Drill subs are an important integral part of everyday drilling. Not having the right thread adapter can make your life miserable. We have a large inventory of common and not so common sizes. Custom sizes are always available.
Rotary subs have two primary applications. They can be used to cross over from one connection size to another, or as the disposable component used to extend the connection life of a more expensive drill stem member.
Installing a float sub (with check valve) is always a good idea when drilling in wet situations.
| Pin-Box Adaptors | |||||
| Number | Model | Size A (mm) | Size B (mm) | Size C (mm) | Wrench Flat (mm) |
| 1 | 2 3/8 REG pin - 2 3/8 REG box | 25 | 45 | 78 | 57 |
| 2 | 2 3/8 IF pin - 2 3/8 REG box | 25 | 45 | 89 | 70 |
| 3 | 2 3/8 IF pin - 2 3/8 IF box | 25 | 45 | 89 | 70 |
| 4 | 2 3/8 REG pin - 2 7/8 REG box | 25 | 45 | 102 | 70 |
| 5 | 2 7/8 IF pin - 2 7/8 IF box | 25 | 45 | 108 | 85 |
| 6 | 3 1/2 REG pin - 3 1/2 REG box | 25 | 50 | 114 | 95 |
| Box-Box Adaptors | |||||
| Number | Model | Size A (mm) | Size B (mm) | Size C (mm) | Wrench Flat (mm) |
| 1 | 2 3/8 REG box - 2 3/8 REG box | 97 | 45 | 89 | 70 |
| 2 | 2 3/8 REG box - 2 7/8 REG box | 115 | 50 | 102 | 85 |
| 3 | 2 3/8 IF box - 3 1/2 REG box | 102 | 50 | 114 | 95 |
| 4 | 2 7/8 REG box- 3 1/2 REG box | 122 | 50 | 114 | 95 |
| Pin-Pin Adaptors | |||||
| Number | Model | Size A (mm) | Size B (mm) | Size C (mm) | Wrench Flat (mm) |
| 1 | 2 3/8 REG pin - 2 3/8 REG pin | 21 | 45 | 89 | 70 |
| 2 | 3 1/2 REG pin - 3 1/2 REG pin | 23 | 50 | 114 | 95 |
| 3 | 3 1/2 REG pin - 4 1/2 REG pin | 30 | 50 | 140 | 102 |
| 4 | 4 1/2 REG pin - 4 1/2 REG pin | 30 | 50 | 140 | 102 |
Lake Petro is located in City, which is famous for Shengli Oilfield and the largest manufacturing hub of petroleum equipment. Following the principle of “quality first, science and technology innovated, people oriented”, every Lake Petro person is sparing no effort to provide the customers with best products and services. Our products are based on advanced
How can I place order?
A: You can
A: After you confirm our PI, we will request you to pay. T/T (HSBC bank), L/C, D/P, Western Union are the most usual ways we are using. If you want to use other way, please tell me, we can discuss.
A: First we discuss order details, production details by
A: replacement. If there are some defective items, we usually credit to




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Step 1
Payment and order readiness
Minimum order: 10 Units
Payment terms, specifications, and order details are confirmed before preparation begins.
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Step 2
Preparation
15 days
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Step 3
Packaging and dispatch
Economy · Approx. shipping fee: $ 376.88 for 10 pieces · Estimated delivery: Oct 4–Nov 10 (28–65 days)
Final packing, freight, and delivery dates are confirmed before dispatch.
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