Flat plate fitting · 1-5/8 in. series
P1065 — 2-Hole Flat Plate Fitting, 3-1/2 in.
A flat 3-1/2 x 1-5/8 in. plate of steel with two 9/16 in. holes on 1-7/8 in. centers. It lies across the open face of two channels that meet in the same plane and ties them with one bolt into each.
By Alex · Last reviewed 2026-09-25 · Spec looks wrong? Tell us.
- Size
- 3-1/2 × 1-5/8 in. (88.9 × 41.3 mm)
- Holes
- 2 × 9/16 in. (14.3 mm) on 1-7/8 in. (47.6 mm) centers
- Steel
- About 0.23 in. (5.8 mm) base steel before coating; a hot-dip galvanized part measures thicker; catalog reference part 1/4 in. (6.4 mm)
- Fits
- 1-5/8 in. series strut channel
- Catalog ref.
- Unistrut® GEC no. 17, pp. 85, 90
Dimensions above are the catalog specification for the reference part; the steel line is our supply. Steel grade is confirmed at quotation.
P1065-EG — electro-galvanized, zinc plating to ASTM B633 Type III SC1. Smooth bright silver. Indoor and dry service. P1065-HG — hot-dip galvanized to ASTM A123 or A153. Visible spangle, heavier edge build-up. Outdoor, wet and coastal service. P1065-PL — plain, uncoated steel. For painting or powder coating after assembly, or dry enclosed runs. Stainless — the catalog offers stainless, aluminum and fiberglass on some part numbers but publishes no standard suffix for them and says to consult the factory. Quote as made-to-order. Powder-coated — powder coating to a customer-specified RAL color. Not a catalog finish, so it carries no catalog code — the color, which parts take it and the film build are confirmed at quotation. We publish no film thickness and no salt-spray figure, because we have not measured one.
Finish list: Unistrut® General Engineering Catalog no. 17, p. 85 — finishes note. Powder coating is our option, not a catalog finish. The catalog also lists GR against this series — not quoted, see Finishes.
Pack: Packed per order. Two cap screws and two channel nuts per plate, ordered separately.
Catalog figures for the reference part, with where each one comes from. Our supply thickness is in Supply summary.
| Dimension | Catalog value (reference part) | Source |
|---|---|---|
| Size | 3-1/2 x 1-5/8 in. (88.9 x 41.3 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — printed on the part drawing |
| Hole count | 2 | Unistrut® General Engineering Catalog no. 17, p. 90 — printed on the part drawing |
| Hole diameter | 9/16 in. (14.3 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — standard-dimensions note in the page header |
| Hole spacing on center | 1-7/8 in. (47.6 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — standard-dimensions note in the page header |
| Hole center from the free end | 13/16 in. (20.6 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — standard-dimensions note in the page header |
| Width | 1-5/8 in. (41.3 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — standard-dimensions note in the page header |
| Material thickness | 1/4 in. (6.4 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — standard-dimensions note in the page header |
| Steel | ASTM A575 / A576 / A635 / A36 | Unistrut® General Engineering Catalog no. 17, p. 85 — fittings material note — also meets the physical requirements of A1011 SS GR 33 |
| Hole position across the width | not published | The p. 90 drawing shows the holes on the centerline of the plate but does not dimension it. |
| Corner radius | not published | Not dimensioned on p. 90. |
| Tapped variant | not published | P1065 is drilled. The tapped plates on the same p. 90 are separate part numbers with their own 3/8 in. thickness note. |
The three hole figures come from the p. 90 header note rather than from the P1065 drawing, and they check against the drawing: 13/16 + 1-7/8 + 13/16 in. is exactly the 3-1/2 in. overall length printed on it. That is a useful property of this part — the length itself tells you whether the punching is on the series pattern.
What bolts through it, and where the published data stops.
Hardware. Two 1/2 x 15/16 in. hex head cap screws and two 1/2 in. channel nuts — P1010, P4010 or P5510 by channel depth. Not supplied with the plate.
Where it goes. Flat on the open face, bridging a joint between two channels that are in the same plane: two lengths butted end to end, or a diagonal brace landing on a run. It is not a fitting for two channels at right angles to each other — that is a bent angle, not a flat plate.
Twist. Two bolts in a line resist rotation about the plate, which is the point of the two-hole version; one bolt in each channel does not. On a butt splice the plate is carrying the joint in shear through two bolts and the connection is only as good as the nuts under it, so use the correct nut for the channel depth and tighten both.
