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Nissan Engineering Section (N.E.S.) specified six- to nine-digit Part Number formats for bolts and screws and other small hardware. During the 1970s these numbers were replaced by regular 10 digit Nissan Part Numbers.

Early Format

[from 520 parts catalog C-037 1965.8]

Nissan Standard Parts (N.E.S.) N.E.S. (Nissan Engineering Standard) parts consist of 6 digits, arrangement of which is, as a rule, in the following order:

Kind(1-~9-59) + Shape & Material(◯) + Nominal Dimensions(Ⓞ) + Length(Δ)

For N.E.S. Parts that have been processed surface finishing or cotter pin hole symbols showing these processings are added to the rear end.

Part Name                   Arrangement of Digits
------------              ------------------------
Hexagon bolt              1 —   ◯   Ⓞ   Ⓞ   Δ   Δ 
Carriage bolt             1 —   ◯   Ⓞ   Δ   Δ   Δ
Stud                      2 —   ◯   Ⓞ   Ⓞ   Δ   Δ
Machine screw             3 —   ◯   Ⓞ   Ⓞ   Δ   Δ
Tapping screw/Wood screw  5 —   ◯   Ⓞ   Ⓞ   Δ   Δ
Rivet                     6 —   ◯   Ⓞ   Ⓞ   Δ   Δ
Hexagon nut               9 —   1    1   ◯   Ⓞ  Ⓞ
Self-lock hexagon nut     9 —   1    2   ◯   Ⓞ  Ⓞ
Miscellaneous nut         9 —   1    3   ◯   Ⓞ  Ⓞ
Washer                    9 —   1    5   ◯   Ⓞ  Ⓞ
Tooth lock washer         9 —   1    6   ◯   Ⓞ  Ⓞ
Nut retainer              9 —   1    7   ◯   Ⓞ  Ⓞ
Pin & Key                 9 —   2    0   Ⓞ   Δ   Δ
Plug                      9 —   3    1   ◯   Ⓞ  Ⓞ
Grease Nipple             9 —   3    2   ◯   Ⓞ  Ⓞ
Electric parts            9 —   4    ☆   ◯   Ⓞ  Ⓞ
Rubber parts              9 —   5    ☆   ◯   Ⓞ  Ⓞ

NOTE: ☆ Kind, ◯ Shape & Material, Ⓞ Nominal dimension, Δ Length

2. Distinction by Alias Dimension (Mark Ⓞ)
Distinction by alias dimensions of diameter and width, and apply 2 digits next to the rear of the digit showing Shape & Material.
[Table shows each code could mean #, inch, or mm value.
Later catalogs add these notes:
1. A. B. C. D. の 4　系列の適用については別に定める。
2. スタッのドの呼び寸法の大きさに対する？？のつけ方は別に定める。
3. ？ビンにおいては？　1　杤の？？を？？する]

3. Distinction by Length Mark (Δ)
Apply 2 digits next to the rear of those standing for Alias Dimensions. However this is not applied when the length is not necessary. [The digits are in mm, conversion is to inches]

4. Symbols of Surface Finishing, Cotter Pin Hole
For the parts that have surface finishing or cotter pin hole, apply the following digits adding —mark to the rear of the above mentioned parts number.

                  Surface   Cotter pin hole
Not processed               10
Zinc-Cadmium        1       11
Chrome coated       2       21
Copper coated       3       31
Phosphoric Acid     4       41
Brass               5       51
Copper              6       61

Overview

Also See:
* Nissan Part Numbers
* NES Legend

NES hardware parts originally used a six-digit format:

Type + Kind + dimensions (d) + length (L)

  t-kddLL or t-kkdLL or t-kkkLL
  e.g: 1-10612

  Surface-processed parts had suffix added
  e.g: 1-10612-51 or 83-30414-1

Around 1968, the digit '8' was added to the beginning:

