GJB599 Series II Low-Profile Bayonet Connectors (38999 Series II Type)

38999 Series II type · low-profile bayonet · 96 insert arrangements

GJB599 Series II is our 38999 Series II-type connector: a low-profile bayonet design with short, light shells for equipment where space and weight matter. It is built to GJB 599A Series II, with shell sizes 8 to 24 and 96 insert arrangements.

Coupling: Bayonet, low profile
Shell sizes: 8 to 24
Insert arrangements: 96
Contact sizes: 22D to 12 (5–23 A)
Temperature: −65 to +200 °C
Mating cycles: 500

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Key features

Low-profile bayonet design: short, light shells
Built to GJB 599A Series II, the Chinese counterpart of MIL-DTL-38999 Series II
Removable crimp and solder contacts; PCB contacts for board-mounted receptacles
EMI/RFI shielding; shielded plug version
Hermetic receptacles and bulkhead feed-through receptacles, leak rate ≤ 1 × 10⁻⁸ Pa·m³/s
Five key positions prevent mismating
Marine-environment (M) version in stainless steel or titanium, 500 h salt spray

Specifications

Electrical
Parameter	Value	Condition
Dielectric withstanding voltage, service rating M	1300 Vrms / 800 Vrms	Sea level / 21,000 m altitude, mated
Dielectric withstanding voltage, service rating N	1000 Vrms / 600 Vrms	Sea level / 21,000 m altitude, mated
Dielectric withstanding voltage, service rating I	1800 Vrms / 1000 Vrms	Sea level / 21,000 m altitude, mated
Dielectric withstanding voltage, service rating II	2300 Vrms / 1000 Vrms	Sea level / 21,000 m altitude, mated
Insulation resistance	≥ 5000 MΩ	Room temperature
Insulation resistance	≥ 1000 MΩ / ≥ 200 MΩ	High temperature, non-hermetic / hermetic
Insulation resistance	≥ 100 MΩ	After humidity
EMI shielding	45 dB at 1 GHz	Aluminum shells

Mechanical
Parameter	Value	Condition
Coupling	Bayonet
Durability	500 mating cycles	250 cycles for JY27484 shielded plugs
Shock	300 g, 3 ms

Environmental
Parameter	Value	Condition
Operating temperature	−65 to +200 °C	−65 to +175 °C for cadmium finish
Random vibration	100–1000 Hz, 1 g²/Hz (41.7 g rms)
Damp heat, cyclic	10 cycles × 24 h	GJB 1217A, type II
Hermetic receptacle leak rate	≤ 1 × 10⁻⁸ Pa·m³/s	0.1 MPa pressure differential
Operating altitude	≤ 30,480 m
Mold resistance	Grade 2, 28 days	GJB 150

GJB 599A Series II — Chinese specification for Series II low-profile bayonet connectors, the counterpart of MIL-DTL-38999 Series II.

Parameters not listed above — for example vibration level, leak rate or other environmental tests — can be tested to your requirements, including third-party testing.

Versions

Series code	Version	Notes
JY27473T	Plug
JY27484T	Shielded plug
JY27472T / JY27497T	Wall-mount square-flange receptacle, front / rear mounting
JY27513E / JY27508E	Box-mount square-flange receptacle, front / rear mounting
JY27474T	Jam-nut receptacle
JY27902T	Round-flange adapter receptacle
JY27476Y / 27477Y / 27478Y	Hermetic receptacles: wall mount / jam nut / solder mount
JY27472Y …C	Hermetic bulkhead feed-through receptacle
JY27…M	Marine-environment version (M)	Aluminum olive-drab cadmium (B), stainless (E) or titanium (TA) shells, 500 h salt spray; rated for acid salt spray, acid atmosphere and mold. Example: JY27472T14ME35PN.

Shell materials and finishes

Code	Shell material	Finish	Shell conductivity	EMI shielding	Temperature	Salt spray
F	Aluminum alloy	Electroless nickel	1 mΩ	45 dB at 1 GHz	−65 to +200 °C	48 h
B	Aluminum alloy	Olive-drab cadmium	2.5 mΩ	45 dB at 1 GHz	−65 to +175 °C	500 h
E	Stainless steel	Passivated	50 mΩ	—	−65 to +200 °C	500 h
TA	Titanium alloy	None (bare titanium)	10 mΩ	65 dB at 10 GHz	−65 to +200 °C	500 h (marine version)

