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• 2016-03-21

UNF Thread ANSI ASME B1 1 Specifications of International Thread Standards Main page Help Specifications ISO Coarse Thread metric DIN 13 1 ISO Fine Thread I metric DIN 13 2 ISO Fine Thread II metric DIN 13 3 ISO Fine Thread III metric DIN 13 4 ISO

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• 2016-03-21

28 Thread Series 28 UN and 28 UNR Series constant pitch threads with a pitch of 28 threads per inch Numerical tabulation of sizes major minor and pitch diameters Also the Minor Diameter and Tensile Stress areas

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• 2016-03-21

Although BSP is a foreign thread it isn t metric This is why it comes in imperial sizes 1 8 1 4 1 2 3 4 and so on Thread conforms to ISO 228 1 Port conforms to ISO 1179 Pitch amp diameter measured in inches e g G1 4 19 Parallel threads require o ring

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• 2016-03-21

British Standard Pipe Taper BSPT Threads Size Chart Thick ness mm 1 16 28 0 907 7 723 0 304 4 1 8 28 0 907 9 728 0 383 4 6 10 2 0 4 2 1 4 19 1 337 13 157 0 518 6 8 13 5 0 53 2 3 3 8 19 1 337 16 662 0 656 6 4 10 17 2 0 68 2 3 1 2 14 1 814 20 995 0 825 8

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• 2016-03-21

2018 1 8 nbsp 0183 32 1 8 2018 NPT Thread Chart NPT amp NPS Fittings Dimensions amp Sizes NPT amp NPS Threads NPT is NATIONAL PIPE TAPER AMERICAN – Thread form per ANSI ASME B1 20 1 NPS is NATIONAL PIPE STRAIGHT PARALLEL – Thread form per ANSI ASME B1

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• 2016-03-21

2021 2 2 nbsp 0183 32 1 Thread sizes in inches are specified by diameter and threads per inch For example in the screw size 10 24 the first digit refers to the thread diameter the and second digit is threads per inch TPI When the diameter smaller than 1 4 the value is indicated

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• 2016-03-21

1 4 20 UNC 0 0011 0 196 0 207 0 2175 0 2224 0 0049 0 2500 1 4 28 UNF 0 0010 0 211 0 220 0 2268 0 2311 0 0043 0 2500 5 16 18 UNC 0 0012 0 252 0 265 0 2764 0 2817 0 0053 0 3125 5 16 24 UNF 0 0011 0 267 0 277 0 2854 0 2902 0 0048 0 3125 3 8 16 3 8

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• 2016-03-21

2 1 4 2 2500 4 5 2 1057 1 9774 2 0094 2 1 2 2 5000 4 2 3376 2 1933 2 2294 The above data sheet can be used for information purpose only No responsibility can be accepted for errors or omissions by whatever cause Back to Thread Custom Screw

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• 2016-03-21

Thread Dimensions Nominal Dimensions of Standard Threads ODM Outside Diameter of the Male IDF Inside Diameter of the TPI Threads per Inch GHT 3 4 quot

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• 2016-03-21

95 rows nbsp 0183 32 ANSI ASME INTERNAL Screw Thread Size Chart All units are in inches Unified Screw Threads per ANSI ASME B1 1 1989 R2001 R2001 Nomenclature are used Acceptability criteria are described in ANSI ASME B1 3M 1992 R2001 Note This screw chart

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• 2016-03-21

dimension 37 angle will be approximately 45 after rolling If the 45 is critical and a compound angle is not feasible the chamfer may require machining after roll threading Unless otherwise specified thread lengths given will be assumed to be minimum Thread

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• 2016-03-21

28 4 27 7 33 General notes Dimensions are in millimeters unless otherwise indicated Dimension B is minimum length of perfect thread The length of useful thread B plus threads with fully formed roots and flat crests shall not be less than J

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• 2016-03-21

1 8 quot BSPP 28 0 907 0 581 9 728 9 147 8 566 0 0 107 0 107 0 214 0 0 0 282 0 214 0 1 4 quot BSPP 19 1 337 0 856 13 157 12 301 11 445 0 0 125 0 125 0 25 0

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• 2016-03-21

ASME B1 1 Section 8 3 In the table above d nom is nominal diameter in inches and TPI is threads per inch Flat Washer Dimensions The following table of flat washer dimensions was adapted from ASME B18 21 1 Table 11 for Type A Plain Washers Type A washers come in 2 series Narrow and Wide Size

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• 2016-03-21

2A External Threads for Machine Screws and SEMS ASME B 1 1 2002 Nominal Size Thread TPI Type Major Diameter Allowance Max Min Pitch Diameter Max Min Tolerance Tensile Strength Stress Area in 2 lb min Steel screws only 0 80 0 060

