300 Series Standard O-Ring Sizes 265–349 (AS568)

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300 Series — Cross-Section: 0.210″ This table lists all standard o-ring sizes in the AS568 300 series (dash numbers 265–349). All o-rings in this series have a cross-section diameter of 0.210″. The inner diameter (ID) ranges from 4.975″–22.940″. Need help designing a groove for these o-rings? See the Static O-Ring Groove Design Guide. For other … Read more

200 Series Standard O-Ring Sizes 201–264 (AS568)

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200 Series — Cross-Section: 0.139″ This table lists all standard o-ring sizes in the AS568 200 series (dash numbers 201–264). All o-rings in this series have a cross-section diameter of 0.139″. The inner diameter (ID) ranges from 0.171″–16.955″. Need help designing a groove for these o-rings? See the Static O-Ring Groove Design Guide. For other … Read more

100 Series Standard O-Ring Sizes 115–178 (AS568)

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100 Series — Cross-Section: 0.103″ This table lists all standard o-ring sizes in the AS568 100 series (dash numbers 115–178). All o-rings in this series have a cross-section diameter of 0.103″. The inner diameter (ID) ranges from 0.487″–11.196″. Need help designing a groove for these o-rings? See the Static O-Ring Groove Design Guide. For other … Read more

000 Series Standard O-Ring Sizes 001–114 (AS568)

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000 Series — Cross-Section: 0.070″ This table lists all standard o-ring sizes in the AS568 000 series (dash numbers 001–114). All o-rings in this series have a cross-section diameter of 0.070″. The inner diameter (ID) ranges from 0.029″–5.234″. Need help designing a groove for these o-rings? See the Static O-Ring Groove Design Guide. For other … Read more

Metric Thread — Tap Drill & Clearance Drill Chart (Coarse Pitch)

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Metric Tap & Clearance Drill Sizes This table covers standard coarse pitch metric threads (the default — if a drawing says “M10” without specifying pitch, it means M10×1.5 coarse). For each thread size, you get the tap drill (for cutting internal threads) and clearance drill (for a bolt to pass through freely). Thread Pitch (mm) … Read more

Tap Drill Size Chart — UNF (Unified National Fine)

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UNF Tap Drill Sizes UNF (Unified National Fine) threads have more threads per inch than UNC for the same diameter. They’re stronger in thin-walled parts, provide finer adjustment, and resist vibration loosening better — but they’re less forgiving and easier to cross-thread. Thread Size TPI Tap Drill Decimal (in) 75% Thread Clearance Drill #0-80 80 … Read more

Tap Drill Size Chart — UNC (Unified National Coarse)

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UNC Tap Drill Sizes UNC (Unified National Coarse) is the default thread series in the US. If a drawing says “1/2-13” — that’s UNC. Coarse threads are stronger, more forgiving of dirty conditions, and easier to assemble than fine threads. Thread Size TPI Tap Drill Decimal (in) 75% Thread Clearance Drill #1-64 64 #53 0.0595 … Read more

Unified Screw Thread Dimensions — Fine (UNF)

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UNF Thread Specifications UNF (Unified National Fine) threads per ASME B1.1. Fine threads have a larger minor diameter than coarse threads of the same nominal size, which means higher tensile strength and better performance in thin-walled parts. Size TPI Major Ø (in) Pitch Ø (in) Minor Ø (in) Tensile Stress Area (in²) #0-80 80 0.0600 … Read more

Unified Screw Thread Dimensions — Coarse (UNC)

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UNC Thread Specifications This table gives the basic thread dimensions for UNC (Unified National Coarse) threads per ASME B1.1. These are the numbers you need for thread design, tolerance calculation, and thread gauge verification. Size TPI Major Ø (in) Pitch Ø (in) Minor Ø (in) Tensile Stress Area (in²) #1-64 64 0.0730 0.0629 0.0527 0.00263 … Read more