API Standard High Quality Fmc Hammer Union

Description

Goldenman Hammer Unions provide fast, reliable and reusable connections for oilfield flowlines, manifolds, pumps, hoses, swivel joints, pup joints and pressure-control equipment.

The complete product range covers five nominal sizes:

• 1 in
• 1-1/2 in
• 2 in
• 3 in
• 4 in

Available pressure classes range from 1,000 to 20,000 psi, with threaded, butt-weld and H₂S-service configurations.

The Goldenman Hammer Union series includes:

• Fig 100
• Fig 200
• Fig 206
• Fig 400
• Fig 402
• Fig 602
• Fig 1002
• Fig 1502
• Fig 2002
• Fig 2202
• Tr120×6
• Tr150×6
• Tr180×8

Each union consists of a male sub, female sub, wing nut and a model-specific sealing system. The forged wing nut uses rigid ACME threads and external hammer lugs for rapid makeup and disassembly without special rotating tools.

Different pressure classes are identified through permanent forged markings and pressure-specific color coding.

Product Short Description

Goldenman Oilfield Hammer Unions are forged high-pressure connectors designed for drilling, cementing, fracturing, acidizing, well testing, flowback and production operations.

The range includes 1–4-inch threaded Hammer Unions, 2–4-inch butt-weld Hammer Unions and H₂S-service connections with rated working pressures from 1,000 to 20,000 psi.

Precision-machined sealing surfaces, rigid ACME threads and replaceable seal rings provide secure connection, rapid installation and repeatable field maintenance.

Product Highlights

• Complete 1–4 in Hammer Union range
• Working pressures from 1,000 to 20,000 psi
• API Spec 7HU2 product configurations
• Threaded, butt-weld and H₂S-service designs
• Fig 100 through Fig 2202 pressure classes
• Male sub, female sub and wing-nut construction
• Forged high-strength alloy-steel components
• Rigid ACME wing-nut threads
• Rapid hammer makeup and disassembly
• Full-bore internal flow passage
• Metal-to-metal and pressure-seal designs
• Replaceable O-ring and lip-type seal options
• NBR, HNBR and FKM seal materials
• Standard- and sour-service material packages
• Permanent size and pressure markings
• Pressure-specific color identification
• Metric Tr120×6, Tr150×6 and Tr180×8 options
• Line-pipe-threaded and butt-weld ends
• Material and heat-number traceability
• Dimensional and thread-gauge inspection
• UT and MPI inspection
• Hydrostatic proof testing
• Individual components and complete repair kits
• Export packaging with connection protectors

General Technical Specifications

Parameter	Available Range
Product	Oilfield Hammer Union
Applicable standard	API Spec 7HU2
Nominal sizes	1, 1-1/2, 2, 3 and 4 in
Rated working pressure	1,000–20,000 psi
Pressure range	7–140 MPa
Union figures	Fig 100–Fig 2202
Connection types	Threaded, butt weld and H₂S butt weld
Metric connections	Tr120×6, Tr150×6 and Tr180×8
Main components	Male sub, female sub, wing nut and seal
Main material	Forged high-strength alloy steel
Common material grades	AISI 4130, AISI 4140 and equivalent alloy steel
Heat treatment	Normalized, quenched and tempered
Wing-nut thread	Rigid ACME thread
Seal types	Metal-to-metal, O-ring and lip-type pressure seal
Seal materials	NBR, HNBR, FKM and engineered elastomers
End preparations	Line-pipe thread, tubing thread and butt weld
Service	Standard, abrasive, corrosive and H₂S service
Identification	Forged size, figure and pressure markings
Inspection	Dimensional, thread, hardness, UT and MPI
Pressure test	Hydrostatic proof test
Supply form	Complete union or individual components

Complete Size and Pressure Matrix

Threaded Hammer Unions

Union Figure	Rated Working Pressure	1 in	1-1/2 in	2 in	3 in	4 in
Fig 100	1,000 psi / 7 MPa	—	—	✓	—	—
Fig 200	2,000 psi / 14 MPa	✓	—	✓	—	—
Fig 206	2,000 psi / 14 MPa	—	—	—	—	✓
Fig 400	4,000 psi / 28 MPa	✓	—	—	—	—
Fig 402	4,000 psi / 28 MPa	—	—	—	✓	—
Fig 602	6,000 psi / 42 MPa	✓	✓	✓	✓	✓
Fig 1002	10,000 psi / 70 MPa	✓	✓	✓	✓	✓
Fig 1502	15,000 psi / 105 MPa	✓	✓	✓	✓	—

