TES-LOK Male Adapter Tube Fittings — double-ferrule compression tube one end, male external NPT / BSP / SAE thread other end. Connects instrument tubing directly to female-ported valves, transmitters, and manifolds. SS 316 · Brass · Monel · Inconel · Standard · SAE/MS Straight-Thread · Reducing · Up to 6,000 PSI · ISO 9001:2015 certified.
Male Adapter — NPT / BSP Series
SAE / MS Straight-Thread Male Adapter
A male adapter tube fitting (also called a male connector or tube-to-male-thread fitting) has two distinct ends: a double-ferrule compression tube end that grips the tube OD via PTFE front and back ferrules, and a male external thread end that screws into a female-threaded port on a valve, instrument, transmitter, or pipe fitting.
Male adapters are the standard termination point wherever a tubing run must connect to a female-ported device. They eliminate the need for separate compression unions and pipe nipples, keeping connections compact and leak-tight from factory first make-up.
| Variant | Thread Type | Seal Mechanism | Sealant Required | Typical Application |
|---|---|---|---|---|
| Standard Male Adapter (NPT) | NPT tapered (ASME B1.20.1) | Thread flanks taper-wedge | PTFE tape or anaerobic | Valves, gauges, pipe manifolds |
| Standard Male Adapter (BSPT) | BSPT R/Rc tapered (ISO 7-1) | Thread flanks taper-wedge | PTFE tape or sealant paste | UK / European process equipment |
| Male Adapter (BSPP / G) | BSPP G parallel (ISO 228-1) | Bonded seal (Dowty) face | Dowty washer — NOT PTFE tape | Hydraulic valves, European instruments |
| SAE / MS Straight-Thread | UNF straight (SAE J1926 / MS16142) | O-ring on male thread shank | None — O-ring only | Hydraulic systems, aerospace, analytical |
| Reducing Male Adapter | NPT / BSP / SAE — smaller than tube OD | As per thread type above | As per thread type | Large-bore tube to small-port equipment |
| Weld Male Adapter | Butt-weld or socket-weld socket | Weld seal | None (weld) | High-temp / high-pressure permanent connections |
| Thread Standard | Thread Profile | Seal Location | Correct Sealant | Do NOT Use |
|---|---|---|---|---|
| NPT (ASME B1.20.1) | Tapered 60° | Thread flanks | PTFE tape (2 wraps) or anaerobic | — |
| BSPT (ISO 7-1) | Tapered 55° | Thread flanks | PTFE tape or sealant paste | — |
| BSPP / G (ISO 228-1) | Parallel 55° | Bonded seal face | Dowty washer | PTFE tape |
| SAE / MS UNF (SAE J1926) | Straight 60° | O-ring on shank | None — O-ring seals | PTFE tape |
| TES-LOK Male Adapter Tube Fitting — Specifications | |
|---|---|
| Brand | TES-LOK (by Tesco Steel & Engineering) |
| Tube end | Double-ferrule compression (TES-LOK bite-type) — PTFE ferrules (ASTM D1710/D3294) |
| Thread end | Male external — NPT · BSPT · BSPP · SAE J1926 / MS16142 · UNF |
| Tube OD range | 1/8" – 1" (imperial) · 3 mm – 25 mm (metric) |
| Thread range | 1/8" NPT – 1" NPT and equivalent BSP / SAE |
| Configurations | Equal · Reducing · SAE/MS straight-thread · Weld |
| Body materials | SS 316 / 316L (standard) · SS 304 · Brass · Monel 400 · Inconel 625 · Hastelloy C-276 · Carbon Steel |
| Max. working pressure | 6,000 PSI (SS 316) · 3,000 PSI (Brass) |
| Temperature range | −196°C to +400°C (SS) · −29°C to +232°C (PTFE ferrule limit) |
| Standards | ASTM D1710 · ASTM D3294 · SAE J1926 · MS16142 |
| Certifications | ISO 9001:2015 · EN 10204 3.1 MTC available |
| Compatible systems | TES-LOK · Swagelok · Parker A-LOK · Ham-Let |
SAE/MS straight-thread male adapters are specified wherever vibration, repeated assembly, or leak-zero requirements rule out tapered thread connections. Key technical characteristics:
| Fitting | End 1 | End 2 | Choose When |
|---|---|---|---|
| Male Adapter | Compression tube | Male external thread | Equipment port is female (internal thread) |
| Female Adapter | Compression tube | Female internal socket | Equipment stud or nipple is male (external thread) |
| Male Bulkhead Connector | Compression tube (inside panel) | Male thread (outside panel) | Tube passes through panel; external connection is female |
| Tube Adapter (Reducing) | Compression tube (large OD) | Male thread (different size) | Changing tube OD and connecting to threaded port simultaneously |
| Male Run Tee | Compression tube × 2 (run) | Male thread (branch) | Side branch from tube run to female-ported instrument |
Replaces a compression union plus pipe nipple. Fewer joints means fewer potential leak points in the tubing system.
