High-Precision Threaded Fittings for Industrial Lubrication Systems
Product Overview
Professional-grade threaded adapters and extensions engineered for hydraulic, grease, and oil lubrication systems. These precision fittings solve two critical challenges: accessing hard-to-reach lubrication points and connecting incompatible components.
Manufactured to SAE J514 and ISO 8434 standards. Every fitting undergoes 100% inspection and pressure testing.
Primary Applications: Centralized lubrication systems | Progressive divider valves | Single/dual-line grease distribution | CNC machine tools | Mobile hydraulic equipment | Industrial gearbox maintenance
I. STRAIGHT EXTENSIONS
What They Do
Straight extensions relocate recessed or obstructed lubrication points to accessible positions. Male-to-female thread configuration adds length without changing thread type or size.
Typical Uses:
- Bringing deeply recessed grease zerks to equipment surfaces
- Spacing fittings away from heat sources or moving parts
- Relocating pressure gauges to visible locations
- Bypassing structural obstructions
NPT Thread Straight Extensions
| Part Number | Thread Size | Length | Hex Size | Working Pressure | Burst Pressure |
|---|---|---|---|---|---|
| SE-1825 | 1/8″ NPT | 25mm | 10mm | 3,000 PSI | 12,000 PSI |
| SE-1850 | 1/8″ NPT | 50mm | 10mm | 3,000 PSI | 12,000 PSI |
| SE-2525 | 1/4″ NPT | 25mm | 12mm | 5,000 PSI | 20,000 PSI |
| SE-2550 | 1/4″ NPT | 50mm | 12mm | 5,000 PSI | 20,000 PSI |
| SE-2575 | 1/4″ NPT | 75mm | 12mm | 5,000 PSI | 20,000 PSI |
| SE-25100 | 1/4″ NPT | 100mm | 12mm | 5,000 PSI | 20,000 PSI |
| SE-25150 | 1/4″ NPT | 150mm | 12mm | 5,000 PSI | 20,000 PSI |
| SE-3830 | 3/8″ NPT | 30mm | 16mm | 3,500 PSI | 14,000 PSI |
| SE-3860 | 3/8″ NPT | 60mm | 16mm | 3,500 PSI | 14,000 PSI |
| SE-5040 | 1/2″ NPT | 40mm | 22mm | 2,500 PSI | 10,000 PSI |
| SE-5080 | 1/2″ NPT | 80mm | 22mm | 2,500 PSI | 10,000 PSI |
Thread Standard: NPT per ANSI/ASME B1.20.1 (60° tapered threads, sealant required)
Metric Thread Straight Extensions
| Part Number | Thread Size | Length | Hex Size | Working Pressure | Material |
|---|---|---|---|---|---|
| SE-M1025 | M10x1.0 | 25mm | 12mm | 4,000 PSI | SS304 |
| SE-M1050 | M10x1.0 | 50mm | 12mm | 4,000 PSI | SS304 |
| SE-M1230 | M12x1.5 | 30mm | 14mm | 4,000 PSI | SS304 |
| SE-M1460 | M14x1.5 | 60mm | 17mm | 3,500 PSI | SS304 |
| SE-M1630 | M16x1.5 | 30mm | 19mm | 3,500 PSI | SS316 |
| SE-M1660 | M16x1.5 | 60mm | 19mm | 3,500 PSI | SS316 |
Thread Standard: ISO 261 parallel threads with O-ring seal per ISO 3601-1
II. ADAPTERS
What They Do
Adapters solve compatibility issues between components with different thread types, sizes, genders, or connection styles. Essential for integrating international equipment and field modifications.
Typical Uses:
- Connecting North American equipment (NPT) to European machinery (metric/BSPP)
- Converting between thread sizes for gauge/sensor installations
- Joining components with mismatched genders
- Interfacing threaded ports with compression or quick-connect systems
A. Thread Type Conversion Adapters
NPT to JIC 37° Flare
Best For: High-vibration environments (mobile equipment, compressors) where superior vibration resistance is required.
| Part Number | Configuration | NPT Size | JIC Size | Hex | Pressure | Material Options |
|---|---|---|---|---|---|---|
| AJ-0404 | NPT Male → JIC Female | 1/4″ | -4 (7/16-20) | 14mm | 5,000 PSI | CS, SS316 |
| AJ-0406 | NPT Male → JIC Female | 1/4″ | -6 (9/16-18) | 19mm | 5,000 PSI | CS, SS316 |
| AJ-0606 | NPT Male → JIC Female | 3/8″ | -6 (9/16-18) | 19mm | 5,000 PSI | CS, SS316 |
| AJ-0608 | NPT Male → JIC Female | 3/8″ | -8 (3/4-16) | 22mm | 4,500 PSI | CS, SS316 |
| AJ-0808 | NPT Male → JIC Female | 1/2″ | -8 (3/4-16) | 24mm | 4,000 PSI | CS, SS316 |
JIC Features: Metal-to-metal 37° cone seal (no sealant required) | SAE J514 standard | Reusable 5-10 cycles | Rated for 20G continuous vibration
NPT to BSPP (British/European Parallel)
Best For: Connecting North American systems to European, British, or Asian equipment.
