Product Overview
A Series 23 elbow that turns a vacuum line 45 degrees and then gets out of the way
Condition
Unused new old stock (NOS). The photographed piece is representative of the four in stock. Under the lights it reads as a dull machined stainless surface with fine circumferential tool lines around the tangent ends and a few light scuffs along the outer bend; both weld lands are clean and round, and the bore is clear with no dents, no galling and no thread damage anywhere in view. No part number, heat number or maker's mark is visible in these photos, which is normal for butt weld fittings - the identity comes from the catalogue number, not from a stamp on the part. A vacuum-fitting distributor lists this part number as mechanically polished; the photos show a working machined finish rather than a bright one, so buy it for the dimensions and not for the shine.
Same or next business day shipping from our Idaho warehouse. Honest pricing, no nonsense.
Online since 1999. We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
The MKS (HPS) 1002345WT150 is a 45 degree butt weld elbow with tangents from the MKS Series 23 vacuum fitting line, sized for 1.50 inch outside diameter tube with a 0.065 inch wall in type 304 stainless steel. MKS describes the series as formed from welded, drawn and annealed stainless tubing, joined using 100 percent penetration TIG weld technique and carefully cleaned for high vacuum use. The "WT" in the ordering number is what separates this piece from the plain 1002345150: it carries a straight tangent section at each end, so the welder has a parallel land to butt against the adjoining tube instead of trying to start an arc on the curve. A vacuum-fitting distributor publishes A = 1.63 inches and B = 0.69 inches alongside the 1.50 inch OD; B is generally the tangent length on MKS 45 degree elbow drawings, though MKS's drawing defining those letters is not reproduced here, so treat the tangent reading as probable rather than confirmed. Sold each, four on the shelf.
Key Features
- MKS (HPS) 1002345WT150, Series 23 butt weld 45 degree elbow with tangents
- Tube size: 1.50 inch outside diameter
- Wall thickness: 0.065 inch (MKS family data for this size)
- Material: type 304 stainless steel, not 316
- Construction: welded, drawn and annealed tubing, 100 percent penetration TIG welds, cleaned for high vacuum use (per MKS)
- Straight tangent land at each end for butt welding to adjoining tube
- Published dimensions: A = 1.63 in, B = 0.69 in, OD = 1.50 in
- Unmarked body - no part number or maker's mark visible in these photos
- Pressure, temperature, leak rate and surface roughness figures: not confirmed - verify against the datasheet before use
Applications
- A vacuum technician routing 1.5 inch tube around a pump stand and needing a 45 degree offset welded in rather than a bolted joint that can leak
- A semiconductor process tool rebuild where the original Series 23 elbow was cut out and the replacement has to match the same OD and wall
- A university lab fabricating a high vacuum manifold on a budget, buying the exact elbow count the drawing calls for
- A research shop keeping a small stock of 304 weld fittings on the shelf so a chamber modification does not wait three weeks on a distributor
Frequently Asked Questions
Is the part number marked on the elbow?
No. Nothing is visible on the body in these photos - no part number, no heat code, no maker's mark. Butt weld fittings usually arrive that way, since the marking would sit in the weld zone. The 1002345WT150 identity here comes from our catalogue record and the dimensions, so if your paperwork requires a traceable heat number, this is not the piece for that job.
What is the difference between 1002345WT150 and 1002345150?
The WT version, which is what this is, has the straight tangent sections on both ends. The number without WT is the same 45 degree elbow in the same size without them. If your fixture or your welder wants a parallel land to butt up to, you want the tangents.
Is it 316 stainless?
No, it is 304. Both MKS and the distributor listings for this number say 304 stainless, and we are not going to upgrade that claim to sell it faster.
Is it really polished?
A vacuum-fitting distributor titles this part number as mechanically polished, and MKS's own family page mentions cleaning for high vacuum use without naming a finish. The photos show a dull machined surface with visible tool lines. We have no Ra number to give you, so if surface roughness is part of your spec, verify against the datasheet before use.
Why buy four here instead of a box of ten somewhere else?
Because a chamber modification needs the elbows the drawing calls for and not six spares living in a drawer for the next decade. There are four of these on the shelf and you can take one, two, three or all four, unused NOS, at a surplus price instead of a catalogue one. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Series 23 fittings were built to be welded into a line and then completely forgotten, which is about the highest compliment a vacuum joint ever receives. Lay your bead, pull your vacuum, and let this one start its quiet career of changing your mind by 45 degrees.
