For Use With For Use With |
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Thread Size Thread Size |
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For Screw Size For Screw Size |
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For Drill Bit Size For Drill Bit Size |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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For Nut Size For Nut Size |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Screw Size Identifiers


Find thread size, screw size, thread pitch, diameter, or drill bit size.
For Use With | For Thread Type | For Thread Location | For Thread Size | For Screw Size | For Thread Pitch | For Dia. | For Drill Bit Size | Wd. | Ht. | Thick. | Each | |
Inch | ||||||||||||
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Steel | ||||||||||||
Screws, Bolts, Threaded Rods, Pins, Rivets, Drill Bits | UNC/UNF | External | 1-64, 1-72, 2-56, 2-64, 3-48, 3-56, 4-36, 4-40, 4-48, 5-40, 5-44, 6-32, 6-36, 6-40, 8-32, 8-36, 8-40, 10-24, 10-32, 12-24, 12-28, 12-32, 1/4"-20, 1/4"-28, 1/4"-32, 5/16"-18, 5/16"-24, 5/16"-32 | No. 1, No. 2, No. 3, No. 4, No. 5, 1/8", No. 6, 5/32", No. 8, 3/16", No. 10, No. 12, 7/32", 1/4", 9/32", 5/16" | __ | 0.073", 0.086", 3/32", 0.112", 1/8", 0.138", 5/32", 0.164", 3/16", 7/32", 1/4", 9/32", 5/16" | 7/32", 1/4", 9/32", 5/16", 53 ga, 51 ga, 50 ga, 48 ga, 47 ga, 45 ga, 43 ga, 42 ga, 39 ga, 38 ga, 37 ga, 36 ga, 35 ga, 33 ga, 30 ga, 29 ga, 28 ga, 25 ga, 23 ga, 21 ga, 19 ga, 16 ga, 14 ga, 13 ga, 10 ga, 8 ga, 3 ga, F, I | 3" | 5 1/8" | 5/64" | 000000000 | 000000 |
Metric | ||||||||||||
Plastic | ||||||||||||
Screws, Bolts, Threaded Rods | Metric | External | __ | M2.3, M2.6, M3, M3.5, M4, M4.5, M5, M5.5, M6, M7, M8, M9, M10, M11, M12, M14, M16, M18, M20, M22, M24 | 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2.5 mm, 3 mm | __ | __ | 9 1/2" | 4" | 7/16" | 0000000 | 00000 |
Steel | ||||||||||||
Screws, Bolts, Threaded Rods | Metric | External | M8 × 0.75 mm, M8 × 1 mm, M8 × 1.25 mm, M9 × 0.75 mm, M9 × 1 mm, M9 × 1.25 mm, M10 × 0.75 mm, M10 × 1 mm, M10 × 1.25 mm, M10 × 1.5 mm, M11 × 0.75 mm, M11 × 1 mm, M11 × 1.5 mm, M12 × 1 mm, M12 × 1.25 mm, M12 × 1.5 mm, M12 × 1.75 mm, M14 × 1.25 mm, M14 × 1.5 mm, M14 × 2 mm | M8, M9, M10, M11, M12, M14 | __ | __ | __ | 5 1/8" | 5 3/8" | 1/8" | 000000000 | 00000 |
Screws, Bolts, Threaded Rods, Drill Bits | Metric | External | M2 × 0.25 mm, M2 × 0.4 mm, M2.2 × 0.25 mm, M2.2 × 0.45 mm, M2.5 × 0.35 mm, M2.5 × 0.45 mm, M3 × 0.35 mm, M3 × 0.5 mm, M3.5 × 0.35 mm, M3.5 × 0.6 mm, M4 × 0.5 mm, M4 × 0.7 mm, M4.5 × 0.5 mm, M4.5 × 0.75 mm, M5 × 0.5 mm, M5 × 0.8 mm, M5.5 × 0.5 mm, M6 × 0.75 mm, M6 × 1 mm, M7 × 0.75 mm, M7 × 1 mm | M2, M2.2, M2.5, M3, M3.5, M4, M4.5, M5, M5.5, M6, M7 | __ | __ | 7/32", 52 ga, 50 ga, 48 ga, 46 ga, 45 ga, 43 ga, 39 ga, 37 ga, 32 ga, 31 ga, 30 ga, 28 ga, 25 ga, 22 ga, 21 ga, 18 ga, 16 ga, 10 ga, 8 ga, 4 ga, B, D, J | 3" | 5 3/8" | 3/32" | 000000000 | 00000 |
Wall-Mount Thread-It Screw, Bolt, and Nut Size Identifiers

