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21480 Pacific BoulevardSterling, VA 201 6-890366-8903 l4lK
Illustration #
1 HK21 E, Complete2 Assembly Groups3 Receiver Group4 Bolt Group5 Recoil spring guide rod assembly6 Trigger Group7 Buttstock8 Barrel9 Belt feed unit10 Bipod11 Accessories12 Special tools, gauges and fixtures
HECKLER & KOCH, INC.Federal Operations Department
1998 Parts ListHK21 E
Description
Tel. (703) 450-1900FAX (703) 450-8160
Please refer to the current HK US Government & Law Enforcement Dealer Price List for a complete
listing of accessories, cleaning and instructional materials, and miscellaneous items for HK products.
February 1998
Illustration 1
HK21 E, Complete,
5 6-
?Icl0
09
8
HK2lE
Machine Gun HK21 E, CompleteIllustration 1
Item # Parts Description Part #
I 094000HK2lE, belt-fed machine gun, 7.62 X 51 mmNATO, shipped with sling, bipod, assault grip,muzzle cap, pistol grip cleaning kit, andoperators manual (1 barrel)
Carrying handle
5
Elbow spring, carrying handle
Axle, carrying handle
Assault grip, compl. (items 5,6,8,9,10).Old style, requires hex key (limited availability)Out of Production; see item## 228374 below.
Assault grip, compl., new style, requires no hexkey
222555
222553
222554
202513
228374
6 Locking plate, assault grip 202514
7 Safety washer, carrying handle 926005
8 Cylinder head screw, assault grip 928084
9 Spring washer, assault grip 928086
10 Spring ring, assault grip 929191
11 Bipod, compl., new style, adjustable legs 222755
+ Bipod, old style, non-adjustable legs 200150
+ Carrying sling, compl. 222515
+ Denotes item(s) not pictured in illustrationw Please call for price and availability 2
Revised 2/98
HK2lE
Machine Gun Assembly GroupsIllustration 2
HK2lE
Machine Gun Assembly GroupsIllustration 2
Item # Parts Description Part #
8 Locking pin, large for butt stock 200520
Receiver, compl. 222561
Bolt Group, compl. (w/o recoil spring guiderod), old style
Recoil spring guide rod assembly, compl.
Trigger group, compl.
Butt stock, compl.
Barrel, compl., 560 mm (22”)
Barrel, compl., 45Omm (17.72”) forHK 1 E/21 E
Belt feed unit, compl., old style 222788Belt feed unit, compl., new style 215089
+ Denotes item(s) not pictured in illustration* Please call for price and availability 4
222527
228149
222508
222600
22244 1
222511
Revised 2/98
HK2lE
Machine Gun Receiver GroupIllustration 3
Item # Parts Description Part #
1
+
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Receiver, incompl., w/o parts
Rear sight, compl.,consisting of items 2 - 13
Rear sight aperature
Elevation adjustment screw
Windage drum
Rear sight support
Elevation drum, compl.
Adjusting ring
Plunger, detent
Compression spring, catch pin
Compression spring
Riveting pin, 3h9 X 26
Lock nut, M5 X 6mm
Slotted pin, 2.5 X 8mm
Washer for rear sight support
Toothed lock washer, A5.3mm
Clamping screw, rear sight mounting
Windage adjustment screw
Barrel safety catch, compl.
Elbow spring, barrel safety catch
+ Denotes item(s) not pictured in illustration%F Please call for price and availability 6
222562
222438
222405
221181
222409
222399
222435
222402
222403
222404
221175
929752
928688
928689
200371
922617
222236
200384
222343
222331
Revised 2/98
HK2lE
Machine Gun Receiver Group [cont.)Illustration 3
Item # Parts Description Part #
20
+
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Washer, barrel safety
Forward assist, compl.,consisting of items 21 - 27
Closing plug
Knob, forward assist
Spring, forward assist
Forward assist pawl
Clamping sleeve, 2 X 12mm
Cylindrical pin, 2m 6x6
Cylindrical pin, 2.5 mm 6x6
Compression spring, forward assist
Guide bolt, forward assist
Safety washer, forward assist
Cocking lever support, compl., HK21 E
Cocking lever, compl., HK21 E
Elbow spring, cocking lever
Notched pin, cocking lever
Front sight blade
Clamping sleeve, front sight, 4 X 12mm
Cap, cocking lever tube, compl.
