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Keys for some 1200s in some markets are matched: One key opens all doors as well as operates the ignition. In other markets there is a different key for the ignition. Also there are left-hand and right-hand keys that otherwise look identical.

Also see: 
* Locks
* Instruments and Controls#Ignition Switch

[edit]

Usage

1972 USA Owners manual
03 04
Your Datsun is equipped with an ignition key warning buzzer. A buzzer will sound when the key is left in the ignition switch and the driver's door is opened.

Main: Key Warning Buzzer

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Key Types

Early 1200s used two keys: a reversible key for the doors, and a single-sided key for the ignition switch. Starting from 1972, Datsun 1200 in the USA was fitted with a revised ignition switch which used the same key as the doors.

VOSS double-sided (reversible) Nissan Motor key. KEY00-00035
Album 14874

Early models with optional steering lock used a VOSS single-sided oval-headed key for the ignition. So these 1200s used two keys:
Album 21977

The use of one-key-fits-all or two keys depended on the model, year and country:
Album 22000

* USA 1971 sedan: 2 different keys
* USA 1971 coupe: single key
* USA 1972-1973: single key

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OVAL KEYS

Early 1200 models with optional steering lock used an oval-headed key for the steering column. In the USA market, this was 1971 only.

VOSS KEY00-00034/VH1000 single-sided
Album 21987
VOSS-type keys (KEY00-00034) were made by Kanto Seiki under license of VOSS of Germany. These were used starting around 1969. The former WASO type (KEY00-00028) were made by Kanto Seiki under license of WASO of Sweden. The only real difference is the length. The VOSS keys are shorter, which means WASO key won't fit in the VOSS cylinder. The longer VOSS keys should never be used in a WASO cylinder, as it may lock the steering incorrectly.

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Nissan Motor Keys

1972-1973 Datsun 1200 used VOSS double-sided keys with the "Nissan Motor" text and "N" symbol. These fit the dash ignition switch, doors, boot and fuel filler lid locks. Also, later 1200s with steering lock used this key instead of the oval key.

VOSS KEY00-00035 double-sided
Album 14874

VOSS double-sided newer shape used in JDM (Sunny Truck) and SADM (Bakkie)
Album 21980 Album 14875
KEY00-00055 Left-hand $8.27 USD (not KEY00-00056 Right-hand)

Album 24396

B110 key is shorter than 510 key:
Album 24395

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Ignition Switch

Main: Ignition Switch

Album 21998

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Part Numbers

Also see: Key Part Numbers
Also see: Locks

KEY00-00055 Key Blank-Master
* supersedes 80610-H1001 KEY ASS'Y-with holder Coupe

Replacement style, genuine Nissan part:
Album 21977

KEY00-00035 KEY-BLANK 8110-

KEY00-00055 KEY-BLANK
Album 21997

KEY00-00035 KEY-BLANK FOR VOSS TYPE [reversible]
Album 14874

KEY00-00034 KEY-BLANK FOR VOSS TYPE STEERING LOCK [single-sided]
Album 21981 Album 21978

B110 USA
80610-H1900 KEY (WITHOUT HOLDER)
80610-H1001 ASSY-KEY [with leather holder]

Japan
80690-E6000 CASE ASSY-KEY [leather case for key]

B210 USA
KEY00-00039 KEY-BLANK ST'G LOCK & DOOR

B310
K9810-H9101 KEY SET -0880
99810-H9101 KEY SET 0179-
99810-H9100 KEY SET -1278
KEY00-00039 KEY-BLANK,TYPE L

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Dimensions

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Length

Nissan keys come in various lengths. The original Datsun 1200 keys were the short length.
Album 21983

Short: ~31 mm groove length
- 2.0 inch overall
- Original 1200 reversible key length
Medium: ~38 mm groove length
- 2.4 inch overall
- Used by Datsuns & Nissans 1974-1981, Subaru, and Mazda Cosmo
Long: ~46 mm groove length
- 2.7 inch overall

NISSAN KEY LENGTHS
11mm KEY00-00035
21mm KEY00-00036
21mm KEY00-00037

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Width

Width is 8.9 mm at the point where the grooves start.
Album 21984
Width of the teeth area is 7.1 mm

Center groove width: 2.3 mm
Outside groove width: about 1.0 mm minimum (some keys have it machined all the way out, that is to say a wider groove)

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Right-Handed vs Left-Handed

The reversible key came in left-hand and right-hand versions. Make sure you buy the type that fits your Datsun.
Album 24394

KEY00-00035 left groove (Datsun 1200)
2nd groove is left of center groove
Album 14874
KEY00-00035

2nd groove is right of center groove
Album 21982
KEY00-00034 R (Datsun 510)

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Aftermarket Keys

Two styles were used (center, right). The newer, longer one (left) will work, but is not the original style.
Album 10322
The little groove diagrams below the photos are for the keylock, so they are the reverse of the actual key.

