Subs and Adapters Manufacturer
Essential connector for joining drill-string components with different thread types or sizes — such as drill pipe, drill collars, and bits.
We offer a full range of configurations to ensure a perfect match for your string.
Product Types for Your Specific Challenge
We understand you need a reliable solution to a field problem, not just a part number from a list. That’s why we categorize our subs by their core function in your drilling operation, helping you quickly identify the product you need.
Why Choose Our Subs & Adapters
Your trust is earned through our commitment to technical excellence and total transparency. We turn promises of quality into proof of performance with undeniable technical evidence.
Precise Compatibility
Manufactured to API thread forms and customer prints for a perfect fit.
Strength & Longevity
Premium alloy steels with controlled heat treatment for high torsional capacity.
Consistent Quality
ISO-aligned QC, 100% inspection on critical dimensions and threads.
Custom on Short Lead Times
Non-standard OD/length/materials and special thread conversions available.
Global Delivery
Export-ready packaging and logistics support to major ports/air hubs.
Threading & Compatibility
Precision-cut API and premium threads for smooth make-up, stable torque transfer, and reliable drill string compatibility.
Input we need:
Thread type, size, hand (RH/LH), connection gender, taper, OD/ID, make-up torque target, and any shoulder/profile requirements.
Fit assurance:
Certified ring/gauge verification; blueing and thread profile inspection on every piece.
Conversion examples:
IF↔REG • NC↔IF • REG↔FH • Proprietary↔API (subject to license/print).
Materials & Heat Treatment
High-strength alloy steel + controlled quench-and-temper for stable torque, impact resistance and longer service life in the hole.
The Critical Role of Heat Treatment
Our precise quenching and tempering ensures every sub’s ideal strength, toughness, and fatigue resistance.
Premium High-Strength Alloy Steel
Crafted from industry-benchmark AISI 4145H / 4340 heat-treated alloy steel, ensuring maximum strength and toughness under the highest torque and cyclic loads.
Surface protection
Phosphate/oil or customer-specified coating; optional hardbanding for wear.
Our Craftsmanship
Frequently Asked Questions
Have questions? We have clear answers. Here we’ve gathered you need to know about our fly cutter reamer—so you can make your purchase with complete confidence.
Yes. Our in-house engineering team and advanced CNC machining capabilities allow us to produce virtually any type of non-standard or proprietary thread. Please provide your drawings or detailed connection requirements for our engineers to evaluate.
Absolutely. We provide subs that are fully compliant with the requirements of NACE MR0175 and API Spec 7-1 for H2S environments. This involves specific material grades, strictly controlled heat treatment processes, and extensive hardness testing to prevent sulfide stress cracking (SSC).
We maintain an inventory of semi-finished standard configurations (e.g., NC50, 4-1/2″ IF) for quick delivery. Lead times for custom parts depend on material availability and manufacturing complexity. Please request a quote for an accurate delivery time for your specific needs.
Yes. Private label / laser marking is supported.
Call Us or Fill Out the Form Below
Our service team will reply to you within 1 business day.
+86 13673277680
+86 13673277680
info@enshengbit.com
Office Address：Economic Development Zone (West Area), Hejian City, Hebei Province, China
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