Inert to virtually all process fluids. No galling, no cold welding — tube can be removed and reconnected without damage to the tube OD surface.
NPT, BSPT, BSPP, SAE J1926, and metric UNF all stocked. No multi-vendor sourcing for international projects with mixed thread standards.
PTFE ferrule absorbs vibration without loosening. SAE/MS straight-thread variant rated for continuous vibration service.
Connect 1/2" OD tubing to a 1/4" NPT port in one fitting — no separate reducer bushing needed.
TES-LOK compression ends match Swagelok and Parker A-LOK dimensions — direct replacement for existing systems during maintenance or expansion.
▶ What is a male adapter tube fitting?
A male adapter tube fitting has a compression tube connection on one end and a male external thread (NPT, BSP, SAE, or UNF) on the other. It connects instrument tubing directly to female-ported valves, equipment, or manifolds without extra fittings.
▶ Should I use PTFE tape on a male adapter tube fitting?
Use PTFE tape on NPT and BSPT (tapered) threads — they seal on the thread flanks. Use a bonded seal (Dowty washer) on BSPP parallel threads. Never use PTFE tape on SAE/MS straight-thread adapters — those seal on the O-ring, and tape prevents proper seating.
▶ What is a SAE/MS straight-thread male adapter?
A SAE/MS straight-thread male adapter uses a UNF thread with an O-ring groove on the shank. The O-ring seals against the flat face of the female port — not the thread flanks — giving a leak-free, vibration-resistant connection with no thread sealants. Standards: SAE J1926 / MS16142.
▶ What materials are TES-LOK male adapters available in?
316/316L stainless steel, 304 SS, duplex 2205/2507, monel 400, inconel 625, hastelloy C-276, and carbon steel — covering all corrosion, pressure, and temperature requirements.
▶ What tube sizes are available?
TES-LOK male adapters are available in tube OD from 1/8" to 1" (imperial) and 3 mm to 25 mm (metric), with male thread sizes from 1/8 NPT to 1 NPT and equivalent BSP/SAE sizes.
▶ What is the pressure rating?
TES-LOK male adapter tube fittings in 316 SS are rated to 6,000 PSI at room temperature for standard tube sizes. Ratings reduce with temperature and larger tube diameters.
▶ Male adapter vs female adapter — which do I need?
A male adapter has a protruding external thread that screws into a female-ported equipment connection. A female adapter has an internal socket that accepts a male stud or nipple. Select based on the gender of the equipment port you are connecting to.
▶ Are TES-LOK male adapters compatible with Swagelok and Parker?
TES-LOK male adapter compression ends are dimensionally compatible with Swagelok and Parker A-LOK fittings of the same tube OD. Always verify compatibility before mixing brands in critical service.
NPT · BSPT · BSPP · SAE/MS straight-thread · Reducing · Weld — all in 316 SS, duplex, monel, inconel, and more. ISO 9001:2015 certified. Mill test reports supplied as standard.
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