CURRENT and older Style Counterweight Shafts, Safety Stop and Optional Extension

Current Style 1.875" Diameter Counterweight Shafts and One-Piece Safety Stop

1.875" and 1.125" Diameter Counterweight Shafts Requiring Safety Knobs and Washers

Current Style 1.875" Diameter Shafts Requiring the One-Piece Safety Stop for 900, 1100, 1200, 1600 and Mach1GTO Mounts
with 5, 10, 18 and 24 lb. Counterweights

This style counterweight shaft with its one-piece washerless safety stop ships with the 1100GTO and 1600GTO and began shipping with 1200GTO mounts in May, 2006 and continued with the 900GTO's that began shipping in January, 2007. An optional shaft was also introduced for the Mach1GTO at the beginning of 2007. By machining the same size threads at all connection points, the various pieces work together as a system and provide an enhanced level of convenience and versatility to your 900, 1100, 1200, 1600 or Mach1GTO mount. The one-piece, machined, aluminum, washerless safety stop (shown left) is easier to use than the older knob and washer, especially in the dark, and you don't have a washer to drop and / or lose. A newly added Delrin washer (F0020) (shown right) helps prevent the counterweight shaft from seizing against the mount's CW shaft adapter. The extension eliminates the need for a separate longer shaft for mount owners with heavier equipment loads.

     

PLEASE NOTE:

     

19.5" x 1.875" Diameter Counterweight Shaft
(M12601-D)

At 19.5" in length (18.5" usable), this is the standard shaft for the 1200 and 1600 series of mounts, and the optional "long" version for the 900 and 1100 series. It, however, sets a new standard for all with its perfectly matched components.

The threads on the mount end of the shaft have a lead-in to help prevent cross threading. We machined matching female threads into the far end of the counterweight shaft, to accept the handy 9" extension (M12675) so that you can extend the shaft to accomodate additional counterweights for a larger scope. The washerless Safety Stop (M12676) is a required accessory for this counterweight shaft.

Like its predecessors, this 1.875" diameter counterweight shaft is precision machined from solid 303 stainless steel. It is both beautiful and robust and has a soft luster that belies its rigid strength. This 14 lb. (6.4 kg) shaft can hold up to seven 24 lb. counterweights (168 lb.). It is compatible with our 5 lb. (5SCWT), 10 lb. (10SCWT), 18 lb. (18SCWT) and 24 lb. (24SCWT) counterweights.

The "D" version of this shaft can now be used on 900 series mounts that are equipped with shaft encoders. It may, of course, also be used on 1200 series mounts with encoders.

This shaft is recommended for: the 1600GTO and all 1200 models that have been produced.

M12601-D$120.00 in stockAdd M12601-D To My Cart

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14" x 1.875" Diameter Counterweight Shaft (M9404-A)

This Counterweight Shaft is the standard shaft for 1100GTO and all 900GTO mounts shipped after January 2007. It can also be used as an optional "heavyweight" shaft for the Mach1GTO, or even as an optional "lightweight" shaft for the 1200 or 1600 for those times that you remove the big scope and put a small instrument on the big mount.

The threads on the mount end of the shaft have a lead-in to help prevent cross threading. The lead-in was shortened slightly from the older style M9404 so that this shaft can once again be used on a 900 or 1200 series mount with shaft encoders. We machined matching female threads into the far end of the counterweight shaft, to accept the versatile 9" extension (M12675) so that you don't have to order a longer shaft to accomodate a larger scope. The washerless Safety Stop (M12676) is a required accessory for this counterweight shaft.

This 1.875" diameter counterweight shaft is precision-machined from solid 303 stainless steel as are all the counterweight shafts we produce. And, like all our other counterweight shafts, it's just downright pretty! It weighs in at 10.5 lb. (4.8 kg) with the safety stop and its 12.875" usable length can hold up to five 24 lb. counterweights (120 lb.). It is compatible with our 5 lb. (5SCWT), 10 lb. (10SCWT) and 18 lb. (18SCWT) and 24 lb. (24SCWT) counterweights.

This shaft is recommended for: the 1100GTO, and all 900 models (HDA, QMD, SMD and GTO) that have been produced. It may also be used with the Mach1GTO.

