Fastener holders in combination with washers, short bolt adapters, and nut proof loading assemblies allow you to perform static tensile testing of external or internal threaded fasteners. The fastener holder sets are capable of axial and wedge proof loading, tensile testing, and nut proof load testing in accordance with ASTM F606.

How to Construct the Load String

Fastener Holders


Fastener Holders

Fastener holders are the main component for performing fastener testing. These fixtures are threaded on the adapting end to mount easily to either spherically seated tension rods or other adapters. Each fastener holder has a key slot that allows the operator to quickly and correctly load the specimen. A recessed circular area in the bottom of each fastener holder ensures that the washer will fit snugly. This reduces loading time and occurrences of slippage, because a secure, centered seating is ensured for each test.

Available Models
Description Rated Capacity Maximum Specimen Diameter Adapting Thread Size Catalog No.
Series A Fastener Holders, Type Dm 100 kN M12 Upper and Lower Fitting: Type Dm W-5115M-A
Series A Fastener Holders 150 kN M12 M36 (Type R4) Female W-5155-A
Series B Fastener Holders 600 kN M24 M48 (Type II RH) Female W-5155-B
Series C Fastener Holders 1000 kN M72 M72 (Type IIA RH) Female W-5155-C
Series D Fastener Holders 1500 kN M48 M72 (Type IIA RH) Female W-5155-D
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Washers for Fastener Holders


Washers for Fastener Holders

Designed as an integral part of the fastener testing system, washers provide the interface between the specimen and the fastener holders. All washers are designed to conform to ASTM F606 standards, in thickness, width, and hardness. Each washer is engineered to fit a specific bolt holder, so they will seat snugly and securely in the recessed portion of the bolt holder. Numerous diameters and thread/pitch sizes are available, and washers can be engineered to meet customer specifications for an exact fit. All washers comply with ASTM F606, SAE J429, and ISO 898.*

* Contact Instron for specific fixtures to comply with ISO 898

Available Models
Description Compatible Holder Series Specimen Diameter Catalog No.
Plain Flat Washers Series A
Series B
Series C
Series D
0 to 12 mm
0 to 24 mm
0 to 36 mm
6 to 48 mm
W-5120-A
W-5120-B
W-5120-C
W-5120-D
10° Plain Wedge Washers Series A
Series B
Series C
Series D
0 to 12 mm
0 to 24 mm
0 to 36 mm
0 to 48 mm
W-5121-A
W-5121-B
W-5121-C
W-5121-D
6° Plain Wedge Washers Series A
Series B
Series C
Series D
0 to 12 mm
0 to 24 mm
0 to 36 mm
0 to 48 mm
W-5122-A
W-5122-B
W-5122-C
W-5122-D
4° Plain Wedge Washers Series A
Series B
Series C
Series D
0 to 12 mm
0 to 24 mm
0 to 36 mm
0 to 48 mm
W-5123-A
W-5123-B
W-5123-C
W-5123-D
Countersunk Flat Washer to Test 60° Series A
Series B
Series C
0 to 12 mm
0 to 24 mm
0 to 36 mm
W-5139-A
W-5139-B
W-5139-C
Countersunk Flat Washer to Test 82° Series A
Series B
Series C
0 to 12 mm
0 to 24 mm
0 to 36 mm
W-5138-A
W-5138-B
W-5138-C
Countersunk Flat Washer to Test 100° Series A
Series B
Series C
0 to 12 mm
0 to 24 mm
0 to 36 mm
W-5137-A
W-5137-B
W-5137-C
Threaded Flat Washers Series A
Series B
Series C
Series D
0 to 12 mm
0 to 24 mm
0 to 36 mm
0 to 48 mm
W-5144-A
W-5144-B
W-5144-C
W-5144-D
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Short Bolt Adapters for Fastener Holders


Short Bolt Adapters

Short bolt adapters are used for bolts that are too short to be tested in bolt holders using conventional threaded washers. These adapters are available for all bolt holder series. There are two different types of short bolt adapters: tophat adapters for smaller diameter bolts and dumbbell adapters for larger diameter bolts. The tophat adapters can generally be used on shorter bolts because a section of the adapter actually fits into the holder. If the bolt diameter requires a heavy-duty adapter with thread attachment external to the bolt holders, a dumbbell adapter would be used. All adapters are designed to conform to ASTM F606 and other international standards.

Available Models
Description Compatible Holder Series Specimen Diameter Catalog No.
Tophat Style Adapters Series A
Series B
Series C
Series D
0 to 6 mm
0 to 12 mm
0 to 18 mm
6 to 24 mm
W-5131-A
W-5131-B
W-5131-C
W-5131-D
Dumbbell Style Adapters Series A
Series B
Series C
Series D
6 to 12 mm
12 to 24 mm
18 to 36 mm
24 to 48 mm
W-5132-A
W-5132-B
W-5132-C
W-5132-D
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Nut Proof Loading Assembly


Nut Proof Loading Assemblies for Holders

Nut proof loading assemblies are designed for proof loading or cone stripping of threaded nuts. They are designed to be used in conjunction with fastener holders and are available for all of the fastener holders series. Nut proof loading assemblies consist of a hardened proof loading mandrel and a proof loading plain flat washer. When used to perform cone stripping tests, an additional conically shaped plain washer must be used.

Available Models
Compatible Holder Series Available Thread Size Range Catalog No.
Series A M3 to M12 W-5133-A
Series B M3 to M24 W-5133-B
Series C M3 to M36 W-5133-C
Series D M3 to M45 W-5133-D
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Reducing Rod


Reducing Rods

Fastener reducing rod assemblies are used as an adapter to allow smaller size fastener holders to be mounted to larger bolt holders. The reducing rod assembly consists of a threaded rod and a plain flat washer that matches the larger fastener holder being used.

Available Models
Description Catalog No.
Adapters for Attaching Series B to Series C or D Fastener Holders W-5119-B
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