Butt-Weld Hammer Unions

Union Figure	Rated Working Pressure	1 in	1-1/2 in	2 in	3 in	4 in
Fig 206	2,000 psi / 14 MPa	—	—	✓	✓	✓
Fig 602	6,000 psi / 42 MPa	—	—	✓	✓	✓
Fig 1002	10,000 psi / 70 MPa	—	—	✓	✓	✓
Fig 1502	15,000 psi / 105 MPa	—	—	✓	✓	—
Fig 2002	20,000 psi / 140 MPa	—	—	✓	✓	—

H₂S-Service Butt-Weld Hammer Unions

Union Figure	Rated Working Pressure	1 in	1-1/2 in	2 in	3 in	4 in
Fig 602	5,000 psi / 35 MPa	—	—	✓	✓	✓
Fig 602	6,000 psi / 42 MPa	—	—	✓	✓	—
Fig 1002	7,500 psi / 53 MPa	—	—	✓	✓	✓
Fig 1502	10,000 psi / 70 MPa	—	—	✓	✓	✓
Fig 2202	15,000 psi / 105 MPa	—	—	✓	✓	✓

Metric H₂S-Service Connections

Connection	Rated Working Pressure	Corresponding Size
Tr120×6	5,000 psi / 35 MPa	2 in
Tr150×6	5,000 psi / 35 MPa	3 in
Tr180×8	5,000 psi / 35 MPa	4 in

Hammer Union Construction

A complete Hammer Union consists of four primary elements.

Male Sub

The male sub provides:

• Male sealing nose
• Internal full-bore flow passage
• Threaded or butt-weld pipe end
• Axial connection shoulder
• Seal-contact surface
• Permanent size and pressure marking

The male nose enters the female sub and aligns the internal flow path.

Female Sub

The female sub provides:

• Female sealing cavity
• Wing-nut engagement area
• Internal pressure-seal location
• Threaded or butt-weld pipe end
• Full-bore flow passage
• Pressure-containing connection shoulder

The female sub receives the male nose and supports the selected seal arrangement.

Wing Nut

The wing nut connects the male and female subs.

Its main features include:

• Forged alloy-steel construction
• Two- or three-lug hammer profile
• Rigid ACME internal threads
• High axial load capacity
• Permanent figure and pressure markings
• Pressure-class color identification

Hammer blows applied to the external lugs rotate the nut and draw the two union subs together.

Seal Ring

The seal forms the primary pressure barrier in pressure-seal union designs.

Available sealing elements include:

• O-rings
• Lip-type pressure seals
• Metal-to-metal sealing noses
• H₂S-compatible elastomer seals
• High-temperature seal rings
• Low-temperature seal rings

The seal profile and material are matched to the union figure, fluid and operating temperature.

Threaded Hammer Unions

Threaded Hammer Unions connect directly to threaded oilfield pipe, valves, manifolds and pressure fittings.

Available thread preparations include:

• API line-pipe threads
• Tubing threads
• Project-specific oilfield threads
• Female threaded union subs
• Male threaded union subs
• Threaded blind unions

Threaded configurations provide:

• Rapid equipment assembly
• Compact installation
• Easy component replacement
• Reduced field welding
• Reusable modular flowline layouts

Each thread is inspected using calibrated gauges for taper, lead, pitch diameter, crest and root geometry.

Butt-Weld Hammer Unions

Butt-Weld Hammer Unions are welded directly into pup joints, elbows, swivel joints, manifolds and high-pressure straight pipes.

The weld-end design includes:

• Controlled outside diameter
• Controlled inside diameter
• Machined weld bevel
• Specified root face
• Defined included angle
• Heavy-wall pressure section
• Smooth internal flow transition

Available configurations include:

• Male weld sub
• Female weld sub
• Union-to-pup-joint assembly
• Union-to-elbow assembly
• Union-to-swivel-joint assembly
• Union-to-flange transition
• Complete welded manifold assembly

Welded assemblies use qualified welding procedures, controlled preheat and post-weld inspection.