M9404-A$99.00 in stockAdd M9404-A To My Cart

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10.7" x 1.875" diameter Counterweight Shaft (M1053-A)

This optional Counterweight Shaft was designed specifically to fit into the declination axis of the Mach1GTO to create a very compact configuration for travel. The shaft has a usable length of 9.625". A 5 lb. Counterweight (5SCWT) was also designed to add versatility and flexibility for the Mach1GTO's lighter loads.

The threads on the mount end of the shaft have a lead-in to help prevent cross threading. We machined matching female threads into the far end of the counterweight shaft, to accept the convenient 9" extension (M12675) so that you don't have to order a longer shaft for a larger scope. The washerless Safety Stop (M12676) is a required accessory for this counterweight shaft.

Like all our shafts, this 1.875" diameter counterweight shaft is precision-machined from solid 303 stainless steel. It weighs 7.7 lb. (3.5 kg) and can hold up to 64 lb. of counterweights (three 18 lb.and one 10 lb. for instance). It is compatible with our 5 lb. (5SCWT), 10 lb. (10SCWT) and 18 lb. (18SCWT) and 24 lb. (24SCWT) counterweights. You've probably never thought of the word "cute" when describing such a mighty little counterweight shaft, but...

We have added a 5/16-18 x 3/4" Socket Head Cap Screw to the end of the shaft to make it easier to remove from the declination axis of your Mach1GTO after stowing it inside for compact transport. Since the shaft doesn't leave much gripping surface on the other end, we added this feature so that your shaft won't end up "stuck" inside the declination axis. Just use the 1/4" Hex Key supplied with your mount and turn as shown.

This shaft is recommended for: the Mach1GTO. Although it was designed for the Mach1GTO, this shaft can also be used as a lightweight "shorty" for the 1100 and 1600 or the 900 and 1200 mounts and will fit those mounts even when they are equipped with shaft encoders. It can also be used with the 600 series mounts, but NOT if the mount is equipped with shaft encoders.

M1053-A$89.00 in stockAdd M1053-A To My Cart

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One-Piece Washerless Safety Stop for Current 1.875" Diameter Counterweight Shafts (M12676)

This handy one-piece, washerless safety stop is machined from a solid piece of aluminum and anodized black. It fits in the end of all of the current style 1.875" diameter counterweight shafts: the 19.5"- (M12601-D), 14"- (M9404-A) and 10.7"- (M1053-A), as well as the counterweight shaft extension (M12675). It also fits into your mount's Declination Axis itself for storage and transport.

The Safety Stop's large threads and washerless, one-piece design make it a pleasure to use, especially in the field. It screws into the shaft-end of the declination axis for storage and transport, providing both protection for your mount and a place where it won't get lost! Because it will turn, be careful if using the Safety Stop as a handle when lifting your Dec. axis.

This safety stop is required for: all mounts that have the current style 1.875" diameter counterweight shaft.

M12676$30.00 in stockAdd M12676 To My Cart

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9.25" x 1.875" Diameter Extension (M12675)

The 9.25" Counterweight Shaft Extension completes the current 1.875" diameter counterweight shaft ensemble. It, of course, eliminates the need for a separate longer shaft for those of you with heavier instruments. Like the other current 1.875" diameter shafts, the 9.25" Extension uses the Washerless Safety Stop (M12676) to protect your toes. Its fit to the primary counterweight shaft is virtually seamless, so your weights will slide up and down smoothly.

The extension is beautifully machined from the same 303 stainless stock as the full counterweight shafts and adds another 8.5" of usable length to your counterweight shaft.It can be used to extend the 10.7" (M1053-A) and 14" (M9404-A) counterweight shafts as well as the 19.5" model (M12601-D) all shown above. The added length will accomodate 72 lb. of additional 24 lb. counterweights as well as allowing your current weights to be "levered out" for balancing. It is compatible with our 5 lb. (5SCWT), 10 lb. (10SCWT) and 18 lb. (18SCWT) and 24 lb. (24SCWT) counterweights. The extension itself weighs 6.6 lb. (3.0 kg).

The 9.25" Counterweight Shaft Extension has a shorter lead-in thread than the full counterweight shafts and should NOT be the piece that screws into the declination axis.

This shaft extension is recommended for: the 1100GTO, 1600GTO, all 1200 models and 900 models (HDA, QMD, SMD and GTO) that have been produced, but the mount must have the current style 1.875" diameter primary counterweight shaft. It may also be used with the Mach1GTO. provided that an optional 1.875" diameter shaft has been purchased.