Load rating. The catalog publishes no load figure for P1065, so neither do we. A splice is the connection where an assumed rating does the most damage: if the run is carrying anything that matters, have the joint checked rather than inferred.
What the published cross-reference tables print opposite P1065.
| Brand | Published cross-reference part number |
|---|---|
| B-Line | B129 [S1][S2][S3] |
| Superstrut | AB206 [S1][S3] |
| Power-Strut | PS 601 [S1][S2][S3] |
| Haydon | F-203 [S3] |
A published cross-reference number is one thing only: a number a cited document prints opposite this one, as a candidate substitute in the same catalog slot. It carries no load rating, steel grade, coating thickness or third-party listing — each manufacturer publishes those separately and they do not travel with a part number. Source documents, access dates and what to measure before you fit a substitute: Unistrut P1065 cross reference.
Source: our cross-reference dataset, built 2026-09-09 from the documents listed below.
What a P1065 actually is
A rectangle of steel plate, as wide as the channel and 3-1/2 in. long, with two holes punched on the standard 1-7/8 in. centers of the series. There is no bend, no gusset and no weld; it is the flat two-hole member of the plate family and it is what most people mean when they say “splice plate” about strut.
Because the holes sit on the same pitch as the punching in T-series channel and the same pitch as the two-hole fittings, the plate lines up with anything else on the series pattern. That is the whole design: one pitch, 1-7/8 in., running through the punched channel, the fittings and this plate, so parts from different corners of the catalog land on the same bolt centers.
Choosing between P1065 and what sits next to it
The one-hole square plate, P1064, clamps a single item to a single channel. P1065 ties two things together. If you are tempted to use two P1064s in place of one P1065, the difference is that the single plate cannot stop the two channels rotating relative to each other, because each plate is pinned by one bolt.
Where the two channels meet at a right angle out of plane, none of the flat plates is the answer — that is P1026 or another bent angle. Where they meet in plane at a corner and the joint has to resist opening, the catalog's four-hole gusset plate P1962 is the heavier option.
For a butt splice in a run that carries anything, remember what a splice does: it moves the whole load path through two bolts and a plate. Two plates, one on each face where the channel geometry allows it, is the standard way of making that joint less dependent on a single set of lips.
Checking an incoming shipment
Four checks, and the second is the one that matters most.
1. Measure the overall length: 3-1/2 in. (88.9 mm). A rule is enough. On this part the length is also a punching check, because the catalog pattern makes 13/16 + 1-7/8 + 13/16 in. add exactly to the overall length.
2. Measure hole center to hole center: 1-7/8 in. (47.6 mm). Measure between the same edge of each hole if you have no center punch — edge to matching edge equals center to center. Get this wrong and neither bolt lands cleanly in a nut, and a plate that is a sixteenth out will still bolt up on a bench and will not on a run.
3. Caliper the thickness and compare it with the thickness on your quotation. Anywhere; the plate is flat. The tapped group on the same catalog page is 3/8 in. thick, so a plate that measures thick is not necessarily wrong — it is probably a different part number. Our standard plate is about 0.23 in. (5.8 mm) base steel before coating; a hot-dip galvanized part measures thicker. The catalog reference part is 1/4 in. (6.4 mm). Compare the base-steel thickness on your quotation; measure a galvanized part knowing the coating adds to it. A 3/16 in. (4.8 mm) plate looks the same in a bin — that is the one to reject.
4. Measure the width: 1-5/8 in. (41.3 mm). It must match the channel face so the plate bears on both lips.
Then, before it goes into stock, check the finish matches the run it is going into — a plain plate bolted into a galvanized splice outdoors is the first thing on the job to rust, and it is sitting at the joint.
Related parts
- P1064 — The one-hole square version of the same plate.
- P1026 — The bent 90° angle, for channels meeting out of plane.
- P1000 — The channel this plate is drawn against.
- All flat plate fittings — The plate group on the fittings table.
- Finish options — PL, EG, HDG and stainless, and which of them we can supply.
