Product Description
Armstrong Casing Capscrew – Part No. 911129-112
Genuine Armstrong replacement casing capscrew, Armstrong part number 911129-112, for Series 4380, 4280, 4280-50, 4030, 4300, 4600 pumps. Shown as item 104 on the Series 4380 drawing (parts list 6043.129 / 6043.130) – highlighted in the pictures above.
* Please confirm before ordering: this number is printed this way in Armstrong’s Series 4380 parts list but looks inconsistent. Call us with your pump serial number to confirm.
- Listed as “3×1½×8” in the parts list.
Specification: ⅝"-11NC × 1½"; ⅝"-11NC × 1½" lg. hex hd.; ⅝"-11NC × 1½" lg.
Fits these Armstrong pumps
- Series 4380 (vertical in-line) – pump sizes 1½ × 1½ × 8, 2 × 2 × 8, 4 × 4 × 8, 5 × 5 × 8, 6 × 6 × 8W, 8 × 8 × 8, 1½ × 1½ × 10, 2 × 2 × 10, 3 × 3 × 10, 4 × 4 × 10, 6 × 6 × 10, 8 × 8 × 10, 3 × 3 × 13, 4 × 4 × 13, 5 × 5 × 13, 5 × 5 × 13H, 6 × 6 × 13, 6 × 6 × 13H, 8 × 8 × 13, 3 × 3 × 8
- Designation: 'M'
- Motor frames: 213JP, 215JP, 254JM, 256JM, 284JP, 286JP, 284JM, 286JM, 324JM, 326JM
- Drawing item: 104
- Series 4280 (close coupled end suction) – pump sizes 1½ × 1 × 8, 3 × 1½ × 8, 3 × 2 × 8, 3 × 2½ × 8, 4 × 3 × 8, 5 × 4 × 8, 6 × 4 × 8W, 8 × 8 × 8, 2 × 1 × 10, 2 × 1½ × 10, 3 × 1½ × 10, 3 × 2 × 10, 3 × 2½ × 10, 4 × 3 × 10, 5 × 4 × 10, 6 × 4 × 10, 6 × 5 × 10, 8 × 6 × 10, 3 × 1½ × 13, 3 × 2 × 13, 4 × 3 × 13, 6 × 4 × 13, 6 × 4 × 13H, 6 × 5 × 13, 6 × 5 × 13H, 8 × 6 × 13
- Drawing item: 104
- Series 4280-50 (pool & spa (NSF-50)) – pump sizes 1½ × 1 × 8, 3 × 1½ × 8, 3 × 2 × 8, 3 × 2½ × 8, 4 × 3 × 8, 5 × 4 × 8, 6 × 4 × 8, 8 × 8 × 8, 2 × 1 × 10, 2 × 1½ × 10, 3 × 1½ × 10, 3 × 2 × 10, 3 × 2½ × 10, 4 × 3 × 10, 5 × 4 × 10, 6 × 4 × 10, 6 × 5 × 10, 8 × 6 × 10
- Drawing item: 104
- Series 4030 (base mounted end suction) – pump sizes 1½ × 1 × 8, 3 × 1½ × 8, 3 × 2 × 8, 3 × 2½ × 8, 4 × 3 × 8, 5 × 4 × 8W, 6 × 4 × 8W, 6 × 5 × 8, 8 × 8 × 8, 2 × 1 × 10, 2 × 1½ × 10, 3 × 1½ × 10, 3 × 2 × 10, 3 × 2½ × 10, 4 × 3 × 10, 5 × 4 × 10, 6 × 4 × 10, 6 × 5 × 10, 8 × 6 × 10W, 3 × 1½ × 13, 3 × 2 × 13, 4 × 3 × 13, 4 × 3 × 13L, 6 × 4 × 13, 6 × 4 × 13H, 6 × 5 × 13, 6 × 5 × 13H, 8 × 6 × 13, 10 × 8 × 13
- Drawing item: 104