M12675$72.00 in stockAdd M12675 To My Cart

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Counterweight Shafts that Require Safety Knobs and Washers

14" x 1.875" Diameter Counterweight Shaft - Older Style (M9404)

We still have a few of these 14" Counterweight Shafts (12.75" usable length) available, although they have been replaced with the newer style (M9404-A) on all new 900GTO mounts. These shafts have most of the same specs as the newer style 14" Counterweight Shaft (M9404-A), except that they require the Counterweight Shaft Safety Knob (SCWTKB) and larger Counterweight Safety Washer (M12009) sold separately below. They can NOT be used with the One Piece Safety Stop (M12676) . These shafts are compatible with our 5 lb. (5SCWT), 10 lb. (10SCWT) and 18 lb. (18SCWT) and 24 lb. (24SCWT) counterweights.

This shaft is recommended for: the 1100GTO and all 900 models (HDA, QMD, SMD and GTO) that have been produced. It may also be used with the Mach1GTO. Note: This counterweight shaft should NEVER be used with a 900 series mount that has shaft encoders in place. It may, however, be used with 1200 series mounts that have encoders.

M9404$45.00 in stockAdd M9404 To My Cart

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14.5" x 1.125" Diameter Counterweight Shaft (M8084-A)

This is the standard shaft that is shipped with the Mach1GTO. It is the same diameter - 1.125" - and uses the same counterweights - 6 lb. (6SLCWT) and 9 lb. (9SLCWT) - as the shafts for the 400 and 600E mounts. The end that attaches to the mount's declination axis was re-designed and incorporates a lead-in to start you out right and a shoulder to stop the shaft firmly against the counterweight shaft adapter without any binding.

The usable length is 13.625" and it will hold over 60 lb. of counterweights. The shaft itself weighs in at 4.1 lb. (1.9 kg) This shaft requires the Counterweight Shaft Safety Knob and smaller Counterweight Safety Washer (F516X112WF) shown below. It can NOT be used with the One Piece Safety Stop (M12676).

This shaft is recommended for: all 400, 600, 800 and Mach1GTO mounts produced. This counterweight shaft can be used on mounts equipped with shaft encoders.

M8084-A$60.00 in stockAdd M8084-A To My Cart

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Counterweight Shaft Safety Knob (SCWTKB)

This is the Counterweight Shaft Safety Knob that we have sold for years. It has a 5/16-18 thread and fits into all the counterweight shafts we have produced up until the current style 1.875" shafts were introduced in 2006. It is still the standard knob supplied with the Mach1GTO, and is the required knob for all 400, 600, 800 and all older 900 and 1200 mounts. Basically, if you do NOT have one of the current style shafts shown above, this is the knob for you!

This knob requires the use of one of the Safety Washers shown below. DO NOT use your mount without the Counterweight Shaft Safety Knob and the appropriate Counterweight Safety Washer!

Recommended for: All Astro-Physics mounts that have been produced.

Note: Shipping charges will apply unless shipped with another item valued at $20 or more.

SCWTKB$5.00 in stockAdd SCWTKB To My Cart

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Counterweight Safety Washers: Large (M12009) or Small (F516X112WF)

 

One of these two Safety Washers is required with the Counterweight Safety Knob shown above. Use the larger M12009 with the 1.875" diameter shafts. The smaller F516X112WF is used for the 1.125" diameter shafts. DO NOT use your mount without the Counterweight Shaft Safety Knob and the appropriate Counterweight Safety Washer!

  • M12009 - 5/16" ID x 2.25" OD Stainless Steel for 1.875" diameter shafts with 5, 10 and 18 lb. weights.
    Recommended for:
    900 & 1200 mounts
  • F516X112WF - 5/16" ID x 1.5" OD Stainless Steel for 1.125" diameter shafts with 6 and 9 lb. weights.
    Recommended for: Mach1GTO, 400, 600 and 800 mounts.

Note: Shipping charges will apply unless shipped with another item valued at $20 or more.
M12009$4.00 in stockAdd M12009 To My Cart

F516X112WF$2.00 in stockAdd F516X112WF To My Cart

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This page was last modified: July 1, 2013

Astro-Physics, Inc.
11250 Forest Hills Road, Machesney Park, IL  61115, U.S.A.
Phone: 815-282-1513   Fax: 815-282-9847