Mount to a wall for easy access, and thread your fastener into holes or onto plugs for quick and accurate size identification.
Mounting Holes | |||||||||||
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For Use With | For Thread Type | For Thread Location | For Thread Size | Wd. | Ht. | Thick. | No. of | Hole Dia. | Fasteners Included | Each | |
Inch/Metric | |||||||||||
Steel | |||||||||||
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF/Metric | External/Internal | 6-32, 8-32, 10-24, 10-32, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, M4 × 0.7 mm, M5 × 0.8 mm, M6 × 1 mm, M7 × 1 mm, M8 × 1 mm, M8 × 1.25 mm, M10 × 1 mm, M10 × 1.25 mm, M10 × 1.5 mm, M12 × 1.25 mm, M12 × 1.5 mm, M12 × 1.75 mm, 7/16"-14 | 3" | 39" | 1/2" | 3 | 5/16" | No | 00000000 | 000000 |
Thread-It Screw, Bolt, and Nut Size Identifiers

Thread your fastener into holes or onto plugs for quick and accurate size identification.
For Use With | For Thread Type | For Thread Location | For Thread Size | Each | |
Inch | |||||
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Steel | |||||
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 6-32, 6-40, 8-32, 10-24, 10-32, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16, 1"-8, 1"-12 | 00000000 | 000000 |
Inch/Metric | |||||
Steel | |||||
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF/Metric | External/Internal | 6-32, 8-32, 10-24, 10-32, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, M4 × 0.7 mm, M5 × 0.8 mm, M6 × 1 mm, M7 × 1 mm, M8 × 1 mm, M8 × 1.25 mm, M10 × 1 mm, M10 × 1.25 mm, M10 × 1.5 mm, M12 × 1.25 mm, M12 × 1.5 mm, M12 × 1.75 mm | 00000000 | 00000 |
Metric | |||||
Steel | |||||
Screws, Bolts, Threaded Rods, Nuts | Metric | External/Internal | M3 × 0.5 mm, M4 × 0.7 mm, M5 × 0.8 mm, M6 × 1 mm, M7 × 1 mm, M8 × 1 mm, M8 × 1.25 mm, M10 × 1 mm, M10 × 1.25 mm, M10 × 1.5 mm, M12 × 1.25 mm, M12 × 1.5 mm, M12 × 1.75 mm, M14 × 1.5 mm, M14 × 2 mm, M16 × 1.5 mm, M16 × 2 mm, M20 × 1.5 mm, M20 × 2.5 mm, M24 × 2 mm, M24 × 3 mm | 00000000 | 00000 |
Screw, Bolt, and Nut Size Identifiers



Use on external and internal fastener threads.
For Use With | For Thread Type | For Thread Location | For Screw Size | For Thread Pitch | For Nut Size | Wd. | Ht. | Thick. | Each | |
Inch | ||||||||||
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Plastic | ||||||||||
Screws, Bolts, Threaded Rods, Nuts | __ | External/Internal | No. 8, No. 10, 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 3/4" | __ | No. 8, No. 10, 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8" | 7 1/2" | 2 3/8" | 1/64" | 000000000 | 00000 |
Inch/Metric | ||||||||||
Plastic | ||||||||||
Screws, Bolts, Threaded Rods, Nuts | __ | External/Internal | No. 6, No. 8, No. 10, 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 3/4", 1", M6, M7, M8, M10, M12, M14, M16, M18, M20, M22 | __ | No. 8, No. 10, 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8" | 9" | 3 3/4" | 1/64" | 000000000 | 00000 |
Metric | ||||||||||
Plastic | ||||||||||
Screws, Bolts, Threaded Rods, Nuts | Metric | External/Internal | M6, M7, M8, M10, M12, M14, M16 | 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm | M10, M11, M13, M17, M19, M22, M24 | 5 1/4" | 3 3/16" | 1/64" | 000000000 | 0000 |
Thread Identifier Sets