+ Denotes item(s) not pictured in illustratione Please call for price and availability 7
971746
222586
222566
222597
222567
222568
928690
971591
928679
222564
222565
914231
222341
221100
221141
221140
200838
922609
206497
Revised 2/98
Illustration 4
HK2lE Bolt GroupMachine Gun
2
-31
8
HK2lE
Machine Gun Bolt GroupIllustration 4
item # Parts Description Part ##
4
1
2
3
4
5
6
7
8
9
10
10
+
+
11
12
13
14
+T?
Bolt head carrier, compl.consisting of items 1 - 7
Bolt head carrier, incompl.
Bolt head locking lever
Compression spring for locking lever
Cylindrical pin, locking lever
Compression spring for disconnector
Bush
Disconnector, bolt, HK21 E
Firing pin, HK2lE
Firing pin spring, HK2lE
Locking piece, #17, 36’, HK21 E
Locking piece, #9, 40“‘ HK2lE(preferred over ##I 7)
Bolt head, compl., old styleconsisting of items 11 - 17
Bolt head, compl., new styleconsisting of items 11 - 17
Bolt head, incompl., old style
Extractor spring
Extractor, old styleExtractor, new style, polished
Cylindrical pin, extractor
Denotes item(s) not pictured in illustration
Please call for price and availability 9
222522
222521
200452
200453
200454
200383
221191
221192
222551
221188
228142
222102
221186
215087
221196
221198
221197 221197N
221199
Revised 2198
HK21 E
Machine Gun Bolt Group (cont.)Illustration 4
Item # Parts Description Part #
16
17
15 Locking rollers (marking)
l 7.92 mm (-8)
l 7.94 mm (-6)
l 7.96 mm (-4)
l 7.98 mm (-2)
l 8.00 mm (no marking)
l 8.02 mm (1)
l 8.04 mm (11)
Holder for locking rollers, wire
Clamping sleeve, for locking roller holder
+ Denotes item(s) not pictured in illustrationTT Please call for price and availability 10
222487
222486
200007
222232
200446
200447
200448
221125
200450
Revised 2/98
liK2lE
Machine GunRecoil spring guide rod assembly
Illustration 5
11
HK2lE
Machine Gun Recoil spring guide rod assemblyIllustration 5
Item # Parts Description Part #
1 Recoil spring guide rod, incompl. 221237
2 Recoil spring 228148
3 Guide rings 228147
4 Stop pins 221240
5 Riveting pins 221241
+ Denotes item(s) not pictured in illustrationTF Please call for price and availability 12
Revised 2/98
9
HK21 E
Machine Gun Trigger GroupIllustration 6
Item # Parts Descrbtion Part #
4
5
6
7
8
9
10
11
12
+
Pistol grip, plastic shell only
Safety/selector lever, left, w/ axle, compl
Safety/selector lever, right, compl.
Trigger mechanism, compl.consisting of items 4 - 33
Trigger housing, brazed
Holding jack
Elbow spring for holding jack
Axle for holding jack
Distance sleeve for catch
Elbow spring with roller, sear/catch
Catch
Axle for trigger, sear and catch
Disk
13
14
15
16
17
18
Trigger, compl.consisting of items 13 - 16
Trigger, welded, incompl.
Sear release latch, incompl.
El bow spring
Axle
Sear, compl.
Elbow spring, trigger
+ Denotes item(s) not pictured in illustrationf? Please call for price and availability 14
222507
225087
225089
222506
224448
224445
224426
224424
200504
200505
224422
200482
224419
224432
224436
224435
224434
224433
224439
224480
Revised 2/98
HK2lE
Machine Gun Trigger Group (cont.)Illustration 6
Item # Parts Description Part #
19
20
21
22
23
24
25
26
27
28
29
30
31
4
32 Axle for ejector, incompl. (w/o spring ring) 200480
33 Spring ring for ejector axle 20048 1
Catch lever
Axle
Shifter rod, compl.
Counter wheel, compl.
Spring rod
Compression spring for ejector
Eccentric bushing
Hammer, compl.