 81-10612

Finally in the early 1970s they transformed into Nissan standard 10 digit numbers, by adding a 0 to the beginning requiring two finish processing digits at the end:

 08110-612pp

Example:

81-10612 BOLT, fixing timing chain tensioner support [B10 model]
- Part: 81: Hexagon bolt
- Kind: 11= Low carbon steel
- Dimension: 06=6mm diameter thread (M6)
- Length: 12=12mm

Example:

9-16114 WASHER-lock to fix timing chain tensioner [410 model]
- New number would be 89-16114
- Part-Kind: 9-16: Washer, Tooth-lock
- Shape & material: 1=Spring-lock medium thickness
- Dimension: 14=14mm

Example: B10 steering column cover screw

83-30414-1
33= Machine screw, Oval head
04= 4mm diameter
14= 14mm length
1= Zinc cadmium coated

Example: B110 steering column cover machine screw

08330-41410
- 08=standardize hardware prefix
- 33=Machine screw, Oval head
- 04=4mm diameter (M4)
- 14=14mm length
- 1= Zinc cadmium coated
- 0= filler to complete ten digits

Metric

ISO metric screw threadᵂ

Nissan models use mostly British threads until January 1967, when in the middle of the month they adopted JISᵂ metric standards across the board, starting with the R16, H20 and H30 engines. Thereafter the metric system was "adopted for all the screw threads of engine, chassis and body of Nissan's vehicle when:"

1. Model is change.
2. New unit is adopted.
3. New model is produced.

Although some parts still remained Standard threads (e.g. R16 cylinder head bolts).

For example, 1200 wheels are still 12" by 4" with a 4.5" PCD, as befitting their English ties building Austin vehicles.

Strength

Note: Japanese Industrial Standardsᵂ (JIS) metric standards were used by Nissan starting in the 1960s.

CLASS	NES Terminology	MPa	Notes
JIS 4T	"low carbon steel"	392	no mark means 4T
JIS 7T	"high carbon steel"	686	exceeds Class 9.8
JIS 9T	"alloy steel"	883	exceeds Class 10.9

Kind

0 1- Bolts

11ddLL: Hexagon bolt, Low carbon steel
12ddLL: Hexagon bolt, Medium carbon steel
13ddLL: Hexagon bolt, Alloy steel
14ddLL:
15ddLL:
16ddLL:
17dLLL: Carriage bolt, Round head
18dLLL: Carriage bolt, Flat head
19dLLL: Carriage bolt, Step

2- Studs

21ddLL: Stud, Low carbon steel (for cast iron)
22ddLL: Stud, Medium carbon steel (for cast iron)
23ddLL: Stud, Low carbon steel (for light alloy)
24ddLL: Stud, Medium carbon steel (for light alloy)
25ddLL:
26ddLL:

3- Machine Screws

Example: 08310-41620 SCREW, Pan head M4x16 chrome coated

31dd LL: Machine screw, Pan head
32ddLL: Machine screw, Flat head
33ddLL: Machine screw, Oval head
34ddLL: Machine screw, Truss head
35ddLL: Machine screw, Blind head
36ddLL: Machine screw, Hexagon head

4- Pointed Machine Screw

41ddLL: Pan head
42ddLL: Flat head
43ddLL: Oval head
44ddLL: Truss head
45ddLL: Blind head
46ddLL: Hex head

5- Other Screws

51ddLL: Tapping screw, Pan head
52ddLL: Tapping screw, Flat head
53ddLL: Tapping screw, Oval head
54ddLL: Tapping screw, Truss head
57dLL: Wood screw, Round head
58dLL: Wood screw, Flat countersunk head
59dLL: Wood screw, Oval head
a) pan, b) button, c) round, d) truss, e) countersunk, f) oval

6- Rivets

61ddLL: Rivet, Round head
62ddLL: Rivet, Flat countersunk head
63ddLL: Rivet, Flat head
66ddLL: Rivet, Tubular flat head
67ddLL: Rivet, Tubular flat countersunk head
68ddLL: Rivet, Split oval head

711 Flared Nuts

7111dd Flared nut, inpe-ted
7112dd Flared nut, standard

712 Connectors

7121dd Connector, straight
7122dd Connector, elbow
7123dd Connector, elbow

72 Hose Clamps

7211dd: Hose clamp, A
7211dd: Hose clamp, B
7231dd: Hose clamp, radiator hose

731 Clevis

7311dd: Clevis, A?
7312dd: Clevis, B?
7313dd: Clevis, ???

