? ?3 7/8" steel tooth rock drill bit/ iadc code127 mill tooth tricone bit ? TCI Hardened?Steel?Body Tungsten?Carbide?Insert Open?or?Sealed?Journal?Roller?Bearing Carbide?Insert?Gauge?Protection?with?Hard?Facing ? Steel?Tooth Soft,?Medium,?and?Hard?Formation?Available Hardened?Steel?Body Steel?Tooth Open?or?Sealed?Journal?Roller?Bearing Hard?Facing?Gauge?protection Soft,?Medium,?and?Hard?Formation?Available
Rubber?sealing?tungsten?carbide?insert?bit?? IADC:?417,427,437,447,515,525,517‘527,535,545,537,547,617,627,637,737,827,837. ? Rubber?sealing?steel?tooth?bit? IADC:?114,115,116,117,124,125,126,127,134,135,136,137,214,215,216,217,244,246,247,324,325. Metal?sealing?tungsten?carbide?insert?bit? IADC:417,437,447,517,527,537,547,617,627,637,737,827,837 ? ?? ? 1.?Cutting?Structure?of?this?series?tricone?rock?bit?:
The?durability?of?premium?tungsten?carbide?inserts?is?improved?with?new?formulas?and?new?techniques?for?insert?bit.The?wear-resistance?of?teeth?is?enhanced?with?premium?tungsten?carbide?hardfacing?on?the?tooth?surfaces?for?steel?tooth?bit. ?
2.?Gauge?Structure?of?this?series?tricone?rock?bit?:
Multiple?gauge?protection?with?gauge?trimmers?on?heel?and?gauge?inserts?on?the?gauge?surface?of?the?cone,?tungsten?carbide?inserts?and?hardfacing?on?the?shirttail?increases?gauge?holding?capability?and?bearing?life. ?
3.Bearing?Structure?of?this?series?tricone?rock?bit?:
High?precision?bearing?with?two?thrust?faces.?Balls?lock?the?cone.Hardface?heard?bearing?surface.?Cone?bearing?inlaid?with?friction-reducing?alloy?and?then?silver-plated.?Abrasion?resistance?and?seizure?resistance?of?the?bearing?are?improved?and?suitable?for?high?rotary?speed. ?
4.Seal?and?Lubrication?of?this?series?tricone?rock?bit?:
The?advanced?metal?seal?package?consists?of?two?metal?seats?and?two?elastic?energizers.?Compressed?energizers?ensure?good?contact?being?kept?on?two?sealing?surfaces?of?metal?rings?by?elastic?force,?and?achieve?the?bearing?seal.?In?the?drilling,?metal?seal?are?relatively?dynamic,?and?the?energizers?are?static.?This?will?improve?the?reliability?and?durability?of?bearing?seal.?The?pressure?compensator?system?and?advanced?grease?can?greatly?increase?the?lubricating?reliability. ? 5.Product?Application?of?this?series?tricone?rock?bit?:
It?is?suitable?for?downhole?motor?and?high?speed?applications. ? ? ?

Bit?Size(in)	Connection	Bit?Size(in)	Connection
? 3?3/8,?3?3/4,?3?7/8 4?1/8,?4?1/4	? ? ??2?3/8???REG	9?1/2,???9?5/8?,?9?7/8 10,???10?1/2,???10?5/8 11,?11?5/8 ?	? ? ? ? ??6?5/8???REG
? 4?3/8,?4?1/2 4?5/8,?4?3/4 4?7/8	?? ? ? ? ??2?7/8???REG	12,???12?1/4,?12?5/16 12?3/8,?12?7/16,?12?5/8 13?1/8,???13?3/4,?13?5/8 13?1/2	? ? ? ? ??6?5/8???REG
5?1/8,?5?1/2,?5?5/8 5?7/8 6,?6?1/8,?6?1/4 6?1/2,?6?3/4,?6?5/8 6?7/8	? ? ? ?3?1/2???REG	? 14?1/2,?14?3/4 15?1/2 17?1/2 ?	? ? ? ?7?5/8???REG
7?1/2,?7?5/8,?7?7/8 8?3/8,?8?1/2 8?5/8,?8?3/4	? ?4?1/2???REG	? 20,?22,?24,?26	? ??7?5/8???REG
? ? ? IADC?CODE	(MT)?116?117?12?6127?136?137?216?217?226?226?316?317?326?327?336?337?115?125 ?135?215?225?235?315?325?335?114?124?214?314?111?121?131?346?347 ?
	(TCI)417?427?437?517?527?537?617?627?637?737?837?832?415?425?435?445?525?625 ?635?416?427?436?446?447?516?526??537?547?516?536??535 ?

? ? ? ?????? ?Contact me for quotation!? Hengji?bits?focus?on?Quality! ? ? ?? ? ? ? ? ? ? ? ???? ? ? ? ? ? ? ?