Quantcast BOLT IDENTIFICATION CHART - TM-55-1905-220-14-40026

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TM 55-1905-220-14-4
BOLT IDENTIFICATION CHART
Grade identification markings are normally stamped on the heads of the bolts.
To aid
identification of the various bolts used in Detroit Diesel engines, refer to the following chart.
Nominal Size
Grade
Identification
GM Number
SAE
Grade
Diameter
Tensile
Strength
Marking on Bolt Head
Designation
(inch)
Min. (psi)
None
GM 255-M
1
No. 6 thru 1-1/2
60,000
None
GM 260-M
2
No. 6 thru
74,000
over 3/4 to 1-1/2
Bolts and Screws
GM 280-M
5
No. 6 thru 1
120,000
over 1 to 1-1/12
105,000
Hex Head Sems Only
GM 275-M
5.1
No. 6 thru 3/8
120,000
Bolts and Screws
GM 290-M
7
thru 1-1/2
133,000
Bolts and Screws
GM 300-M
8
thru 1-1/2
150,000
Bolts and Screws
GM 455-M
None
No. 6 thru 1-1/2
55,000
3-263


 


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