840 Clevis Pins

<08840> ?
<00840>-dll (?)

9-11 Hex Nuts

Note: dd=#Dimension Digits e.g. 04 = M4 thread. JIS B.1181ᴳ?

9111dd: Hexagon nut, low carbon steel #4T
9112dd: Hexagon nut, medium carbon steel
9113dd: Hexagon nut, Low, low carbon steel
9115dd: Hexagon nut, High, low carbon steel
9116dd: Hexagon nut, High, medium carbon steel
9117dd: Hexagon nut, Recess, high, low carbon steel
9118dd: Hexagon nut, Recess, high, medium carbon steel
9119dd: Hexagon nut, Recess, low, low carbon steel
9110dd: Hexagon nut, Recess, low, high carbon steel

9-12 Lock Nuts

Self-locking nut (stopper nut)

9121dd: ???
9122dd: ???
9123dd: Self-locking hexagon nut, N, low carbon steel
9124dd: Self-locking hexagon nut, N, medium carbon steel
9125dd: Self-locking hexagon nut, low, low carbon steel
9126dd: Self-locking hexagon nut, low, medium carbon steel
9127dd: ???
9128dd: ???

9-13 Square & Wing Nuts

9131dd: Nut, Square
9134dd: Nut, Wing (forged)
9135dd: Nut, Wing (sheet)

9-14 Hex Weld Nuts, Tapping Discs, Plate Nuts

9141dd: ?
9142dd: ?
9143dd: Tapping Disc, A?
9144dd: Tapping Disc, B?
9145dd: Nut, Plate

9-15 Washers

9151dd: Washer, Spring lock medium
9152dd: Washer, Spring lock thick
9154dd: Washer, Plain standard
9155dd: Washer, Plain large
9158dd: Washer, Finish

example: 08915-53810 WASHER-plain large
0 standardization digit (starting ~1968) 
8 Nissan Engineering Section prefix
91 Washer
5 washer type: plain large
38 #Dimension Digits: =8mm (M8)
10 #Suffix digits: no special finishing

9-16 Tooth-lock Washers

Tooth Lock washer (shakeproof)

9161dd: Washer, toothed inside ratchet (outside dia. small)
9162dd: Washer, toothed inside ratchet (outside dia. large)
9163dd: Washer, toothed outside ratchet
9164dd: Washer, toothed 80° countersunk
9165dd: Washer, toothed 90° countersunk
89-166dd: Washer, ???
89-167dd: Washer, ???
9168dd: Washer, toothed both side ratchet

9-17, 9-19 Nut Retainers

9171dd/89-191dd: Nut retainer, Both shanks round hole
9172dd/89-192dd: Nut retainer, One shank round hole
9173dd/89-193dd: Nut retainer, Both shanks long hole
9174dd/89-194dd: Nut retainer, One shank long hole
9195dd: ????

