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Tool Joint Thread Chart

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., Inc. or refer to the DCDMA Standards book.

API REGULAR (Reg.)
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
2 3/8" Reg. 3 1/8" 3" 1" 2.625" 3 1/4" 1 3/4" 3" 5 TAPER
2 7/8" Reg. 3 3/4" 3 1/2" 1 1/4" 2.990" 3 3/4" 2" 3" 5 TAPER
3 1/2" Reg. 4 1/4" 4 1/2" 3 3/4" 1 1/2" 3.490" 4" 2 7/16" 3" 5 TAPER
4 1/2" Reg. 5 1/2" 4 1/4" 2 1/4" 4.600" 4 1/2" 3 1/4" 3" 5 TAPER
5 1/2" Reg. 6 3/4" 4 3/4" 2 3/4" 5.515" 5" 3 3/8" 3" 4 TAPER
6 5/8" Reg. 7 3/4" 8" 5" 3 1/2" 5.975" 5 1/4" 4 3/4" 2" 4 TAPER
7 5/8" Reg. 8 7/8" 9" 5 1/4" 3 1/2" 6.975" 5 1/2" 5 1/4" 3" 4 TAPER
8 5/8" Reg. 10" 5 3/8" 4" 7.951" 6 1/4" 6 5/8" 3" 4 TAPER

API INTERNAL FLUSH (IF)
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
2" IF 2 3/8 2 1/4 1 1/8 1.975 2 3/4 1 1/2 2 4 TAPER
2 3/8" IF 3 1/2" 3" 1 5/8" 2.860" 3 1/4" 2 1/8" 2" 4 TAPER
2 5/8" IF LH 3 3/4" 3 1/4" 1 3/4" 3.128" 3 5/8" 2 1/4" 2" 4 TAPER
2 7/8" IF 4 1/8" 4 1/2" 3 1/2" 2 1/8" 3.385" 3 3/4" 2 1/2" 2" 4 TAPER
3 1/2" IF 4 3/4" 4" 2 11/16" 4.000" 4 1/4" 3 1/4" 2" 4 TAPER
4" IF (4 1/2" XH) 6" 4 1/2" 3 1/4" 4.828" 4 3/4" 3 1/2" 2" 4 TAPER
4 1/2" IF (5" XH) 6 1/8" 4 1/2" 3 3/4" 5.250" 4 3/4" 4" 2" 4 TAPER
5 1/2" IF 7 3/8" 5" 4 13/16" 6.390" 5 1/2" 5 1/16" 2" 4 TAPER
6 5/8 IF 9" 5" 3 3/4 7.459 5 5/8 6 1/4 2 4 TAPER

API FULL HOLE (FH)
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
2 7/8" FH 4 1/4" 4 1/2" 3 1/2" 2 1/8" 3 7/8" 2 1/8" 3" 5 TAPER
3 1/2" FH 4 5/8" 3 3/4" 2 7/16" 3.990" 4" 2 7/8" 3" 5 TAPER
4" FH 5 1/4" 4 1/2" 2 13/16" 4.270" 4 3/4" 3 1/4" 2" 4 TAPER
4 1/2" FH 5 3/4" 4" 3" 4.782" 4 1/4" 3 1/4" 3" 5 TAPER
5 1/2" FH 7" 5" 4" 5.828" 5 1/2" 4 1/4" 2" 4 TAPER
6 5/8" FH 8" 5" 5" 6.740" 5 1/2" 5 1/2" 2" 4 TAPER

MAYHEW
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
JUNIOR (MJ) 2 3/4" 2 1/4" 1 1/4" 2.320" 2 1/2" 1 11/16" 2" 4 TAPER
REGULAR (MR) 3 1/4" 3" 1 1/2" 2.555" 3 1/4" 2" 1 1/2" 4 TAPER
FULLHOLE (MFH) 3 3/4" 3 3/8" 2" 3.045" 3 5/8" 2 3/8" 1 1/2" 4 TAPER

FAILING EXPLORATION
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
2 3/8" FEDP 3 1/8" 2 3/4" 1 3/8" 2.480" 3" 1 3/4" 2" 4 TAPER
2 7/8" FEDP 3 3/4" 3 1/4" 1 7/8" 3.100" 3 1/2" 2 1/4" 2" 4 TAPER

