14-631-396 “CMS-3” Taper Casing Slips, SDML 15572 “SD” Type Rotary Slips

Introduction: Durable Drilling Accessories to Eliminate Downtime and Ensure Operational Safety

For drilling contractors, rig maintenance teams, and well service technicians working in onshore oilfields, offshore platforms, and high-pressure sour gas wells, the reliability of every component—from large casing slips and rotary slips to small pins, bolts, and handles—directly impacts operational safety, efficiency, and costs. Field teams know firsthand that a single faulty part can trigger costly non-production time (NPT), wellbore damage, or even dangerous incidents, as highlighted by industry data showing that each drill string failure costs an average of $106,000 in direct losses, with small hardware and slip components accounting for 42% of such failures. Today, onshore rigs lose an average of $13,500 per hour of NPT, while offshore rigs face $56,000 per hour—losses that quickly eat into project profits, especially as global average well depths continue to increase, raising demands on component durability. Our comprehensive range of oil drilling accessories, including the 14-631-396 “CMS-3” Taper Casing Slips, 5 1/2” x 5” SDML 15572 “SD” Type Rotary Slips with Inserts, 34-122 3 1/2” Slip Assy. (1.315” – 3 1/2”) Less Inserts for 125 Ton, and over 88 other critical components, is engineered to eliminate these risks. All products fully comply with API Spec 7K:2015 (Drilling and Well Servicing Equipment), API Q1质量管理体系认证, NACE MR0175/ISO 15156 (Sour Service Requirements), and ISO 9001:2015 (Quality Management Systems)—credentials that serve as “technical passports” for global oilfield access. Each component undergoes 19 rigorous quality control checks—including tensile strength testing (minimum 1190 MPa), dimensional accuracy verification (±0.0011 inches), and 1500-hour salt spray corrosion trials—before leaving the factory, aligning with the strict quality standards required by major oil operators. Our core purpose is to provide perfectly compatible, durable accessories that fit specific equipment models (such as Type B/C Tongs, 125 Ton Slip Assemblies, “SD” Type Rotary Slips, “CMS-3” Taper Casing Systems, and TA-65 C.L.Elevator), addressing the specific needs of drillers who require reliable parts to maintain operational safety, reduce maintenance costs, and avoid costly NPT. Drawing on field maintenance best practices from global oilfields—including Saudi Arabia, Kuwait, and China’s Sichuan Basin—and industry expertise in drill tool reliability, our components are designed to match original equipment specifications, ensuring seamless integration and long-lasting performance in even the most demanding drilling environments—from shallow onshore wells to ultra-deep offshore platforms and tight “slim hole” operations.

Product Overview & Core Functions

Key Product Models & Compatibility

Each accessory in our lineup is precision-engineered to fit specific drilling equipment, solving common operational pain points that disrupt rig efficiency, compromise safety, and drive up costs—lessons learned from real field incidents and decades of maintenance experience, including insights from API 7K standards and global oilfield service feedback:

• 14-631-396 “CMS-3” Taper Casing Slips: These high-performance taper casing slips are designed for medium-to-heavy load casing operations, supporting loads up to 540 tons and compatible with casing sizes ranging from 4 1/2” to 14 1/4”. They feature a precision taper design that eliminates casing misalignment and slippage—critical issues that can delay well construction and add $105,000 in rework costs, especially in tight “slim hole” wells where annular间隙 is minimal. They pair perfectly with E27546 Setting Ring Retainer (3 1/2”), E55517 4” HYC Setting Ring, and E55520 5 1/2” HYC Setting Ring, adhering to the CMS-3 design standards that match industry-leading casing slip systems for enhanced compatibility and performance.

• 5 1/2” x 5” SDML 15572 “SD” Type Rotary Slips with Inserts: These heavy-duty rotary slips are tailored for high-load drilling operations, compatible with 5 1/2” drill pipe and 5” casing, supporting loads up to 145 tons. They eliminate the risk of pipe rotation and slippage during drilling—a common cause of wellbore damage that can cost $160,000 in repairs, as noted in IADC reports on drill string failures. They work seamlessly with 21-104-DSET 2 7/8” X 2 3/8” (SET) Inserts for Dual Slip and E940308-8 Grease Fittings, ensuring long-lasting performance even in high-cycle operations.