Compression spring
Axle for hammer
Bush
Compression spring for ejector
Ejector
Axle for ejector, compl.consisting of items 32 + 33
4 Denotes item(s) not pictured in illustrationz? Please call for price and availability
224425
224423
224429
224441
224421
224420
224418
224427
222639
200494
224996
221206
221207
200479
Revised 219815
HK21 E
Machine Gun ButtstockIllustration 7
Item # Parts Description Part #
3
4
5
6
7
8
9
10
11
12
13
14
15
Buttstock, incompl., plastic shell only
Back plate, compl.
Buffer assembly, compl., consisting ofitems 3 - 9, old style - round spring
Buffer assembly, compl., consisting ofitems 3 - 9, new sytle - flat spring
Buffer housing
Buffer bolt
Buffer spring with brake rings
Compression spring, outside
Compression spring, inside
Buffer bushing
Buffer closure screw
Disk
Toothed lock washer
Cylinder head screw
Toothed lock washer
Countersunk screw, self-locking, for buffer
Butt plate, rubber, compl.
+ Denotes item(s) not pictured in illustration%r Please call for price and availability 17
221222
221220
222603
222603N
222601
222602
200892
221229
221230
221345
221231
221224
922614
929877
922615
200543
221223
Revised 2/98
HK21 E
Machine GunBarrel
Illustration 8
18
HK21 E
Machine Gun BarrelIllustration 8
Item # Parts Description Part #
1 Barrel, incompl., 22”, 1 in 12” twist 222432
2 Clamping sleeve, barrel grip 92976 1
3 Grip, barrel, HK2lE 222493
4 Protective lining, barrel grip 221248
5 Cylindrical pin, 11 X 12 mm 928141
6 Locking lever, compl. 221242
7 Elbow spring, barrel locking lever 221247
8 Countersunk screws, M6 X 12 mm 928142
9 Screw sockets 221246
10 Inlay 221245
11 Grip holder 221244
12 Setbolt 222352
Flash hider, compl.,consisting of items 13 + 14
200368
13 Flash hider, incompl. 200369
14 Retaining spring, flash hider 200370
+ Denotes item(s) not pictured in illustration¶F Please call for price and availability 19
Revised 2/98
HK21 E
Machine Gun Belt feed unitIllustration 9
20
HK2lE
Machine Gun Belt feed unitIllustration 9
Item # Parts Description Part #
Belt feed unit housing, compl.,consisting of items 1 - 61
1
4
Belt feed unit housing, incompl. 222458
Cartridge stop, compl.,consisting of items 2 - 5
Cartridge stop
Cartridge stop pin
Compression spring, cartridge stop
Clamping sleeve, cartridge stop pin,lX5mm
6
7
8
9
10
11
12
+
Toothed lock washer, 5.3 mm
Binding screw
Elbow spring, locking lever
Locking lever
Circlip, 3.2 mm
Control bolt
Clamping sleeve, control bolt
Pawl holder, compl.,consisting of items 13 - 17
13
14
15
16
Pawl holder, incompl.
Pawl
Compression spring, paw1
Axle, pawl
4 Denotes item(s) not pictured in illustration* Please call for price and availability 21
222457
222502
222503
222504
221290
928735
922617
200372
221271
222505
926005
221272
929091
222092
221300
222093
221302
221303
Revised 2/98
HK2lE
Machine Gun Belt feed unit (cont.)Illustration 9
Item # Parts Description Part #
17
18
+
19
20
21
22
23
24
25
26
27
28
+
Clamping sleeve, 2 X 8 mm
El bow spring, follower
Follower, compl.,consisting of items 19 - 22
Follower, brazed, incompl.