Contact sizes and current ratings

Contact size	Engaging diameter	Contact resistance	Contact resistance (hermetic)	Current rating	Wire size
22D	0.76 mm	≤ 14.6 mΩ	≤ 28 mΩ	5 A	AWG 22–26 (0.13–0.33 mm²)
22	0.76 mm	Tested to your requirements	—	5 A	AWG 22–26
20	1.02 mm	≤ 7.3 mΩ	≤ 12.0 mΩ	7.5 A	AWG 20–24 (0.20–0.52 mm²)
16	1.58 mm	≤ 3.7 mΩ	≤ 8.5 mΩ	13 A	AWG 16–20 (0.52–1.31 mm²)
12	2.41 mm	≤ 1.83 mΩ	≤ 5 mΩ	23 A	AWG 12–14 (2.08–3.31 mm²)

How to order

JY [type] [class] [shell] [finish] [arrangement] [contact] [key] [suffix]

Example: JY27508E14F35SN — Box-mount rear-mounting receptacle, no backshell thread, shell 14, aluminum with nickel, arrangement 14-35, crimp socket contacts, key N

Code segment	Options
Type	`27473 / 27484` Plug / shielded plug `27472 / 27497` Wall-mount square-flange receptacle, front / rear `27513 / 27508` Box-mount square-flange receptacle, front / rear `27474` Jam-nut receptacle `27902` Round-flange adapter receptacle `27476 / 27477 / 27478` Hermetic: wall mount / jam nut / solder mount
Class	`T` Rear thread for backshells `E` No rear thread `Y` Hermetic
Shell	`08 – 24` 8, 10, 12, 14, 16, 18, 20, 22, 24
Finish	`F / B` Aluminum — electroless nickel / olive-drab cadmium `E, K1 / W1` Stainless steel — passivated / cadmium
Arrangement	`e.g. 35` See the insert arrangement table below
Contact	`P / S` Pin / socket (crimp or solder) `PC, PL / SC, SL` PCB pin / socket, short or long tail `C` Feed-through pin (JY27472Y)
Key	`N` Normal `A B C D` Alternate (shell 8: N, A, D only)
Suffix	`H` Solder-cup contacts `V` Fluorosilicone seals `-U` Reverse-side plug `Rn` n pairs of thermocouple contacts

Protective caps JY27510 (plug) and JY27511 (receptacle) are ordered separately.

Insert arrangements

96 standard layouts, viewed from the mating face of the pin insert. The arrangement number is written as shell size – layout (for example 25-35). The service rating sets the withstanding voltage (see specifications).

