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American Thread Identification Kit | Includes: Thread Pitch Gauge, Fitting Identification Cards, Vinyl Bag for identifying NPT, JIC, ORFS, O-Ring Boss, NPSM, and SAE 45
American Thread Identification Kit | Includes: Thread Pitch Gauge, Fitting Identification Cards, Vinyl Bag for identifying NPT, JIC, ORFS, O-Ring Boss, NPSM, and SAE 45
American Thread Identification Kit | Includes: Thread Pitch Gauge, Fitting Identification Cards, Vinyl Bag for identifying NPT, JIC, ORFS, O-Ring Boss, NPSM, and SAE 45
American Thread Identification Kit | Includes: Thread Pitch Gauge, Fitting Identification Cards, Vinyl Bag for identifying NPT, JIC, ORFS, O-Ring Boss, NPSM, and SAE 45
American Thread Identification Kit | Includes: Thread Pitch Gauge, Fitting Identification Cards, Vinyl Bag for identifying NPT, JIC, ORFS, O-Ring Boss, NPSM, and SAE 45
American Thread Identification Kit | Includes: Thread Pitch Gauge, Fitting Identification Cards, Vinyl Bag for identifying NPT, JIC, ORFS, O-Ring Boss, NPSM, and SAE 45
American Thread Identification Kit | Includes: Thread Pitch Gauge, Fitting Identification Cards, Vinyl Bag for identifying NPT, JIC, ORFS, O-Ring Boss, NPSM, and SAE 45

American Thread Identification Kit | Includes: Thread Pitch Gauge, Fitting Identification Cards, Vinyl Bag for identifying NPT, JIC, ORFS, O-Ring Boss, NPSM, and SAE 45

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$35.95
$35.95 - $35.95
$35.95
$29.95
$29.95 - $29.95
$29.95
  • Identifies six U.S. standards: NPT, NPSM, JIC, SAE 45°, ORFS, and O-Ring Boss.
  • Male and female ends: Cards check outside and inside diameters, with dash size, nominal size, and TPI charted on each card.
  • Thread pitch gauge: Reads 11 to 28 TPI plus 1.0, 1.5, and 2.0 mm metric pitch.
  • Angle gauges: 37°, 45°, 30°/60°, and 12°/24° for telling flares and cone seats apart.
  • Stays together: Cards and gauge store in a blue vinyl bag for the truck or the bench.
Specifications for Variant SKU: USA-HYD-KIT
American Thread Identification Kit: six identification cards, thread pitch gauge, and blue vinyl bag

Find out what an unmarked fitting is

This kit identifies six common U.S. hydraulic fitting standards: NPT, NPSM, JIC, SAE 45°, ORFS, and O-Ring Boss. Match the part to a card, find its size, then confirm the thread and seat angle with the gauge.

It works on male and female ends and packs into one vinyl bag for the service truck or the bench.

How to identify a fitting

Matching a fitting's shape to the correct identification card

1Match the shape

Compare the end of the fitting to the drawings and pick the card that matches. If it has a flare or cone seat, hold it against the angle gauges on the tool to confirm the angle.

Testing a fitting against a card to find its size

2Find the size

Test the part against the sizes on that card until you find the closest fit. The chart on the card gives you the dash size and nominal size.

Checking threads per inch with the thread pitch gauge

3Confirm the thread

Set the pitch gauge in the threads. When the teeth sit flush with no light showing between them, read the TPI and check it against the card's chart.

Checking the outside diameter of a male adapter

Male outside diameter

Checking the inside diameter of a female fitting

Female inside diameter

Thread pitch gauge reading threads on a fitting

Inside or outside threads

The six standards on the cards

Where a fitting seals is often the fastest way to narrow it down.

Standard Thread Seals on
NPT Tapered pipe The threads
NPSM Straight pipe 30° seat (60° included) in the female swivel
JIC Straight UN/UNF 37° flare
SAE 45° Straight UN/UNF 45° flare
ORFS Straight UN O-ring in the flat face
O-Ring Boss Straight UN/UNF O-ring at the base of the male thread

Fittings that are easy to mix up

Some of these standards share a thread, so a thread count alone won't settle it. Check these instead.

JIC or SAE 45°?

Several dash sizes use the same thread. Check the flare instead: JIC is 37° and SAE is 45°, and the gauge has a guide for each.

NPT or NPSM?

They share threads per inch and are close in diameter. NPT threads taper and seal on the threads. NPSM threads run straight, and the swivel seals on a 30° seat.

JIC or O-Ring Boss?

Male ends share the same UN/UNF thread sizes. A JIC male has a 37° flare on the nose. An ORB male has an O-ring at the base of the thread instead.

What's in the bag

Identification cards being pulled out of the blue vinyl storage bag

Six identification cards

One card per standard. Each has a chart of dash size, nominal size, and threads per inch for every size on the card.

Angle and thread pitch gauge

Reads 11, 11.5, 12, 14, 16, 18, 19, 20, 24, 27, and 28 TPI, plus 1.0, 1.5, and 2.0 mm metric pitch, on inside or outside threads.

Angle gauges for 37°, 45°, 30° (60° included), and 12° (24° included) seats. Also sold separately.

Blue vinyl bag

Holds the cards and gauge together so nothing goes missing between jobs.

Feature diagram of the thread gauge kit

Working on British or metric equipment?

The cards cover U.S. standards only. The gauge reads metric pitch, but to identify BSPP, BSPT, JIS, DIN, Komatsu, or Kobelco fittings, use the TGK-01 BSP and metric thread gauge kit.

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