- Series 4300 (vertical in-line) – pump sizes 1½ × 1½ × 8, 2 × 2 × 8, 3 × 3 × 8, 4 × 4 × 8, 5 × 5 × 8, 6 × 6 × 8, 8 × 8 × 8, 2 × 2 × 10, 3 × 3 × 10, 4 × 4 × 10, 6 × 6 × 10, 8 × 8 × 10, 4 × 4 × 11½, 5 × 5 × 11½, 6 × 6 × 11½, 8 × 8 × 11½, 3 × 3 × 13, 4 × 4 × 13, 5 × 5 × 13, 5 × 5 × 13H, 6 × 6 × 13, 6 × 6 × 13H, 8 × 8 × 13, 10 × 10 × 13, 8 × 8 × 15, 10 × 10 × 15
- Designation: 'M'
- Motor frames: 364TSC, 365TSC, 324TSC, 326TSC, 324TC, 326TC, 364TC, 365TC, 404TSC, 405TSC, 444TSC, 445TSC, 404TC, 405TC, 444TC, 445TC, 447TC, 449TC
- Drawing item: 104, 44
- Series 4600 (horizontal split case) – pump sizes 5 × 4 × 10L, 6 × 5 × 10H, 6 × 5 × 10L, 8 × 6 × 10L, 8 × 6 × 10H, 10 × 8 × 11L, 10 × 8 × 11H, 5 × 4 × 12L, 5 × 4 × 12H, 6 × 5 × 12L, 6 × 5 × 12H, 8 × 6 × 12½L, 8 × 6 × 12½H, 12 × 10 × 12½H, 10 × 8 × 14L, 10 × 8 × 14H, 6 × 5 × 15L, 6 × 5 × 15H, 8 × 6 × 15L, 8 × 6 × 15H, 12 × 10 × 15H, 12 × 8 × 18
- Drawing item: 47, 59
Other parts for this pump
Rebuilding a Series 4380 1½ × 1½ × 8? These parts are often replaced at the same time:
| Item | Part | Armstrong part no. |
|---|---|---|
| 15 | Set screw | 916517-005 |
| 16 | Set screw | 916519-104 |
| 17 | Set screw | 916517-205 |
| 21 | Shaft extension | 426992-071 |
| 36 | Shaft key | 974515-400 |
| 39 | Water slinger | 406622-000 |
| 40 | Stuffing box / adapter | 426749-011 |
| 40 | Stuffing box / adapter | 426749-031 |
| 43 | Motor washer | 927113-100 |
| 44 | Motor capscrew | 911121-108 |
| 57 | Male connector | 939001-114 |
| 59 | Flush line tubing | 997531-004 |
| 62 | Mechanical seal kit | 975000-982 |
| 62 | Mechanical seal kit | 9975001-813 |
| 62 | Mechanical seal kit | 9975001-613 |
| 62 | Mechanical seal kit | 9975001-817 |
| 62 | Mechanical seal kit | 9975001-818 |
| 70 | Shaft sleeve | 425869-001 |
| 71 | Shaft sleeve spacer | 425868-005 |
| 80 | Impeller | 427119-041 |
| 83 | Impeller washer | 425742-001 |
| 86 | Impeller capscrew | 911900-114 |
| 90 | Case wear ring | 426413-402 |
| 100 | Casing | 427045-011 |
Showing 24 of 28 parts – see the full list in the parts finder.
Not sure this is the right part?
Use our Armstrong Pump Parts Finder: choose Series 4380, your pump size and motor to see every part on the drawing. Or send us your pump’s nameplate details – call (416) 236-2338 or email sales@bramhambros.com. Bramham Bros is an authorized Armstrong dealer.