Shell sizeMinimum contactsContact size

96 layouts

Arrangement	Contacts	Contact sizes	Service rating
8-03	3	3 × size 20	I
8-35	6	6 × size 22D	M
8-44	4	4 × size 22	M
8-98	3	3 × size 20	I
10-02	2	2 × size 16	I
10-04	4	4 × size 20	I
10-05	5	5 × size 20	I
10-08a	8	4 × size 20, 4 × size 22D	M
10-35	13	13 × size 22D	M
10-98	6	6 × size 20	I
10-99	7	7 × size 20	I
12-03	3	3 × size 16	II
12-04	4	4 × size 16	I
12-06	6	2 × size 12, 4 × size 20	M
12-06A	6	2 × size 16, 4 × size 20	M
12-08	8	8 × size 20	I
12-08A	8	4 × size 16, 4 × size 20	M
12-12A	12	12 × size 20	N
12-16	16	3 × size 16, 13 × size 22D	N
12-35	22	22 × size 22D	M
12-98	10	10 × size 20	I
14-04A	4	4 × size 12	M
14-05	5	5 × size 16	II
14-06A	6	6 × size 16	M
14-13	13	4 × size 16, 2 × size 20, 7 × size 22D	M
14-14	14	6 × size 16, 8 × size 22D	N
14-15	15	1 × size 16, 14 × size 20	I
14-18	18	18 × size 20	I
14-19	19	19 × size 20	I
14-23	23	3 × size 16, 2 × size 20, 18 × size 22D	M
14-32	32	9 × size 20, 23 × size 22D	M
14-35	37	37 × size 22D	M
14-97	12	4 × size 16, 8 × size 20	I
16-06	6	6 × size 12	I
16-06C	6	4 × size 12, 2 × size 22	I
16-08	8	8 × size 16	II
16-14	14	6 × size 12, 8 × size 22D	N
16-19	19	4 × size 16, 11 × size 20, 4 × size 22D	M
16-26	26	26 × size 20	I
16-28A	28	3 × size 12, 25 × size 22D	M
16-35	55	55 × size 22D	M
16-42	42	42 × size 22	M
16-99	23	2 × size 16, 21 × size 20	I
16-20	20	4 × size 12, 16 × size 22D	M
18-11	11	11 × size 16	II
18-13	13	8 × size 12, 5 × size 20	I
18-17	17	2 × size 12, 15 × size 20	M
18-20	20	8 × size 16, 4 × size 20, 8 × size 22D	M
18-22	22	7 × size 12, 15 × size 22D	M
18-28	28	2 × size 16, 26 × size 20	I
18-30	30	1 × size 16, 29 × size 20	I
18-32	32	32 × size 20	I
18-35	66	66 × size 22D	M
18-45	67	67 × size 22D	M
18-53	53	53 × size 22	M
18-96	9	9 × size 12	I
20-11	11	11 × size 12	I
20-16	16	16 × size 16	II
20-24	24	24 × size 20	I
20-25	25	25 × size 20	I
20-27	27	27 × size 20	I
20-35	79	79 × size 22D	M
20-39	39	2 × size 16, 37 × size 20	I
20-41	41	41 × size 20	I
20-61	61	6 × size 16, 55 × size 22D	M
20-75A	4	4 × size 12	I
22-02	85	85 × size 22	M
22-14	14	14 × size 12	I
22-21	21	21 × size 16	II
22-26	26	8 × size 12, 18 × size 20	M
22-32	32	32 × size 20	I
22-34	34	34 × size 20	I
22-34A	34	4 × size 12, 16 × size 16, 14 × size 22D	M
22-35	100	100 × size 22D	M
22-36	36	36 × size 20	I
22-53	53	53 × size 20	I
22-55	55	55 × size 20	I
22-70	70	10 × size 20, 60 × size 22D	M
22-86	86	16 × size 20, 70 × size 22D	M
22-97	16	16 × size 16	I
22-99	11	11 × size 16	II
24-02	100	100 × size 22	M
24-04	56	8 × size 16, 48 × size 20	I
24-19	19	19 × size 12	I
24-24	24	12 × size 12, 12 × size 16	I
24-29	29	29 × size 16	I
24-35	128	128 × size 22D	M
24-39	39	2 × size 12, 17 × size 16, 20 × size 20	M
24-43	43	20 × size 16, 23 × size 20	I
24-45	45	8 × size 12, 37 × size 20	M
24-61	61	61 × size 20	I
24-64a	64	8 × size 16, 40 × size 20, 16 × size 22D	M
24-69	69	10 × size 16, 15 × size 20, 44 × size 22D	M
24-92	92	4 × size 20, 88 × size 22D	M
24-93	118	8 × size 16, 110 × size 22D	M
24-118G	118	8 × size 16, 110 × size 22D	N

Typical applications

Test and measurement instruments
Ground electronics and control cabinets
Rail and transit interiors
Industrial controls
Laboratory and medical equipment

Frequently asked questions

When should I choose Series II instead of Series I or III?

Series II has the shortest, lightest shells. It suits equipment that is not exposed to high-level vibration or heavy sand and dust. For severe vibration choose the threaded Series III; for fast bayonet mating with a full-length shell choose Series I.

Why are Series II shell sizes even numbers?

Series II shells are numbered 8 to 24, one step below the Series I and III sizes 9 to 25. The insert arrangements follow the same layouts, for example 24-35 with 128 size 22D contacts.

Can you match my MS27473 part numbers with GJB599 Series II?

GJB599 Series II is built to GJB 599A Series II, the counterpart of MIL-DTL-38999 Series II. Send us your D38999 part number and we will propose the matching configuration and samples for your mating test.

Selection guides

38999 Series I, II, III and IV: What Is the Difference?

From sample to production

Send your requirements
Part number, drawing, pin-out or a short description of your application.
Configuration and quote
Our engineers match the configuration and reply with a drawing and quotation.
Samples
Samples are built to order. The minimum order quantity is 10 pieces, and samples and production orders each take 4–8 weeks. Third-party testing to your specification is available on request.
Your approval
You test the samples in your own equipment and approve them.
Series production
Production follows the approved sample configuration, with machining, molding, plating and assembly in our own Shenyang factory.

Need a quote or a drawing?

Send your part number, pin-out or drawing. Every inquiry is acknowledged by email within 1 business day, and an engineer follows up with a matched configuration, drawing or quotation.

Request a quote

GJB599 Series II Low-Profile Bayonet Connectors (38999 Series II Type)

Key features

Specifications

Versions

Shell materials and finishes

Contact sizes and current ratings

How to order

Insert arrangements

Typical applications

Frequently asked questions

Selection guides

Related series

J1784 Backshells for 38999-Type Connectors

J599 Series III Circular Connectors (38999 Series III Type)

Protective Caps for 38999-Type Plugs and Receptacles

GJB599 Series I Bayonet Circular Connectors (38999 Series I Type)

From sample to production

Send your requirements

Configuration and quote

Samples

Your approval

Series production

Need a quote or a drawing?