H₂S-Service Hammer Unions

H₂S-service unions are manufactured for sour oil, sour gas and well-service fluids containing hydrogen sulfide.

The sour-service configuration includes:

• Controlled-hardness pressure-containing materials
• H₂S-resistant heat treatment
• NACE MR0175/ISO 15156 material selection
• H₂S-compatible seal compounds
• Hardness testing
• Material traceability
• UT and MPI examination
• Sour-service identification markings

Sour-service ratings include:

• Fig 602 at 5,000 or 6,000 psi
• Fig 1002 at 7,500 psi
• Fig 1502 at 10,000 psi
• Fig 2202 at 15,000 psi

The reduced pressure ratings support controlled material hardness and resistance to sulfide stress cracking.

Fig 100 Hammer Union

Fig 100 is a low-pressure connection with a rated working pressure of:

1,000 psi / 7 MPa

The Goldenman range includes a 2-inch threaded Fig 100 configuration.

Applications include:

• Low-pressure manifolds
• Water-transfer lines
• Air lines
• General fluid service
• Suction systems
• Low-pressure mud circulation

The connection uses a precision-machined sealing interface and rapid wing-nut makeup.

Fig 200 Hammer Union

Fig 200 has a rated working pressure of:

2,000 psi / 14 MPa

Available Goldenman threaded sizes include:

• 1 in
• 2 in

Applications include:

• Low-pressure mud lines
• Water and oil lines
• Air systems
• General manifold connections
• Pump suction and discharge support lines

Fig 206 Hammer Union

Fig 206 has a rated working pressure of:

2,000 psi / 14 MPa

Available configurations include:

• 4-inch threaded union
• 2-inch butt-weld union
• 3-inch butt-weld union
• 4-inch butt-weld union

The replaceable sealing element protects the metal contact surfaces and improves sealing in corrosive and general fluid service.

Fig 400 Hammer Union

Fig 400 has a rated working pressure of:

4,000 psi / 28 MPa

The Goldenman product range includes a 1-inch threaded configuration.

It is used in:

• Medium-pressure manifolds
• Oilfield service lines
• Pump connections
• Water and oil systems
• General pressure-transfer equipment

Fig 402 Hammer Union

Fig 402 has a rated working pressure of:

4,000 psi / 28 MPa

The Goldenman range includes a 3-inch threaded Fig 402 configuration.

The pressure-seal arrangement provides dependable sealing for medium-pressure pumping, mud and well-service systems.

Fig 602 Hammer Union

Fig 602 has a standard working-pressure rating of:

6,000 psi / 42 MPa

Threaded sizes include:

• 1 in
• 1-1/2 in
• 2 in
• 3 in
• 4 in

Butt-weld sizes include:

• 2 in
• 3 in
• 4 in

Sour-service configurations include:

• 2–4 in at 5,000 psi
• 2–3 in at 6,000 psi

Fig 602 applications include:

• Cementing lines
• Drilling-fluid manifolds
• Acidizing systems
• Mud pump connections
• Well-service flowlines
• Production-test systems

The union uses a replaceable pressure seal to isolate the connection threads from line fluid.

Fig 1002 Hammer Union

Fig 1002 has a standard working-pressure rating of:

10,000 psi / 70 MPa

Threaded sizes include:

• 1 in
• 1-1/2 in
• 2 in
• 3 in
• 4 in

Butt-weld sizes include:

• 2 in
• 3 in
• 4 in

The sour-service Fig 1002 configuration is rated at:

7,500 psi / 53 MPa

H₂S-service sizes include:

• 2 in
• 3 in
• 4 in

Applications include:

• High-pressure cementing
• Acid stimulation
• Well testing
• Flowback
• Production testing
• High-pressure mud systems
• Water and gas injection

Fig 1502 Hammer Union

Fig 1502 has a standard working-pressure rating of:

15,000 psi / 105 MPa

Threaded sizes include:

• 1 in
• 1-1/2 in
• 2 in
• 3 in

Butt-weld sizes include:

• 2 in
• 3 in

The sour-service Fig 1502 configuration is rated at:

10,000 psi / 70 MPa

H₂S-service sizes include:

• 2 in
• 3 in
• 4 in

Applications include:

• Hydraulic fracturing
• High-pressure cementing
• Acidizing
• Choke and kill systems
• High-pressure well testing
• Flowback manifolds
• Nitrogen pumping
• Pump-discharge manifolds
• Sand-laden stimulation lines

Fig 2002 Hammer Union

Fig 2002 has a rated working pressure of:

20,000 psi / 140 MPa

Available butt-weld sizes include:

• 2 in
• 3 in

Fig 2002 is used in ultra-high-pressure applications such as:

• High-pressure stimulation systems
• Pressure-testing equipment
• Pump-discharge manifolds
• Specialized injection systems
• Ultra-high-pressure temporary flowlines

Fig 2202 Hammer Union

Fig 2202 is designed for high-pressure sour-service applications.