SQUARE THREAD & DCDMA THREADS
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
3 THREAD N ROD 2 3/8" 2 3/4" 1" 1.860" 3" 1 5/8" 3 SQUARE
4 THREAD N ROD 2 3/8" 2 3/4" 1" 1.865" 3" 1 5/8" 4 SQUARE
A ROD 1 5/8" 1 7/8" 9/16" 1.260" 2 1/8" 1 1/16" 3 SQUARE
AW ROD 1 3/4" 1 7/8" 5/8" 1.365" 2 1/8" 1 1/4" 3 SQUARE
AWJ (AWML) 1 3/4" 1 3/4" 5/8" 1.425" 1 7/8" 1" 2" 5 TAPER
E ROD 1.305" 1 3/4" 7/16" 0.996" 2" 7/8" 3 SQUARE
B W 2 3/8" 2 1/4" 3/4" 1.680" 2 5/8" 1 3/8" 3 SQUARE
BQ 2 3/16" 4 3/4" 1 13/16" 2" 1 13/16" 1/2" 3 TAPER
HW 3 1/2" 3 1/4" 2 1/4" 3 1/2" 2 13/16" 3 SQUARE
EW 1 3/8" 1 9/16" 7/16" 1.050" 1 3/4" 7/8" 3 SQUARE
NW 2 5/8" 2 3/4" 1 3/8" 2.210" 3" 2" 3 SQUARE
NWJ (NWML) 2 5/8" 2 3/8" 1 1/4" 2.240" 2 3/4" 1 1/2" 2" 4 TAPER

Other Sizes

API X-HOLE (XH)
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
3 1/2" XH 4 7/8" 3 1/2" 2 7/16" 3.800" 3 7/8" 2 7/8" 2" 4 TAPER
4 1/2" XH 6" 4 1/2" 3 1/4" 4.828" 4 3/4" 3 1/2" 2" 4 TAPER
5" XH 6 1/8" 4 1/2" 3 3/4" 5.250" 4 3/4" 4" 2" 4 TAPER

HACKER
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
JUNIOR 3 1/8" 2 1/4" 1 7/8" 2.685" 2 3/4" 2 1/8" 1 3/4" 5 TAPER
SENIOR 3 1/2" 2 1/2" 1 3/4" 2.895" 2 3/4" 2 1/4" 1 1/2" 4 TAPER
4" HACKER 5 7/8" 3 5/8" 3 3/4" 5.215" 4" 4 3/8" 1 1/2" 4 TAPER
6 5/8" HACKER 7 1/2" 3 1/16" 6" 6.935" 3 1/2" 6 1/4" 1 1/2" 4 TAPER
8 5/8" HACKER 10 1/2" 4 1/2" 7 1/2" 9.460" 5" 8" 2" 4 TAPER

BECO
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
3 1/2" BECO 4 3/4" 3 3/4" 1 1/2" 3.970" 4 1/4" 2 1/4" 3" 2 TAPER
4 1/2" BECO 5 3/4" or 6 1/2" 4 1/4" 2 1/4" 5.000" 5" 3 1/4" 3" 2 TAPER
5 1/4" BECO 7" 5 3/4" 2 13/16" 5.750" 5 1/2" 3 3/4" 3" 2 TAPER
6" BECO 7 5/8" or 8 3/4" 6 1/2" 3" 6.500" 5 1/2"+ 4 1/2" 3" 2 TAPER
8" BECO 10 3/4" or 12 3/4" 4 7/8" 5" 8.500" 5 1/2"+ 6 1/4" 3" 2 TAPER

CA-21 (DEEP ROCK)
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
CA 21 2 1/4" 1 1/4" 1 1/8" 1.765" 1 1/2" 1 1/2" 1 1/2" 6 TAPER