| Part Number | Configuration | NPT Size | BSPP Size | Seal Method | Pressure |
|---|---|---|---|---|---|
| AB-0404 | NPT Male → BSPP Female | 1/4″ | G1/4″ | Bonded seal washer | 3,000 PSI |
| AB-0606 | NPT Male → BSPP Female | 3/8″ | G3/8″ | Bonded seal washer | 3,000 PSI |
| AB-0808 | NPT Male → BSPP Female | 1/2″ | G1/2″ | Bonded seal washer | 2,500 PSI |
| AB-F0404 | NPT Female → BSPP Male | 1/4″ | G1/4″ | O-ring on face | 3,000 PSI |
| AB-F0606 | NPT Female → BSPP Male | 3/8″ | G3/8″ | O-ring on face | 3,000 PSI |
CRITICAL: BSPP threads seal on face, NOT on threads. Bonded seal washer or O-ring is mandatory. Never use thread sealant on BSPP.
NPT to Metric (DIN/ISO)
Best For: Integrating German, Italian, Swiss, or Asian machinery with North American systems.
| Part Number | Configuration | NPT Size | Metric Size | Pressure |
|---|---|---|---|---|
| AM-0410 | NPT Male → Metric Female | 1/4″ | M10x1.0 | 4,000 PSI |
| AM-0412 | NPT Male → Metric Female | 1/4″ | M12x1.5 | 4,000 PSI |
| AM-0414 | NPT Male → Metric Female | 1/4″ | M14x1.5 | 3,500 PSI |
| AM-0616 | NPT Male → Metric Female | 3/8″ | M16x1.5 | 3,500 PSI |
| AM-0618 | NPT Male → Metric Female | 3/8″ | M18x1.5 | 3,000 PSI |
Seal Method: O-ring seal per ISO 3601-1
B. Thread Size Adapters (Reducers/Bushings)
Best For: Installing gauges/sensors in larger ports. NOT recommended in main flow paths due to pressure drop.
| Part Number | Input Thread | Output Thread | Hex | Pressure | Flow Cv |
|---|---|---|---|---|---|
| RB-0402 | 1/4″ NPT F | 1/8″ NPT M | 12mm | 3,000 PSI | 0.8 |
| RB-0604 | 3/8″ NPT F | 1/4″ NPT M | 17mm | 3,000 PSI | 1.5 |
| RB-0806 | 1/2″ NPT F | 3/8″ NPT M | 22mm | 2,500 PSI | 2.8 |
| RB-0804 | 1/2″ NPT F | 1/4″ NPT M | 22mm | 2,500 PSI | 1.2 |
Flow Cv: Flow rate (GPM) at 1 PSI pressure drop
C. Gender-Changing Adapters
Male-to-Male Hex Nipples
Use: Connecting two female ports or couplings.
| Part Number | Thread Size | Length | Hex | Pressure |
|---|---|---|---|---|
| HN-2530 | 1/4″ NPT | 30mm | 12mm | 5,000 PSI |
| HN-2550 | 1/4″ NPT | 50mm | 12mm | 5,000 PSI |
| HN-2575 | 1/4″ NPT | 75mm | 12mm | 5,000 PSI |
| HN-3840 | 3/8″ NPT | 40mm | 19mm | 3,500 PSI |
| HN-5050 | 1/2″ NPT | 50mm | 22mm | 2,500 PSI |
Female-to-Female Couplings
Use: Joining two male-threaded components.
| Part Number | Thread Size | Length | Hex | Pressure |
|---|---|---|---|---|
| FC-2535 | 1/4″ NPT | 35mm | 19mm | 5,000 PSI |
| FC-3842 | 3/8″ NPT | 42mm | 24mm | 3,500 PSI |
| FC-5050 | 1/2″ NPT | 50mm | 30mm | 2,500 PSI |
D. Connection Style Adapters
NPT to Compression Fitting
Best For: Interfacing rigid tube systems (copper, stainless, nylon) with threaded ports.
| Part Number | NPT Size | Tube OD | Ferrule Type | Pressure | Material |
|---|---|---|---|---|---|
| CN-0406 | 1/4″ NPT M | 6mm | Single | 2,500 PSI | Brass/SS304 |
| CN-0410D | 1/4″ NPT M | 10mm | Double | 5,000 PSI | SS316 |
| CN-0610D | 3/8″ NPT M | 10mm | Double | 5,000 PSI | SS316 |
| CN-0612D | 3/8″ NPT M | 12mm | Double | 4,500 PSI | SS316 |
Double Ferrule: Superior vibration resistance, reusable 5+ times
NPT to Push-to-Connect
Best For: Low-pressure oil mist, compressed air, instrumentation lines.
