Thread Gages & Thread Measurement
Insize Thread Gages & Thread Measurement
Authorized Insize distributor | Ships direct from Insize | Quote reply same dayInsize thread gages for accepting or rejecting threaded parts: GO and NO GO ring gages for external threads and plug gages for internal threads in metric, American (UN), NPT, BSPT and G-series pipe threads, plus 3-wires, screw thread micrometer tips and thread measuring instruments.
Choosing between options
| If you need to… | Choose | Example |
|---|---|---|
| Check an external thread | GO ring plus the matching NO GO ring | 4120-36 |
| Check an internal thread | Thread plug gage | 4130-36 |
| Measure pitch diameter with a micrometer | 3-wires sized to the pitch | 7382-24 |
Before you order
- GO and NO GO rings are separate part numbers (NO GO ends in N); order both to check a thread fully.
- For 60° threads the best wire diameter is 0.57735 × pitch; pick the 3-wire size for your pitch.
- Ships direct from Insize. Most items are in stock; we confirm your ship date by email after you order.
← All Precision Measuring categories
Need help choosing or a volume price?
Send thread size, pitch, class and GO / NO GO and the quantity — we reply the same day. (210) 494-1997 · sales@ldewitt.net
Request a QuoteSend thread size, pitch, class and GO / NO GO and the quantity — we reply the same day. (210) 494-1997 · sales@ldewitt.net
-
Insize 4121-3B1 – American Standard Thread Ring Gage, Go, 3/4-10UNC
Insize
$169.00Insize 4121-3B1 – American Standard4121-3B1- SKU:
- 4121-3B1
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.51 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-3B1
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359330
- Package Weight:
- 0.51 lb
- Package Length:
- 3.07 in
- Package Width:
- 2.95 in
- Package Height:
- 1.18 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$169.00 -
Insize 4121-3B1N – American Standard Thread Ring Gage, No Go, 3/4-10UNC
Insize
$116.00Insize 4121-3B1N – American Standar4121-3B1N- SKU:
- 4121-3B1N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.30 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-3B1N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359422
- Package Weight:
- 0.3 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.09 in
- Package Height:
- 0.98 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$116.00 -
Insize 4121-3B2 – American Standard Thread Ring Gage, Go, 3/4-16UNF
Insize
$169.00Insize 4121-3B2 – American Standard4121-3B2- SKU:
- 4121-3B2
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.41 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-3B2
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359347
- Package Weight:
- 0.41 lb
- Package Length:
- 3.07 in
- Package Width:
- 2.95 in
- Package Height:
- 1.18 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$169.00 -
Insize 4121-3B2N – American Standard Thread Ring Gage, No Go, 3/4-16UNF
Insize
$116.00Insize 4121-3B2N – American Standar4121-3B2N- SKU:
- 4121-3B2N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.25 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-3B2N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359439
- Package Weight:
- 0.25 lb
- Package Length:
- 2.17 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$116.00 -
Insize 4121-3C1 – American Standard Thread Ring Gage, Go, 3/8-16UNC
Insize
$101.00Insize 4121-3C1 – American Standard4121-3C1- SKU:
- 4121-3C1
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.18 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-3C1
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359163
- Package Weight:
- 0.18 lb
- Package Length:
- 2.17 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$101.00 -
Insize 4121-3C1N – American Standard Thread Ring Gage, No Go, 3/8-16UNC
Insize
$74.20Insize 4121-3C1N – American Standar4121-3C1N- SKU:
- 4121-3C1N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.13 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-3C1N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359255
- Package Weight:
- 0.13 lb
- Package Length:
- 2.17 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$74.20 -
Insize 4121-3C2 – American Standard Thread Ring Gage, Go, 3/8-24UNF
Insize
$114.00Insize 4121-3C2 – American Standard4121-3C2- SKU:
- 4121-3C2
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.14 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-3C2
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359262
- Package Weight:
- 0.14 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.09 in
- Package Height:
- 0.98 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$114.00 -
Insize 4121-3C2N – American Standard Thread Ring Gage, No Go, 3/8-24UNF
Insize
$93.80Insize 4121-3C2N – American Standar4121-3C2N- SKU:
- 4121-3C2N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.11 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-3C2N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359354
- Package Weight:
- 0.11 lb
- Package Length:
- 2.17 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$93.80 -
Insize 4121-41 – American Standard Thread Ring Gage, Go, 4-40UNC
Insize
$125.00Insize 4121-41 – American Standard4121-41- SKU:
- 4121-41
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.06 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-41