• 34-122 3 1/2” Slip Assy. (1.315” – 3 1/2”) Less Inserts for 125 Ton: This slip assembly is designed for heavy-load operations, supporting loads up to 125 tons and compatible with 1.315” to 3 1/2” drill pipe and casing. It prevents slip segment misalignment, a common cause of NPT that costs $50,000 per incident. It pairs with E39258-2 3 1/2” X 3 1/2” HYT Slip Assy. and 21-104-DSET Inserts, aligning with API 7K requirements for load-carrying components in heavy-duty drilling applications.

• Other Critical Components: T12434 Standard Lever (for Type B Tongs), T11511-1 Long Jaw Assy. (for Type C Tongs), E8151 Upper Link Block Bolt, NUT & COT., REAR HANDLE 7613-5195, and E32386 TA-65 C.L.ELEVATOR complete the system, ensuring every part works in harmony to avoid single-point failures—critical for maintaining the high safety and efficiency standards required by API Q1 and global oil operators.

Structural Features & Advantageous Design

Every accessory is built with field usability, durability, and safety in mind, addressing the most frustrating pain points drillers face daily—from frequent replacements to life-threatening alignment issues, and incorporating the same quality standards required by API 7K, API Q1, and NACE MR0175:

• High-Strength AISI 4140 Heat-Treated Alloy Steel: All slip segments (BODY SEGMENT 7638-5101-10), hinge pins (E55311, 737-000-0500), latches, link blocks, and bolts (E8145-2, E8151) are made of AISI 4140 alloy steel, with a tensile strength of 1190 MPa and a hardness rating of 37-41 HRC. This material withstands 215,000+ cycles of use without deformation, compared to the industry average of 115,000 cycles—meaning fewer replacements, less NPT, and enhanced safety, even in sour gas environments where stress corrosion is a risk. This durability aligns with the high standards of drill tool maintenance programs used in Saudi oilfields.

• Precision Machining & Dimensional Accuracy: Each component is machined to a tolerance of ±0.0011 inches, ensuring a perfect fit with original equipment—critical for compliance with API Q1 and API 7K’s design and manufacturing requirements. The SDML 15572 “SD” Type Rotary Slips, for example, have a surface finish of Ra 0.27 μm, reducing friction between the slip and pipe by 53% and minimizing wear on both the slip and pipe—critical for avoiding premature failure in high-cycle operations, especially in deep wells where component replacement is time-consuming.

• Corrosion & Wear Resistance: All exposed components feature a zinc-nickel coating (22-25 μm thick) and are treated with NACE MR0175-approved high-temperature anti-corrosion grease, protecting against salt spray, sour gas (H₂S content up to 29,000 ppm), and harsh environmental conditions. This coating extends component life by 100,000 cycles, even in offshore and sour gas environments—where corrosion is a leading cause of component failure, as noted in industry reports on oil well管 reliability. This corrosion resistance meets the standards required for Kuwait’s harsh offshore environments.

• User-Friendly & Safety-Focused Design: Components like the REAR HANDLE 7613-5195, FRONT HANDLE PIN 7613-B-12, and E940308-8 Grease Fitting are designed for quick, tool-free replacement, saving 30 minutes per maintenance task—aligning with the need to minimize NPT highlighted in industry data. The grease fittings are strategically placed for easy lubrication, even in tight spaces, reducing maintenance time and labor costs. Additionally, all components feature safety locks and retainers (E31332 LATCH LOCK, 34-630 “SAFETY BOLT 1”) to prevent accidental dislodgment during operation, mitigating risks like wellbore damage and equipment malfunctions that can lead to costly drill string failures.

Applicable Working Conditions

Our accessories are engineered to perform reliably in the toughest oil and gas drilling scenarios, where component durability and safety are critical to avoiding costly downtime and accidents—including the harsh environments where API 7K, API Q1, and NACE MR0175 compliance is mandatory:

• Onshore deep wells (desert, mountainous regions) with extreme temperature fluctuations (-59°C to 113°C), including sour gas wells where NACE MR0175 compliance is required to prevent stress corrosion, and remote rigs where replacement parts are hard to access—critical for minimizing NPT and ensuring safety, as unplanned downtime in these areas can be particularly costly, especially in deep wells where each hour of NPT adds significant expenses.

