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Thread Gages & Thread Measurement

Thread Gages & Thread Measurement

Insize Thread Gages & Thread Measurement

Authorized Insize distributor  |  Ships direct from Insize  |  Quote reply same day

Insize 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…ChooseExample
Check an external threadGO ring plus the matching NO GO ring4120-36
Check an internal threadThread plug gage4130-36
Measure pitch diameter with a micrometer3-wires sized to the pitch7382-24

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 Quote
  • Insize 4120-60N precision measuring tool
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    Insize 4120-60N – Metric Thread Ring Gage, No Go, M60x5.5

    Insize

    $357.00
    Insize 4120-60N – Metric Thread Rin
    4120-60N
    SKU:
    4120-60N
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    3.77 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4120-60N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341953
    Package Weight:
    3.77 lb
    Package Length:
    7.17 in
    Package Width:
    7.17 in
    Package Height:
    2.44 in
    Feature 1:
    Go and No-Go gages are supplied separately.
    Feature 2:
    Class 6g.
    Feature 3:
    Standard ISO1502.
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $357.00
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  • Insize 4120-6N precision measuring tool
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    Insize 4120-6N – Metric Thread Ring Gage, No Go, M6x1

    Insize

    $63.70
    Insize 4120-6N – Metric Thread Ring
    4120-6N
    SKU:
    4120-6N
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.12 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4120-6N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341724
    Package Weight:
    0.12 lb
    Package Length:
    1.57 in
    Package Width:
    1.57 in
    Package Height:
    0.59 in
    Feature 1:
    Go and No-Go gages are supplied separately.
    Feature 2:
    Class 6g.
    Feature 3:
    Standard ISO1502.
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $63.70
    Add to Cart Quick view
  • Insize 4120-7 precision measuring tool
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    Insize 4120-7 – Metric Thread Ring Gage, Go, M7x1

    Insize

    $71.00
    Insize 4120-7 – Metric Thread Ring
    4120-7
    SKU:
    4120-7
    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:
    4120-7
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341427
    Package Weight:
    0.11 lb
    Package Length:
    1.69 in
    Package Width:
    1.61 in
    Package Height:
    0.59 in
    Feature 1:
    Go and No-Go gages are supplied separately.
    Feature 2:
    Class 6g.
    Feature 3:
    Standard ISO1502.
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $71.00
    Add to Cart Quick view
  • Insize 4120-7N precision measuring tool
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    Insize 4120-7N – Metric Thread Ring Gage, No Go, M7x1

    Insize

    $64.00
    Insize 4120-7N – Metric Thread Ring
    4120-7N
    SKU:
    4120-7N
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.08 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4120-7N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341731
    Package Weight:
    0.08 lb
    Package Length:
    1.69 in
    Package Width:
    1.61 in
    Package Height:
    0.59 in
    Feature 1:
    Go and No-Go gages are supplied separately.
    Feature 2:
    Class 6g.
    Feature 3:
    Standard ISO1502.
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $64.00
    Add to Cart Quick view
  • Insize 4120-8 precision measuring tool
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    Insize 4120-8 – Metric Thread Ring Gage, Go, M8x1.25

    Insize

    $71.00
    Insize 4120-8 – Metric Thread Ring
    4120-8
    SKU:
    4120-8
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.17 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4120-8
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341434
    Package Weight:
    0.17 lb
    Package Length:
    1.69 in
    Package Width:
    1.61 in
    Package Height:
    0.59 in
    Feature 1:
    Go and No-Go gages are supplied separately.
    Feature 2:
    Class 6g.
    Feature 3:
    Standard ISO1502.
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $71.00
    Add to Cart Quick view
  • Insize 4120-8N precision measuring tool
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    Insize 4120-8N – Metric Thread Ring Gage, No Go, M8x1.25

    Insize

    $71.00
    Insize 4120-8N – Metric Thread Ring
    4120-8N
    SKU:
    4120-8N
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.09 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4120-8N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341748
    Package Weight:
    0.09 lb
    Package Length:
    1.69 in
    Package Width:
    1.61 in
    Package Height:
    0.59 in
    Feature 1:
    Go and No-Go gages are supplied separately.
    Feature 2:
    Class 6g.
    Feature 3:
    Standard ISO1502.
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $71.00
    Add to Cart Quick view
  • Insize 4120-9 precision measuring tool
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    Insize 4120-9 – Metric Thread Ring Gage, Go, M9x1.25

    Insize

    $71.00
    Insize 4120-9 – Metric Thread Ring
    4120-9
    SKU:
    4120-9
    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:
    4120-9
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341441
    Package Weight:
    0.16 lb
    Package Length:
    1.69 in
    Package Width:
    1.61 in
    Package Height:
    0.59 in
    Feature 1:
    Go and No-Go gages are supplied separately.
    Feature 2:
    Class 6g.
    Feature 3:
    Standard ISO1502.
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $71.00
    Add to Cart Quick view
  • Insize 4120-9N precision measuring tool
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    Insize 4120-9N – Metric Thread Ring Gage, No Go, M9x1.25

    Insize

    $71.00
    Insize 4120-9N – Metric Thread Ring
    4120-9N
    SKU:
    4120-9N
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.09 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4120-9N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341755
    Package Weight:
    0.09 lb
    Package Length:
    1.69 in
    Package Width:
    1.61 in
    Package Height:
    0.59 in
    Feature 1:
    Go and No-Go gages are supplied separately.
    Feature 2:
    Class 6g.
    Feature 3:
    Standard ISO1502.
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $71.00
    Add to Cart Quick view
  • Insize 4120-S7 precision measuring tool
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    Insize 4120-S7 – Metric Thread Ring Gage Set, Go, Go Ring Gage Set, 6g, ISO 1502, 7 Pcs

