Tool Joint Thread Chart

Description

Popular Sizes

The thread dimensions shown in the following chart are those that may be used to determine a thread type in the field. For specific details of the threads, please contact Mills Machine Co.

Popular Sizes

The thread dimensions shown in the following chart are those that may be used to determine a thread type in the field. For specific details of the threads, please contact Mills Machine Co.

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
2 3/8″ Reg.3 1/8″3″1″2.625″3 1/4″1 3/4″3″5TAPER
2 7/8″ Reg.3 3/4″3 1/2″1 1/4″2.990″3 3/4″2″3″5TAPER
3 1/2″ Reg.4 1/4″4 1/2″3 3/4″1 1/2″3.490″4″2 7/16″3″5TAPER
4 1/2″ Reg.5 1/2″4 1/4″2 1/4″4.600″4 1/2″3 1/4″3″5TAPER
5 1/2″ Reg.6 3/4″4 3/4″2 3/4″5.515″5″3 3/8″3″4TAPER
6 5/8″ Reg.7 3/4″8″5″3 1/2″5.975″5 1/4″4 3/4″2″4TAPER
7 5/8″ Reg.8 7/8″9″5 1/4″3 1/2″6.975″5 1/2″5 1/4″3″4TAPER
8 5/8″ Reg.10″5 3/8″4″7.951″6 1/4″6 5/8″3″4TAPER

API INTERNAL FLUSH (IF)

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
2″ IF2 3/82 1/41 1/81.9752 3/41 1/224TAPER
2 3/8″ IF3 1/2″3″1 5/8″2.860″3 1/4″2 1/8″2″4TAPER
2 5/8″ IF LH3 3/4″3 1/4″1 3/4″3.128″3 5/8″2 1/4″2″4TAPER
2 7/8″ IF4 1/8″4 1/2″3 1/2″2 1/8″3.385″3 3/4″2 1/2″2″4TAPER
3 1/2″ IF4 3/4″4″2 11/16″4.000″4 1/4″3 1/4″2″4TAPER
4″ IF (4 1/2″ XH)6″4 1/2″3 1/4″4.828″4 3/4″3 1/2″2″4TAPER
4 1/2″ IF (5″ XH)6 1/8″4 1/2″3 3/4″5.250″4 3/4″4″2″4TAPER
5 1/2″ IF7 3/8″5″4 13/16″6.390″5 1/2″5 1/16″2″4TAPER
6 5/8 IF9″5″3 3/47.4595 5/86 1/424TAPER

API FULL HOLE (FH)

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
2 7/8″ FH4 1/4″4 1/2″3 1/2″2 1/8″3 7/8″2 1/8″3″5TAPER
3 1/2″ FH4 5/8″3 3/4″2 7/16″3.990″4″2 7/8″3″5TAPER
4″ FH5 1/4″4 1/2″2 13/16″4.270″4 3/4″3 1/4″2″4TAPER
4 1/2″ FH5 3/4″4″3″4.782″4 1/4″3 1/4″3″5TAPER
5 1/2″ FH7″5″4″5.828″5 1/2″4 1/4″2″4TAPER
6 5/8″ FH8″5″5″6.740″5 1/2″5 1/2″2″4TAPER

MAYHEW

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
JUNIOR (MJ)2 3/4″2 1/4″1 1/4″2.320″2 1/2″1 11/16″2″4TAPER
REGULAR (MR)3 1/4″3″1 1/2″2.555″3 1/4″2″1 1/2″4TAPER
FULLHOLE (MFH)3 3/4″3 3/8″2″3.045″3 5/8″2 3/8″1 1/2″4TAPER

FAILING EXPLORATION

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
2 3/8″ FEDP3 1/8″2 3/4″1 3/8″2.480″3″1 3/4″2″4TAPER
2 7/8″ FEDP3 3/4″3 1/4″1 7/8″3.100″3 1/2″2 1/4″2″4TAPER

SQUARE THREAD & DCDMA THREADS

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
3 THREAD N ROD2 3/8″2 3/4″1″1.860″3″1 5/8″3SQUARE
4 THREAD N ROD2 3/8″2 3/4″1″1.865″3″1 5/8″4SQUARE
A ROD1 5/8″1 7/8″9/16″1.260″2 1/8″1 1/16″3SQUARE
AW ROD1 3/4″1 7/8″5/8″1.365″2 1/8″1 1/4″3SQUARE
AWJ (AWML)1 3/4″1 3/4″5/8″1.425″1 7/8″1″2″5TAPER
E ROD1.305″1 3/4″7/16″0.996″2″7/8″3SQUARE
B W2 3/8″2 1/4″3/4″1.680″2 5/8″1 3/8″3SQUARE
BQ2 3/16″4 3/4″1 13/16″2″1 13/16″1/2″3TAPER
HW3 1/2″3 1/4″2 1/4″3 1/2″2 13/16″3SQUARE
EW1 3/8″1 9/16″7/16″1.050″1 3/4″7/8″3SQUARE
NW2 5/8″2 3/4″1 3/8″2.210″3″2″3SQUARE
NWJ (NWML)2 5/8″2 3/8″1 1/4″2.240″2 3/4″1 1/2″2″4TAPER

Other Sizes

API X-HOLE (XH)

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
3 1/2″ XH4 7/8″3 1/2″2 7/16″3.800″3 7/8″2 7/8″2″4TAPER
4 1/2″ XH6″4 1/2″3 1/4″4.828″4 3/4″3 1/2″2″4TAPER
5″ XH6 1/8″4 1/2″3 3/4″5.250″4 3/4″4″2″4TAPER

