Hi-Torque - Heavy Duty Clamp The strongest worm-gear clamp made in the world today. Withstands more than 3 times the SAE torque requirements for Type F worm-gear clamps. Eight screw-threads are engaged in the band simultaneously for incredible torquing drive (over 150 in.lbs.), sealing pressure, and vibration resistance.
- Highest strength worm-drive clamps made.
- 3 times stronger than other clamps.
- Eliminates double and triple clamping.
- 100% stainless steel -- greater corrosion resistance.
Heavy Duty Clamps - Bigger, heavier and stronger than our premium aircraft-grade Aero-Seal
Standard Series -- (HTM - - - Series)
Made in a range of stock sizes for convenient adjustment around standard diameters (typically in OEM or other production assembly work).
Liner Series -- (HTM - - - L Series)
Identical with HTM series except that the single-piece band is extended underneath the adjustment slots to protect silicone or other soft-surface materials.
Multiples Sizes (HP - - - Series)

This special series of Hi-Torque clamps offers a greatly expanded working diameter range by adding extra perforations to the band: eg. HP 4 covers working diameters normally covered by HTM-500, HTM-550 and HTM-600.  Only 4 sizes covers working diameters from 1-1/4" (32 mm) to 9-1/8" (232 mm).

STOCK NUMBERS
EFFECTIVE DIAMETER RANGE
HTM---Standard
HTM---L Liner
Min.
Max.
in.
mm.
in.
mm.
HTM-175
HTM-175 L
1
25
1-3/4
44
HTM-200
HTM-200 L
1-1/4
32
2-1/8
54
HTM-250
HTM-250 L
1-3/4
44
2-5/8
67
HTM-300
HTM-300 L
2-1/4
57
3-1/8
79
HTM-350
HTM-350 L
2-3/4
70
3-5/8
92
HTM-400
HTM-400 L
3-1/4
83
4-1/8
105
HTM-450
HTM-450 L
3-3/4
95
4-5/8
118
HTM-500
HTM-500 L
4-1/4
108
5-1/8
130
HTM-550
HTM-550 L
4-3/4
121
5-5/8
143
HTM-600
HTM-600 L
5-1/4
133
6-1/8
156
HTM-650
HTM-650 L
5-3/4
146
6-5/8
168
HTM-700
HTM-700 L
6-1/4
159
7-1/8
181
HTM-750
HTM-750 L
6-3/4
172
7-5/8
194
HTM-800
HTM-800 L
7-1/4
184
8-1/8
206
HTM-850
HTM-850 L
7-3/4
197
8-5/8
219
HTM-900
HTM-900 L
8-1/4
210
9-1/8
232

STOCK NUMBERS
EFFECTIVE DIAMETER RANGE
Min
Max
in.
mm.
in.
mm.
HP 2
1-1/4
32
2-5/8
67
HP 3
2-1/8
54
4-1/8
105
HP 4
4
102
6-1/8
156
HP 5
6-1/8
156
9-1/8
232