    Insize

    $457.85
    Insize 4120-S7 – Metric Thread Ring
    4120-S7
    SKU:
    4120-S7
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    1.04 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4120-S7
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341960
    Package Weight:
    1.04 lb
    Package Length:
    6.3 in
    Package Width:
    3.74 in
    Package Height:
    1.38 in
    Feature 1:
    Standard ISO1502.
    Feature 2:
    Supplied with manufacturer inspection certificate.
    Feature 3:
    Standard ISO1502.
    $457.85
    Add to Cart Quick view
  • Insize 4120-S7N precision measuring tool
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    Insize 4120-S7N – Metric Thread Ring Gage Set, No Go, No Go Ring Gage Set, 6g, ISO 1502, 7 Pcs

    Insize

    $425.84
    Insize 4120-S7N – Metric Thread Rin
    4120-S7N
    SKU:
    4120-S7N
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.75 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4120-S7N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640341977
    Package Weight:
    0.75 lb
    Package Length:
    3.74 in
    Package Width:
    2.48 in
    Package Height:
    1.26 in
    Feature 1:
    Standard ISO1502.
    Feature 2:
    Supplied with manufacturer inspection certificate.
    Feature 3:
    Standard ISO1502.
    $425.84
    Add to Cart Quick view
  • Insize 4121-102 precision measuring tool
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    Insize 4121-102 – American Standard Thread Ring Gage, Go, 10-32UNF

    Insize

    $112.00
    Insize 4121-102 – American Standard
    4121-102
    SKU:
    4121-102
    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:
    4121-102
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359118
    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
    Add to Cart Quick view
  • Insize 4121-102N precision measuring tool
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    Insize 4121-102N – American Standard Thread Ring Gage, No Go, 10-32UNF

    Insize

    $81.20
    Insize 4121-102N – American Standar
    4121-102N
    SKU:
    4121-102N
    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:
    4121-102N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359200
    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
    Add to Cart Quick view
  • Insize 4121-1A1 precision measuring tool
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    Insize 4121-1A1 – American Standard Thread Ring Gage, Go, 1/2-13UNC

    Insize

    $123.00
    Insize 4121-1A1 – American Standard
    4121-1A1
    SKU:
    4121-1A1
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.31 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4121-1A1
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359286
    Package Weight:
    0.31 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.
    $123.00
    Add to Cart Quick view
  • Insize 4121-1A1N precision measuring tool
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    Insize 4121-1A1N – American Standard Thread Ring Gage, No Go, 1/2-13UNC

    Insize

    $86.60
    Insize 4121-1A1N – American Standar
    4121-1A1N
    SKU:
    4121-1A1N
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.21 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4121-1A1N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359378
    Package Weight:
    0.21 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.
    $86.60
    Add to Cart Quick view
  • Insize 4121-1A2 precision measuring tool
    Add to Cart
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    Insize 4121-1A2 – American Standard Thread Ring Gage, Go, 1/2-20UNF

    Insize

    $114.00
    Insize 4121-1A2 – American Standard
    4121-1A2
    SKU:
    4121-1A2
    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:
    4121-1A2
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359293
    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:
    GO Side
    Feature 3:
    Standard ANSI/ASME B1.2
    Feature 4:
    Supplied with manufacturer inspection certificate.
    $114.00
    Add to Cart Quick view
  • Insize 4121-1A2N precision measuring tool
    Add to Cart
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    Insize 4121-1A2N – American Standard Thread Ring Gage, No Go, 1/2-20UNF

    Insize

    $83.50
    Insize 4121-1A2N – American Standar
    4121-1A2N
    SKU:
    4121-1A2N
    Availability:
    Ships direct from Insize. Most items in stock; we confirm your ship date by email after you order.
    Weight:
    0.17 LBS
    Brand:
    Insize
    Manufacturer Part Number:
    4121-1A2N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359385
    Package Weight:
    0.17 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.
    $83.50
    Add to Cart Quick view
  • Insize 4121-1B1 precision measuring tool
    Add to Cart
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    Insize 4121-1B1 – American Standard Thread Ring Gage, Go, 1/4-20UNC

    Insize

    $112.00
    Insize 4121-1B1 – American Standard
    4121-1B1
    SKU:
    4121-1B1
    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:
    4121-1B1
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359125
    Package Weight:
    0.16 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.
    $112.00
    Add to Cart Quick view
  • Insize 4121-1B1N precision measuring tool
    Add to Cart
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    Insize 4121-1B1N – American Standard Thread Ring Gage, No Go, 1/4-20UNC

    Insize

    $81.90
    Insize 4121-1B1N – American Standar
    4121-1B1N
    SKU:
    4121-1B1N
    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:
    4121-1B1N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359217
    Package Weight:
    0.14 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.
    $81.90
    Add to Cart Quick view
  • Insize 4121-1B2 precision measuring tool
    Add to Cart
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    Insize 4121-1B2 – American Standard Thread Ring Gage, Go, 1/4-28UNF

    Insize

    $123.00
    Insize 4121-1B2 – American Standard
    4121-1B2
    SKU:
    4121-1B2
    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:
    4121-1B2
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359132
    Package Weight:
    0.14 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.
    $123.00
    Add to Cart Quick view
  • Insize 4121-1B2N precision measuring tool
    Add to Cart
    Quick view

    Insize 4121-1B2N – American Standard Thread Ring Gage, No Go, 1/4-28UNF

    Insize

    $86.30
    Insize 4121-1B2N – American Standar
    4121-1B2N
    SKU:
    4121-1B2N
    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:
    4121-1B2N
    Product Family:
    Gages and Reference Tools
    Supplier Category Code:
    A
    EAN:
    6928640359224
    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.
    $86.30
    Add to Cart Quick view