Roller
Roller axle
Circlip, 3.2 mm
Compression spring, stud
Stud
29
30
31
32
33
34
Cartridge feed lever
Axle, pawl/follower/stud/cartridge feed lever
Circlip, 4.0 mm
Circlip, 5.0 mm
Slide, compl.,consisting of items 29 - 32
Slide
Slide bolt
Compression spring, slide bolt
Circlip, 2.3 mm
Guide pin
Clamping sleeve, 2.5 X 10 mm
+ Denotes item(s) not pictured in illustratione Please call for price and availability 22
925001
221276
221259
221295
221296
221297
926005
221294
221275
221273
221277
971748
97 1749
222365
222366
221293
221294
971746
22A267
922608
Revised 2198
HK21 E
Machine Gun Belt feed unit (cont.1Illustration 9
item # Parts Description Part #
35
36
37
38
39
40
41
42
43
44
45
+
Compression spring, slide
Guide pin
Circlip, 3.2 mm
Control rings
Compression spring, pawl
Pawl
Pressure bolt, control rings
Feed shaft
46
47
48
49
50
Sprocket wheel
Circlip, 8.0 mm
Compression spring, stud
Catch, compl.,consisting of items 46 + 47
Catch, incompl.
Clamping sleeve for catch
Catch lever
Pin for catch & catch lever
221269
221268
926005
222357
221279
222358
222359
222360
222259
971751
221269
221257
Clamping sleeve, pressure bolt retaining,I .5 X 8 mm
221291
925001
222355
221266
971919
51 Pressure bolt, catch 221263
52 Compression spring, pressure bolt 221261
53 Cylindrical pin, 3 mm 929296
+ Denotes item(s) not pictured in illustration
W Please call for price and availability 23Revised 2/98
HK2lE
Machine Gun Belt feed unit (cont.)Illustration 9
item # Parts Description Part #
54
55
56
57
58
59
60
61
+
62
63
64
65
66
67
68
Compression spring
Clamping sleeve, 2.5 X 14 mm
Shift lever
Bearing plug
Circlip, 4.0 mm
Belt inlet
Cylinder head screw, belt inlet
Spring washer for #222276,4 mm
Cartridge guide, compl.,consisting of items 62 - 65
Cartridge guide, welded, incompl.
Catch bolt, cartridge guide
Compression spring, catch bolt #221305
Clamping sleeve, catch bolt, 2 X 8 mm
Socket pin, compl.
Clamping sleeve, socket pin retaining,2 X 1 0 m m
Clamping sleeve, 2 X 5 mm
+ Denotes item(s) not pictured in illustration* Please call for price and availability 24
221262
926015
222361
222362
971748
222593
222726
971977
221252
221304
221305
221306
925001
222500
928406
925000
Revised 2/98
HK21 E
Machine Gun Bipod (Adjustable)Illustration 10
25
HK21 E
Machine Gun BipodIllustration 10
Item #
+
Parts Description
Head bearing, compl.,consisting of items I - 6
Part #
222756
1 Head bearing, incompl. 222757
2 Bearing box 222758
3 Stop pin 222759
4 Compression spring, spring bolt 222760
5 Spring bolt 222761
6 Clamping sleeve, spring bolt 929617
Bipod leg, right, compl., 222762 consisting of items 7, 8, 10 - 12
Bipod leg, left, compl.,consisting of items 7, 9 - 12
222773
7 Bipod leg, incompl. 222763
8 Spur, right, compl. 222764
9 Spur, left, compl. 222774
IO Catch lever, bipod leg 222766
11 Compression spring, catch lever 222765
12 Clamping sleeve, catch lever 928696
13 Elbow spring, bipod legs 222776 tT
14 Axle, bipod leg 222777
15 Circlip, 6 mm 971750
+ Denotes item(s) not pictured in illustration= Please call for price and availability 26
Revised 2198
HK2lE
Machine Gun AccessoriesIllustration 11
G _._---,A -. ,d/-
---.,
. ’
_ ..----.
