Englishहिंदी Both languages in one book · हिंदी और इंग्लिश दोनों में
Identify any hydraulic fitting thread in five measured steps.
हाइड्रोलिक थ्रेड की पहचान · English + हिंदी
A bilingual field guide by Padma Lochan Majhi, a hydraulic and mechanical maintenance manager with 16 years in heavy industry. It shows you how to read a fitting with a vernier caliper, a pitch gauge and an angle gauge, then confirm the exact size in reference tables.
- One repeatable 5-step method. Clean and look, diameter, pitch, taper and flank angle, then seat type.
- Reference tables for 7 thread families. BSPP, BSPT, NPT, JIC 37°, ORFS, Metric DIN 24° and SAE Flange Code 61/62, with OD and ID in mm.
- Look-alikes called out. Pitches and seats that are easy to confuse, like BSPT vs NPT and JIC 37° vs SAE 45°.
- Every instruction in English and Hindi. Technical terms such as OD, TPI and JIC stay in English, as they appear on gauges and catalogues.
A4 PDF · 20 pages · EN / हिं
Five readings. One row in the chart.
The record sheet from Chapter 3, filled in for a real fitting.
- Male / Female
- Male
- OD
- 20.8 mm
- Pitch
- 14 TPI (W)
- Form
- Parallel
- Flank
- 55°
- Seat
- 60° cone
- Result
- 1/2″ BSPP · dash -8
One book, two languages एक किताब, दो भाषाएँ
Every instruction in the book is written twice, first in English and then in Hindi. Read whichever line is easier for you. Both say the same thing.
यह किताब हिंदी और इंग्लिश दोनों में है। हर निर्देश दो बार लिखा है, जो भाषा आसान लगे वही पढ़ें। पूरी टीम एक ही किताब से सीख सकती है।
Sample from Step 3 · Measure pitch
Press one leaf into the thread along its length, covering at least 6–8 threads. Hold it against a light.
एक पत्ती को थ्रेड की लंबाई में दबाकर रखें, कम से कम 6–8 थ्रेड ढकें। रोशनी के सामने देखें।
Technical words such as OD, ID, TPI, BSP and JIC stay in English in both languages, the way they are printed on gauges, catalogues and fittings.
A caliper reading alone will order the wrong fitting.
Hydraulic threads from different standards share almost the same diameters. Guess from one number and the replacement screws in a few turns, then leaks or strips.
Three threads inside 0.9 mm
| Thread | Male OD | Pitch | Seat |
|---|---|---|---|
| Metric DIN M26×1.5 | 26.0 mm | 1.5 mm | 24° cone |
| 3/4″ BSPP | 26.4 mm | 14 TPI | 60° cone |
| JIC 1-1/16″ | 26.9 mm | 12 UN | 37° flare |
Values from the book's reference tables. Only the pitch and the seat tell these apart.
- 55° and 60° threads look the same at a glance.1/2″ and 3/4″ BSPT and NPT both have 14 TPI and almost the same OD. Without the flank angle you cannot tell them apart.
- The wrong pitch leaf can look right.A 1.5 mm leaf can sit on a 16 TPI thread for 2–3 threads and only drift out over 8.
- Same thread, different seat.JIC 37° and SAE 45° flares, or a 24° DIN cone and a 60° BSP cone, can share threads but leak when mixed.
- Used threads measure small.Worn threads read 0.1–0.3 mm under the table value, enough to push you to the wrong row.
Take five readings in a fixed order and write each one down. Together they point to one row in the quick decision chart. Then the family's reference table gives you the exact size from the measured OD or ID.
From the tools in your bag to the exact size code.
The full contents of the book, in the order you read them.
Foundations
- 01Tools you needज़रूरी औज़ार
Vernier caliper (0.02 or 0.05 mm least count), inch and metric pitch gauges, angle and seat gauges.
- 02Thread wordsथ्रेड की भाषा
OD, ID, pitch, TPI, flank angle, taper, seat and dash size, with TPI = 25.4 ÷ pitch.
- 03The 5-step method5 स्टेप का तरीका
The record sheet, and why a single reading is never enough.
Measure
- 04Clean and lookसाफ़ करें और देखें
Release pressure, clean, note male or female, seat style and damage.
- 05Diameter with a vernierवर्नियर से व्यास नापें
Outer jaws for male OD, inner jaws for female ID, and allowing for wear.
- 06Pitch with a pitch gaugeपिच गेज से पिच नापें
The light-gap test over 6–8 threads, plus a look-alike pitch table.
Classify
- 07Taper and flank angleटेपर और फ्लैंक एंगल
D1 vs D2 for taper; 55° Whitworth vs 60° Unified and metric.
- 08Seat type with an angle gaugeएंगल गेज से सीट पहचानें
37° flare, 60° cone, 24° cone, ORFS flat face, ORB and thread-sealing types.
- 09Quick decision chartफटाफट पहचान चार्ट
Pitch, flank, taper and seat read across to the thread family.
Look up & apply
- 10Reference tablesसंदर्भ टेबल
Dash size, TPI, male OD, female ID and hex for each family, plus SAE flange dimensions.
- 11Worked examplesहल किए गए उदाहरण
A pump fitting, an excavator hose end and a steel-pipe nut, solved step by step.
- 12Mistakes to avoid & safetyआम गलतियाँ और सुरक्षा
Pressure, mixing angles, PTFE tape, O-rings and over-tightening.