9-2 Pin & Key

921dLL: Cotter pin
- 6 Semicircular key
- 8 Parallel key

(00)921dLL: Cotter pin (example: <00921>-21810)

9-31 Thread Plugs

9311dd: Plug, threaded, square head taper thread
9312dd: Plug, threaded, square hole taper thread
9312dd: Plug, threaded, recessed taper thread
9313dd: Plug, threaded, hex head taper thread
9314dd: Plug, threaded, hex head parallel thread

9-32 Grease Nipples

9321dd: Grease nipple, Straight
9322dd: Grease nipple, 67.5°
9323dd: Grease nipple, 90°

9-4 Electric Parts

94*1dd: Electric parts

9-5 Rubber Parts

95*1dd: Rubber Grommet

9-6 Spring Nuts

9631dd: Spring nut, A1 type
9632dd: Spring nut, A2 type
9641dd: Spring nut, B type
9651dd: Spring nut, C type
9661dd: Spring nut, D1 type
9662dd: Spring nut, D2 type
9663dd: Spring nut, D3 type
9664dd: Spring nut, D1 type

9-61 Push-on Spring Nuts

9611dd: Spring nut, push-on, A1 type
9612dd: Spring nut, push-on, A1 type
9613dd: Spring nut, push-on, B type
9614dd: Spring nut, push-on, C type

Dimension Digits

Distinction by alias dimension of diameter or width. Each number may be either a size, inch dimension or metric dimension.

DD = width or diameter

Dimension Digits	Size	Imperial	Metric
01 (or 31, 51, 61)	#1	1/16"	1mm
02 (or 32, 52, 62)	#2		2mm
03 (or 33, 53, 63)	#3	3/32"	3mm
04 (or 34, 54, 64)	#4	7/64"	4mm
05 (or 35, 55, 65)	#5	1/8"	5mm
06 (or 35, 55, 65)	#6	n/64"	6mm
07 (or 36, 56, 66)			3.5mm
08 (or 38, 58, 68)	#8	5/32"	8mm
09 (or 39, 59, 69)	#9		9mm
10 (or 40, 60, 70)	#10	3/16"	10mm
12 (or 42, 62, 72)	#12	7/32"	12mm
13 (or 43, 63, 73)	#13		13mm
14 (or 44, 64, 74)	#14	1/4"	14mm
15 (or 45, 65, 75)	#15	5/16"	15mm
16 (or 46, 66, 76)	#16	3/8"	16mm
17 (or 47, 67, 77)	#17	7/16"
18 (or 48, 68, 78)	#18	1/2"	18mm
19 (or 49, 69, 79)	#19	9/16"
20 (or 50, 70, 80)	#20	5/8"	20mm
22 (or 52, 72)	#22	3/4"	22mm
24 (or 54, 74)	#24	7/8"	24mm
26 (or 56, 76)	#26	1"
28 (or 58, 78)	#28	1-5/8"

Length Digits

長さによる区分

LL digits = Length
Early form: n-nnnLL (likely to be imperial)
Transition form: nn-nnnLL
1970s form: nnnnn-nLLnn (likely to be metric)

Datsun fasteners started out using imperial dimensions (British thread standard). But more and more during the 1960s Datsun used some Metric fasteners, until starting in 1967 nearly all parts were changed to metric. Lastly, the flywheel bolts changed to metric in 1973. Only the oil sender threads continued to use BPT.

Metric LL digits
04 4mm
...
95 95mm

Imperial LL digits
07 1/4 inch
10 3/8
13 1/2
16 5/8
19 3/4
22 7/8
26 1 inch
28 1-1/8
32 1-1/4
35 1-3/8
38 1-1/2
41 1-5/8
44 1-3/4
48 1-7/8
51 2 inch
54 2-1/8
57 2-1/4
64 2-1/2
70 2-3/4
76 3 inch

Suffix

For parts that have surface finishing or cotter pin hole, symbols showing these proceedings are added at the end of the part number.

Two digits mean it has a cotter pin hole. Single digit: No cotter pin hole.

1: Zinc cadmium coated
2: Chrome coated
3: Copper coated
4: Phosphoric acid coated
5: Brass
6: Copper

With Cotter Pin Hole

10: surface not processed
11: Zinc cadmium coated
21: Chrome coated
31: Copper coated
41: Phosphoric acid coated
51: Brass
61: Copper

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NES Part Numbers

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