Product Videos
Custom Field
Brand Armstrong
Armstrong Part Number 911129-112
Part Type Hardware / Fitting
Fits Series 4380 (1) 1-1/2 x 1-1/2 x 8, 2 x 2 x 8, 4 x 4 x 8, 5 x 5 x 8, 6 x 6 x 8W, 8 x 8 x 8, 1-1/2 x 1-1/2 x 10, 2 x 2 x 10, 3 x 3 x 10, 4 x 4 x 10, 6 x 6 x 10, 8 x 8 x 10, 3 x 3 x 13, 4 x 4 x 13, 5 x 5 x 13, 5 x 5 x 13H, 6 x 6 x 13, 6 x 6 x 13H, 8 x 8 x 13
Fits Series 4380 (2) 3 x 3 x 8
Fits Series 4280 (1) 1-1/2 x 1 x 8, 3 x 1-1/2 x 8, 3 x 2 x 8, 3 x 2-1/2 x 8, 4 x 3 x 8, 5 x 4 x 8, 6 x 4 x 8W, 8 x 8 x 8, 2 x 1 x 10, 2 x 1-1/2 x 10, 3 x 1-1/2 x 10, 3 x 2 x 10, 3 x 2-1/2 x 10, 4 x 3 x 10, 5 x 4 x 10, 6 x 4 x 10, 6 x 5 x 10, 8 x 6 x 10
Fits Series 4280 (2) 3 x 1-1/2 x 13, 3 x 2 x 13, 4 x 3 x 13, 6 x 4 x 13, 6 x 4 x 13H, 6 x 5 x 13, 6 x 5 x 13H, 8 x 6 x 13
Fits Series 4280-50 1-1/2 x 1 x 8, 3 x 1-1/2 x 8, 3 x 2 x 8, 3 x 2-1/2 x 8, 4 x 3 x 8, 5 x 4 x 8, 6 x 4 x 8, 8 x 8 x 8, 2 x 1 x 10, 2 x 1-1/2 x 10, 3 x 1-1/2 x 10, 3 x 2 x 10, 3 x 2-1/2 x 10, 4 x 3 x 10, 5 x 4 x 10, 6 x 4 x 10, 6 x 5 x 10, 8 x 6 x 10
Fits Series 4030 (1) 1-1/2 x 1 x 8, 3 x 1-1/2 x 8, 3 x 2 x 8, 3 x 2-1/2 x 8, 4 x 3 x 8, 5 x 4 x 8W, 6 x 4 x 8W, 6 x 5 x 8, 8 x 8 x 8, 2 x 1 x 10, 2 x 1-1/2 x 10, 3 x 1-1/2 x 10, 3 x 2 x 10, 3 x 2-1/2 x 10, 4 x 3 x 10, 5 x 4 x 10, 6 x 4 x 10, 6 x 5 x 10
Fits Series 4030 (2) 8 x 6 x 10W, 3 x 1-1/2 x 13, 3 x 2 x 13, 4 x 3 x 13, 4 x 3 x 13L, 6 x 4 x 13, 6 x 4 x 13H, 6 x 5 x 13, 6 x 5 x 13H, 8 x 6 x 13, 10 x 8 x 13
Fits Series 4300 (1) 1-1/2 x 1-1/2 x 8, 2 x 2 x 8, 3 x 3 x 8, 4 x 4 x 8, 5 x 5 x 8, 6 x 6 x 8, 8 x 8 x 8, 2 x 2 x 10, 3 x 3 x 10, 4 x 4 x 10, 6 x 6 x 10, 8 x 8 x 10, 4 x 4 x 11-1/2, 5 x 5 x 11-1/2, 6 x 6 x 11-1/2, 8 x 8 x 11-1/2, 3 x 3 x 13, 4 x 4 x 13
Fits Series 4300 (2) 5 x 5 x 13, 5 x 5 x 13H, 6 x 6 x 13, 6 x 6 x 13H, 8 x 8 x 13, 10 x 10 x 13, 8 x 8 x 15, 10 x 10 x 15
Fits Series 4600 (1) 5 x 4 x 10L, 6 x 5 x 10H, 6 x 5 x 10L, 8 x 6 x 10L, 8 x 6 x 10H, 10 x 8 x 11L, 10 x 8 x 11H, 5 x 4 x 12L, 5 x 4 x 12H, 6 x 5 x 12L, 6 x 5 x 12H, 8 x 6 x 12-1/2L, 8 x 6 x 12-1/2H, 12 x 10 x 12-1/2H, 10 x 8 x 14L, 10 x 8 x 14H, 6 x 5 x 15L
Fits Series 4600 (2) 6 x 5 x 15H, 8 x 6 x 15L, 8 x 6 x 15H, 12 x 10 x 15H, 12 x 8 x 18
Drawing Item 4030: item 104; 4280: item 104; 4300: item 104, 44; 4380: item 104; 4600: item 47, 59; 4280-50: item 104
Specification 5/8"-11NC x 1-1/2"; 5/8"-11NC x 1-1/2" lg. hex hd.; 5/8"-11NC x 1-1/2" lg.
Note * Confirm before ordering - printed inconsistently in Armstrong parts list
Shipping cost: Inquire
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