Nelson Photo & Video

Promaster Small Thread Adapter - 1/4"-20 female to 3/8"-16 male

Promaster Small Thread Adapter - 1/4"-20 female to 3/8"-16 male - Main image
$4.31 $6.95 In stock

Category: Support hardware

The Promaster Small Thread Adapter converts a 1/4"-20 female thread to a 3/8"-16 male thread, providing a reliable connection for support‑hardware applications.

  • Thread conversion: 1/4"-20 female to 3/8"-16 male.
  • Compact design for easy integration into tight spaces.
  • Made by Promaster, a recognized brand in photographic and video accessories.
  • Ideal for mounting accessories that require a larger male thread.
  • Fits standard equipment that uses 1/4"-20 and 3/8"-16 threading.
A final check before payment

Review your options, quantities and the final total before confirming.

Ordering for an occasion

Delivery times are estimates, so leave time before your occasion.

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

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

View policy
If plans change

Ask the store about your order before making return or refund arrangements.

Please contact us for the refund processing timeframe before returning an item.

View policy
Planning delivery

Review the available services for your destination.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Return arrangements

Contact the store first to check the conditions for your item.

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

View policy

Customer Reviews (4.8 / 5 · 5 reviews)

Joseph ★★★★★

The threads on this adapter are cut cleanly and screw on without any wobble. Used it to mount a quick-release plate to my new gimbal head, and the fit is perfect.

Mia V. ★★★★★

Needed this to attach my old tripod head to a newer monopod, and the brass threading felt solid and tightened perfectly without any wobble. It's a small piece, but it handles the weight of my DSLR and 70-200mm lens without any issues.

Riley ★★★★★

Finally got this adapter to mount my fluid head onto a different tripod plate, and the brass threads fit snug without any wobble. Exactly what I needed for a clean, secure connection between the two common sizes.