Set includes calipers and gauges to identify external and internal threads.
Container | |||||||
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For Use With | For Thread Type | For Thread Location | Type | Material | Includes | Each | |
Inch, Metric | |||||||
Steel | |||||||
Screws, Bolts, Threaded Rods, Nuts, Pipe | NPT, UNC, UNF, BSPT, BSPP, Metric | External/Internal | Folding Case | Plastic | Caliper, Instruction Book, Two Steel Angle Gauges, Two Steel Gauges | 000000 | 000000 |
Threads per Inch and Thread Pitch Identifiers


Determine threads per inch and thread pitch on a variety of external and internal threads.
Folded | |||||||||||
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For Use With | For Thread Type | For Thread Location | For Threads per Inch | For Thread Pitch | No. of Identifiers | Lg. | Wd. | Manufacturer | Manufacturer Model No. | Each | |
Inch | |||||||||||
Steel | |||||||||||
Screws, Bolts, Threaded Rods | BSW | External/Internal | 4, 4 1/2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 19, 20, 22, 24, 25, 26, 28, 30, 32, 34, 36, 40, 48, 60 | __ | 28 | 2 3/4" | 3/4" | Mitutoyo | 188-102 | 000000 | 000000 |
Screws, Bolts, Threaded Rods | BSW | External/Internal | 4, 4 1/2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 19, 20, 22, 24, 25, 26, 28, 30, 32, 36, 40, 48, 60, 62 | __ | 28 | 2 3/4" | 1/2" | __ | __ | 0000000 | 00000 |
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 4, 4 1/2, 5, 5 1/2, 6, 7, 8, 9, 10, 11, 11 1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42 | __ | 30 | 2 3/4" | 1/2" | __ | __ | 0000000 | 00000 |
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 4, 4 1/2, 5, 5 1/2, 6, 7, 8, 9, 10, 11, 11 1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84 | __ | 51 | 2 1/4" | 2 1/4" | __ | __ | 0000000 | 00000 |
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 6, 7, 8, 9, 10, 11, 11 1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42, 48, 50, 56, 60 | __ | 30 | 2 3/4" | 1/2" | __ | __ | 000000 | 00000 |
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF | External/Internal | 9, 10, 11, 11 1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40 | __ | 22 | 2 3/4" | 1/2" | __ | __ | 000000 | 00000 |
Stainless Steel | |||||||||||
Screws, Bolts, Threaded Rods, Nuts | Acme | External/Internal | 1, 1 1/3, 1 1/2, 1 3/4, 2, 2 1/2, 3, 3 1/2, 4, 5, 6, 7, 8, 9, 10, 12 | __ | 16 | 4 3/4" | 1" | __ | __ | 0000000 | 000000 |
Inch/Metric | |||||||||||
Steel | |||||||||||
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF/Metric | External/Internal | 4, 4 1/2, 5, 5 1/2, 6, 7, 8, 9, 10, 11, 11 1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 28, 29, 30, 32, 34, 36, 38, 40, 42 | 0.4 mm, 0.5 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm | 51 | 2 3/4" | 1/2" | __ | __ | 0000000 | 00000 |
Screws, Bolts, Threaded Rods, Nuts | UNC/UNF/Metric | External/Internal | 4, 6, 8, 10, 11, 11 1/2, 12, 13, 16, 20, 28, 32, 40, 56 | 0.5 mm, 0.75 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 6 mm | 28 | 2 3/4" | 1/2" | __ | __ | 0000000 | 00000 |
Metric | |||||||||||
Steel | |||||||||||
Screws, Bolts, Threaded Rods, Nuts | Metric | External/Internal | __ | 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.75 mm, 1.8 mm, 1.9 mm, 2 mm, 2.5 mm | 28 | 2 1/2" | 1/2" | Starrett | 156M | 0000000 | 00000 |
Screws, Bolts, Threaded Rods, Nuts | Metric | External/Internal | __ | 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.75 mm, 1.8 mm, 1.9 mm, 2 mm, 2.5 mm | 28 | 2 3/4" | 1/2" | __ | __ | 0000000 | 00000 |
Screws, Bolts, Threaded Rods, Nuts | Metric | External/Internal | __ | 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm | 22 | 2 3/4" | 1/2" | __ | __ | 0000000 | 00000 |
Acme Thread Identifiers