| Part Number | NPT Size | Tube OD | Max Pressure | Temp Range |
|---|---|---|---|---|
| PT-0406 | 1/4″ NPT M | 6mm | 150 PSI | -20°C to +80°C |
| PT-0408 | 1/4″ NPT M | 8mm | 200 PSI | -20°C to +80°C |
| PT-0610 | 3/8″ NPT M | 10mm | 200 PSI | -20°C to +80°C |
Not Suitable: High-pressure grease or hydraulic systems
III. MATERIAL SELECTION GUIDE
Carbon Steel (Zinc-Plated) – Standard
| Property | Specification |
|---|---|
| Base Material | AISI 12L14 per ASTM A576 |
| Plating | Zinc-chromate (5-8μm, RoHS compliant) |
| Tensile Strength | 60,000 PSI minimum |
| Temperature Range | -29°C to +150°C |
| Salt Spray Resistance | 96+ hours (ASTM B117) |
Best For: Indoor installations | Petroleum oils/greases | Mineral hydraulic fluids | Cost-effective applications
Compatible: ISO VG 32-680 petroleum oils, NLGI 0-2 greases, ISO 11158 mineral hydraulic fluids
Stainless Steel 304 – Food/Pharma Grade
| Property | Specification |
|---|---|
| Grade | ASTM A276 Type 304 (18% Cr, 8% Ni) |
| Tensile Strength | 75,000 PSI minimum |
| Temperature Range | -196°C to +425°C |
| Surface | Passivated per ASTM A967 |
Best For: Food/beverage processing | Pharmaceutical | Cleanroom | Synthetic lubricants | High temperature
Compatible: All petroleum oils, PAO synthetics, ester-based fluids, NSF H1 food-grade lubricants
Stainless Steel 316 – Marine/Chemical Grade
| Property | Specification |
|---|---|
| Grade | ASTM A276 Type 316 (16-18% Cr, 10-14% Ni, 2-3% Mo) |
| Pitting Resistance | PREN ~24 (superior to 304) |
| Temperature Range | -196°C to +425°C |
Best For: Marine vessels | Offshore platforms | Coastal facilities | Chemical plants | Chloride-rich environments
Key Advantage: Molybdenum provides exceptional resistance to chlorides, acids, and aggressive chemicals
Brass (C36000) – Low-Pressure Applications
| Property | Specification |
|---|---|
| Composition | 61-63% Cu, 35-37% Zn |
| Max Pressure | 1,000-1,500 PSI |
| Temperature Range | -50°C to +120°C |
Best For: Compressed air | Low-pressure oil (<500 PSI) | Gauge connections
Not For: High-pressure grease systems, ammonia-containing lubricants
Material Selection Quick Reference
| Application | Recommended Material |
|---|---|
| Indoor petroleum systems | Carbon Steel (Zinc) |
| Food/pharmaceutical | SS304 |
| Marine/offshore/coastal | SS316 |
| Chemical plants | SS316 |
| High temperature (>150°C) | SS304 or SS316 |
| Low-pressure air | Brass |
IV. SYSTEM COMPATIBILITY GUIDE
Pressure Rating by System Type
Match your lubrication system to the correct fitting pressure rating (4:1 safety factor per ASME B31.3):
| Lubrication System Type | Operating Pressure | Minimum Fitting WP | Recommended Size |
|---|---|---|---|
| Oil mist systems | 5-15 PSI | 500 PSI | Any size |
| Single-line oil circulation | 50-150 PSI | 1,000 PSI | 1/8″ or larger |
| Progressive oil dividers | 150-500 PSI | 2,000 PSI | 1/4″ or larger |
| Single-line grease | 1,000-2,500 PSI | 5,000 PSI | 1/4″ NPT standard |
| Progressive grease dividers | 2,000-3,500 PSI | 10,000 PSI | 1/4″ NPT |
| Dual-line grease | 3,000-5,000 PSI | 15,000 PSI | Custom high-pressure |
Temperature Derating
Reduce working pressure at elevated temperatures:
| Temperature | Carbon Steel | SS304/SS316 |
|---|---|---|
| 20°C (68°F) | 1.00× (full rating) | 1.00× (full rating) |
| 100°C (212°F) | 0.90× | 0.95× |
| 150°C (302°F) | 0.75× | 0.90× |
| 200°C (392°F) | 0.60× | 0.85× |
Example: 1/4″ NPT extension (5,000 PSI rated), carbon steel, at 150°C = 5,000 × 0.75 = 3,750 PSI max
V. VIBRATION RESISTANCE GUIDE
Application Environment Classification
| Vibration Level | Frequency | Example Applications |
|---|---|---|
| Low | <5 Hz | Stationary gear reducers, low-speed pumps |
| Medium | 5-15 Hz | Electric motor pumps, conveyors |
| High | 15-30 Hz | Excavators, loaders, reciprocating compressors |
| Severe | 30-100 Hz | Impact tools, mining vehicles, jackhammers |
Recommended Solution by Environment
| Environment | Standard NPT | Recommended Solution |
|---|---|---|
| Low vibration | ✓ PTFE tape | Standard NPT acceptable |
| Medium vibration | ✓ Add Loctite 243 | NPT with threadlocker |
| High vibration | ○ With periodic inspection | JIC 37° flare preferred |
| Severe vibration | ✗ Not recommended | JIC 37° flare mandatory |
JIC Advantage: Metal-to-metal cone seal provides 20-100× longer service life in high-vibration applications vs. standard NPT
VI. INSTALLATION & ORDERING
Basic Installation Requirements
NPT Threads: PTFE tape (3-4 wraps) or anaerobic sealant required | Torque to specification
BSPP Threads: Bonded seal washer or O-ring on face required | NO thread sealant | Must bottom on sealing surface
JIC 37° Flare: No sealant required | Torque to specification only
Detailed installation procedures, torque specifications, and troubleshooting available in downloadable technical manual.