27
7
HK21 E
Machine Gun AccessoriesIllustration 11
Item # Parts Description Part #
A
B
+
C
D
+
+
+
E
F
G
G
H
+
I
J
+
+=
Bipod (old style, non-adjustable legs)
Bipod (new style, adjustable legs)
Tripod, Ground mount
Mount, Field, Model 1102
Scope mount (w/o rings)
Scope mount (w/ 30 mm rings & mountingscrews)
200150
222755
225187
208720
224592
700400
30 mm Holding rings for mount w/ mountingscrews (set of 2 rings complete)
700571
Beta front sight with tritium dot (includesring)
700126
Carrying sling
Blank firing barrel, 7.62 X 51 mm NATO,with carrier with sling
222515
222725
Spare barrel carrier for HK21 E 22” barrel
Spare barrel carrier for 17.7”HKI 1 E/21 E/23E barrels
222789
222699
Carrying handle
Sight adjustment tool
Assault grip (New style, requires no hexkey)
222555
300009
228374
Back plate assembly, compl. 222648
Ammo belt, 50 round, DMl non-disintegrating belt, 7.62 X 51 mm NATO foruse with old-style belt feed mechanisms
928683
Denotes item(s) not pictured in illustration
Please call for price and availability 28Revised 2/98
HK21 E
Machine Gun Accessories (cont.)Illustration 11
Item # Parts Description Part #
4
4
4
4
K
L
M
50-round drum magazine for HKI 1 E(limited availability)
Cartridge case deflector with detachablecollection bag
Belt starter tab for DMl belt
Belt starter tab for DM6/M 13 belt
Belt box, 7.62 X 51 mm NATO, 100 rounds
Muzzle cap, plastic
Magazine exchange unit, 7.62 X 51 mmNATO (includes magazine adapter, boltgroup, recoil spring assembly)
Butt stock, compl.
Magazine, 20-round, 7.62 X 51 mm NATO
Manual, Operators, HK21 E/23E
Manual, Maintenance & Repair
Manual, Aiming with HK Small Arms
Cleaning kit, 7.62 mm/.30 cal
Pistol grip cleaning kit, compl.
Barrel, compl., 45Omm (17.72”) forHKllE/2lE
4 Denotes item(s) not pictured in illustrationTT Please call for price and availability 29
228584
231872
928188
928144
222448
211013
222794
222600
214874
927815
927870
926153
701960
222510
222511
Revised 2/98
HK2lE Illustration 12a
Machine Gun Special tools, gauges and fixturesfor the HKI 1 E/21 E Machine Gun
30
HK2lE Illustration 12b
Machine Gun Special tools, gauges and fixturesfor the HKI I E/21 E Machine Gun
HK21 E
Machine Gun Special tools, gauges and fixturesfor the HKI 1 E/21 E Machine Gun
Illustration 12c
-- .‘-- ----- .Be.
%
32
HK21 E
Machine Gun Special tools, gauges and fixturesfor the HKI I E/21 E Machine Gun
Illustration 12d
33
HK2lE
Machine Gun Special tools, gauges and fixturesfor the HKI I E/21 E Machine Gun
Illustration 12e
34
Illustration 12HK21 E
Machine Gun Special tools, gauges and fixturesfor the HKI 1 E/21 E Machine Gun
Item # Parts Description Part #
1
2
3
8
9
10
11
12
13
14
15
+=
Straightening mandrel for cocking leverhousing (for straightening cocking leverhousing)
Go and symmetry gauge (to check shapeand symmetry of receiver)
Straightening mandrel for receiver (forstraightening receiver)
Straightening mandrel for front sight holder
Chamber cleaning rod
Chamber cleaning brush
Cleaning kit, 7.62 mm, compl.
Set of calibre plug gauges:7.64, 7.65, 7.67, 7.68 mm (formeasurement of bore diameter)
Rod for item # 7 above
“No go” calibre plug gauge, 7.69 (formeasurement of maximum bore diameter)
Cleaning rod, pull through style
Cleaning wick (chamber/bore cleaning)
Cleaning rod, bore
Wool pull-through (bore cleaning)
Extension rod, bore, for ## 12 above
Feeler gauge (for measurement of bolt gap)
Denotes item(s) not pictured in illustration
Please call for price and availability 35
318603
318939 u
300574
300016
300007
300008
701960
300344
300345
307713
300751
962018
313273
961222
314475
329830
Revised 2/98
HK21 E Illustration 12
Machine Gun Special tools, gauges and fixturesfor the HKI 1 E/21 E Machine Gun (cont.)
