API 7-1 High-Grade Alloy Steel Drill Pipe Fishing Tools Junk Sub / Taper Tap/ Die Collar
Descriptions of Taper Taps & Die Collars:

Fishing tools taper taps and die collars are manufactured from high-grade alloy steel and cemented to ensure the highest strength. They are available in a wide range of sizes, and can be equipped with different types of guides.
The Taper Tap is a special internal catch fishing tool that engages with dropped tubular objects such as drill pipes and tubes by tapping threads on the object surfaces. It is a highly effective tool in the fishing of dropped tubular objects with couplings especially when the tapered threads engaged with the fish couplings. The taper tap can be used for different fishing operations when equipped with left hand threaded or right hand threaded drill pipes and tools. The taper tap is made from high strength alloy steel, heat treated for maximum strength and ruggedness. The cutting threads are hardened (wicked) with cutting grooves to ensure proper tapping of threads on the fishes.
Type | OD (mm) | ID (mm) | Fishing thread size(mm) | Fishing hole Diameter range(mm) | Total length (mm) |
Taper samll diameter | Taper big diameter | Taper length | | |
GZ-NC26 | 86 | 13.5 | Φ38 | Φ60 | 352 | 43~55 | 560 |
GZ-NC26 | 86 | 20 | Φ52 | Φ70 | 288 | 57~65 | 535 |
GZ-NC31 | 105 | 20 | Φ52 | Φ70 | 288 | 57~65 | 535 |
GZ-NC31 | 105 | 25 | Φ70 | Φ83 | 208 | 75~78 | 475 |
GZ-NC31 | 105 | 20 | Φ43 | Φ70 | 432 | 48~65 | 800 |
GZ-NC38 | 121 | 20 | Φ55 | Φ82 | 432 | 60~77 | 800 |
GZ-NC50 | 156 | 25 | Φ86.5 | Φ108 | 344 | 89~103 | 800 |
GZ-3 1/2REG | 108 | 18 | Φ33.7 | Φ65 | 500 | 38~60 | 800 |
GZ5 1/2FH | 178 | 25 | Φ83.5 | Φ108 | 392 | 89~103 | 800 |
The die collar, also known as skirted taper tap, is a special external fishing tool that engages with the dropped tubular objects such as drill pipes and oil tubing, by tapping on the external wall of the objects. It can be used in fishing cylindrical objects without inner bore or stuck inner bore. The die collar is a long cylindrical integral structure composed of a Sub, a Tap body with cutter threads in the cone shaped interior. The die collar is made of high strength alloy with cutting grooves in the fishing threads.
Model | Product Code | Fishing OD of big end (mm) | Fishing OD of small end (mm) | Max. OD (mm) | OD of joint (mm) | Overall length (mm) | Catch size (mm) |
MZ55×40-NC26 | L20-02000 | 55 | 40 | 86 | 86 | 410 | 48 |
MZ68×50-NC26 | L20-02001 | 68 | 50 | 95 | 86 | 550 | 60 |
MZ80×62-NC26 | L20-02002 | 80 | 62 | 114 | 86 | 560 | 73 |
MZ96×74-NC31 | L20-03000 | 96 | 74 | 127 | 105 | 640 | 89 |
MZ110×90-NC38 | L20-05000 | 110 | 90 | 143 | 121 | 610 | 102 |
MZ122×102-NC38 | L20-05001 | 122 | 102 | 162 | 121 | 620 | 114 |
MZ135×110-NC50 | L20-09000 | 135 | 110 | 175 | 168 | 690 | 121 127 |
MZ148×128-NC50 | L20-09001 | 148 | 128 | 190 | 168 | 630 | 140 |
MZ167×140-NC50 | L20-09002 | 167 | 140 | 203 | 168 | 740 | 152 159 |
MZ178×153-6 5/8 REG | L20-19000 | 178 | 153 | 211 | 203 | 720 | 165 168 172 |
MZ190×166-6 5/8 REG | L20-19001 | 190 | 166 | 219 | 203 | 720 | 178 |
MZ210×185-6 5/8 REG | L20-19002 | 210 | 185 | 247 | 203 | 760 | 197 203 |
MZ239×216-7 5/8 REG | L20-20000 | 239 | 216 | 280 | 241 | 720 | 228 |
MZ251×229-7 5/8 REG | L20-20001 | 251 | 229 | 290 | 241 | 720 | 241 |


Complete fishing tools we supply:
We provide all kinds of fishing tools at various sizes. The fishing tools are produced and inspected strictly under API Spec 7, including Safety Joint, Fishing Magnet, Overshots, Releasing Spear, Fishing Jar (3 1/2" to 9 1/2" OD), Fishing Multifunction, Casing Spear, Taper Taps, Die Collars, Jar Intensifier (3 1/2" to 9 1/2" OD), Junk Sub, Hydraulic Junk Retriever, Mill Shoes, Reverse Circulating Junk Basket etc.

If any needs, pls contact us freely:
Dongying OilMan Machinery Equipment Co.
Address: North Two Road, Dongying City, Shandong Province, China.
Mob/whats app/we chat:+86 13475294399
*Email: christal@oilmancn.com