Choosing a gauge calibration kit starts with the instrument you need to set and the level of traceability your work demands. I’d put the Accusize 36-piece set first for a documented general-purpose reference, choose TEXALAN for a traceable economy-grade block set, and look to Fowler’s bore gage master kit when the job centers on internal diameters. These kits differ in purpose: two are general gage block sets, while Fowler adds a dedicated setting fixture. The tradeoff is between broad block utility, stated tolerance and traceability, and a specialized setup that reaches larger bore gages but has limited depth capacity.
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Key Takeaways
- Accusize is the strongest general-purpose pick here because its AS-2 grade, serialized blocks, and certificate listing each block’s deviation provide a useful documented reference.
- TEXALAN offers a traceable 36-piece steel set with a stated ±0.000050-inch tolerance, though its economy grade may not fit the most demanding lab work.
- Fowler is the only option built around setting bore gages, with capacity up to 6 inches and a quick-release holder.
- A calibration certificate supports traceability, but buyers should confirm the certificate’s scope and suitability for their own quality system.
- The stated calibration temperature matters: Accusize is calibrated at 68°F (20°C), so temperature control helps avoid measurement differences.
| Accusize Industrial Tools 36 Pc Steel Gage Block Set, Grade AS-2, ASME B89.1.9-2002 |  | Best Overall for Documented General Shop Reference | Pieces: 36 | Standard: ASME B89.1.9-2002 | Grade: AS-2 | VIEW ON AMAZON | See Our Full Breakdown |
| TEXALAN 36-Piece Economy Grade Rectangular Gauge Block Set for Precision Calibration |  | Best Value for Traceable Everyday Setups | Pieces: 36 | Range: 0.050 to 4.000 in | Grade: Economy | VIEW ON AMAZON | See Our Full Breakdown |
| Fowler 53-646-000-1 Bore Gage Setting Master Kit, 36-Piece Set |  | Best for Setting Bore Gages | Bore gage diameter capacity: Up to 6 in | Depth capacity: 1 in | Setting accuracy: 0.0001 in | VIEW ON AMAZON | See Our Full Breakdown |
| gauge calibration kit | Certification | Pieces | Grade | Material |
|---|---|---|---|---|
| Accusize Industrial Tools 36 P | Inspection certificate with per-block deviations | 36 | AS-2 | Steel |
| TEXALAN 36-Piece Economy Grade | Traceable calibration certificate | 36 | Economy | Fully seasoned alloy tool steel |
| Fowler 53-646-000-1 Bore Gage | Certificate to N.I.S.T. | — | — | — |
More Details on Our Top Picks
Accusize Industrial Tools 36 Pc Steel Gage Block Set, Grade AS-2, ASME B89.1.9-2002
For a shop that needs a versatile reference set with documentation attached to the individual blocks, Accusize is my best overall pick. Its 36 steel blocks are specified to ASME B89.1.9-2002, Grade AS-2, and the certificate lists deviations for each block. That detail gives a user more to work with than a certificate that simply accompanies the set without per-block values. The fitted wooden case also helps keep the blocks organized and protected between setups.
Compared with TEXALAN, Accusize foregrounds its AS-2 grade and standards compliance, while TEXALAN spells out an economy tolerance of ±0.000050 inches and emphasizes its mirror-lapped surfaces. Buyers choosing between them should match the documentation to the procedure they need to follow rather than assuming one label answers every accuracy question. Accusize is hardened to HRC 64 and described as corrosion and defacement resistant, but even hardened steel blocks need careful handling and clean contact surfaces.
The main limitation is its stated reference temperature: 68°F (20°C). A shop with substantial temperature swings may not get the most consistent comparison results unless it manages the environment and allows the blocks to stabilize. TEXALAN gives a more explicit tolerance figure, while Accusize supplies the clearer stated grade and per-block deviations. I’d pick this set for general calibration support where documented block deviations matter, and skip it if the work requires a different temperature range or a specific laboratory grade not established by the supplied details.
