shape of the end, blocking the groove gap. The more the system pressure increases, the more effective the seal.

Straight-Away Breakout

The flat faced construction allows for slipping the component in and out without disturbing the surrounding tube or pipe sections. Pipe alignment is much easier with Hart Unions since it is unnecessary to spring the line during make-up or disassembly.

Specialty Orders

Specialty O-Rings also available. Inquire within.

Ordering

The charts below contain all the information necessary to place an order. Use the appropriate codes in the manner shown below.

Example: a Class 3000 Female Threaded 1" Union with Viton O-ring and 316 Stainless Steel Ends is coded as follows:


When a size reduction or change in material is needed, simply enter the Tailpiece code and then the Threadpiece code separated by a slash as shown below.

Example: A Dielectric Class 3000 Union with a Dielectric Coated A105 Carbon Steel Tailpiece that is 3/4" Female NPT, with a 304 Stainless 1/2" Male NPT Threadpiece, Teflon O-Ring, is coded as follows:


For more information, a quote, or to order, call 1-800-769-0503 or contact us at sales@hartindustries.com

DESCRIPTION	TAIL	THREAD PIECE	SIZE	O-RING
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® Florocarbon A (FKM-A) E Ethylene Propylene (EPDM) ES High-Temp Steam EPDM [up to 550*F max] (EPDM E0962) T Teflon® Tetrafluroethylene (PTFE) 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") Teflon®, Viton®, Kalrez® are Registered Trademarks from DuPont
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
Sweat Copper 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

MATERIAL	OPTIONS (PREFIX)
A Aluminum B Brass 464 or 360 CS A105 Carbon Steel 304 A182F304/304L Stainless Steel 304L A182F304/304L Stainless Steel 316 A182F316/316L Stainless Steel 316L A182F316/316L Stainless Steel A20 Allloy 20 (formally known as carpenter steel C20) 73 70/30 Copper Nickel 91 90/10 Copper Nickel H Hastelloy C-276 I Inconel 600 M Monel 400 T Titanium	O Orifice D Dielectric (Insulating) H Hammer Lug

CUSTOM OPTIONS AVAILABLE
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. ACME Nut ACME Thread Nut for specialty applications

Call to Order: 800-769-0503

3333 Series

Socket Weld Pipe, Class 3000 Unions

HART Industrial O-Ring Unions are engineered to provide Class 3000 Service and are the most popular union in the industry for general purpose applications. The flat face design provides turbulence-free fit across seats. This design is ideal where piping requirements dictate the necessity of having a flat face seal to make and break the pipe line. All HART Unions are made in the USA!

Standard O-Ring Union Features:

• Turbulence Free: All unions provide a turbulence-free fit across the seats
• O-Ring Isolation: The O-Ring seal is strategically located in the thread piece face reducing O-Ring media contact and added protection against abrasives and erosion.
• Precision Machined components: All unions are precision machined to provide high quality and fail-safe leak proof reliability.
• Interchangeable End Connections: Threaded, socket weld, and butt-weld ends are interchangeable. This feature reduces overall costs by eliminating unnecessary nipples, bushings, couplings and inserts.
• Material Versatility: Unions can be provided in all standard metals or combination of metals. This includes 304 Stainless, 316 Stainless, A 105 Carbon Steel, Brass, Monel 400, Hastalloy, and Titanium.
• Excellent vibration resistance: Seals will not loosen, even under extreme pressure and pressure surges.

3D Animations

Specifications

SIZE	A-NPS	B	C-HEX	D	E TAIL	F-THREAD	WEIGHT (LBS)
3333-1	1/4"	1.63	1.50	0.86	0.78	0.83	0.33
3333-2	3/8"	1.82	1.69	1.02	0.88	0.91	0.4
3333-3	1/2"	1.94	1.87	1.23	0.92	0.99	0.7
3333-4	3/4"	2.36	2.20	1.46	1.11	1.23	1
3333-5	1"	2.45	2.62	1.79	1.17	1.25	1.75
3333-6	1-1/4"	2.80	3.03	2.16	1.38	1.39	2.5
3333-7	1-1/2"	3.01	3.37	2.42	1.50	1.17	3.5
3333-8	2"	3.40	4.14	2.96	1.65	1.72	4.25
3333-9	2-1/2"	4.03	5.00	3.61	1.98	2.01	6
3333-10	3"	4.30	5.62	4.30	2.13	2.13	8

Datasheets & Drawings