Welch · Screw / bolt / nut
4-40-1200
STEEL BALL 3/8” DIA. LOCK NUT
Where to get it
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As printed in the source
15 | 1 | 4-40-1200 | 1 | 1 | STEEL BALL 3/8” DIA. | 45 | 1 | 41-2757 | LOCK NUT
Fits 1 model
As listed by Welch| Model | Source |
|---|---|
| DuoSeal 1405 | duoseal 1405 manual, p. 17 |
When ordering, give the model and serial number from the nameplate: some parts changed within a model’s life.
Where it sits
In the DuoSeal 1405
8 · Screws, washers, pins
- SCREW SOCKET HD 10-32 x 3/4” LG. SCREW #6-1/4 SELF TAPPING2-00-6712
- SCREW HEX HD 1/4”-20 X 7/8” LG. THRUST DISK2-01-0114
- SCREW HEX HD 5/16-18 x 3-1/4”” LG.. PULLEY w/ SET SCREW2-01-0356
- WASHER, STEEL 3/16 BAFFLE ASSEMBLY2-61-0000
- WASHER, LOCK 1/4” MEDIUM SETSCREW 1/4-20 x 2.25” LG2-63-0193
- WASHER, THRUST EXHAUST RING41-0508
- WOODRUFF KEY #404 PRESSURE RELEASE TUBE #141-0613
- WOODRUFF KEY PRESSURE RELEASE TUBE #241-0624
- STEEL BALL 3/8” DIA. LOCK NUT4-40-1200
Our drawing of the machine type, with the DuoSeal 1405's own parts; this part is highlighted. Side view along the shaft. Oil-free (dry) pumps have no exhaust box oil, sight glass or oil filter; their exhaust filter is a dust filter.
In the manufacturer’s drawings
- Position 15 · Section 8: EXPLODED VIEWduoseal 1405 manual, p. 16
Part number, name and fitment as published by Welch (source), retrieved 2026-10-19. Vac & Air is independent and not affiliated with the manufacturers shown; names and numbers identify the parts only.