Pros:- AS-2 grade and stated compliance with ASME B89.1.9-2002
- Certificate of inspection lists deviations for each block
- Hardened steel construction at HRC 64 with stated corrosion and defacement resistance
- Fitted wooden storage case
Cons:- Calibration reference is stated at 68°F (20°C), calling for temperature control or compensation
- The supplied details do not give a numerical tolerance for direct comparison with TEXALAN
Best for: Machinists and inspectors who want a general 36-piece steel reference set with AS-2 designation and per-block deviation documentation.
Not ideal for: Users who cannot control or account for temperature near 68°F (20°C), or whose procedures demand a specifically stated tolerance or grade beyond the supplied AS-2 information.
- Pieces:36
- Standard:ASME B89.1.9-2002
- Grade:AS-2
- Material:Steel
- Hardness:HRC 64
- Calibration temperature:68°F (20°C)
- Certification:Inspection certificate with per-block deviations
- Case:Fitted wooden case
Our verdict“I recommend Accusize as the most balanced general-purpose choice when AS-2 designation and block-by-block deviation records matter.”
TEXALAN 36-Piece Economy Grade Rectangular Gauge Block Set for Precision Calibration
TEXALAN is the practical value pick for buyers who want a broad block selection and a stated tolerance without moving to a more specialized bore setting system. Its 36 pieces cover 0.050 to 4.000 inches, and the stated economy grade tolerance is ±0.000050 inches. For routine machinist, inspection, and toolroom setups, that range and figure make the intended use easier to gauge than a vague claim of precision alone.
Its tool steel is hardened to 65 RC, and the mirror-lapped surfaces are intended to support wringing and stacking. Those are useful characteristics when combining blocks to build a reference length. Each block has a laser-marked serial number, and the set includes a traceable calibration certificate, which helps identify pieces and maintain records. Compared with Accusize, TEXALAN supplies an explicit tolerance and range, while Accusize’s certificate reports individual deviations and its stated AS-2 designation gives it a stronger documentation profile for buyers who prioritize that distinction.
The word economy matters here: the listed tolerance may be adequate for everyday shop work, but the product details caution that it may not suit the most demanding laboratory applications. It is also a general block set, so it lacks Fowler’s integrated holder and adjustable anvils for setting bore gages. I’d choose TEXALAN when a traceable, durable set with a clear working range is the priority. I’d pass if the procedure requires a more stringent grade, or if the main task is setting larger internal bores.
Pros:- 36-piece range from 0.050 to 4.000 inches
- Stated economy tolerance of ±0.000050 inches
- 65 RC seasoned tool steel with mirror-lapped surfaces for wringing
- Laser-marked serial numbers and traceable calibration certificate
Cons:- Economy grade may fall short of demanding laboratory requirements
- Does not include Fowler’s bore gage holder or adjustable anvil arrangement
- The listed range ends at 4.000 inches, below Fowler’s 6-inch bore capacity
Best for: Shop users who need a traceable, everyday gage block set spanning 0.050 to 4.000 inches and can work within its economy-grade tolerance.
Not ideal for: Laboratories or regulated applications requiring a higher specified grade, and users primarily setting bore gages who need a dedicated fixture.
- Pieces:36
- Range:0.050 to 4.000 in
- Grade:Economy
- Tolerance:±0.000050 in
- Material:Fully seasoned alloy tool steel
- Hardness:65 RC
- Certification:Traceable calibration certificate
- Dimensions:9.4 × 8.4 × 2.6 in
Our verdict“I’d choose TEXALAN for routine traceable block work when its economy tolerance and 4-inch range fit the job.”
Fowler 53-646-000-1 Bore Gage Setting Master Kit, 36-Piece Set
Fowler earns its place by solving a different calibration task from the two general block sets: it is designed to set bore gages up to 6 inches in diameter. The 36-piece block set comes with a quick-release holder and adjustable anvils, giving the kit a dedicated way to establish a setting for internal measurement. Its 0.0001-inch setting accuracy and certificate to N.I.S.T. make the stated purpose and documentation clear.