Its rated working pressure is:

15,000 psi / 105 MPa

Available H₂S-service sizes include:

• 2 in
• 3 in
• 4 in

The assembly uses controlled-hardness alloy steel and H₂S-compatible sealing materials.

Hammer Union Sealing Systems

Metal-to-Metal Seal

Low-pressure and general-service unions use precision-machined metallic contact surfaces to establish the main sealing interface.

Metal-to-metal sealing provides:

• Simple construction
• Rapid assembly
• Resistance to seal displacement
• Compatibility with general fluid service
• Easy inspection and cleaning

O-Ring Seal

An O-ring installed in the male or female sub improves sealing and protects the metallic contact surfaces from corrosion and erosion.

Available O-ring materials include:

• NBR
• HNBR
• FKM
• Low-temperature elastomer
• Sour-service elastomer

Lip-Type Pressure Seal

High-pressure Fig 602, Fig 1002, Fig 1502 and Fig 2002 unions use replaceable lip-type pressure seals.

Internal pressure energizes the seal lips against the male and female sealing surfaces.

The lip-type design provides:

• High-pressure sealing
• Protection of the union threads
• Reduced fluid contact with metallic seating surfaces
• Easy field replacement
• Compatibility with standard and sour-service fluids

Materials

Union Subs

Male and female subs are manufactured from forged high-strength alloy steel, including:

• AISI 4130
• AISI 4140
• Equivalent quenched-and-tempered alloy steel

The material provides:

• High tensile strength
• High yield strength
• Impact toughness
• Fatigue resistance
• Pressure-cycle resistance
• Stable heat-treatment response

Wing Nut

The wing nut uses high-strength forged alloy steel with controlled toughness and hardness.

The forging process creates continuous material flow around the lugs and thread body, improving resistance to impact and axial loading.

Seal Materials

Available seal materials include:

• NBR for standard oilfield fluids
• HNBR for heat, oil and H₂S resistance
• FKM for elevated temperature and aggressive chemicals
• Low-temperature elastomers for cold environments
• Engineered polymer seals for severe pressure service

Full-Bore Flow Passage

The male and female subs are machined to create a continuous internal flow path.

A controlled full-bore passage provides:

• Reduced pressure loss
• Lower turbulence
• Improved slurry transport
• Reduced local erosion
• Easier flushing
• Reduced solids accumulation
• Stable high-rate pumping

The internal transition is inspected for bore alignment, surface condition and dimensional accuracy.

Fast Field Connection

The wing nut and ACME thread allow the connection to be made up rapidly.

The installation sequence includes:

1. Clean the male and female subs.
2. Inspect the sealing surfaces.
3. Install the correct seal ring.
4. Insert the male sub into the female sub.
5. Engage the wing nut.
6. Rotate the nut by hand.
7. Apply controlled hammer blows to the lugs.
8. Verify full connection engagement.
9. Pressure-test the completed flowline.

The connection does not require flange studs, torque wrenches or complex alignment tools.

Figure and Pressure Identification

Every Goldenman Hammer Union carries permanent markings identifying:

• Nominal size
• Union figure
• Rated working pressure
• Connection type
• Standard- or sour-service designation
• Material heat number
• Product batch or serial number

Pressure-specific color coding supports rapid visual identification in the field.

Forged markings remain the primary product-identification method after painting and field use.

