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Kupo KG014512 2.3in Round Knob 1/4in-20 Female — main product image
Kupo

Kupo KG014512 2.3in Round Knob 1/4in-20 Female

★★★★★5.0 (1 reviews)
2.3in4in

Lock down your heaviest accessories with confidence — Kupo's oversized 2.3-inch knob delivers the torque and grip that standard knobs can't match.

$9.95*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

When a standard knob starts to feel like a liability — slipping under the weight of a heavy monitor arm, a loaded magic arm, or a rigged accessory that gets repositioned dozens of times in a shoot day — the Kupo KG014512 is the part that solves the problem. The 2.3-inch round plate isn't just cosmetically oversized; the larger diameter directly translates to more torque per unit of hand effort, which matters when you're cinching down hardware repeatedly throughout a session. The integrated 1/4"-20 female thread keeps it broadly compatible across the standard photographic and grip ecosystem.

The three locking set screws are the engineering feature that separates this knob from standard alternatives. Once your accessory is seated and the knob is tightened, the set screws engage the shaft to resist both rotational drift and axial pull — the two failure modes that cause accessories to shift position under load. The aluminum alloy body keeps the hardware lightweight without sacrificing the structural integrity needed to handle heavier mounted loads. For studio builds and location rigs where any unwanted movement during a shot is unacceptable, this knob is a straightforward, confidence-building upgrade to standard mounting hardware.

Key Features

SPECIFICATIONS: Oversized round locking knob with 2.3" diameter plate and integrated 1/4"-20 female thread.

INCREASED HOLD: Larger diameter provides greater torque and holding strength for heavier accessories.

ADDED SECURITY: Three locking set screws help prevent unwanted movement under load.

CONSTRUCTION: Lightweight aluminum build balances durability with easy handling.

USE CASES: Ideal for clamps, arms, and rigging setups requiring enhanced locking performance.

Specifications

Diameter
2.3 inches
Thread Type
1/4 inch-20 Female
Locking Mechanism
Three locking set screws
Construction Material
Aluminum

Pros & Cons

👍 Pros

  • The 2.3-inch diameter gives noticeably more torque and grip than standard small knobs, making confident tightening much easier even with gloved hands on location.
  • Three locking set screws prevent loaded accessories from rotating or working loose during a long session or when the rig is under repeated adjustment.
  • Lightweight aluminum construction means this knob adds minimal weight to rigs where cumulative hardware weight becomes a factor across a full day.
  • The integrated 1/4"-20 female thread engages reliably with the wide range of accessories using the standard photographic thread specification.
  • Matte aluminum finish resists internal reflections — relevant when mounting accessories near sensitive imaging setups.

👎 Cons

  • The 2.3-inch plate diameter may be physically awkward in very tight rigging configurations where adjacent hardware limits hand access to the knob.
  • The knob only offers a 1/4"-20 female thread — setups requiring 3/8"-16 connections need a separate knob or adapter.
  • Aluminum, while durable, will show wear marks and thread degradation faster than steel under very frequent high-torque use cycles.
  • The set screws require a hex key for full adjustment, which adds a small tool dependency to your rigging kit.

Frequently Asked Questions

The knob has a 1/4"-20 female thread, which is the standard photographic thread found on cameras, ballheads, clamps, magic arms, and a wide range of mounting accessories. Any accessory with a 1/4"-20 male threaded shaft will engage with this knob securely.
The set screws engage with the mounted shaft to resist rotation and axial movement under load. Once you've threaded your accessory in and tightened the main knob, the set screws add a secondary lock that prevents the connection from walking loose during extended use or when supporting heavier accessories.
Yes. The larger diameter gives you significantly more torque with less hand effort — particularly useful when wearing gloves on an outdoor shoot, or when you need to make repeated quick adjustments and tightenings throughout a session without fatiguing your fingers.
The aluminum construction and locking set screws are designed for heavier accessories than standard knobs handle. While Kupo doesn't publish a specific weight rating, the design intent covers the kind of loads found in typical grip and rigging setups — heads, arms, and multi-pound accessories.
Aluminum alloy at this knob's size provides a strong strength-to-weight ratio. It handles the compressive and torsional loads of tightening without deforming under normal use. It won't corrode like steel in humid environments and is lighter to carry through a full day of rigging work.

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