MP-安全卡瓦
MP 安全卡瓦用于卡持平接頭管柱和鉆鋌，有四種型號：MP-S型適用管徑為27/8-5inch，MP-M適用管徑為41/2-101/2.MP-L型適用管徑為157/8-193/8 inch，MP-XL適用管徑為193/8-361/8 inch。
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技術參數(shù)
| 型號 | 管柱尺寸 O.D(in) | 鏈節(jié)數(shù) |
| MP-S | 27/8-41/8 | 7 |
| 4-5 | 8 | |
| MP-R | 41/2-55/8 | 7 |
| 51/2-7 | 8 | |
| 63/4-81/4 | 9 | |
| 8-91/4 | 10 | |
| 91/4-101/2 | 11 | |
| MP-M | 101/2-111/2 | 12 |
| 111/2-121/2 | 13 | |
| 121/2-135/8 | 14 | |
| 135/8-143/4 | 15 | |
| 143/4-157/8 | 16 | |
| MP-L | 157/8-17 | 17 |
| 17-181/2 | 18 | |
| 181/8-193/8 | 19 | |
| MP-XL | 193/8-203/8 | 19 |
| 203/8-211/2 | 20 | |
| 21-225/8 | 21 | |
| 225/8-233/4 | 22 | |
| 233/4-247/8 | 23 | |
| 247/8-26 | 24 | |
| 26-271/8 | 25 | |
| 293/8-301/2 | 28 | |
| 35-361/8 | 33 |
