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CMI

SRACK1B SRACK3B SRACK4B
SRACK1B SRACK3B SRACK4B

Overview


SRACK1B
(#1482)

Front View Rear View Side View
Front View Rear View Side View

Technical Details

I acquired this rack from Barry Duncan at the 2016 Old Timers Reunion.

My CMI SRACK1B rack is 369 mm. tall, 103 mm. wide, 46 mm. thick, and weighs 784 g. The frame is made from 9.5 mm. stainless steel bent into shape, with an internal width of 35 mm. and a 27 mm. diameter welded eye twisted 90°. There are six hard-anodized aluminum brake bars, each 16mm tall and 22 mm. thick, with one rounded side and a rope grove on that side. The top bar is a 86 mm. long hyperbar with a 34 mm. tall, 9.5 mm. diameter pin. The remaining bars are 16 mm. in diameter. Allowing 45 mm. for the rope leaves 109 mm. for spreading the bars.

The second bar is printed with "Cmi" and "MBS" 10,000 lbs."

Comments

This rack is very well made. The hard anodizing should limit brake bar wear when used on clean ropes. The bars pivot on the closed side of the frame, as they should for safety.

CMI has made a number of CMI U-frame racks over the years, but I believe that this is one of their first of the more versatile J-frame racks.

The hyperbar is longer than necessary; in fact, I’d rather have a standard top bar and dispense with the hyperbar entirely.

CMI makes a SRACK2B with a straight eye. (i.e., not twisted 90°). I do not have one of these, but would prefer it since my harnesses are not designed for twisted eye racks.

Instructions Instructions

SRACK3B
(#1483)

Front View Rear View Side View
Front View Rear View Side View

Technical Details

I acquired this rack from Barry Duncan at the 2016 Old Timers Reunion.

My CMI SRACK3B rack is 272 mm. tall, 103 mm. wide, 46 mm. thick, and weighs 528 g. The frame is made from 9.5 mm. stainless steel bent into shape, with an internal width of 35 mm. and a 27 mm. diameter welded eye twisted 90°. There are six hard-anodized aluminum brake bars, each 16mm tall and 22 mm. thick, with one rounded side and a rope grove on that side. The top bar is a 86 mm. long hyperbar with a 34 mm. tall, 9.5 mm. diameter pin. The remaining bars are 16 mm. in diameter. Allowing 45 mm. for the rope leaves 26 mm. for spreading the bars.

The second bar is printed with "Cmi" and "MBS" 10,000 lbs."

Comments

This is a shorter rack that does not have much room for spreading the bars, so I view it as a constant friction device. Light cavers might find that it has too much friction.

Instructions Instructions

SRACK4B
(#1484)

Front View Rear View Side View
Front View Rear View Side View

Technical Details

I acquired this rack from Barry Duncan at the 2016 Old Timers Reunion.

My CMI SRACK4B rack is 281 mm. tall, 103 mm. wide, 26 mm. thick, and weighs 528 g. The frame is made from 9.5 mm. stainless steel bent into shape, with an internal width of 35 mm. and a 27 mm. diameter welded eye twisted 90°. There are six hard-anodized aluminum brake bars, each 16mm tall and 22 mm. thick, with one rounded side and a rope grove on that side. The top bar is a 86 mm. long hyperbar with a 34 mm. tall, 9.5 mm. diameter pin. The remaining bars are 16 mm. in diameter. Allowing 45 mm. for the rope leaves 26 mm. for spreading the bars.

The second bar is printed with "Cmi" and "MBS" 10,000 lbs."

Comments

This is another shorter rack that does not have much room for spreading the bars, so I view it as a constant friction device. Light cavers might find that it has too much friction. At least this one does not have the twisted eye.

The SBRACK3 and SBRACK4 are different sizes, but mine weight almost exactly the same amount.

Instructions Instructions