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359088
- Package Weight:
- 0.06 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$125.00 -
Insize 4121-41N – American Standard Thread Ring Gage, No Go, 4-40UNC
Insize
$87.30Insize 4121-41N – American Standard4121-41N- SKU:
- 4121-41N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.06 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-41N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359170
- Package Weight:
- 0.06 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$87.30 -
Insize 4121-5C1 – American Standard Thread Ring Gage, Go, 5/8-11UNC
Insize
$165.00Insize 4121-5C1 – American Standard4121-5C1- SKU:
- 4121-5C1
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.40 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-5C1
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359316
- Package Weight:
- 0.4 lb
- Package Length:
- 3.07 in
- Package Width:
- 2.95 in
- Package Height:
- 1.18 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$165.00 -
Insize 4121-5C1N – American Standard Thread Ring Gage, No Go, 5/8-11UNC
Insize
$114.00Insize 4121-5C1N – American Standar4121-5C1N- SKU:
- 4121-5C1N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.24 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-5C1N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359408
- Package Weight:
- 0.24 lb
- Package Length:
- 2.17 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$114.00 -
Insize 4121-5C2 – American Standard Thread Ring Gage, Go, 5/8-18UNF
Insize
$123.00Insize 4121-5C2 – American Standard4121-5C2- SKU:
- 4121-5C2
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.26 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-5C2
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359323
- Package Weight:
- 0.26 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.13 in
- Package Height:
- 0.87 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$123.00 -
Insize 4121-5C2N – American Standard Thread Ring Gage, No Go, 5/8-18UNF
Insize
$86.60Insize 4121-5C2N – American Standar4121-5C2N- SKU:
- 4121-5C2N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.16 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-5C2N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359415
- Package Weight:
- 0.16 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.13 in
- Package Height:
- 0.87 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$86.60 -
Insize 4121-5D1 – American Standard Thread Ring Gage, Go, 5/16-18UNC
Insize
$101.00Insize 4121-5D1 – American Standard4121-5D1- SKU:
- 4121-5D1
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.18 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-5D1
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359149
- Package Weight:
- 0.18 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$101.00 -
Insize 4121-5D1N – American Standard Thread Ring Gage, No Go, 5/16-18UNC
Insize
$76.20Insize 4121-5D1N – American Standar4121-5D1N- SKU:
- 4121-5D1N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.14 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-5D1N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359231
- Package Weight:
- 0.14 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$76.20 -
Insize 4121-5D2 – American Standard Thread Ring Gage, Go, 5/16-24UNF
Insize
$101.00Insize 4121-5D2 – American Standard4121-5D2- SKU:
- 4121-5D2
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.13 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-5D2
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359156
- Package Weight:
- 0.13 lb
- Package Length:
- 2.17 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$101.00 -
Insize 4121-5D2N – American Standard Thread Ring Gage, No Go, 5/16-24UNF
Insize
$74.20Insize 4121-5D2N – American Standar4121-5D2N- SKU:
- 4121-5D2N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.11 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-5D2N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359248
- Package Weight:
- 0.11 lb
- Package Length:
- 2.17 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$74.20 -
Insize 4121-61 – American Standard Thread Ring Gage, Go, 6-32UNC
Insize
$112.00Insize 4121-61 – American Standard4121-61- SKU:
- 4121-61
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.06 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-61
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359095
- Package Weight:
- 0.06 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- GO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$112.00 -
Insize 4121-61N – American Standard Thread Ring Gage, No Go, 6-32UNC
Insize
$81.20Insize 4121-61N – American Standard4121-61N- SKU:
- 4121-61N
- Availability:
- Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
- Weight:
- 0.06 LBS
- Brand:
- Insize
- Manufacturer Part Number:
- 4121-61N
- Product Family:
- Gages and Reference Tools
- Supplier Category Code:
- A
- EAN:
- 6928640359187
- Package Weight:
- 0.06 lb
- Package Length:
- 2.2 in
- Package Width:
- 2.09 in
- Package Height:
- 0.91 in
- Feature 1:
- Class 2A.
- Feature 2:
- NOGO Side
- Feature 3:
- Standard ANSI/ASME B1.2
- Feature 4:
- Supplied with manufacturer inspection certificate.
$81.20