E U E
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
3/4" (1.050" API) 1.560" 1 1/8" 1.315" 0.825" 1 3/8" 3/4" 10 TAPER
1" (1.315" API) 1.900" 1 1/4" 1.469" 1.049" 1 1/2" 3/4" 10 TAPER
1 1/4" (1.660" API) 2.200" 1 3/8" 1.825" 1.380" 1 3/4" 1 1/2" 3/4" 10 TAPER
1 1/2" (1.900" API) 2.500" 1 7/16" 2.093" 1.610" 1 7/8" 1 3/4" 3/4" 10 TAPER
2" (2 3/8" API) 3.063" 1 15/16" 2.625" 1.995" 2 3/8" 2 1/4" 3/4" 8 TAPER
2 1/2" (2 7/8" API) 3.668" 2 1/8" 3.113" 2.441" 2 1/2" 2 1/2" 3/4" 8 TAPER
3" (3 1/2" API) 4.500" 2 3/8" 3.795" 2.992" 2 3/4" 3 5/16" 3/4" 8 TAPER
3 1/2" (4" API) 5.000" 2 1/2" 4.250" 3.476" 2 7/8" 3/4" 8 TAPER
4" (4 1/2" API) 5.563" 2 5/8" 4.790" 3.958" 3" 3/4" 8 TAPER

HACKER FAILING
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
6 5/8" HF 8" 3 1/2" 6" 7.310" 4 1/2" 6 1/2" 1.5" 4 TAPER

MOBILE
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
2 5/8" MOBILE 2 5/8" 2 1/2" 1 1/4" 2.240" 2 7/8" 1 3/4" 2" 5 TAPER

NATIONAL PIPE THREAD
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
1" NPT 1 3/4" 1" 1" 1.325" 1 1/4" 1 1/8" 3/4" 11 1/2 TAPER
1" NPT LH 1 3/4" 1" 1" 1.325" 1 1/4" 1 1/8" 3/4" 11 1/2 TAPER
1 1/4" NPT 2" 1" 1 1/4" 1.660" 1 1/4" 1 3/8" 3/4" 11 1/2 TAPER
1 1/2" NPT 2 1/4" 1 1/8" 1 1/2" 1.950" 1 3/8" 1 5/8" 3/4" 11 1/2 TAPER
2" NPT 2 3/4" 1 1/8" 2" 2.385" 1 5/8" 2 1/8" 3/4" 11 1/2 TAPER
2" NPT LH 2 3/4" 1 1/8" 2" 2.385 1 5/8" 2 1/8" 3/4" 11 1/2 TAPER
2 1/2" NPT 3 1/4" 1 9/16" 2 1/2" 2.875" 1 3/4" 2 5/8" 3/4" 8 TAPER
3" NPT 4" 1 5/8" 3" 3.500" 1 7/8" 3 1/8" 3/4" 8 TAPER
3" NPT LH 4" 1 5/8" 3" 3.500" 1 7/8" 3 1/8" 3/4" 8 TAPER
3 1/2" NPT 4 5/8" 1 11/16" 3 1/2" 4.000" 2 1/16" 3 5/8" 3/4" 8 TAPER
3 1/2" NPT LH 4 5/8" 1 11/16" 3 1/2" 4.000" 2 1/16" 3 5/8" 3/4" 8 TAPER
4" NPT 5 1/4" 1 3/4" 4" 4.510" 2 1/4" 4 1/8" 3/4" 8 TAPER
4" NPT LH 5 1/4" 1 3/4" 4" 4.510" 2 1/4" 4 1/8" 3/4" 8 TAPER
4 1/4" NPT 4 1/4" 4.250" 3/4" 8 TAPER
5" NPT 6 5/16" 2" 5" 5.563" 2 1/2" 5 1/4" 3/4" 8 TAPER
6" NPT 7 3/8" 2" 6" 6.625" 2 1/2" 6 1/4" 3/4" 8 TAPER

P K RED DEVIL
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
P K Red Devil 2 7/8" 3 7/8" 1 3/8" 2.300" 4 1/4" 1 7/8" 3/4" 8 TAPER

ROCKMASTER
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
ROCKMASTER 2 3/4" 3" 1 1/8" 2.030" 3 1/4" 1 3/4" 3 ACME

WINTER WEISS
Tool Joint Name & Nominal Size Material Pin Dimensions Box Dimensions Thread
O.D. Make to Dia. Pin Length Pin ID Pin Dia. @ Base Box Length Box Max ID Taper Thread / Inch Thread Form
2 3/8" WW Mod. 3 1/4" 3" 1 1/2" 2.535" 3 1/4" 2" 1.5" 4 TAPER
2 7/8 WW Mod. 3 7/16" 3" 1 1/2" 2.535" 3 1/4" 2" 1.5" 4 TAPER

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