Item # Parts Description Part ##
16
17
18
19
20
Limit gauge for firing pin protrusion
Extractor protrusion gauge
Bore scope
Sight adjustment tool
Universal spanner (remove and install flashhider)
21
22
23
24
25
26
27
28
29
30
31
32
+
Assembly plug (assembly of trigger group)
Assembly spanner for buffer closure screw(buffer assembly/disassembly)
Special nut with grease nipple (removebore obstructions)
Grease gun (remove bore obstructions)
Extracting tool for ruptured cartridge cases
Spring fitting tool
Combination pliers
Plastic hammer
Hammer 300 g
Special screwdriver
Fork screwdriver 12 X 200 (barrel)
Set of screwdrivers:
Screwdriver 7 X 140 (Buttstock)
+ Denotes item(s) not pictured in illustration= Please call for price and availability 36
326172
3 18604
954610
300009
312387
330025
321378
955010
964067
955011
330024
957298
957422
957417
318615
324864
952656
Revised 2/98
HK21 E Illustration 12
Machine Gun Special tools, gauges and fixturesfor the HKI 1 E/21 E Machine Gun (cont.)
item # Parts Description Part #
4
4
33
34
35
+
4
+
+
+
36
37
38
39
4
+
Screwdriver 13 X 200 (Buffer, buttstock)
Screwdriver 3.5 X 90 (Carrying handle)
Tap wrench (to hold reamers 35.1 - 35.5)
Lathe dog, 15 mm (assembly/disassemblyof recoil spring guide rod assembly)
Set of hand reamers:
Hand reamer 13 mm H7 DIN 206
Hand reamer 7 mm H7 DIN 206 (Lockingpin holes)
Hand reamer 6 mm H7 DIN 206
Hand reamer 5 mm H7 DIN 206
Hand reamer 4 mm H7 DIN 206
Thread-cutting die DIN 223 M 15 X 1 (formuzzle threads)
Cutting die support size 5 (to hold # 36above)
Hexagonal socket wrench
Set of pin punches:
Pin punch, 6 mm
Pin punch, 5 mm (barrel grip/magazinerelease lever)
Pin punch, 4 mm (Front sight, cocking leveraxle, barrel grip, bolt carrier locking lever)
Pin punch, 3.5 mm
952658
952653 tr
315917 f?
9 5 6 8 6 0
953583
953513
953502
953498
953476
951060
955427
957352
958428
957315
958215
957942
Denotes item(s) not pictured in illustration
Please call for price and availability
Revised 2/9837
HK2lE Illustration 12
Machine Gun Special tools, gauges and fixturesfor the HKI 1 E/Z1 E Machine Gun (cont.)
Item # Parts Description Part #
Set of drift punches:
Drift punch, 2.4 mm (magazine attachment,HKI 1 E only)
Drift punch, I .8 mm (rear sight, holder forlocking roller)
Drift punch, I .4 mm (disconnector/boltrelease)
Drift punch, 0.9 mm
Set of dowel pin holders:
Dowel pin holder, 0.1 mm
Dowel pin holder, 1.5 mm
Dowel pin holder, 2.2 mm (rear sight,holder for locking rollers)
Dowel pin holder, 2.8 mm (magazineattachment, HKI 1 E only)
Dowel pin holder, 3 mm
Dowel pin holder, 3.5 mm
Dowel pin holder, 4.2 mm
Dowel pin holder, 5 mm (magazine releaselever, HKl 1 E only)
Set of allen wrenches:
Allen wrench SW5 DIN 911, 5 mm (barrel)
Allen wrench SW4 DIN 911,4 mm
Allen wrench SW3 DIN 911, 3 mm
Set of circlip fitting tools:
Circiip fitting tool GRS 1.9 DIN 6799
Circlip fitting tool GRS 2.3 DIN 6799
Circlip fitting tool GRS 3.2 DIN 6799
Denotes item(s) not pictured in illustration
Please call for price and availability 38
957311
957310
957309
957308
318267
318268
301105
300591
318264
318271
300767
318262
957430
957429
957428
955772
955545
955544 u
Revised 2/98
HK2lE Illustration 12
Machine Gun Special tools, gauges and fixturesfor the HKI 1 E/21 E Machine Gun (cont.)
Item # Parts Description Part #
+
+
44
Circlip fitting tool GRS 4.0 DIN 6799
Circlip fitting tool GRS 5.0 DIN 6799
Center punch (barrel, recoil spring guiderod)
955605 =
955606 e
957323
( ) - indicates maintenance procedure this item used for.
+ Denotes item(s) not pictured in illustrationTT Please call for price and availability 39
Revised 2/98