What we can quote against this part number
We do not manufacture these parts and we are not Unistrut. We source them. The item we can quote against Unistrut P1065 is flat plate fitting, 3-1/2 x 1-5/8 in., two 9/16 in. holes — a candidate substitute made to order by a contract manufacturer, offered for inquiry, not an original-manufacturer part.
| Dimension | Value | Source |
|---|---|---|
| Size | 3-1/2 x 1-5/8 in. (88.9 x 41.3 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — printed on the part drawing |
| Holes | 2, 9/16 in. (14.3 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — printed on the part drawing and Unistrut® General Engineering Catalog no. 17, p. 90 — standard-dimensions note in the page header |
| Hole spacing on center | 1-7/8 in. (47.6 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — standard-dimensions note in the page header |
| Width | 1-5/8 in. (41.3 mm) | Unistrut® General Engineering Catalog no. 17, p. 90 — standard-dimensions note in the page header |
| Thickness | About 0.23 in. (5.8 mm) base steel before coating; a hot-dip galvanized part measures thicker. Steel grade confirmed at quotation. | Our supply specification — not a catalog figure |
These are the published Unistrut catalog dimensions we build to, each with the page it is printed on. The thickness row is the exception: it states what we supply, not a catalog figure. They are geometry only. No load, torque or listing figure is claimed for our part: none has been tested on it, and a figure published for a Unistrut part is evidence about that part, not about ours.
Supply summary
What is known about supplying this part number, and nothing that is not. Anything missing from this list is missing because we do not have it yet, not because it was left out.
- Reference part
- Unistrut® P1065, as published in the Unistrut® General Engineering Catalog no. 17
- What we quote against it
- flat plate fitting, 3-1/2 x 1-5/8 in., two 9/16 in. holes — a candidate substitute made to order by a contract manufacturer, offered for inquiry, not an original-manufacturer part.
- Plate thickness
- About 0.23 in. (5.8 mm) base steel before coating; a hot-dip galvanized part measures thicker. Steel grade confirmed at quotation.
- Finishes available
- Plain, EG, HDG and stainless, plus powder coating on request.
- Documents we can provide
- A dimension drawing traced from the catalog page cited above. A material certificate on request — availability and cost are confirmed at quotation, per mill.
- Lead time
- Production lead time: 5–7 business days, ex-factory. Counted from order confirmation and receipt of deposit (or drawing approval for custom parts, whichever is later). This does not include transit.
- How to confirm fit
- Measure the incoming parts against "Checking an incoming shipment" on this page, before the carton goes into stock.
Get this part number quoted
Answer the seven lines below and we come back with our part number, finish options, lead time, packing quantity and what documentation we can and cannot supply. There is no list price — it is quoted per mill, finish and volume. The form takes about a minute and already knows this part number. We reply within one business day (Asia/Shanghai, UTC+8).
- Unistrut part number — P1065
- The brand and part number you are replacing
- Finish
- Quantity
- Destination — country, and state or ZIP if US
- Application — general support, electrical, mechanical, seismic, or a listed assembly
- Whether you need submittal documentation
No minimum order · 5–7 business days ex-factory · Reply within one business day (Asia/Shanghai, UTC+8) · Finishes: plain, EG, HDG, stainless
Prefer email? Open a prefilled RFQ in your mail client, or write to contact@channelstrut.com yourself. If the part is going into a specification that names a brand, say so — a substitute has to be accepted in writing before it ships.
Trademarks and who we are
Unistrut, B-Line, Superstrut, Power-Strut and Haydon, and the part numbers published under them, are trademarks or trade names of their respective owners. ChannelStrut is not affiliated with, authorized by, endorsed by or a distributor for any of them. Those brand names and part numbers are used here only to identify the products referred to.
ChannelStrut is run by Alex, a hardware sourcing specialist based in Fujian, China. We do not manufacture these parts — we source them from the mills that produce them. More on how the data is built: About.
Sources
The cross-brand part numbers in the cross-reference tab come from S1, S2 and S3. Every dimension on this page comes from the Unistrut® General Engineering Catalog no. 17, and the page it is printed on is given beside it.
- S1
- Divspec - Strut Fitting Cross Reference (Divspec / B-Line / Unistrut / Powerstrut / Superstrut(Thomas & Betts))
http://www.divspec.com/strut-fitting-cross-reference/
third-party aggregator · accessed 2026-09-09 - S2
- Eugene Fastener - Strut Cross-Reference: Unistrut, B-Line, PowerStrut & More
https://www.eugenefast.com/home/page/resources/strut-channel-cross-reference
third-party aggregator (distributor) · accessed 2026-09-09 - S3
- Master Distribution - Part Number Cross Reference Guide (G-Strut / Unistrut / Powerstrut / Superstrut / Erico / B-Line / PHD / Haydon), 23 pages
https://masterdistrib.com/content/PDF/Masterdistrib_Part_Number_Cross_Reference_Guide.pdf
third-party aggregator · accessed 2026-09-09
Every source above was re-checked for reachability on 2026-09-15.
Unistrut P1065 cross reference — what the published guides print opposite it, and what to measure on a substitute, or the full 126 part-number table.