Thread and connection types covered
- BSPP 55° · parallel
- BSPT 55° · taper
- NPT / NPTF 60° · taper
- JIC 37° UNF / UN
- ORFS flat face
- ORB O-ring boss
- SAE 45° flare
- Metric DIN 24° L · S · LL
- SAE Flange Code 61 · 62
Keep it on your phone at the machine. The method, the decision chart and the tables in one 20-page PDF.
What you'll be able to do after studying it
Use outer jaws on male crests and inner jaws on female crests, take the biggest of 2–3 readings, and match it to the table.
Use both gauge sets and the light-gap test, and convert with 25.4 ÷ pitch.
Read crest shape and flank angle, including the BSPT vs NPT case at 1/2″ and 3/4″.
Compare D1 at the first full thread with D2 at the last.
Recognise six seat styles and check cones and flares with an angle gauge.
Use the tube OD, since the thread alone does not decide it.
Measure the long hole spacing and check it against the dimension tables.
Convert 1/16-inch dash codes to inches, and match chart codes to SAE dash numbers.
What the book does and doesn't promise
It teaches a measuring and identification method. Your results depend on clean parts, careful readings and gauges in good condition. Values come from a hydraulic thread reference chart, and the book itself advises confirming sizes in the fitting manufacturer's catalogue for critical or high-pressure work.
Written for the people who handle the fitting
- Maintenance fitters and techniciansIdentify a failed hose end or adapter on the machine before ordering the replacement.
- Hose assembly and workshop staffConfirm thread, seat and dash size before crimping or fitting an end.
- Stores, spares and purchase teamsTurn a part in hand into a correct size description using the reference tables.
- Apprentices, trainees and studentsLearn thread vocabulary and a measuring routine with diagrams and worked examples.
- Supervisors and trainersUse one shared method and record sheet across a team, in English or Hindi.
This eBook is for you if…
- You have a vernier and a pitch gauge but aren't sure which reading decides what.
- You've had a "correct size" fitting leak because the seat or flank was different.
- You work with BSP, JIC, ORFS and metric DIN fittings on the same machines.
- You or your team prefer instructions in Hindi alongside English. हिंदी में भी पढ़ना चाहते हैं।
- You want the size tables in one place instead of several catalogues.
Real pages from the book
Four of the twenty pages. Tap a page to read it full size.
Page numbers follow the book's printed numbering.
What's included
| Product | Hydraulic Thread Identification (हाइड्रोलिक थ्रेड की पहचान) |
|---|---|
| Author | Padma Lochan Majhi |
| Format | Digital eBook, PDF file |
| Length | 20 pages, A4 |
| Languages | English and Hindi, every instruction in both (हिंदी और इंग्लिश दोनों में) |
| Delivery | Instant download link after payment is done |
- 12 chapters covering tools, terms, the 5-step method and safety
- Reference tables: BSPP, BSPT, NPT vs BSPT, JIC 37°, ORFS, Metric DIN 24° (L/S) and SAE Flange Code 61 and 62 dimensions
- Quick decision chart from pitch, flank, taper and seat to thread family
- Cross-section drawings and gauge diagrams
- 3 worked examples and a mistakes-and-safety checklist
- Not included: printed copy or measuring tools
Written by a maintenance manager, for the people on the shop floor
Everything counted, nothing inflated
Frequently asked questions
What is this eBook about?
It teaches you to identify hydraulic fitting threads and connections with a vernier caliper, a pitch gauge and an angle gauge. You take five readings, find the thread family in a decision chart, then read the exact size from a reference table.
Who should read it?
Maintenance technicians, fitters, hose assembly staff, spares and purchase teams, trainees and anyone who has to identify a hydraulic fitting before replacing it.
What topics does it cover?
Tools, thread terms, the 5-step method (clean and look, diameter, pitch, taper and flank, seat), a quick decision chart, reference tables for BSPP, BSPT, NPT, JIC 37°, ORFS, Metric DIN 24° and SAE Flange Code 61/62, worked examples, and common mistakes and safety.
Is it in English or Hindi?
Both. Every instruction is written in English and in Hindi. Technical terms such as OD, ID, TPI, BSP and JIC stay in English in both, as they appear on gauges and catalogues.
Is this a digital product?
Yes. It is a 20-page PDF eBook. Nothing is shipped.
How will I receive the eBook after payment?
As soon as your payment is done, you get a download link for the PDF. If the link doesn't appear, email apsflowtech@gmail.com or WhatsApp +91 93370 75555 with your payment reference.
Can I read it on a mobile phone or computer?
It is a standard PDF, so it opens in any PDF reader on phones, tablets and computers. The pages are A4, so on a small phone screen you may need to zoom into the tables.
Do I need special tools?
The method uses a vernier caliper (0.02 or 0.05 mm least count), inch and metric pitch gauges, and a thread-angle or seat-angle gauge. A wire brush, cloth and a torch also help. Tools are not included.
Can I get a refund?
Because the eBook is delivered instantly, purchases are generally non-refundable. You get a full refund for a duplicate payment, if the eBook can't be delivered, or if the file is faulty and can't be replaced. Ask within 7 days of purchase. Details are in the Refund Policy.
What should I do if I have a payment or download problem?
Email apsflowtech@gmail.com or call / WhatsApp +91 93370 75555. Please include your payment reference so the order can be found. More help is on the Contact page.
Englishहिंदी Both languages in one book
Measure it, check it, name it. Then order the right fitting.
The 5-step method, the quick decision chart and the reference tables for BSPP, BSPT, NPT, JIC, ORFS, DIN 24° and SAE flanges, in English and Hindi, in one 20-page PDF.