Product details

SMA 2.9 / SQUARE FLANGE FEMALE RECEPTACLE WITH CYLINDRICAL CONTACT

Name: R127840021
SKU: R127840021

China-sourced compatible alternative — fit confirmed by drawing/spec review.

Part number (MPN)

R127840021

Impedance

Frequency

Interface

SMA 2.9 (K)

Need a custom version from drawing?

We coordinate supplier-qualified RF connector and cable assembly sourcing from drawings, samples, or BOM. Typical production lead time is 3–6 weeks after drawing/spec review; feasibility, MOQ, and fit are confirmed by RFQ.

Custom RF cable from drawing →

WhatsApp — Quick Reply

Lead time: 3–6 wks | MOQ: 200+ pcs

Before RFQ Clear inputs speed up review. ⌄

• Share the reference MPN and source brand if it matters.
• Add the BOM and volume split for production projects.
• Attach the drawing or the key fit requirements.

How we review alternatives

Image

Click image to enlarge.

Specifications

R127840021

Specifications for R127840021
Interface	SMA 2.9 (K)
Interface	JACK
Interface	Connectors
Impedance	50
Frequency (max)	40
Gender	FEMALE
Termination	CYLINDRICAL
Mounting	4 HOLE FLANGE
Body Plating	PASSIVATED
Termination	GOLD 1.3 OVER NICKEL 2
Model	PANEL RECEPTACLE
Geometry	STRAIGHT

Show 1 more specs

Mating System	SCREW-ON

Description

Current reference data for R127840021: SMA 2.9 (K) · 50 · 40. The catalog currently lists the configuration as: CYLINDRICAL. Impedance is listed as 50. If that parameter is critical, confirm it again in RFQ. Frequency is listed as 40. The real operating limit still depends on the assembly, mating pair, and application context. For higher-frequency projects, include the drawing, cable path, and critical requirements in the first RFQ. Mounting is listed as 4 HOLE FLANGE. If panel, bulkhead, or flange constraints matter, send the dimensions with the RFQ. Use this page to shortlist before RFQ, not as the final sign-off.

Use this page to shortlist before RFQ. MOQ 200+ custom production and supply path are confirmed after drawing/spec/BOM review; no spot stock is assumed.

Request Quote (RFQ)

Cstone is a professional factory—not a trading company—specializing in RF and coaxial connectors, adapters, and cable assemblies, including N-type, BNC, SMA, SMP, SSMB, MMCX, and more. We manufacture custom connectors to 2D drawings or samples; fit, MOQ, lead time, and production details are confirmed by RFQ. Factory-made production to 2D drawings or samples; MOQ 200+ and typical 3–6 week lead time are confirmed after drawing/spec/BOM review. Physical inventory is not promised; production details are confirmed by RFQ.

Drawing / spec review MOQ / lead-time check RF connectors Adapters Cable assemblies

Why work with us?

Form-Fit-Function compatibility confirmed by drawing/spec review
Commercially competitive alternative for replacement and sourcing projects
MOQ 200+ and lead time confirmed by model, quantity, and supply path

Working hours: 10:00–20:00 (Beijing Time, UTC+8)

We typically reply within 1 business day (subject to workload and time zones).

Need a brand replacement workflow? Open the general brief → Need an approved alternative or cost-down workflow? Open the procurement brief →

Related RF sourcing routes

If this MPN is only a reference point, continue with a replacement, equivalent, adapter, or drawing-based cable assembly review.

Brand replacement briefs SMA alternatives from China BNC connector equivalents N Type RF replacement Custom RF cable from drawing

Open contact form

Engineer checklist (key parameters)

Interface Connectors

Gender FEMALE

Impedance 50

Frequency (max) 40

Mounting 4 HOLE FLANGE

Termination CYLINDRICAL

If these parameters are critical, include them in the RFQ.

FAQ

What connector interface/type does R127840021 use?

According to our catalog data, R127840021 lists the interface/type as: SMA 2.9 (K). To confirm mechanical fit, send an RFQ and we will validate against your drawing/spec.

What mounting style does R127840021 use?

Our catalog lists the mounting style for R127840021 as: 4 HOLE FLANGE. If you have panel/bulkhead/flange constraints, attach a drawing in the RFQ.

Similar Connectors

Related models:

9231-1553-006

SMA / STRAIGHT JACK FEMALE CLAMP TYPE FOR 5/50 S GOLD CAPTIVE CONTACT

View details →

FGG.3T.306.CLAC65Z

T - Small Outdoor keyed Series connector

View details →

A39T85-85S-

SMA plug right angle to TNC jack bulkhead using .085 conformable

View details →

FGL.2T.303.CLLC60

T - Small Outdoor keyed Series connector

View details →

PHG.3T.302.CLLK12

T - Small Outdoor keyed Series connector

View details →

9408-1113-002

SMA / STRAIGHT JACK FEMALE GOLD CAPTIVE CONTACT

View details →

MPN Search Supports exact, prefix, and partial matching. ⌄

Supports exact, prefix, and partial matching.

000-10400 000-1 00010400

Disclaimer

Manufacturer names, trademarks, symbols, and part numbers are used for identification and cross-reference only. Cstone Technology operates its own factory for RF/coaxial connectors, adapters, and cable assemblies and is not a trading company or affiliated with the original brands. Trademarks remain the property of their respective owners. Final suitability is confirmed by drawing/spec review during RFQ.