Hand Tool Comparisons · Reviewed October 16, 2026
Swanson S0101 vs Empire 2990: Which 7-Inch Rafter Square?
Both are 7-inch aluminum layout squares made in the USA. Swanson machines its body and bundles the Blue Book; Empire uses solid extruded aluminum with deep-stamped markings and conversion tables.
Best for
Carpenters, roof-layout learners and DIYers choosing a compact aluminum square for 90-degree, 45-degree, angle and rafter layout work.
Probably not for
Certified inspection, precision machining, live saw contact, fall protection or using a square as a substitute for the tool manual and job plan.
Specifications at a glance
| Detail | Swanson S0101 | Empire 2990 |
|---|---|---|
| Nominal size | 7 inches | 7 inches |
| Construction | Heavy-gauge CNC-machined aluminum alloy | Solid extruded aluminum |
| Markings | Deep black-filled machined graduations on matte finish | Deep-stamped graduations |
| Scales / tables | Degree, common rafter and hip/valley scales | Conversion tables for common applications |
| Heel / scribing | 7/8-inch heel; 1/4-inch scribe bar | Solid heel; current page does not list scribe notches for 2990 |
| Included reference | Swanson Blue Book | Rafter-square manual available online |
| Origin / warranty | Made in Frankfort, Illinois; satisfaction guarantee | Made in USA with global materials; one-year limited warranty |
| Exact model | S0101, carded with Blue Book | 2990 |
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Swanson 7-Inch Speed Square (S0101)
A 7-inch heavy-gauge CNC-machined aluminum layout square with a matte surface, deep black-filled markings, 7/8-inch heel, 1/4-inch scribe bar and included Blue Book.
Pros
- Degree, common-rafter and hip/valley scales are documented
- Wide heel and quarter-inch scribe bar have published dimensions
- Pocket Blue Book is included with the exact S0101 package
Cons
- Published weight is 0.68 pound, which matters in a loaded pouch
- Dense rafter scales require learning rather than guessing
- Other S0101 package variants can omit or add accessories
Who it’s for: Choose S0101 when machined black-filled markings, the defined scribe bar and included reference book are priorities. Skip it if the lightest possible square is the main goal.
Check Swanson 7-Inch Speed Square (S0101) on Amazon Paid linkEmpire 7-Inch Rafter Square (2990)
A 7-inch solid extruded-aluminum rafter square with deep-stamped markings and conversion tables for common applications, made in the USA with global materials.
Pros
- Solid extruded-aluminum construction is clearly identified
- Deep-stamped marks and conversion tables are documented
- Simple 2990 model identity is distinct from Empire laser-etched versions
Cons
- Current 2990 page does not claim the Scribe-Guide notches found on newer Empire models
- One-year limited warranty is shorter than some premium tool warranties
- Deep-stamped layout is less visually filled than Swanson black markings
Who it’s for: Choose 2990 for a straightforward extruded square with stamped scales and tables. Skip it if the newer Empire laser-etched or notched feature set is required.
Check Empire 7-Inch Rafter Square (2990) on Amazon Paid linkBoth are seven-inch squares, but their bodies are made differently
Swanson describes S0101 as heavy-gauge CNC-machined aluminum alloy. Empire describes 2990 as solid extruded aluminum. Those manufacturing descriptions are useful because they distinguish the exact tools, but they do not establish a durability winner without a common test. Avoid transferring claims from Empire e2994 or another Swanson package to these models simply because the profiles look similar.
A seven-inch square is compact enough for common dimensional lumber and a tool pouch. It is not a replacement for a long framing square when the task needs a longer reference edge. Inspect the heel and edges before first use, and compare the square against a known method if layout accuracy is critical. A dropped or visibly damaged square should be checked again before it guides more marks.
Swanson emphasizes machined, filled markings
S0101 has a matte surface and recessed black-filled graduations. Swanson lists degree, common-rafter and hip/valley scales, plus a Diamond cutout. The manufacturer also publishes a 7/8-inch heel and a 1/4-inch scribe bar. These are concrete workflow details: the heel seats against an edge, while the scribe feature helps lay out a parallel line at fixed increments.