Compared with Accusize and TEXALAN, Fowler is less of an all-purpose reference set and more of a fixture-based system. Its blocks can support setting, and the kit can also be used for external setting with compatible measuring tools, but that extra use depends on the application. For someone measuring bores, the holder and 6-inch capacity are more directly useful than a stand-alone block set. For routine length references or broader gage block tasks, Accusize or TEXALAN may be a simpler match.
The largest constraint is depth capacity of 1 inch. A bore may be within the diameter range yet still fall outside the kit’s usable depth, so buyers should check both dimensions of their workpiece and the bore gage arrangement. Fowler lists block tolerance up to ±0.00005 inches, but its system has more setup-specific components than the other two picks. I’d choose it for bore gage work where the fixture matches the measuring task, and skip it if shallow depth is insufficient or a general-purpose block set is the actual need.
Pros:- Purpose-built to set bore gages up to 6 inches in diameter
- Quick-release holder and two adjustable anvils support setup changes
- Stated setting accuracy of 0.0001 inches and block tolerance up to ±0.00005 inches
- Includes aluminum case and calibration certificate to N.I.S.T.
Cons:- Depth capacity is limited to 1 inch
- External setting depends on compatibility with the measuring tool and application
- More specialized than the general block sets from Accusize and TEXALAN
Best for: Inspectors and machinists who routinely set bore gages up to 6 inches and can work within the kit’s 1-inch depth capacity.
Not ideal for: Buyers seeking a general-purpose gage block set, or anyone whose bore depth exceeds 1 inch or whose external setting application is not compatible.
- Bore gage diameter capacity:Up to 6 in
- Depth capacity:1 in
- Setting accuracy:0.0001 in
- Gage block tolerance:Up to ±0.00005 in
- Adjustable anvils:2; 2.375 × 0.375 in
- Centralizer capacity width:2.625 in
- Certification:Certificate to N.I.S.T.
- Case:Aluminum
Our verdict“I recommend Fowler when bore gage setting is the primary job and its diameter and depth capacities match the work.”
How We Picked
I ranked these options by how directly each one supports gauge calibration and setting, then by the evidence supplied about accuracy, traceability, usable range, and handling. A general gage block set can serve many comparison and setup tasks, but it does not automatically provide the fixture or geometry needed to set every kind of gauge. That distinction is why Fowler earns a specialized role despite its narrower use.
I gave weight to stated grade or tolerance, block material and finish, included certification, and practical details such as storage and adjustment. Accusize lists an AS-2 grade and a certificate with per-block deviations; TEXALAN specifies an economy tolerance and traceable certificate; Fowler pairs gage blocks with a bore gage setting fixture and a certificate to N.I.S.T. I treat those claims as product specifications, not as proof that a kit meets every buyer’s calibration procedure. Buyers should check whether the documentation and range match their instrument, standards, and quality requirements.
The order favors the best fit for broad shop use first, followed by a value-oriented general set, then the bore-specific system. The ranking is not a claim that a specialized kit is inferior; Fowler simply solves a more defined problem. Each recommendation has a meaningful limitation, including temperature sensitivity, economy-grade tolerance, or shallow depth capacity.
| gauge calibration kit | Grade | Material | Certification | Case |
|---|---|---|---|---|
| Accusize Industrial Tools 36 P | AS-2 | Steel | Inspection certificate with per-block deviations | Fitted wooden case |
| TEXALAN 36-Piece Economy Grade | Economy | Fully seasoned alloy tool steel | Traceable calibration certificate | — |
| Fowler 53-646-000-1 Bore Gage | — | — | Certificate to N.I.S.T. | Aluminum |
Factors to Consider When Choosing Gauge Calibration Kits
I’d start by identifying the gauge and measurement range the kit must support. Gage blocks serve as reference lengths, while a bore gage setting kit adds a fixture suited to establishing internal diameters. The right kit depends on both the measurement and the records your process requires.Match the kit to the gauge
For general dimensional checks, a stand-alone block set can provide reference lengths for comparisons and setups. If the main instrument is a bore gage, a dedicated holder and adjustable anvils can make the setting process more direct. Fowler is the only kit here designed around that job, with capacity up to 6 inches; its 1-inch depth limit still needs to fit the workpiece. The Accusize and TEXALAN sets are more flexible as block references but do not list Fowler’s bore setting fixture.
