Please log in here to access all benefits, including promotional discounts and faster checkouts.

JBO Thread Ring Gauge (NoGo) - BSP (G) - Right Hand - Tol. A - 3/8 x 19

SKU:JBO-500104

The JBO Thread Ring Gauge (NoGo) for BSP (G) threads is a precision tool designed to verify external threads on fittings and pipes. Sized for Right Hand use with Tol. A and a 3/8 x 19 specificatio... Read more ↓
Thread FormBSP (G)
Size3/8
Pitch19
Gauge TypeRing Gauge (NoGo)
View all specifications ↓
£83.11
Prices shown ex. VAT
5 days estimated lead time — subject to availability
View Other Sizes →
Free delivery over £50 ex VAT
Secure checkout
14-day returns
30+ years expertise
Klarna
Pay in 3 interest-free instalments. No extra cost if paid on time. 18+ only.
Learn more about Klarna
Speak to our team
01732 887334
Mon – Thurs 8:30 – 17:30 · Fri 8:30 – 16:30

Compatible certification

The ones our customers buy most.

Description

The JBO Thread Ring Gauge (NoGo) for BSP (G) threads is a precision tool designed to verify external threads on fittings and pipes. Sized for Right Hand use with Tol. A and a 3/8 x 19 specification, it is well suited for plumbers, engineers, machinists, and maintenance teams who need fast, reliable fit checks on the bench or in the field.

The NoGo design makes it easy to spot non-conforming threads, helping prevent leaks, cross-threading, and incorrect assemblies. Its compact ring form supports streamlined storage and on-site testing, delivering consistent results across jobs and batches.

  • NoGo verification design: Quickly identify non-conforming BSP (G) external threads during inspection, enabling fast pass/fail decisions and reducing rework.
  • Precisely dimensioned BSP (G) 3/8 x 19, Tol. A: Delivers consistent, repeatable measurements aligned with BSP standards, supporting reliable QA checks and supplier acceptance.
  • Ergonomic, durable construction: Knurled outer edge provides a secure grip in tight spaces, while a robust design withstands daily shop or field use.

Using this gauge helps streamline workflow, save time, and improve results by providing clear, repeatable verification of thread conformity, reducing installation errors and rework, and ensuring leak-free connections in critical plumbing and fluid-handling applications. The gauge’s straightforward go/no-go assessment fits smoothly into QC routines, tool audits, and assembly processes, giving teams confidence to move projects forward with consistent quality.

Part Numbers

Protool Part Number
JBO-500104
Brand
JBO
Category
Gauge
No downloads are attached to this product yet.
Need cutting data? Call 01732 887334 or email sales@protool-ltd.co.uk.
Delivery

Free UK mainland delivery on orders over £50 ex VAT. In-stock items ordered before 4:30pm are dispatched the same working day. Full delivery information.

Returns

14-day returns on unused stock items in original packaging. Special-order and bespoke tooling is non-returnable. Read our returns policy.

Technical Support

Over 30 years of machining experience behind the counter. Call 01732 887334, Mon–Thurs 8:30–17:30, Fri 8:30–16:30.

Trade Accounts

Credit accounts, contract pricing and scheduled call-off orders available for trade customers. Apply for an account.

What time are Protool open?

We are open Monday to Friday between 8:30am and 5pm.

Do you offer Free Next Day delivery?

Yes! We offer Free Next Day delivery via Royal Mail Tracked 24 on all orders over £50 ex VAT*. We also offer Free DPD Local Next Day delivery on all orders over £100 ex VAT*.

We also offer the following:

  • Royal Mail Tracked 24 — £5.90 (FREE on orders over £50 ex VAT*). Order before 4:30pm for next day delivery. No signature required.
  • DPD Local Next Day — £8.00 (FREE on orders over £100 ex VAT*). Standard next day delivery to UK mainland addresses.
  • Royal Mail Special Delivery — £12.50. Guaranteed delivery before 1pm the next working day.
  • DPD Saturday Delivery — £25.00. Must be ordered on Friday before 4pm. Pre-12pm delivery.

For delivery to Scottish Highlands & Islands, Northern Ireland, Republic of Ireland, or overseas locations, additional charges apply. Please see our delivery page for full details, or call us on 01732 887 334.

*T's & C's and exclusions apply. Please see our delivery page for more information on all our services.

Ask our technical team about this tool

Not sure if this is the right tool for your job? Ask us about speeds and feeds, material suitability, holders or alternatives — 30+ years of machining experience on the other end.

Prefer to talk? Call 01732 887334 — Mon–Thurs 8:30–17:30, Fri 8:30–16:30.

Full Range: JBO Thread Ring Gauges (NoGo) - BSP (G)

View full collection →

You are viewing JBO-500104. Click any other SKU to view its full details.

Product SKUSizePitchPriceStock Order
JBO-500066 1/1628£111.84 5 days
JBO-500083 1/828£58.90 5 days
JBO-500077 1/419£70.07 5 days
JBO-500104 Viewing3/819£83.11 5 days
JBO-500067 1/214£95.39 5 days
JBO-500112 5/814£115.14 5 days
JBO-500098 3/414£116.23 5 days
JBO-500117 7/814£150.21 5 days
JBO-500043 111£141.45 5 days
JBO-500063 1 1/811£169.96 5 days
JBO-500056 1 1/411£174.35 5 days
JBO-500052 1 1/211£196.27 5 days
JBO-500064 1 3/411£230.28 5 days
JBO-500087 211£239.05 5 days
JBO-500092 2 1/411£289.49 5 days
JBO-500090 2 1/211£326.75 5 days
JBO-500094 2 3/411£350.89 5 days
JBO-500096 311£379.41 5 days
JBO-500097 3 1/211£458.34 5 days
JBO-500110 411£531.81 5 days
JBO-540586 4 1/211£702.86 5 days
JBO-540587 511£804.85 5 days
JBO-505330 5 1/211£903.54 5 days
JBO-540590 611£1,005.50 5 days
JBO-500084 1/828£223.68 5 days
JBO-500078 1/419£259.88 5 days
JBO-500105 3/819£299.34 5 days
JBO-500068 1/214£270.84 5 days
JBO-500099 3/414£289.49 5 days
JBO-500044 111£321.28 5 days
JBO-503042 1 1/211£411.20 5 days
JBO-500086 1/828£79.07 5 days
JBO-500082 1/419£94.96 5 days
JBO-500076 1/214£126.10 5 days
JBO-500116 5/814£150.21 5 days
JBO-500103 3/414£155.70 5 days
JBO-505911 7/814£196.27 5 days
JBO-500050 111£182.03 5 days
JBO-506393 1 1/811£224.79 5 days
JBO-503056 1 1/411£228.09 5 days
JBO-505430 1 1/211£254.39 5 days
JBO-506394 1 3/411£299.34 5 days
JBO-505432 211£312.51 5 days
JBO-506395 2 1/411£377.19 5 days
JBO-505433 2 1/211£424.36 5 days
JBO-506396 2 3/411£458.34 5 days
JBO-506397 311£493.44 5 days

Other sizes in this range

with tools we think you'll like
All 47 →