WARNING: The first key is right-handed, while the second is left-handed. Each key comes either way. Be sure to purchase the correct one for your 1200 locks.

Interesting that some 1200s came with two different keys originally. The 1971-1973 North American models came with single key for ignition, doors and trunk.

[edit]

Oval Single-Sided Nissan Ignition Key

This is the earlier style for 1968-1971 Datsun, Mazda before the double-sided keys were used. This was used by 1971 USA 1200.
Album 21981

* Nissan: KEY00-00034 (Key-Blank for Voss Type Steering Lock)
* Ilco/Ilco-Kaba: DA20

NOT THIS Waso:
* Waso Type FH
* Taylor: D80K

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Short Double-Sided Nissan Key

A double-sided (reversible) key was used by 1972-up 1200s for the ignition switch.
Album 14874

* Nissan: KEY00-00035 (Key-Blank for Voss Type)
* Ilco: 62DV
* Dominion/DL/Hook: DT17
* Taylor: X10
* JMA DAT-8
** Silca : DAT 7 
** HD Hook : C050 
** HD Hook : C50 
** Orion : DA12 
** Errebi : NS3R 
** CEA : NS7 
** RST : D131 
** CB Hook : 212 
** Standard : 212 
** Curtis : DA-21

Taylor X10
Album 21989

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Long Nissan/Subaru Key

Used by Datsuns, Nissans 1974-1981, Subaru, and Mazda Cosmo. This "long" key is not original to the 1200, but works perfectly fine.

Reversible (left) 2.4 inches long
* Taylor 62DU
* Ilco X7
* Nissan M5001
* Taylor X7
* JMA DAT-1D
** Silca : DAT 6R 
** HD : DT19 
** HD Hook : C052 
** HD Hook : C52 
** Orion : DA11L 
** Errebi : NS2R 
** CEA : NS6S 
** RST : D151 
** RST : D151R 
** CB Hook : 214 
** DL : DT19 
** Curtis : DA-21

NOT this! Reversible (Right, mirror image)
* Nissan M4001
* Taylor X6
* Ilco X6
* JMA DAT-1I
** Silca : DAT 6 
** HD : DT18 
** HD Hook : C051 
** HD Hook : C51 
** Orion : DA11 
** Errebi : NS2 
** CEA : NS6 
** RST : C151R 
** RST : D151R 
** CB Hook : 213 
** CB Hook : 215 
** DL : DT18 
** Curtis : DA-22

Single-sided
* Taylor D80D/D80E/D80F/D80G

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Option

80610-H1001 Key Ass'y (with holder)
Album 1555

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Key Code

When your key gets worn down too far, making a copy results in a poorly-working new key. Instead, have a new key cut from the original key code.

In Australia, the key cut number was stamped directly into the original keys
Additionally, the code may be stamped on the right-side door lock cylinder. Remove the door panel to get at the clip which holds the lock in.
- Not necessarily stamped on left-side door lock, nor trunk/boot lock, nor ignition lock

Album 21992

In USA, the key cut number was penciled onto the inside of the glove box door:
Album 13443

VF: for VOSS single-side KEY00-00034
- mine is marked "1", possibly to indicate my locks are a single-key system
VH: for older (pre-Datsun 1200) WASO KEY00-0028
Eng*/DOOR: 4-digit key code

Codes

In the range of (M)5001-(M)6000 (or N) for reversible KEY00-00035/KEY00-00055
range 4001-5000 is for mirror image keys (non-Datsun 1200)

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Non-1200 Keys

Older keys
Album 14873

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WASO Oval Keys

Use only VOSS type for Datsun 1200
Album 21985

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Single-Cut Keys

Do not confuse Datsun 1200 keys with these single-sided VOSS keys. They also had "Nissan Motor" text and "N" symbol, but were used by earlier models e.g. Datsun Roadster.
Album 21986

Album 21988

From http://www5.plala.or.jp/power_planning/key.html: 
* KEY00-00201 non-centered grooves
  Mirror of 00202
* KEY00-00202 non-centered grooves
   
* KEY00-00203 centered groove
  
* KEY00-00204 centered groove
  Mirror of 00204