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Simpson Strong-Tie HU1.81/5 Heavy Face-Mount Joist Hanger, 1-3/4 in. x 5-1/2 in. LVL/LSL
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HU1.81/5 Heavy Face-Mount Joist Hanger, 1-3/4 in. x 5-1/2 in. LVL/LSL
The HU1.81/5 is Simpson Strong-Tie's heavy face-mount hanger sized for a 1-3/4 in. x 5-1/2 in. LVL/LSL carried member. The hanger nails to the face of the header, so it can go in after the header is set, and the 14-gauge seat carries more load than a light U-hanger of the same size.
This listing is the standard G90 galvanized finish, for dry, interior framing. Sloped, skewed and ZMAX versions are special order from Simpson; contact us for a quote.
Features and Common Uses
- 14-gauge galvanized steel face-mount hanger for heavy joists, beams and headers
- Round and triangle nail holes: fill the round holes for standard loads, add the triangle holes for Simpson's maximum values
- Joists sloped up to 1/4:12 still achieve the published table loads
- Tested, load rated and code listed by Simpson Strong-Tie (ICC-ES ESR-2552)
Commonly used for:
- LVL, LSL and I-joist members hung from a beam
- Flush beams in engineered floor systems
- Joist-to-girder connections
Specifications
| Brand | Simpson Strong-Tie |
|---|---|
| Model | HU1.81/5 |
| Carried member | 1-3/4 in. x 5-1/2 in. LVL/LSL |
| Gauge | 14 ga. |
| Width (W) | 1-13/16 in. |
| Height (H) | 5-3/8 in. |
| Seat depth (B) | 2-1/2 in. |
| Header fasteners | (12) min. / (16) max. 0.162 in. x 3-1/2 in. |
| Joist fasteners | (4) min. / (6) max. 0.148 in. x 1-1/2 in. |
| Finish | Zinc galvanized, G90 |
Dimensions, fastener schedule and allowable loads are from Simpson's catalogue table for the HU1.81/5. Loads vary by lumber species, load duration and nailing option; confirm the value for your design before install. Source: Simpson Strong-Tie Wood Construction Connectors Catalog C-C-2026, pp. 156-157 (PDF).
How to Install
- Confirm the hanger matches the carried member and that the header is deep enough to take every header nail in the table.
- Hold the hanger tight to the header face with the seat at the joist bottom and nail it off through the round header holes.
- Drop the joist in with no more than a 1/8 in. gap at the header and nail through the joist flanges.
- Where the design calls for Simpson's maximum values, fill the triangle holes in the header and joist as well.
Full installation notes, fastener substitutions and load tables: Source: Simpson Strong-Tie Wood Construction Connectors Catalog C-C-2026, pp. 156-157 (PDF).
Frequently Asked Questions
Which nails do I need?
Header: (12) min. / (16) max. 0.162 in. x 3-1/2 in. Joist: (4) min. / (6) max. 0.148 in. x 1-1/2 in. Use the exact sizes Simpson specifies; a shorter or thinner nail lowers the allowable load. Simpson's catalogue table lists the load for each nailing option.
Round holes only, or triangle holes too?
Round holes give the standard table loads. Filling the triangle holes as well gives Simpson's higher maximum values, so fill them whenever the load calls for it.
Can I use it on a pressure-treated deck?
Not this finish. G90 galvanizing is for dry, interior framing. For preservative-treated lumber or exterior exposure, Simpson calls for ZMAX, hot-dip galvanized or stainless steel connectors and matching fasteners. Ask us about the ZMAX or stainless version.