Part Number Format
Example: SE-SS304-2550
- SE = Straight Extension
- SS304 = Stainless Steel 304
- 25 = 1/4″ thread
- 50 = 50mm length
Material Codes
| Code | Material |
|---|---|
| (No suffix) | Carbon Steel, Zinc-Plated |
| -SS304 | Stainless Steel 304 |
| -SS316 | Stainless Steel 316 |
| -BR | Brass |
FAQ — External Lubrication Adapter
What is an external lubrication adapter and when is it used?
An external lubrication adapter is a threaded connector or extension that lets you attach a grease gun, pump, or lubrication line to hard-to-reach or differently threaded grease points; it is used when original fittings are inaccessible, damaged, or use a different thread standard.
What thread types and materials are available?
Common thread types include NPT, JIC, UNF/UNS and metric, and materials typically include stainless steel (SS304/316) and carbon steel to meet strength and corrosion requirements.
What pressure ratings should I consider?
Choose an adapter with a pressure rating equal to or higher than your system’s maximum operating pressure; industrial adapters are commonly rated for several thousand PSI depending on design and material.
How do I install an adapter correctly?
Clean both mating threads, hand-start the adapter to avoid cross-threading, apply the proper thread sealant or tape if required, then tighten to the manufacturer’s recommended torque without over-stressing the fitting.
Can adapters reach blocked or damaged grease fittings?
Yes—90° adapters, angled couplers, and extension adapters can reach obstructed or awkward fittings, and some specialty tips allow greasing where fittings are damaged, though severely damaged ports may need repair first.
How do I choose between straight and angled adapters?
Use straight extensions when you only need extra length; choose 90° or angled adapters when access is obstructed or the fitting orientation prevents a straight approach, prioritizing access without bending or stressing the fitting.
Are there compatibility tips for grease guns and pumps?
Match thread size and coupling style (quick-connect, ball-retention, etc.) to your grease gun or pump, confirm the adapter’s pressure and material compatibility with your grease type, and check retention features for secure connections.
How should I maintain and inspect adapters?
Inspect regularly for thread wear, corrosion, leaks, and mechanical damage; keep mating surfaces clean, replace damaged adapters, and periodically test under normal pressure to verify seals.
What common mistakes should I avoid?
Avoid cross-threading by hand-starting, using incorrect sealants for the thread type, over-torquing, and forcing mismatched threads—these actions can cause leaks or permanent damage.
Where can I find the correct adapter for my system?
Refer to your lubrication supplier’s product pages or catalogs for selection tables and part numbers that list thread types, materials, lengths, and pressure ratings to match your existing fittings and system needs.
QUALITY ASSURANCE & SUPPORT
Quality Standards
- ISO 9001:2015 certified manufacturing
- 100% pressure tested to 1.5× working pressure
- Full traceability – Mill test reports available
- RoHS/REACH compliant materials
Available Documentation
- Material certificates (included)
- Pressure test certificates (included)
- Installation manual (PDF download)
- Engineering datasheet (PDF download)
Technical Support
- Thread identification service
- System design consultation
- Material selection guidance
- Custom adapter design available
Contact: Technical support available for application assistance | Email response within 24 hours
Warranty: Manufacturing defects covered | Designed for 10+ year service life in specified applications
Related lubrication resources
Industrial lubrication systems · Automatic lubrication · Lubrication accessories
Before you buy: read our grease fitting types guide.