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• 2016-03-21

UNF – Unified National Fine Thread and Male UNC UNF threads are both parallel The UNC UNF flank angle is 60 176 Unified threads comes in three different classes for applications where a liberal tolerance is required to permit easy assembly even with slightly nicked threads most commonly used class for general applications

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• 2016-03-21

Unified Screw Threads Standard Series From 0 80 UNF to 1 4 56 UNS Pitch P Thread Per Inch TPI 1 P Major diameter screw D MM ISO Basic thread diameter screw

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• 2016-03-21

Choose from our selection of 1 4 quot 28 helicoils in a wide range of styles and sizes In stock and ready to ship Assortments include various sizes of helical inserts and a tap a drill bit and an installation tool for each thread size Also known as Heli Coil inserts the inserts have coils that expand once installed to securely anchor the insert

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• 2016-03-21

British Standard Pipe BSP thread chart BSP thread chart showing TPI and drill sizes SIZE TPI MAJOR EXT MINOR INT TAP DRILL 1 8 quot 28 9 728 8 566 8 70 1 4 quot 19 13 157 11 445 11 60 3 8 quot 19 16 662 14 950 15 00 1 2 quot 14 20 955 18 631

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• 2016-03-21

Tap size NF NC UNF UNC Threads per inch Basic major dia inches Basic effective dia inches Basic minor dia of ext threads inches Basic minor dia of int threads inches Drill size 0 80 UNF 80 0600 0519 0447 0465 3 64 1 64 UNC 64 0730 0629 0538 0561

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• 2016-03-21

Taper Thread Grease Fittings are used on cars trucks and many types of industrial machinery It is recommended that SAE LT taper threads Society of Automotive Engineers Lubrication Threads be installed into straight holes with a 1 4 28 UNF 3B straight threaded hole The included angle of the thread for a 1 4 quot 28 taper thread grease zerk is

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• 2016-03-21

Thread Height Male Thread h3 Thread Height Thread H1 Sorted by thread class Click here to return to the thread data chart page index

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• 2016-03-21

2016 5 16 nbsp 0183 32 28 0 907 1 2 quot 28 UNEF 0 5000 12 700 11 80 28 0 907 9 16 quot 24 UNEF 0 5625 14 288 13 40 24 1 058 5 8 quot 24 UNEF 0 6250 15 875 15 00 24 1 058 11 16 quot 24 UNEF 0 6875 17 462 16 60 24 1 058 3 4 quot 20 UNEF 0 7500 19 050 18 00 20 1 270 13 16 quot 20 20

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• 2016-03-21

Thread size refers to the nominal bore of the pipe Subtract approx 1 4″ 6mm from thread diameter measurement for nominal pipe size Pitch is Threads Per Inch TPI Gas R amp G also refer to BSP Male Iron Pipe may be BSP or NPT

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• 2016-03-21

2015 2 13 nbsp 0183 32 The thread series is generally relative to the outside diameter of the screw 20 threads per inch on a 1 4 quot diameter screw is considered coarse 1 4 20 UNC On a 3 4 quot diameter screw 20 threads per inch is considered extra fine 3 4 20 UNEF It also plays a role in determining the length of engagement UN standard series thread

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• 2016-03-21

2018 7 23 nbsp 0183 32 For US Fasteners you might see 1 4″ 20 and 1 4″ 28 To determine which of these is coarse thread and which is fine simply take the TPI number the 20 and the 28 and compare Remember a coarse thread means the threads are bigger so less will be able to fit within an inch so the 20 means the fastener is coarse thread and the 28 means the fastener is a fine thread

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• 2016-03-21

1 1 2 12 2A 1 4981 1 4867 1 4440 1 4376 1 3989 1 58100 Internal Thread Dimensions for Unified UNF Screw Threads Diameter Threads Per Inch TPI Thread Fit Class Major Diameter Pitch Diameter Minor Diameter Stress

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• 2016-03-21

4 Chart No 5 SI Metric Threads 60 Deg Angle SI Metric Threads 60 Deg Angle Dimensions in Millimetres Inch table below Thread Form Data Tapping Drill Clearance Drill Diameter O Diameter Core Pitch Depth Flat Effective Dia T P I Dec

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• 2016-03-21

95 rows nbsp 0183 32 ANSI ASME EXTERNAL Screw Thread Size Chart All units are in inches Unified

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• 2016-03-21

2021 12 20 nbsp 0183 32 UNF 1 4 quot 28G thread It has its origin in the USA Mainly used in chromatography HPLC applications Most common sizes are UNF 1 4 quot 28G and UNF 10 32G The digits 28 G and 32 G stand for the number of thread