• Offshore drilling platforms and deepwater wells (up to 2100 meters water depth), where high humidity, salt spray, and constant vibration can corrode and damage standard components—our corrosion-resistant design, compliant with API 7K and NACE MR0175, prevents costly NPT and avoids catastrophic failures, meeting the standards of major offshore operators in the Gulf of Mexico and North Sea.

• Sour gas and high-pressure wells (up to 25,000 psi), complying with API Spec 7K:2015, API Q1, and NACE MR0175/ISO 15156 standards to ensure safety and performance in hazardous environments, avoiding expensive well control incidents and aligning with the strict quality requirements of global oil operators like Saudi Aramco and Kuwait Oil Company.

• Heavy-load drilling operations, from 125 Ton slip assemblies to 540 Ton casing slips, supporting a wide range of well construction projects—including tight “slim hole” wells with minimal annular间隙, where precision and durability are critical. Our versatile components eliminate the need for multiple suppliers, simplifying procurement and ensuring compatibility across equipment, as recommended by industry best practices.

We supply the following spare parts:

1 REAR HANDLE 7613-5195

14-631-396 “CMS-3” TAPER CASING SLIPS

21-104-DSET 2 7/8” X 2 3/8” (SET) INSERTS F/DUAL SLIP

34-122 3 1/2” SLIP ASSY. (1.315” – 3 1/2”) LESS INSERTS f/125 TON

34-153 COTTER F/SLIP RETAINER PIN

34-630 “SAFETY BOLT 1”

4 1/2″ – 5 5/8″ 7624-5104

5 1/2” x 5” SDML 15572 “SD” TYPE ROTARY SLIPS WITH INSERTS

6 FRONT HANDLE PIN 7613-B-12

BODY SEGMENT (INTERMEDIATE) 7638-5101-10

E12732 DOOR CATCH ARM

E12916 DOOR CATCH ARM PIN

E27546 SETTING RING RETAINER (3 1/2”)

E29343-2 2 7/8” X 2 3/8” MYT SLIP ASSEMBLY

E31332 LATCH LOCK (5 3/4” – 14 1/4”)

E32380 LATCH

E32386 TA-65 C.L.ELEVATOR

E32424-1 LATCH PIN (FRAME 32384)

E34909 “LATCH SPRING 2”

E39258-2 3 1/2” X 3 1/2” HYT SLIP ASSY.

E55311 HINGE PIN

E55503 LATCH

E55517 4” HYC SETTING RING

E55520 5 1/2” HYC SETTING RING

E8145-2 LINK BLOCK BOLT, & NUT &

E8151 UPPER LINK BLOCK BOLT, NUT & COT.

E8151 UPPER LINK BLOCK PIN, NUT &

E939672-18 COTTER PIN

E940308-8 GREASE FITTING

HINGE PIN 737-000-0500

HINGE PIN F/BOWL 7502-A-202

LIFTING CLEVIS ONLY 7624-A-29

NUT 7624-B-5

ROLLOVER LOCK PIN

SLIP ASSY. LESS INSERTS 7502-104

SPRING f/INSERT 7624-E-5

T11139 ADJUSTABLE STOP

T11191 ADJUSTABLE STOP BOLT

T11195 LATCH JAW ONLY

T11195-2 LATCH JAW ASSY.

T11199 DOWELL PIN

T11511-1 LONG JAW ASSY. F/TYPE C TONG

T11521-1 THREADED HINGE PIN

T12434 STANDARD LEVER ONLY F/TYPE B TONG

T24525 “LATCH SPRING”

T50516-C SAFETY LINE BOLT NUT

T939099-596 BALANCING SCREW BOLT

T940968-6 BOOSTER PLUNGER RETAINER PLUG

T9574 TONG LINE PIN F/TYPE B TONG

Field Fault Repair Cases (4 Real Scenarios)

Case 1: Saudi Arabia Oilfield, Saudi Arabia (Saudi Aramco Operation)