Identify Acme threads and use as a guide while grinding and cutting Acme threads to a 29° included angle.
For Use With | For Thread Location | For Threads per Inch | Wd. | Ht. | Thick. | Each | |
Steel | |||||||
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Screws, Bolts, Threaded Rods | External | 1, 1 1/3, 1 1/2, 1 3/4, 2, 2 1/2, 3, 4, 5, 6, 7, 8, 9, 10 | 3 3/8" | 1 5/8" | 7/64" | 0000000 | 000000 |
Threads per Inch and Center Identifiers

Identify threads per inch on external threads and find the center of your workpiece to line up thread-cutting tools. This identifier has a corrosion-resistant satin-chrome finish that reduces glare.
For Use With | For Thread Type | For Thread Location | For Threads per Inch | Lg. | Wd. | Thick. | Each | |
Inch | ||||||||
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Satin-Chrome Steel | ||||||||
Screws, Bolts, Threaded Rods | UNC/UNF | External | 14, 20, 24, 32 | 2 1/4" | 3/4" | 3/64" | 0000000 | 000000 |
All-in-One Identifiers

Find tube, pipe, fastener, wire, and drill bit sizes with one tool.
For Use With (Number of Sizes) | Wd. | Ht. | Material | Each | |
Plastic | |||||
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Tube (9), Tube Fittings (6), Pipe (9), Pipe Fittings (6), Screws and Bolts (20), Threaded Rods, Nuts (14), Nails (11), Wire (30), Drill Bits (21) | 8 11/16" | 4 1/4" | Plastic | 00000000 | 00000 |
Tube (11), Tube Fittings (10), Pipe (16), Pipe Fittings (10), Screws and Bolts (20), Threaded Rods, Nuts (20), Nails (16), Wire (51), Drill Bits (50) | 10 1/2" | 3 1/2" | Plastic | 00000000 | 0000 |
Threads per Inch and Thread Pitch Size Checkers


Inspect fasteners and verify threads with this checker. It includes three wires for each of the pitch diameters. Select the wire that best fits the threads; then calculate the pitch diameter with the equations provided.
Wire | ||||||||||||
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For Use With | For Thread Type | For Thread Location | For Threads per Inch | For Thread Pitch | For Acme Threads per Inch | No. of Wires | Lg. | Material | Container | Container Material | Each | |
Inch; Metric | ||||||||||||
Screws, Bolts, Threaded Rods, Pipe | NPT, UNC, UNF, Metric, Acme | External | 3, 3 1/2, 4, 4 1/2, 5, 5 1/2, 6, 7, 7 1/2, 8, 9, 10, 11, 11 1/2, 12, 13, 14, 16, 18, 20, 24, 27, 28, 32, 36, 40, 44, 48 | 0.5 mm, 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm | 3, 4, 5, 6, 8, 10, 12, 14, 16 | 48 | 2 3/4" | Stainless Steel | Pouch | Vinyl | 000000 | 000000 |