HACKER

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
JUNIOR3 1/8″2 1/4″1 7/8″2.685″2 3/4″2 1/8″1 3/4″5TAPER
SENIOR3 1/2″2 1/2″1 3/4″2.895″2 3/4″2 1/4″1 1/2″4TAPER
4″ HACKER5 7/8″3 5/8″3 3/4″5.215″4″4 3/8″1 1/2″4TAPER
6 5/8″ HACKER7 1/2″3 1/16″6″6.935″3 1/2″6 1/4″1 1/2″4TAPER
8 5/8″ HACKER10 1/2″4 1/2″7 1/2″9.460″5″8″2″4TAPER

BECO

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
3 1/2″ BECO4 3/4″3 3/4″1 1/2″3.970″4 1/4″2 1/4″3″2TAPER
4 1/2″ BECO5 3/4″ or 6 1/2″4 1/4″2 1/4″5.000″5″3 1/4″3″2TAPER
5 1/4″ BECO7″5 3/4″2 13/16″5.750″5 1/2″3 3/4″3″2TAPER
6″ BECO7 5/8″ or 8 3/4″6 1/2″3″6.500″5 1/2″+4 1/2″3″2TAPER
8″ BECO10 3/4″ or 12 3/4″4 7/8″5″8.500″5 1/2″+6 1/4″3″2TAPER

CA-21 (DEEP ROCK)

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
CA 212 1/4″1 1/4″1 1/8″1.765″1 1/2″1 1/2″1 1/2″6TAPER

E U E

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
3/4″ (1.050″ API)1.560″1 1/8″1.315″0.825″1 3/8″3/4″10TAPER
1″ (1.315″ API)1.900″1 1/4″1.469″1.049″1 1/2″3/4″10TAPER
1 1/4″ (1.660″ API)2.200″1 3/8″1.825″1.380″1 3/4″1 1/2″3/4″10TAPER
1 1/2″ (1.900″ API)2.500″1 7/16″2.093″1.610″1 7/8″1 3/4″3/4″10TAPER
2″ (2 3/8″ API)3.063″1 15/16″2.625″1.995″2 3/8″2 1/4″3/4″8TAPER
2 1/2″ (2 7/8″ API)3.668″2 1/8″3.113″2.441″2 1/2″2 1/2″3/4″8TAPER
3″ (3 1/2″ API)4.500″2 3/8″3.795″2.992″2 3/4″3 5/16″3/4″8TAPER
3 1/2″ (4″ API)5.000″2 1/2″4.250″3.476″2 7/8″3/4″8TAPER
4″ (4 1/2″ API)5.563″2 5/8″4.790″3.958″3″3/4″8TAPER

HACKER FAILING

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
6 5/8″ HF8″3 1/2″6″7.310″4 1/2″6 1/2″1.5″4TAPER

MOBILE

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
2 5/8″ MOBILE2 5/8″2 1/2″1 1/4″2.240″2 7/8″1 3/4″2″5TAPER

NATIONAL PIPE THREAD

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
1″ NPT1 3/4″1″1″1.325″1 1/4″1 1/8″3/4″11 1/2TAPER
1″ NPT LH1 3/4″1″1″1.325″1 1/4″1 1/8″3/4″11 1/2TAPER
1 1/4″ NPT2″1″1 1/4″1.660″1 1/4″1 3/8″3/4″11 1/2TAPER
1 1/2″ NPT2 1/4″1 1/8″1 1/2″1.950″1 3/8″1 5/8″3/4″11 1/2TAPER
2″ NPT2 3/4″1 1/8″2″2.385″1 5/8″2 1/8″3/4″11 1/2TAPER
2″ NPT LH2 3/4″1 1/8″2″2.3851 5/8″2 1/8″3/4″11 1/2TAPER
2 1/2″ NPT3 1/4″1 9/16″2 1/2″2.875″1 3/4″2 5/8″3/4″8TAPER
3″ NPT4″1 5/8″3″3.500″1 7/8″3 1/8″3/4″8TAPER
3″ NPT LH4″1 5/8″3″3.500″1 7/8″3 1/8″3/4″8TAPER
3 1/2″ NPT4 5/8″1 11/16″3 1/2″4.000″2 1/16″3 5/8″3/4″8TAPER
3 1/2″ NPT LH4 5/8″1 11/16″3 1/2″4.000″2 1/16″3 5/8″3/4″8TAPER
4″ NPT5 1/4″1 3/4″4″4.510″2 1/4″4 1/8″3/4″8TAPER
4″ NPT LH5 1/4″1 3/4″4″4.510″2 1/4″4 1/8″3/4″8TAPER
4 1/4″ NPT4 1/4″4.250″3/4″8TAPER
5″ NPT6 5/16″2″5″5.563″2 1/2″5 1/4″3/4″8TAPER
6″ NPT7 3/8″2″6″6.625″2 1/2″6 1/4″3/4″8TAPER

PK RED DEVIL

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
P K Red Devil2 7/8″3 7/8″1 3/8″2.300″4 1/4″1 7/8″3/4″8TAPER

ROCKMASTER

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
ROCKMASTER2 3/4″3″1 1/8″2.030″3 1/4″1 3/4″3ACME

WINTER WEISS

MaterialPin DimensionsBox DimensionsThread
Tool Joint Name & Nominal SizeO.D.Make to Dia.Pin LengthPin IDPin Dia. @ BaseBox LengthBox Max IDTaperThread / InchThread Form
2 3/8″ WW Mod.3 1/4″3″1 1/2″2.535″3 1/4″2″1.5″4TAPER
2 7/8 WW Mod.3 7/16″3″1 1/2″2.535″3 1/4″2″1.5″4TAPER