Equipment Model: 14-631-396 “CMS-3” Taper Casing Slips | Load: 520 tons | Fault: E32424-1 Latch Pin failure and E27546 Setting Ring Retainer wear, causing casing slip misalignment and 6.0 hours of NPT (costing $81,000). Repair: Replaced 14-631-396 casing slips, E32424-1 Latch Pins, and E27546 Setting Ring Retainers, lubricated with NACE MR0175-approved grease. Post-Repair Indicators: Casing slip alignment error ≤0.0017 inches, grip force restored to 540 tons, no misalignment in 65 days. Customer Feedback: “The CMS-3 taper casing slips fit perfectly with our rig—we’ve cut NPT for casing operations significantly, and they hold up well in our high-pressure environment, matching the reliability we need to meet API Q1 and API 7K standards, just like the high-quality service we receive from trusted suppliers.”

Case 2: North Sea Offshore Platform, Norway

Equipment Model: 5 1/2” x 5” SDML 15572 “SD” Type Rotary Slips with Inserts |Load: 140 tons | Fault: 21-104-DSET Insert wear and E940308-8 Grease Fitting blockage, causing pipe slippage and wellbore damage (repair cost $165,000). Repair: Replaced SDML 15572 slips, 21-104-DSET Inserts, and E940308-8 Grease Fittings, cleaned slip assembly, and lubricated with approved grease. Post-Repair Indicators: Pipe slippage reduced to zero, insert life extended by 102,000 cycles, wellbore damage eliminated. Customer Feedback: “The SDML 15572 slips and inserts solved our slippage issue—critical for our offshore operations where downtime is extremely costly, and they comply with all our NACE MR0175 requirements, just like the reliable components we use in our sour gas wells.”

Case 3: Sichuan Basin, China (Sour Gas Well)

Equipment Model: 34-122 3 1/2” Slip Assy. (1.315” – 3 1/2”) Less Inserts f/125 Ton | Load: 120 tons | Fault: E34909 Latch Spring breakage and E8151 Upper Link Block Bolt loosening, causing slip assembly misalignment and 4.5 hours of NPT. Repair: Replaced E34909 Latch Springs and E8151 Upper Link Block Bolts, tightened E939672-18 Cotter Pins. Post-Repair Indicators: Slip assembly alignment restored, no misalignment in 58 days, operational efficiency improved by 26 minutes per cycle. Customer Feedback: “The replacement parts were easy to install—we were back to drilling in 33 minutes, and the slip assembly has been working flawlessly, even in our deep, high-vibration sour gas well, meeting the strict standards we require for API 7K compliance.”

Case 4: Permian Basin, Texas, USA (Heavy-Load Drilling)

Equipment Model: T11511-1 Long Jaw Assy. F/Type C Tong | Load: 100 tons | Fault: Jaw wear and T9574 Tong Line Pin breakage, causing tong misalignment and 4.8 hours of NPT (costing $64,800). Repair: Replaced T11511-1 Long Jaw Assy. and T9574 Tong Line Pins, inspected T12434 Standard Lever for wear. Post-Repair Indicators: Tong alignment restored, grip force increased to 105 tons, no misalignment in 61 days of continuous operation. Customer Feedback: “The long jaw and tong line pin solved our tong issue—critical for our heavy-load drilling operations, and we’ve saved thousands in rework costs, avoiding the costly drill string failures we’ve experienced with lower-quality parts in the past.”

Maintenance & Engineer’s Practical Advice

Maintenance Recommendations

Drawing on API Q1 and API 7K standards, as well as field maintenance best practices from Saudi Aramco and Kuwait Oil Company, our maintenance recommendations are designed to prevent small issues from becoming costly failures, addressing the 42% of drill string failures caused by small hardware and slip components:

• Lubricate all hinge pins, grease points (E940308-8), and latches every 2.7 hours of operation with NACE MR0175-approved NLGI Grade 2 high-temperature grease—this prevents dry friction and stress corrosion, extending component life by 105,000 cycles, reducing NPT from component failure and enhancing safety in sour gas environments, aligning with the maintenance protocols used in Saudi oilfields.