Read grade and tolerance together
A grade label and a numerical tolerance answer related but different questions. Accusize states AS-2 grade and ASME compliance, while TEXALAN lists an economy grade with ±0.000050-inch tolerance. Fowler lists block tolerance up to ±0.00005 inches and 0.0001-inch setting accuracy for its complete bore setting task. Compare the specific claim to the instrument and procedure you use; a tolerance figure alone does not establish that the whole setup meets your calibration requirement.
Check what the certificate documents
Documentation can make a kit easier to use in a quality process, but certificate types differ. Accusize includes per-block deviations, TEXALAN describes its certificate as traceable, and Fowler specifies a certificate to N.I.S.T. Before purchase, confirm that the certificate identifies the pieces and measurements your records require. If your organization needs a particular accreditation, uncertainty statement, or recalibration interval, verify those details with the seller rather than inferring them from the word “calibrated.”
Account for handling and temperature
Gauge blocks depend on clean, undamaged contact faces and careful handling. Mirror-lapped surfaces on TEXALAN are intended to support wringing; hardened steel and fitted storage on Accusize support durability and organization. Accusize states calibration at 68°F (20°C), so temperature differences can affect dimensional comparisons. Keep blocks clean, allow them to reach the work area’s temperature, and follow the handling and storage directions for the specific set.
Choose range before piece count
A 36-piece count does not tell you whether the available sizes suit your work. TEXALAN lists a 0.050 to 4.000-inch range, and Fowler’s fixture can set bore gages up to 6 inches in diameter. Accusize’s supplied details identify its count but do not list the size range, so confirm the included block sizes if your setups depend on particular dimensions. Choose by the combinations you need to build, the bore or gauge capacity, and the available depth, then use piece count as a secondary comparison.
Frequently Asked Questions
What is the difference between a gage block set and a bore gage setting kit?
A gage block set provides precision reference lengths that can be wrung together or used in measurement setups. A bore gage setting kit adds components intended to position or support the bore gage while establishing a reference diameter. In this group, Accusize and TEXALAN are general block sets, while Fowler includes a quick-release holder and adjustable anvils for bore gage setting.
Which kit is best for general shop calibration work?
Accusize is my leading general-purpose recommendation because it pairs an AS-2 designation with a certificate listing deviations for each block. TEXALAN may suit everyday work when its stated economy tolerance of ±0.000050 inches fits the procedure. The better choice depends on the grade and documentation your shop needs, plus whether the listed sizes cover your common setups.
Does a calibration certificate guarantee the kit fits my quality system?
No certificate label by itself establishes suitability for every quality system. Accusize lists per-block deviations, TEXALAN describes a traceable certificate, and Fowler specifies a certificate to N.I.S.T. Buyers should confirm the certificate’s contents, traceability, scope, and any accreditation or uncertainty requirements their procedures specify.
Why does calibration temperature matter for gauge blocks?
Gauge block dimensions can vary with temperature, so a reference measured in a different thermal condition may not produce the same comparison result. Accusize states calibration at 68°F (20°C), making temperature stabilization especially relevant when using that set. Let blocks and the work area reach a stable temperature and follow the maker’s guidance for the task.
When should I choose Fowler over Accusize or TEXALAN?
Choose Fowler when setting bore gages is the central need and its capacity of up to 6 inches in diameter and 1 inch in depth matches the job. Its holder and adjustable anvils serve that task directly, while Accusize and TEXALAN are more straightforward as general block sets. For routine reference lengths or work requiring a broader block range, compare the listed sizes and documentation of the general sets instead.
Conclusion
For general documented shop reference, I’d start with Accusize because its AS-2 designation and per-block deviations make its documentation especially useful. For traceable everyday setups where an economy-grade tolerance is acceptable, TEXALAN gives a clear 0.050 to 4.000-inch range. For bore gage setting, Fowler is the purpose-built choice, provided the 1-inch depth capacity is enough. Match the kit’s grade, range, certificate, and temperature conditions to your actual procedure before choosing.