Applications

Goldenman Hammer Unions are used in:

• Hydraulic fracturing systems
• Cementing manifolds
• Acidizing lines
• Choke manifolds
• Kill manifolds
• Mud manifolds
• Standpipe manifolds
• Pump-discharge lines
• Well-testing packages
• Flowback manifolds
• Production-test equipment
• Coil-tubing support equipment
• Nitrogen-pumping systems
• Water-injection systems
• Drilling-fluid circulation
• Temporary high-pressure piping
• High-pressure hoses
• Pup joints
• Swivel joints
• Wellhead flowlines

Connection Compatibility

Hammer Union compatibility is determined by:

• Nominal size
• Union figure
• Thread form
• Male nose profile
• Female sealing cavity
• Wing-nut thread
• Pressure-seal geometry
• Standard- or sour-service rating

Two components with the same nominal size are not automatically compatible when their Figure numbers differ.

A Fig 1002 component does not connect directly to a Fig 1502 component.

Mixed-Figure systems use engineered adapters carrying the pressure rating of the lowest-rated component.

Installation Requirements

Before installation:

• Verify the union size and Figure number.
• Verify the rated working pressure.
• Confirm standard or H₂S service.
• Inspect the male sealing nose.
• Inspect the female sealing cavity.
• Inspect the ACME threads.
• Inspect the wing-nut lugs.
• Install the correct seal ring.
• Clean all connection surfaces.
• Align the piping without side load.
• Support long or heavy flowline sections.
• Install flowline restraints.
• Complete the required pressure test.

The union must not be used to pull misaligned piping into position.

Inspection Before Use

Inspection includes:

• Body corrosion
• External impact damage
• Union thread wear
• Wing-nut lug damage
• Male nose damage
• Female sealing-cavity damage
• Seal cuts or deformation
• Bore erosion
• Weld condition
• Permanent markings
• Color identification
• Pressure classification

Unmarked, mismatched, cracked or severely eroded components are removed from pressure service.

Maintenance

Routine maintenance includes:

• Cleaning union components
• Replacing worn seals
• Lubricating ACME threads
• Inspecting sealing surfaces
• Inspecting wing-nut lugs
• Inspecting weld ends
• Measuring remaining wall thickness
• Restoring corrosion protection
• Installing end protectors
• Completing scheduled hydrostatic testing

Male and female components are stored with rigid protective caps.

Common Failure Modes

Union Leakage

Common causes include:

• Incorrect seal ring
• Damaged seal
• Mismatched Figure components
• Damaged sealing nose
• Incomplete wing-nut engagement
• Misaligned piping
• Excessive side load
• Eroded internal bore

Wing-Nut Damage

Common causes include:

• Excessive hammering
• Striking with unsuitable tools
• Damaged ACME threads
• Cross-threading
• Corrosion
• Mismatched union components

Internal Erosion

Common causes include:

• Sand-laden fracturing fluid
• Cement slurry
• High flow velocity
• Turbulence
• Corrosive fluid
• Extended pumping duration

Weld-End Failure

Common causes include:

• Incorrect welding procedure
• Inadequate preheat
• Poor weld alignment
• Incomplete penetration
• Excessive hardness
• Insufficient NDE
• External bending load

Manufacturing Process

Goldenman Hammer Union manufacturing includes:

1. Raw-material verification
2. Heat-number identification
3. Alloy-steel forging
4. Controlled heat treatment
5. Mechanical-property testing
6. Rough machining
7. Internal bore machining
8. Sealing-profile machining
9. ACME thread machining
10. Thread and profile gauging
11. Weld-end machining
12. Finish machining
13. Hardness inspection
14. Dimensional inspection
15. UT and MPI examination
16. Seal and component assembly
17. Hydrostatic proof testing
18. Surface protection
19. Permanent marking
20. Final documentation review
21. Export packaging

Quality Control and Testing

Inspection and testing include:

• Chemical-composition verification
• Mechanical-property testing
• Heat-treatment verification
• Impact testing
• Core-hardness testing
• Dimensional inspection
• Bore measurement
• ACME thread inspection
• Connection-profile inspection
• Seal-cavity inspection
• Male-nose inspection
• Weld-end inspection
• Ultrasonic testing
• Magnetic-particle testing
• Hydrostatic proof testing
• External leakage inspection
• Marking verification
• Final visual inspection

Testing uses calibrated pressure instruments and recorded hold times.