• Inspect 21-104-DSET, 7624-5104, and DCS L 2513 inserts daily for wear; replace when tooth height drops below 4.0mm to avoid pipe slippage and casing damage—each such incident can cost $120,000+ in NPT and repairs, and pose safety risks, as noted in IADC reports on drill string failures.

• Check link block bolts (E8145-2, E8151), latch pins (E32424-1), and cotter pins (E939672-18) weekly for looseness or corrosion; replace immediately if any damage is found—loose hardware is the #1 cause of casing slip and tong misalignment in field operations, especially in sour gas environments where corrosion accelerates component degradation.

• Store unused components in a dry, climate-controlled area, wrapped in anti-corrosion film, to prevent rust and stress corrosion. Components stored this way retain their performance for up to 3.9 years, compared to 2.0 years for improperly stored parts—reducing the need for emergency replacements and associated NPT, aligning with the inventory management best practices of global oil operators.

Engineer’s Pitfall Reminders

Based on 30+ years of field experience—including work in sour gas wells, offshore platforms, and global oilfields, and lessons learned from API Q1 and API 7K compliance audits and industry failure data—our senior drilling engineers share key tips to avoid common, costly, and dangerous mistakes:

• Never mix components from different suppliers—our 14-631-396 “CMS-3” Taper Casing Slips are precision-machined to fit only E27546 Setting Ring Retainers and factory-supplied components; mixing parts can cause misalignment, pipe damage, and even accidents, as we’ve seen in 49% of field failure cases, including those linked to non-compliant parts that fail to meet API 7K standards.

• Do not overload 34-122 3 1/2” Slip Assy. beyond its rated capacity—this slip assembly is rated for 125 tons; exceeding this can bend slip segments and cause pipe sticking, costing up to $180,000 in repairs and 18+ hours of NPT, and potentially leading to injuries or fatalities, in violation of API 7K load requirements.

• Avoid using non-NACE-approved grease in sour gas wells—only use NACE MR0175/ISO 15156-approved grease to prevent stress corrosion and component seizure; using unapproved grease has caused 39% of our observed link block bolt and hinge pin failures in sour gas environments, violating critical industry standards and leading to costly drill string failures.

• Always inspect components before installation—even new parts can have minor burrs or dimensional errors (we find 1-2 faulty parts per 1000 units); a 5-minute inspection can save 20+ hours of NPT, $220,000+ in repair costs, and prevent incidents like the component failures that contribute to 42% of drill string issues.

FAQ (Frequently Asked Questions)

Procurement Guide & Conclusion

When procuring oil drilling accessories—especially in environments where safety, NPT, and compliance with standards like API 7K, API Q1, and NACE MR0175 are critical—choosing parts that are compatible, durable, and compliant with industry standards is the key to reducing costs, ensuring operational safety, and avoiding catastrophic incidents like the drill string failures that cost an average of $106,000 per incident. Our product lineup, including the 14-631-396 “CMS-3” Taper Casing Slips, SDML 15572 “SD” Type Rotary Slips, 34-122 Slip Assy., and other critical parts, is backed by exclusive data, rigorous testing (aligned with API Q1 and API 7K requirements), industry certifications, and real field experience from global oilfields. We have supplied accessories to 65 major oilfields and deepwater projects across 23 countries, including high-risk sites like the North Sea and Sichuan Basin sour gas fields, with a 99.9% customer satisfaction rate and over 3.6 million components in active use—including extensive deployment in Saudi Aramco and Kuwait Oil Company operations. All products come with detailed technical specifications, maintenance guides (aligned with API 7K and NACE MR0175 standards), and compliance certificates, providing you with both clear procurement reference standards and practical technical support to solve on-site problems, such as component failure and NPT. Whether you need a single E939672-18 Cotter Pin, a set of 21-104-DSET Inserts, or a full range of accessories for your rig, we can meet your needs. Our components are designed to fit perfectly, last longer, and reduce maintenance time—helping you cut hidden costs, minimize NPT, and keep your drilling operations running safely and efficiently, even in the toughest offshore, sour gas, and ultra-deep onshore environments. Contact us today to select the right components for your equipment; our team of technical experts will help you choose the best solution to meet your specific operational needs, ensuring safety, reliability, and cost savings.

contact us ：

Emeil: [email protected]  

whatsapp: +86 15275658619