Black-filled marks may be easier to distinguish in some light, but readability remains personal and situational. Dust, pencil graphite and debris can obscure any scale. Wipe the face rather than scraping it with a blade. Before marking a rafter, identify the pivot, scale and reference edge in the included Blue Book. A dense face rewards a correct method and punishes hurried reading.
Empire 2990 keeps the feature set simpler
Empire lists 2990 as a seven-inch solid extruded-aluminum square with deep-stamped markings and conversion tables. The current manufacturer page does not list the Scribe-Guide notches or laser-etched face advertised for model e2994. That omission matters when comparing Amazon titles that use broad phrases such as Empire rafter square. Model 2990 should be chosen for the features Empire actually assigns to 2990.
The conversion tables can shorten common lookups, but a table is only useful when the input and units are understood. Read the online Empire rafter-square manual before treating any row as a cut instruction. Local building requirements, drawings and field conditions take priority. Neither square decides the structural design, lumber grade, roof load or safe work sequence for the user.
A heel is a reference, not a clamp
The raised heel registers the square against a straight board edge. Press it consistently without rocking, and check that bark, a rounded edge, fasteners or damage are not holding the square away from the work. If the board edge is not straight, the mark will inherit that error. The square can locate a line; it cannot repair an unsuitable reference surface.
Manufacturers often describe these tools as saw guides, but that use requires the saw manual, stable work support and a safe hand position. Keep the square clear of the moving blade and never place fingers in the cut path. Verify the offset between the saw shoe and blade on scrap. This guide does not claim either square was tested as a guide or that one produces a more accurate cut.
Rafter scales need a method behind them
Swanson explicitly publishes common-rafter and hip/valley scales and includes its Blue Book. Empire publishes conversion tables and provides a general rafter-square manual online. For a learner, the included Swanson reference may be the more convenient package. For someone already using a known layout procedure, Empire 2990 may provide all the required marks without carrying another booklet.
Do not copy a roof angle from a social clip without checking which scale and convention are being used. Pitch, degrees, rise per run and rafter tables are related but not interchangeable labels. Mark scrap first, verify the angle with the plan and make a test assembly when appropriate. The square is a layout aid, not an engineering calculation or authorization to alter a structure.
Package suffixes matter on the Swanson side
Swanson lists several related packages. S0101 is the carded square with Blue Book; S0101-BULK omits retail packaging, and S0101-C adds a Speed Clip. T0101 is a separate tag-carded variant with plain markings. The Amazon link in this guide is tied to B00002255O and the S0101 identity. Confirm the listing image and included booklet rather than assuming every seven-inch Swanson offer is identical.
Empire also sells 2990M, a metric version, plus 12-inch and newer laser-etched models. A seven-inch orange or blue square in a thumbnail is not enough identification. Match 2990 exactly if the comparison here is the basis for purchase. If metric graduations or laser-etched notches are the requirement, choose the corresponding model and treat it as a different decision.
Choose markings and reference material, then verify the tool
Choose Swanson S0101 when deep black-filled machined graduations, a published 1/4-inch scribe bar and the included Blue Book support the work. Choose Empire 2990 when a solid extruded-aluminum body, deep-stamped face and conversion tables meet the need without the newer laser-etched feature set. Both are compact seven-inch aluminum squares and both require correct technique.
The verified Amazon identifiers are B00002255O for S0101 and B0002YSAX8 for Empire 2990. Confirm the model, package and graduations before purchase. No price, stock, jobsite test, drop test, accuracy ranking or saw-cut performance measurement is claimed. If the project has an inspection or tolerance requirement, use the specified tool and verification process rather than this general buying guide alone.
Official sources and further reading
Sources reviewed on October 16, 2026. Prices, availability and terms can change; recheck before buying.
Commission disclaimer
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