Product Documentation

The supply package includes:

• Certificate of Conformity
• Product datasheet
• General assembly drawing
• Connection-profile drawing
• Material certificate
• EN 10204 3.1 certificate
• Heat-treatment record
• Mechanical-property report
• Impact-test report
• Hardness report
• UT report
• MPI report
• Dimensional inspection report
• Thread-gauge inspection report
• Hydrostatic test report
• Material traceability record
• Packing list
• Third-party inspection report

Replacement Parts

Goldenman supplies:

• Male subs
• Female subs
• Wing nuts
• O-ring seals
• Lip-type pressure seals
• H₂S-service seals
• Low-temperature seals
• High-temperature seals
• Blind male unions
• Blind female unions
• Thread protectors
• Weld-end subs
• Union adapters
• Complete repair kits

Frequently Asked Questions

What sizes are available on this page?

The Goldenman range covers:

• 1 in
• 1-1/2 in
• 2 in
• 3 in
• 4 in

Size availability varies by union Figure and end connection.

Is this page only for a 2-inch Fig 1502 union?

No.

The page covers threaded, welded and H₂S-service Hammer Unions in five nominal sizes and pressure ratings from 1,000 to 20,000 psi.

Which Figures are available in all five sizes?

Threaded Fig 602 and Fig 1002 are available in 1, 1-1/2, 2, 3 and 4-inch sizes.

Which Fig 1502 sizes are available?

Threaded Fig 1502 is available in:

• 1 in
• 1-1/2 in
• 2 in
• 3 in

Butt-weld Fig 1502 is available in:

• 2 in
• 3 in

H₂S-service Fig 1502 is available in:

• 2 in
• 3 in
• 4 in

What is the maximum pressure rating?

Fig 2002 butt-weld unions provide a rated working pressure of 20,000 psi.

What is the highest sour-service pressure?

Fig 2202 H₂S-service unions provide a rated working pressure of 15,000 psi.

What is the difference between Fig 602 and Fig 1002?

Fig 602 has a standard working pressure of 6,000 psi.

Fig 1002 has a standard working pressure of 10,000 psi.

The two Figures use different connection and sealing geometry.

What is the difference between Fig 1002 and Fig 1502?

Fig 1002 is rated to 10,000 psi in standard service.

Fig 1502 is rated to 15,000 psi in standard service.

Their male subs, female subs, wing nuts and seals are not interchangeable.

Are threaded and welded unions available?

Yes.

The range includes threaded union subs and butt-weld union subs for integration into straight pipes, elbows, swivel joints and manifolds.

Are H₂S-service unions available?

Yes.

H₂S-service configurations include Fig 602, Fig 1002, Fig 1502, Fig 2202 and metric Tr connections.

Can different Figure numbers be connected together?

No.

Different Figures use different threads, sealing profiles and pressure ratings. A matched transition adapter is used between different connection systems.

Are replacement seals available?

Yes.

Goldenman supplies O-rings, lip-type pressure seals, H₂S-service seals and complete repair kits.

What does the color coding indicate?

Color coding supports identification of the union pressure and service class.

Permanent forged size, Figure and pressure markings provide the primary identification.

Can Goldenman supply individual union components?

Yes.

Male subs, female subs, wing nuts, seals, blind unions and complete assemblies are available.

Information Required for Quotation

Please provide:

• Nominal size
• Union Figure
• Rated working pressure
• Threaded or butt-weld connection
• Male or female end
• Complete union or individual component
• Thread specification
• Butt-weld pipe schedule
• Standard or H₂S service
• Minimum operating temperature
• Maximum operating temperature
• Flow medium
• Solids or sand content
• Required seal material
• Required material grade
• NACE requirement
• API Spec 7HU2 requirement
• Hydrostatic test requirement
• Third-party inspection requirement
• Required quantity
• Existing part number
• Existing drawing or photographs
• Destination country
• Delivery schedule

Request a Technical Quotation

Goldenman supplies threaded, butt-weld and H₂S-service Hammer Unions for drilling, cementing, fracturing, acidizing, well testing, flowback and production systems.

The complete range covers 1, 1-1/2, 2, 3 and 4-inch sizes, Fig 100 through Fig 2202 connections and rated working pressures from 1,000 to 20,000 psi.

Complete unions and replacement components are supplied with material traceability, dimensional inspection, NDE and hydrostatic test documentation.

Email: info@goldenman.com

FMC, Weco and SPM are trademarks of their respective owners. These names are used only to identify established dimensional and connection references and do not indicate OEM manufacture or affiliation.