Counterweights for iEQ45, GEM45 and CEM40/60/70 (8027)

$64.35 ~~$99~~ In stock

Description

The newly designed 5kg (11lb) counterweight (CW) uses compression ring to lock the CW onto a CW shaft. Comparing to traditional "point contact" locking mechanism via a locking screw and a pin, the compression ring provides more secure locking method through distributed surface contact.

This CW is designed for following iOptron Mount:

CEM70/CEM70EC/CEM70G
CEM60/CEM60EC
GEM45/GEM45EC/GEM45G
CEM40/CEM40EC/CEM40G* (for late version with 28mm CW shaft)
iEQ45 Pro
iEQ45

Check your CEM40 mount CW shaft diameter before ordering.

It can be used for other mount with a 28mm diameter counterweight shaft.

The 2.5 kg (5.5lb) counterweight is designed for following iOptron mount:

Check your CEM40 mount CW shaft diameter before ordering.
It can be used for other mount with a 28mm diameter counterweight shaft.

Specifications

5kg

Weight:	5 kg (11 lbs)
Outer diameter :	148 mm (5.8")
inner diameter:	28.5 mm (1.12")
Height:	38 mm (1.5")
Locking mechanism:	Locking screw with compression ring
Locking screw thread size:	M8

2.5kg

Weight:	2.5 kg (5.5.)
Outer diameter:	118 mm (4.6 in.)
Inner diameter:	28.5 mm (1.12 in.)
Height:	25 mm (1 in.)
Locking mechanism:	Locking screw with pin
Locking screw thread size:	M8

Actual dimension, except inner diameter, may be different.

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Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.6 / 5 · 5 reviews)

Hazel U. ★★★★★ Oct 21, 2026

After struggling with a flimsy locking screw on my old counterweight, the compression ring on this one grips the shaft firmly without any wobble. It balanced my setup perfectly on the first try with no slipping.

Edward M. ★★★★★ Oct 19, 2026

The compression ring locks onto the shaft way more securely than the old set-screw style, so no more worrying about it slipping during a long imaging session. At 5kg it balances my CEM60 nicely with a scope and guide rig attached.

Michael ★★★★★ Oct 18, 2026

The compression ring locks onto the shaft much more securely than the typical point-contact screw, giving me real peace of mind with my heavy imaging setup. It slides on smoothly and feels solidly built for the 11-pound weight.